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RADC-TDR- 64.373, Vol i(• Final Report
ANALYSIS OF MAINTENANCE TASK TIME DATA
(Covering Electrical, Electronic and Electro-mechanical
Components during Weapon System Operational Phase)
_- r hýY t $. ......
TECHNICAL DOCUMENTARY REPORT NO. RADC-TDR-64-373
December 1964
Reliability BranchRome Air Development Center
Research and Technology DivisionAir Force Systems Command "
Griffiss Air Force Base, New York
Project No. 5519, Task No. 551901
(Prepared under Contract AF 30(602)-3229 by Chrysler Corpýiation MissileDivision, Warren, Michigan.)
ILfr~fW~
US Govemmant drxwiaos. apecif~etations, or' "er data ar-, used for any purpose othet
A dt-iftMIY telated governwe~nt procurement operation, the gov~ernm~ent thereby incurs
no repqfwsibility rnox w1sy o4i11grtion whaws-cver; aasi the fact chat the govei-nmen, zmay ýa it
fozrmulated, hxnilisbe& *r ;a any way suppiied ,the said drawi-irs, specifications, or other
date. is not to be regaryi--d ýjy im-Picatkuz or otherwise, vs in any manner iictnsing the hol~cFe
or "nY othe'- mfr5ýO of corporation, or c-.ei~any Vights or permission to atanuiacture, Ub~e,
or setl 4ny piizented inyvai.oait :hat m~y in ~iy Wuy t~ rei~ted thev-.-zo
Q-Jalified rejoetieaez may obtain co-tdes from Defense Docinncatadior Ccnte-r.
Dd-feUsC D'3,cuMInetionM Ceatter rt kase to Office of T-echlaical Services ia aiithurir-td.
Doaa xe-4rn twi c~or.p aca.- o. &destroy.
FOREAORD
This report was prepared by Chrysltr Corporation Missile
Division wider Air Force Contract AF 30(602)-3229, "Analysis
of Maintenance Task Time Data. " The work was admimstered
under the direction of the Rciability Branch, Engineering Divi-
sion, Rome Air D, ;elopment Center %ith Mr. Frank Mazzola
as Project Engineer.
The study and investigation was performed by the Support Sys-
terrs Engineering Department of Field Operations, Chrysler
Corporation Missile Division.
This report covers the perio)d from 27 October 1963 to 29 July
1964 on Contract No. AF 30(602)-3229.
AIR FORCE. OAF&. N. V.. 29 JAN 43-120
4 - _ _ _ _ _
ABSTRACT
rhis s!?-idy and investigation was undertaken to develop maintenance task time
data for electrical, electronic and electromeehanical component/replaceable
items of a ballistic missile weapon system. Maintenance task time data were
researched from unscheduled maintenance actions recorded in the field, during
the operational phase of the JUPITER Weapon System (WS-.15A2) covering a
period of three years.
Statistical information was ccmputed as minimum-time-to-repair, maximum-
time-to-repair and mean-time--to-repair (MTTR) data tor individua! compo-
nents Thfse statistics were correlated %ith component identificationboth by
functin and Federal Stock Number.
Active maintenance times were tabulated on alphabetical nomenclature listings
of component/replaceable items grouped by:
(1) A Weapon System Summary denoting overall system experience.
(2) An End Item Summary denoting specific applicatiebns within equip-
ments.
The active maintenance times were identified in these listings as to minimum,
mean, a~A maximum -time-to-repair levels. Component ancillary maintenance
data were also tabulated on alphabetical nomenclature listings as a Component/
Replaceable Item Summary with end item grouping.
These tabulated maintenance task time vaiaes and data can be uilized in
technical/management appraisals and plan:,ng for the engineering of new weapon
systems and equipment.,
lii
PUBLICATION REVIEW
This report has tbeen reviewed and is approved. For further technical information onthis project, contact Mr. Frank D. Mazzola, EMERR, Ext 5186
FRANK D. MAZZOIAReliability Engineering SectionReliability Branch
Approvo~~
h neeringDivision
F3R THE COMMANDER:
Chief. A venced'Stwdies Group
iv
"Evaluation
The objective of tids study u-s to evaluate techn±cal maintenar-ce reportsf~or unscheduled maiintenwiict COA _J___e _ --. 44-'l*w .o~
order to dete-rnine the minimum, mean and me-ximum time to repair componentsand line replaceable items. The data reported is representative of mainte-nance times vhich car. be expected tc occur in the actual operational mainte-nance environment.
The study resulted in the identification of' four himdred and seventy-five (475) electrical, electroric ane electromechanical. items and eighthundred and twenty (820) mechanical items for which data has been recorded.T.his data includes the time to perform maintenance and the type of mainte-nance performed. Complete identification of the items by Federal StockNumbler, Vendor and Vendor Part Number is also furnisbed.
The value of thiis data lins in its potential application. Knowledge ofmaintenance times 'will enhance prediction of maintainability during design.Ilt will also assist in the d4vclop-ment of the total maintensnce plan in-cluding more efficicnt allocation of resources, establishment of sparerequirements and training needs. Complete identification of the itemsprovides a reference for additional data on similar or identical items and,in addi ion, permits the identification of items which require the greatest•aintenance times.
This contractual effort represents the first major effort to developmean-time-to-repair statistics based upon documented maintenance tasks. Itrepresents an initial step tomards the development of a Maintainabililty DataBank.
This infoma.tion vill be made available to government agencies and con-tractors engaged im the design of mil- -ary eqaipment to assist in the 7ore-dictinr. of maintainabi-ity and in establishing quantitative maintainabilityrequirementes. Bt adding to this data, through in-the-house and contrartualefforts, a high degree of confidence can be attained in the use of thes%.statistics.
FRANK D. MAZZOIAReliabilityEngineering Section
Reliability Branch
V
TABLE OF CONTENTS
Section Page
1.0 LNTRODUCTION 1
2.0 SUMMARY 3
3.0 sT'UDY AND INVESTIGATION DISCUSSION 43.1 Task I - Data Retrieval 43.2 Task II - WOTR (Data Source) Analysis 43.3 Task III - MTTR Development and Presentation 9
4.0 ACTIVE MAINTENANCE TIME DISCUTSSION 144.1 Maintenance Task Time Data Sources 144.2 Analysis Guidelines 154.3 Active Maintenance Time Values 17
4.4 Ancillary Maintenance Data 184.5 Data Application Comments 19
- CONCLUSIONS AND RECOMMENDATIONS 215.1 Conclusions 215. 2 Recommendations 21
APPENDICES
I Weapon System Summary (Component Active Main'enance 23
Times)
II Major End Item Identification 54
III End Item Summary (Component Active Maintenance Tines) 60
lV Component/Replaceable Item Summary (Component AncillaryMaintenance Data) 133
V Action Taken Codes 219
VI Weapon System Maintenance Philosophy 224
VII Maintenance Definitions 227
VIII Manufacturers Federal Supply Code 229
vii
1.0 INTIRODUCTION
Air I.orce maintenance phiiosophy encompasses the principi,- of periodic bchc_-d-
uied in3pections, pre ventive maintenance tabks, unbinuucullud -uaintenance tasks
hnd mandatory replacement of specified subassemblies at predeterniined inter-
vals. These u.aintenance actions are accomplished at organizational, field, and
depot levels according to the complexity, skill level and equipment requirements
for each task. Unscheduled maintenance is performed on an as-required basis.
With weapon systems becoming more complex, the system's maintainal ility
characteristics are increasing as a significant factor toward determining weapon
systems effectiveness. Historically, a maintenance analysis is performed on
each weapon system and includes the prediction of remove and replace times for
parts, components and subassemblies. These remove and replace times are
based on best engineering judgemnent as a result of an evaluation for complexity,
accessibility, tools and test equipment requirements. The maintenance analy-
sis is the initial bsep in specifying maintainability in quantitative terms.
With the establi-hment of maintainability as a design pararietei. quantitative
techniques are required for specifying, predicting and measuring maintain-
ability. By the use of known maintenance times for parts, components and sub-
assemblies, maintainability characteristics can be more accurately evaluated
during the conceptual and delinition phases. Where maintainability require-
ments are not met, design action can be implemented early enough in the pro-
gram t minimize costly maintenance requirements during the operational
phase. Also, by the use of quantitative maintainability values, the impact of
,changes can be evaluated for optimizing system design.
At the present time the application of qu:-ntitative maintainability values is
limited by the avairability of rea-istic mean-time-to-repair statistics. This
1 -
study, "Analysis of Maintenance Task Time Data," is an initial step in the de-
velopment of mean-time-to-repair statistics based on documented mainte-
nance actions from a complete weapon system in its operational phase. The
resulting statistics provide accurate values tor computing time-to-repair in
the design and development of new weapon systems. These statistics also
provide management with documented quantified experience for developing the
maintenance plans of new systems and equipment.
2.0 SUMMARY
The objective of this project was to produce realistic repair times for mainte-
nance events of a fielded weapon system.
The original scope of work was confined to maintenance task time data on elec-
trical, electronic, and electromechanical components of the system.
The informational souice comprised twenty thousand (20,000) Work Order
Technical Reports (\W'OTRsR generated in the field. These reports were based
on unscheduled maintenance actions representing those occurring during the
operational phase of the JUPITER Baliistic Missile Weapon System.
This project was accomplished by the folloing three major task areas:
Task I: Data Retrieval
Task II: WOTR (Data Source) Analysis
Task HI: MTTR Development and Presentation
Mean-time-to-repair (MTTR) values were computed and tabulated along with
minimum and maximum values for each level of naintenance. Ancillary mainte-
nance data were also retrieved, correlated and tabul--t d.
Component active maintenance timqs are tabulated ii. Appendix I, Weapon Sys-
tem Summary, and Appendix I1I, End Item Summary. Component ancillary
maintenance data are presented in Appendix IV, Component/Replaceable Item
Summary.
3.0 STT. DY AND INVESTIGATION DISCUSSION
This study and investigation was accomplished in three parts, each identified as
a specific task: (Figure 1)
Task I - Data Retrieval
Task II - WOTR (Data Source) Analysis
Task III - MTTR Development and Presentation
3. Task I - Data Retrieval
Task I activities included the research, selection, classification and grouping of
Work Order Technical Reports (WOTRs) pertinent to this project. WOTRs con-
taining unscheduled maintenance information on this fielded weapon system equip-
ment were researched and selected from the Field Data Center. Selected WOTRs,
twenty thousand (20,000) in number, were classified and grouped according to
.heir end item application in this weapon system. Each group represented one
end item in this weapon system of which there were one hundred ninety-one (191)
end items.
Correlation of each WOTR to its end item application was made through the re-
corded figure A number or nomenclature. In those cases where further research
was necessary to determine end item identification, component part number, part
nomenclature and/or task description were used.
3.2 Task II - WOTR (Data Source) Analysis
Each Work Order Technical Report (WOTR) was screened and evaluated for main-
tenance information pertinent to electrical, electronic and electromechanical com-
ponents. Ths analysis produced twenty-five hundred (2500) WOTRs containing
component maintenance information pertinent to this project. The remaining
4
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seventeen thousand fivt hundred (17,500) WOTRs were returned to the Field Data
Center A!, not containing maintenance information pertinent to this study and in
vestigation. The seventeen thousand five hundred (17,500) WOTRs contained
maintenance informati )n on mechanical components, site facilities and equip-
ment modifications.
Further evaluation of the pertinent twenty-five hundred (2500) WOTRs resulted in
identifying thirteen hundred thirty-four (13341 WOTRs having usable data and
eleven hundred sixty-six t1166) WOTRs as not being usable.
Eleven hundred sixty-six (1166) reports were analyzed as not being usable for one
or more of the following reasons:
"* Lack of maintenance task time hours
"* Lack of component/replaceable item identification
"* Inadequate maintenance task description
"* Multiple tasks performed unde, one work order without detailed manhour
identification for each task
"* Fabrication of miscellaneous items
"* Installation of engineering modifications
The analysis and evaluation of thirteen handred thirty-four (1334) usable WOTRs
required, in some cases, extensive research of correlating data from engineering
configuration records. To facilitate the engineering analysis and evaluation of
these WOTRs, "Component/Replaceable Item Worksheets" were prepared. In the
process of preparing "Component/Replaceable Item Worksheets, " some WOTRs
wer(: set a-ide as requring further identification or clarification of maintenance
information. These set aside WOTRs, required either vendor part number or
ordnance number, necessitating a great deal of identification research to obtain
tlis information.
Of the thirteen hundred thirty-four (1334) reports with usable data, five hundred
thirty-tv-o .107'1 were for maintenance actions with one report, one hundred
6
nineýteen i9 with two r,,norts. fLftv-five W4I with three reports, twenty-live (2•
with four reports and the balance rangec, from five to twenty reports per ma....e-
nance action. (A maintenance action is defined as one task performed on a spe-
cific item.)
To proceed with the quantification of mairtenance task tinge data the following com-
ponent data were retrievcd from the WOTRs:
End Item Us(, in -
"* Nomenclature
"• Federal Stock Number (FSN,
"* System Use (OGE, MGE or AVE)
Component/Replaceable Item -
"* Nomenclature
"* Federal Stock Number ,FSN,
"* Vendor Part Numrner
"* Federal Supply Code foe Manufacturer
Repair Time Data -
"* Type of Failure
"* Action Taken Code (Code letter for Repair Work Performed)
"* Time (manhours) to Accomdlish Repair (at Organization, Field or
Depot Level
"* Time (manhours) to Diagnose Failure
"* Operating Time khours, Prior to Failure
The above data was compiled on "Component Pep acea' 'e Item Worksheets" for
computation of acti.,e maintenance times. In those cases where WVOTRs con-
tained time t¢, repa.r information but did not contain complete component identi-
fication further research of additional data s.turces was necessary. These re-
search references included:
"* Technical Orders
"* Illustrated Parts Breakdowns
74
* Parts Lists
0 Weapon System Equipment Lists
0 Blueprint Microfilm Files
e Federal Supply Codes Catalogs
* Federal Stock Catalogs
9 Vendor Catalogs
The "Remarks" column was intended for use in recording "Time to Diagnose
Failure" and "Operating Time Prior to Failure. " However, these data were not
available ju the anticipated quantities with the result tbhi" there was data for only
one entry as "Operating Time Prior to Failure."
Approximately twenty percent (20) of the pertinent WOTRI contained a Federal
Stock Number (FSN' However, several FSNs reported contained numerical errors,
thus requiring verification of each one as well as intensive records search to
establish accurate FSNs.
FSNs missing from WOTRs had not been assigned tc rmany components at the time
maintenance reports were prepared. Many component-,ý and end items were new
and peculiar to this weapon system, therefore, FSN proccssifig and number assign-
ment had nct kept pace with. development and fielding of the weapon system.
Detailed information concerning "Time to Diagnose Failure" was in general not
reported as a separate element on WOTRs. The time to perform diagnosis,
however, was included in the total maintenance time reported. The WOTR required
only the manhours to effect a repair, which included post-test and checkout time,
fault solation, and time to diagnose failure.
Cine of three levels of maintenance (organizational, field or depot) was determined
for each WOTR. Each WOTR, however, reported only the geographical location
used as a work area for performance of each maintenance task. These geographical
8
work areas included Mi!,-ie ...... aif ... nw-.... Shop. (MAMS•nl and ,ach
Y i ii LiilUflCI, rV 1LVS I 1£i- ' ri. it) Lta.A.1. ,b.'. ,. ,,l.t.-|A P ... .. ... . . ..
compatible Niiith Air Force maintenance management, each report was analyzed
to establish organizational, field or depot as the levý:i of maintenance perform-
ance. This was accomplished by detailed analysis of each task performed and
the subassembly affected. This information, in conjunction with the mainte-
nance philosophy, maintenance definitions and maintenance analysis experience
permitted t.le establishment of the proper level of maintenance.
Several component/replaceable items had maintenance performed at two or three
levels of maintenance. This is attributed to the various types of corrective main-
tenance actions performed, for example, simple adjustment at organizational
level, bench repair at field level or major repair or overhaul at depot level.
This fact becomes evident in examining the Component/Replaceable Item Summary
where there are sex eral reports for a component, each with a different action
taken code depicting the repair work performed.
Removal and replacement of a component at organizational le':el wou.]- often re-
sult in a reoair action at field or depot level, resulting in at least two reportable
tasks at different maintenance levels. Additionally, it there were a lack of spares
to satisfy remove/replace actions, major repair work -.-.s accomplished at the
organizational level and reported accordingly.
3.3 Task III - MTTR Development and Prý,sentation
Component/Replaceable Item Worksheets, prepared from .Pirteen hundred thirt"-
four (1334, usable WOTRs, formed the basis of MTTR axad ancillary maintenance
data development. The elements of maintenance reformation, contained on work-
sheets, were used to identify, compute and correlate MTTR and anci'iar. main-
tenance data.
9
These developed maintenance data were jbrepared in three separate summaries
to facilitate their use. These summaries are identified as -
0 Component/Replaceable Item Summary
* End Item Summar,
0 Weapon System Summary
A description of each summary is contained in tWe following paragraphs.
3..3.1 Component/Replaceable Item Summary
This summary, Appendix IV, is arranged by end item identification in alphabetical
sequence. See Appendix II lor end item identification. Average repair times for
specific types of work performed (Action Taken Code) are established and listed
without identifying the level of maintenance. These average repair times are of
value to an equipment designer and maintainability engineer in identifying those
maintenance tasks requiring relatively large expendtures of manhoirs. Com-
ponent selection and possible alternate designs can be made early enough to, pre-
vent costly modification or excessive maintenance. WThere remove and replace
times appear excessive, the designer would be alerted to design techniques for
reducing task times, either by application of modular concepts or simplification
of installation.
The developed repair times and "Action Taken Codes- can contribute significantly
to the maintenance management planning of wearpon systems.
Frequency of repair actions, as indicated by number or reports, serve as a basis
for developing such maintenance criteria as periodic inspections and replacement
schedules, required repair facilities and personnel, and level at which to ac-
complish (organizationai, field or depot).
10
Average repair times are an adjunct to maintenance management planning for
reducton of equipment downtime, repair or discard criteria and maintenance
scheduling.
This summary contains ancillary maintenance data for five hundred forty-four
(544) component/replaceable items.
3.3.2 End Item Summary
The "End Item Summary, " Appendix III, is arranged in an alphabetical end item
sequence. Within each end item, the components are also listed alphabetically.
This summary reflects the maintenance impact of each component on the end
item maintenance requirements. Idertification of maintenance requirements
are further made for level of maintenance and range of repair times. The Work
Order Technical Reports, used as the data source in this effort, represent a
broad scope of realistic maintenance experience.
In some instances, repair times for a particular maintenance task were higher
at organizational level than at field level The higher repair times indicate in-
adequate facilities and test equipment at that work area to perform that particular
maintenance task.
In the design and development stages of a new weapon system, the end item
summary of component repair times would be a significant reference source
in part selection for optimum maintainability. They would also be of value during
the maintenance analysis phase for establishing level of repair, manhour require-
ments, manning levels, repair or discard criteria, as well as other required
factors of maintenance management planning
11
This summary contains active maintenance times for five hundred forty-four
(544) component/replaceable items.
3. 3. 3 Weapon System Summary
The "Weapon System Summary," Appendix I, is arranged alphabetically by
component. This summary combines all applications of identical components
in one listing. MTTR and ancillary maintenance data presented in this summary
represent the impact of each component on the weapon system, and thus is realistic
when utilized in Quantitative systems maintainability analyses.
Where the difference between minimum and maxrimum component repair time is
small, the MTTR represents a well established maintenance task. Where time
spread is small and MTTR is heavily concentrated toward a minimum or maxi-
mum value and a larger number of reports have been recorded about the con-
centrated end, there is a definite indication of at least one abnormal or unusual
repair action. If, at organization or field level the spread is large and the MTTR
is approxiimately an average of the extremes, it could be an indication that this
is not an optimum level of repair, and should be accomplished at the next higher
level where greater skills and equipment are available. Problems contributing
to this may be lack of personnel training or motivation, available spares, facilities
or transportation. This is felt to be apparent in instances where organizational
or field or depot level times are significantly different.
The maintenance task time data developed as a result of this study are valid and
realistic, since it was based on actual maintenance experience of a fielded weapon
system.
12
A study to include all operational life data would create a greater depth of in-
formation and enhance the value of MTTR statistics in both the quantification of
maintainability criteria and maintenance management planning.
This st.mmary contains active maintenance times for four hundred seventy-five
(475.1 component/replaceable items. (Note: This difference in component
statL'stics is due to multiple application of identical components at the system
level.
13
4.0 ACTIVE MAINTENANCE TIME DISCUSSION
4. 1 Maintenance Task Time Data Sources
The basic data source for this study consisted of Chrysler-developed Work Order
Technica; Reports (WOTRs) which were employed both to manage maintenance and
to satisfy a technical reporting requirement of contractor management. These re-
ports provided maintenance action information, manhours actually required to
accomplish maintenance actions, an'i sufficient ident;Fication to pinpoint hardware to
the co-mponent/replaceable item level. The WOTR's supporting this study and in-
veti.gation were generated in several geographic locations for deployed ballistic
missile systems.
The "Time to Accomplish Repair" recorded on the V. oTR was the actual time (in
manhours) expended to accomplish the maintenance ta-sks. The maintenance task
times reported, in general, did not include separate identification of fault isolation
time, diagnostic time, repair time and checkout timc. However, the overall timEs
as reported included the time for these maintenance actions.
"Operating Time Prior to Failure" was genera'ly not recorded on the WOTRs.
Operating t'mes should have been recorded on "Missile System Status Records",
AFTO Form 2, but these records are not in the contractor's Field Data Center.
The general absence of elapsed time meters and lack of provisions to measure and
document operating times of deployed equipment continues to restrict the availability
of raw data necessary for maintainability and reliability purposes.
14
4. 2 Analysis Guidelines
Only those WOTRs reporting expended maintenanoe task times for electrical,
electronic, and electro-mechanical components were segregated for evaluationt.
All WOTRs reporting manhour estimates for performance of maintenance tasks
were excluded from this study. Only WOTRs reportirg actual manhour expendi-
tures were employed. While this criterion, i.e., exclusion of estimates, further
restricted the number of valid raw data reports, it was believed necessary to
Lake this approach in the interest of quantifying only actual experience.
Many WOTRs were also excluded because they reported a variety of tasks per-
formed under on,- work order without detailed manhour identification for each
task. Here again, it was believed that exclusion of these data was preferred
rather than arbit, •ry allocations of th• total t mes reported %hich could result
in artificial situations open to challenge.
The JUPITER Weapor. System had a configuration of one hundred ninety-one (191)
end items. The weapon system was subjected to a wide range of:
(1) Environmental Conditions
(2) Storage Conditions
(3) Transportation Modes
Other significant factors contributing to the generation of the WOTRs is the in-
fluence of a number of variables such as:
(1) Personnel Capability and Motivation
(2) Equipment Complexity
(3) Support Facilities
(4) Geographic Location
The scope of this study and investigation, as well as the availability of raw data,
resulted in maintenance time data for components in forty-three (43) of these end
15
items as identified in Appendix II. Those end items not falling within the scope
of this study included end items of a purely mechanical nature as well as plat-
forms, hoists, trailers, tractors and similar wea.pon system equipments.
Consideration was given to the determinatior of an MTTR for each major end
item for which component MTTR data had been developed. Investigation of this
matter resulted Lt. the conclusion that a realistic MTTR could be developed for an
end item, but that there would be additional data requirements beyond those pre-
sently available for electrical, electronic and electro-mechaaical components.
These would include additional corrective maintenance data, such as : MTTR
for mechanical components, interface and subsystems analyses and definitions,
and preventive maintenance task time when resulting in downtime. A greater
depth and scope of data than are presently available would be required in order
to arrive at meaningful MTTR statistics for major end items. Based on these
findings, MTTR data for end items are not presented in this report.
Maintenance personnel, organized as mobile maintenance teams, in many in-
stancef performed all levels of maintenance. In those cases where WOTRs did
not clearly identify the level at which the maintenance action was performed
(organizational, field or depot), mainitenanne engineering knowledge of the sys-
tem was utilized to identify the proper maintenance level.
16
4. 3 Active Maintenance Time Values
Each nP,-intenance action time, as reported on a WOTR, was recorded
against the appropriate component/replaceable item and identified with a
level of maintenance. Mean-time-to-repair (MTTR) values were computed
by surnming the individual maintenance action times and dividing this total
by the total number of maintenance actions, all of which occurred during the
same period of calendar time, and within the same level of maintenance.
Minimum and maximum times were established by selecting the minimum
and maximum times reported and appearing on the listings of individual
maintenance actions. Where only one repair time was listed for a component,
this time was recorded as the presently established value for minimum and max-
imumi, as well as the mean-time-to-repair.
The number of items with only one reported maintenance action is the result of
many influencing factors. The corrective maintenance reports providing the
raw data fo'" this study were generated by random failures. Improved preven-
tive maintenance measures and "field fixes" precluded re-occurrence of some of
these failures. High inherent reliability co,,tributed significantly to only one
reported failure of some items. Also, operation of a component below its Jesign
stress levels extended its useful life, reduced the failure rate, and resulted in
fewer or no requirements for corrective maintenance.
17
4. 1 Ancidlary Maintenance Data
The code letters depicting the repair work performed, used in Appendix IV
herein aad listed in Appendix V herein, were taken from paragraph 9. 14 of
AFM 66-1, "Maintenance Management for Depot, Field and Organization. "
Although the action taken codes are listed primarily against individual com-
ponents, there are instances where they are not directly applicalu'le to that
component and the next upper assembly must be considered as to its in-
tluence on the maintenance action. (Note that this is also a consideration
for the maintenance time values in tne case of a nonrepairable ite-, such
as a resistor or capacitor, where the maintenance action involvred the as-
sembly, but could be attributed to a part failure.)
Based on action taken codes (repair work performed), the following re-
sults were noted:
No. ofAction Taken Code Reports Percent
R - Remove and Replace 725 54
A - Bench Check and Repair 245 is
L - Adjust 74 5.5
G - Repair/Replacement of Attaching Units 65 4.9
F - Repair (includes calibration if needed) 65 4.9
Q - Installed 40 3
K - Calibrated (no repair) 32 2.4
B - Bench Checked - Serviheable 29 2..2
U - Replace after Cannibalization 22 1.6
C - NRTS (Na)t Reparable this Station) 15 1.1
E - Equipment Checked -- no repair required 12 0.9
X- Test, Inspect, Service 6 -
Y - Troubleshoot 5
T - Removed for Cannibalization 2 -9
X - Paint 2
P - Removed 118
It is siwrtwa,:t to ro!e that remnuve and replace actions faction "iken cede - H)
corot sso the major effort (54'- of maintenance tasks pertormed.
"Bench Check and Repair, Code A, was next in order of significance (18).
Analysis ou' this data would serve as a basis for establishing repair or discard
criteria lor various items, as well as aid mn maintainability and logistic plan-
ning.
Code L - Adjust, was third in frequency of occurrence. Although scattered
throughout the system, they do point out the need for maintenance actions
and further maintenance analysis could result in reduction or elimination of
some of these actions.
The balance of the coded - ..tions classify the remaiii.ng maintenance actions
and utilization of repair times of each could be of value in maintenance
management planning.
i. 5 Data Applica:ion Comments
During preliminary analysis and design of new weapon systems, a quantitative
maintenance analysis must be performed initially at the system level. Per-
forrnance of a quantitative maintenance analysis at the system level must be
based on the quantitative characteristics of those individual components pro-
posed for each design. When these components or similar function components
are applied to new weapon systems designs, their known maintenance task time
values (quantitative characteristics) provide the means for quantitative mainte-
nance analysis of the proposed design.
19
• m~ • •Nw • • wmm mwnw • •• m~wa ••~w
The task times indicated form a basis for determining total down-time effect
of the particular actions. The majo-ity t•pai-" appear reasonable.
For those that seem excessive, a designc ,i. utili-in6 .he data would b,;
alerted to seeking a substitute and a maintenance analyst would possibly
recommend the task be performed at a higher level where greater personnel
skills and more adequate tools and equipment would be available. The fre-
querncy of occur-ence would b- of value in establishing provisioning support
requirements.
20
5.0 CONCLUSIONS AND RECOMMENDATIONS
Performance ot this engineering study and investigation produced several signifi-
cant results. In addition to those presented under the Summary, Section 2, other
results included .mportant findings related to this pr',ject. These findings are
denoted below as conclusions and recommendaticos.
5. 1 Conclusions
Conclusions reached as a result of this study are -
"* Mean-time-to-repair (MTTR) statistics, developed in this study, wili
provide actual values from which to predict time to repair of compo.ýent/
replace e items in the Air 1-orce inventory.
"* Contractor generated mlintenance reports (WOTRs) provide valid data
sources for development uf MTTR statistics.
"* Engineering analysis and development techniques described it, this study
proved satisfactory for development of MTTR statistics.
"* Data presentation formats developed as part of this study facilitate the
use and application of MTTR statistics.
5. 2 Recommendations
Recommendations based on the findings of this study ,re -
"• This study should be extended to include MT'rR statistics for mechanical
components of the JUPITER Weapon Systt..n.
"* Additional data sources, applicable to the JUPITER Weapon System
should be investigated :or potential MTTR statistical information.
21
4
* Additional MTTR statistics should be developed using available
Air Force maintenance data repoi-ts from other selected weapon
systems and equipments.
22
APPFENDIX i
WEAPON SYSTEM SUMF.ARY
(COMPONENT ACTIVE MAINTENANCE TIMES)
2•4
x x
MaCa C CD CD IX CO CO CD CD CD OD CD Ca CD Z
Lo I IA 30a a -- ~ -a a-4- 4 a 4 4 M
302 2 2~ W a
b 2 2 2 2 2 2 2 2 2 '.
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a a a a a a a a a a s a 2
CCC C' 0 0 0C 4
x
12
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
f" P1 M1 fn 11 4 9 m9 M 9 M1 M9 m9 m9 " P 1 mn 6 0 0 n n m) 1 A n r, n m n ^ m 6
-4 -. -4 - -4 -4 4 .4 1 - -4 -4 - 4 4 -o 0 0 0 0 0 0 0 0) .. 0 0 0 0 0 0 0 0 i
m m m m m 0 z x Z
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MAJOR EN2D ITEM IDI-"-TIFI2ATICN
i Major Dad Items of the Jupiter Weapon System were identified by Figure
A" nvnbers as well s,: nomenclature and Federal Stock Numbers.
A mejor end item is defined as a finished item complete within itself
ard ready for its intended use.
The Figuxe "A" numbers were assigned ir accordance with Air Force policy
for rapid and ready reference to and identification of the many end items
that constitute a complex weapon system.
In some cases the Federal Stock Number ie preceded by th- '-tters '"I-AF
or "MBAD". These letters indicate that the item is stockt, primarily by
the Mobile Air Materiel Area (MOAVA) and for a particular weapon system.
It is not necessarily, howe;er, an item peculiar to that weapon system.
6 The major end items listed are those for wri ihain ,enzzCe az. -me
s .aiszics for elec-r'.cal, elec rconic 9r-i elec ro-mechanical components
weren, applizable.
Fig. "A"No. Nomenclature Fe,.eral Stock Number
1M Missile
Electrical Equipment Trailer MBA? 4935-710-2555
5 Power Distribution Trailer 3.450-71o-2499
1-00 kW Mobile Diesel Generator 1450-7!C-25.Jl
7 Missile Transport Trailer 1450-710-2503
Fuel Transpoier 1450-710-2492
S9 LOX Transporter M32A4 2331)--i-0-2497
13 Nitrogen Service Trailer i450-7r0-251b
1i Hydro-Pneumatic Trailer 1450-710-249b
25 LOX Transfer Trailer 14,g-710-2500
52 Theodolite Assy, Short Range MBAF 4935-'79-67255b VertIcal Tall Shelter 1450-710-2490
4
Fiag- A' Ncmenclature Federal Stock Number
Launch Control Trailer 1440-710-2491
96 Load Bank A-sy, Modified WaF 493K.713-7b3b
102 Fault Isolation -railer MBAF 4935-710-2549
105 Vacuum Pump, Trailer Mounted MUAD !4)0-6U1-d4b5
132 Cleaving and Purging Equipment. MBAF 4935-713-5952
202 ST-90 Test Set
204 Frequency Standard Set 6t25-7b9-5698
205 Zlectrical Test Equipment
207 Power Control and Distribution 6110-766-6436
Console
208 Motor Generator, Power Dist.Trailer 6125-767-0939
209 Inverter & 3ynchronizer Assy, MOD I MHBA 4935-710-0679
216 Guidance Computer Test Set MBAF 4935-710-2550
219 Ccntrol Corputer Test Set MBA? 4935-713-047
220 Inverter rest Set MW4AF 4935-713-0486
221 Program Device Test Set IMBA 4935-713-0405
222 Networks Components Test S-t YRAF 4935-71 3-0464
223 Angle of Attack Transducer Test Set MBAF 4935-713-0497
224 Electro-Hydraulic Actuator Test Set MWA? 4935-713-0489
225 Distributor Test Set KIBAF 4935-713-04W6
226 Electric, Hydraulic, Pneumatic
Components Test Set
22b Rocket Engine Test Stand MBAF 4935-713-0499
230 Ground Auxiliary System Test Stand MBAF 4935-713-0501
236 Fuel Trailer Test Set MBAF 4935-714-4539
238 Liquid Oxygen Transfer Trailer KEAF 4935-713-3305
Test Set
240 PcArer Distribution T"r-ailer Test Set MBAF 4935-713-3491
55
Fige "A" Nomenclature Federal Stock Number
242 LOX Tanking Computer Test Set
243 LOX Replenishing Comtrol Valve Test
Set
244 Missile Checkout Unit MB•L 4935-713-3326
249 Battery Charger, AC Pom cred b1p-224-W0
254 Guidance an Cocrol Test Consoles
4O1 Liquid Oxygen and Nitrogen Generating 3655-MGy3-92-22
Plant
477 Motor Generator, 23V DC 6125-767-0939
i
I
I
} j
1I
j[5
I
Following is an alphabetical listing of major end items for which
maintenance task time statistics for electrical, electronic and electro-
mechanic&! components were developed:
Nomenclature Federal Stock Number
Angle of Attack Transducer Test Set MBAF 4935-713-0497
Battery Charger, AC Powered 6130-222-6204
Cleaning and Purging Equipment WBAF 4935-713-5952
Control Computer Test Set MBAF 4935-713-0487
Distributor Test Set MBAF 4935-713-0488
Fleztrical Equipment Trailer MBAF 4935-710-2555
Electro-Hydraulic Actuator Test Set MBAF 4935-713-0489
Electric, Hydraulic, Pneumatic ComponentsTest Set
ElectrIcal Test Eqaipment
Fault isolatzon r-Trailer MS;,F 4935-710-2549
Frequency Standard Test Set Set 06225-7o9-5698
,Iel Trailer Test Set MBAF 1935-714-4539
Fuel LTansporter 1450- 710-2492
100 KW IU bile Diesel Generator 1450-710-2501
Ground ,ux.'iiary System Test Stand mBAF 935-713-0501
Guidance Computer Test Eet MBEF 4935-710-2550
Guidance and Control Test Consoles
Hydro- Pneumat "z Trailer 1450-710-24g5
Inverter and Synchronizer Assy., Mod 1 MBAF 4935-710-0679
inverter Test Set MBAF 4935-713-048&
Launch Control Trailer i4IO4-710-2491
Liquid Oxygen and Nitrogen Generatng Plant 3655-MG36 92-22
Liquid Oxygen Transfer Trailer Test Kxt MLAF 4935-713 3305
Lead Bank Asay., Modified M!PAF 4935-713-7638
57
Nomenclature Federal Stock Number
LOX Tanking Computer Tep, Set
LOX Replenishing Control Valve Test Set
LOX Transfer Trailer 1450-710-2500
SLOW. Transrrter M32A4 2330-710-2497
Missile
Missile Cheakout Unit MW 4935-713-3326
Missile Transport Trailer 2450-7!0-25",
Motor, Generator. 28V. DC 6125-767-0939
Netvorks Components Test Set MBAw 935-713-0484
Nitrogea Service Trs•iler 1i50-710-2506
Pover Control and Distribution Console 6110-766-5436
Pover Distribution Trailer 1450-710-2499
Pawer i0istribution Trailer Test Set MBAF 935-712-0491
Program Device Test Set XMA 4935-713-0485
Rocket Engine Test Stand MBAW 4935-713-0499
ST-90 Test Set
Theodolite Assembly, Short Range MBA 493 5-79-7625
Vacuu= Pump, Trailer Mounted mBA 1450-61i-8485
Vertical Tail Shelter P50-710-2490
58
A?7-MDx :;:
71 TEN StUe4A.Y
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APPI-NDI.' V
"AJ.ION 'IAiGN CODLI.3
vAction Taken Codeý," - alphabeLic desigations - iefine specific main-
tenance tasks performed on weapon system items and are i. siinifizant
part of the Air Force Maintenance Data Collection System. 'b7ey are one
seg*,nt of the data used for inspection and maintenance requirements
analysis and are readily adaptable to electronic accounting machine (EAM)
methods of data reporting.
T'he ýodes ,are taken frcm paragraph 9-14 of the Air !orce '.Lanual on Main-
tenance Management, AFM 6b-1, Jhange r;, 7 August 19 3.
ACiI)N TAKEN24 -OD'S
A. •ench Thecked and Repaired - T1his code will be entered when benchT
checý, and repair of any one item is accomplished at the same tLimt (also
see .ode F).
.... 1ench Cnecied-3erviceable (No Bepair Required) - This code will re
enter-ed when ýhe item is tench checKed and no repair was required.
. enen -hec•.ed-iepair Deferrea - 'his code will ue entered when
.encn c-nec. is accomplisned and repair action is deferred. (see iode F).
L. .enn nccea-Ih.t Not reparacle this station) (liepair Not Author-
ize.. - .nis cede will ,;e entered when the shop is not authorized to
zcr•.plish nap rjpai!'. 'rlis code will not oe uses .rlesj the repair
)f :ze item is specifically pronibitea uy current -echnical dlrec-
. -I ..- Lac,: o: -quilnen., tools or 7acili-•les. - This
:oode -.:Ill ý,e entered when repair cannot be acccmplished due to lack of
tq':ip-.e,.t, tcli or fpacilities. Lace of authorization for the re-
;ui red f.:qui•nen. does not precludc use 01' -Iis code.
3. .en-h 2hec:ed-N1R.3-Lace o: .echnical Sdills - .his code vill be
entered when repair cannot be accomplished due to lack of technically
21)
qualifieed people.
Spar~s are no- availatle to acccr.Iis:n repair.
j .. :ench -,ecz d-N11-c-oo -aclog - -nis code will -e ertered vhen
repeir cannot De acccoplished due to excessive shop bac&loF.
t. Lench kbhecked-N•RS-Lac. of: -echnical Data - ýhis code will te
entered when repair cannot be a,ccooplished due to laciK of maintenance
manuals, drawngs, etc., which descrite detailed repair procedures
and req reents.
7. Bench Checked-NRIS-Ex'ess to Ease Re 4irements - -his code will
be tntered when repair will not be scheduled for :hcp repair iue ,o
item being excess to base requirements.
C. For Puture Use.
9. EBench Checked-Condemned - This code will -e entered -when the
item cannot be repaires and is to be processed for condemnation; re-
clamation or salvage. -his code '41l also be used -when a con-
demned condition is discovered during field maintenance disassembly
or repair.
D. For Future Use
r. or Fut•re Use
Repa. i - This code will no; ze used to -ode on-equipment; wor& if
another code vill apply. eJben itý is used in a shop enviroment, this code
will denote repair as a separate unit of wor.- after a tenz Ch.e-.ec-. $hop
repair includes the to-tal repair manhours and includes cleaning, iisass•-
bly, inspection, adjustment, reassemcly and lutrica-lon of minor ccc.pon-
ents incident to the repair when these services are performed .y the same
work center.
G. Re pir !ndlor Replacement of Attaching Units, Ceals, 3askets, Paczing,
Electrical ýconnectious, W ring Circuitb, -. abing, Hose Connectors, Fittings,
Etc. - Work unit codes often do not identify ±tems which fall into this
22C
catei;ory. iberefore, when items of this nature knot identified by
a work units code) are repaired or replaced, this action taktn code
will )e used. In case o0' douut regarding which ccaponent to identi-
!'y in the work unit code block, the work unit code of the component
serviced will be used. For example: If a cannon plug on the landing
gea.r actuator does not have a work unit code, the code for the
landiny ;ear actuator will be entered in Block 7 of the AMIO Forms
210/i'll.
H. Equipment Uhecked - No Repair ilequired (for "on-equipment work
on>y) - ',his code will be used for all discrepancies which are checked
and found to require no further maintenance action. 'ibs code will
be used only if It is definitely determined that a reported deficiency
does not exist or cannot be duplicated.
J. Calibrated - No Adjustment Required - Use this code when an item
is calibrated ani found serviceaule without need for adjustment. If
ýhe iteims require rtdjuscment to meet calibration standards, use Code
". alioratwed - Adjus.nent Rieguired - ;se this code when an item
,.ust ,e adjustea .o meeL calibrazdcn standards. I the item needs re-
l.r in audition to calibration and adjustment, use Code F.
A.tjus. - Includes Lighten, adjust, bleed, balance, rig, and fit.
nter this code whenever a particular discrepancy is cleared by ad-
jusiAn.,,, etc., tine item. If the identified component also required
,-epli-emen j miiu rrd pieces as well as adjustment (new points, con-
denser, tutes, etc.) enuer the appropriate repair code instead of L.
* . A,ýsas_---le - his code will re entered for disassembly action
wnen iie :cx:ple,: maintenance JoL, is broken into parts and reported
221
N. Assemble - This code will be entered for assembly action when the
cm(plete maintenance job is broken into parts and reported as such.
P. Removed - Vais code wiI be entered when an item is removed and only
the removal is to be accounted for. In this instance de:ayed or
additional actions will be accounted for separately. (Also see Codes Q,
R. S. T. and U).
Q. Installed - This -We V-1l be entered when an item is ins.alled
and only the installation action is to be accounted for. (Also see. Codes
P, R, S, T, and U).
R. Remove and Replace - This code vill be entered when an item is re-
moved and another like item is installed. (Also see Codes T and U).
S. Remove and Reinstall - TA-s code will be entered when an item is
removed, for any reason, and the same item reinstalled. (Also s"e Codes
T and 1).
T Removed for Cannibalization - 'Lbis code will be entered when a
component is cannibalized. T?.e work unit code will identify the compon-
ent being cannibalized.
U. Replaced after Cannibalization - This code will be entered when a
ccmpoent is replaced after cannibalization.
V. Clean - This code will be entered when cleaning is accomplished and
is not accounted for under -ode F. This code is used to indicate a fix
or a precaution to eliminate the possitility of f _-tuYe -ucle. Includes
vashing, acid bath, buffing, sandblasting, degreasing, etc. Cleaning and
washing of equipment, that is, aircraft, missiles, etc., support general
codes in the -06 code manials will be used for these actions and thli
action code •ill not be used.
W. Deferred - .his code will be used when the completion of a job (unit
of vorv) is deferred for an 3ppreciable length of time. A later repair
action requires an AFM Foxm with the a;?propriate action taken code.
222
i. est- ct-Service - 1=4s code VIii be entered vi'n w-n Item is
tested or serviced (other tnan •ec• cZecX) and no repair is requred.
Ibie code does noL include servicing or inspection chargeable to support
general work unit codes.
Y. Troubleshoot - Enter this code vhen the time enended in locating a
specific problem is great enough to separate the troubleshoot time from
the repair time. The use of this code necessitates the completion of tvo
s-aparate foris., one for the troublemnoot pbsq., and another for the re-
pair phase.
Z. Paint - Includes painting, stenciling, lettering, installing decals,
etc. Mhis code normally includes preliminary preparations such as clean-
ing, sanding, corrosion control, etc.
223
3APPENDIX TI
KESS 113 WEAPON SYSTEM4
S•tM ANCE PHILOOPHY-
1.0 Philosophy
Maintenance and inspection activities of the RLstle Weapon System vere
performed in accordance with the requirementi of United States Air Force
Tedmical Orderi.
Scheduled maintexance inspection and replaceent philosophy vere estab-
lished by the -6 inspection manual prepared specifically for the weapon
system*
Detailed maiaterance manuals vere prepared for major end itemd mid sub-
assemblies containing ins..ructions for repair, adjustment, replacement
and troubleshooting as applicable.
2.0 Inspectio
In consonance with overall Air Force equipment maintenance policies,
prime responsibility for reliable operation remained vith the using
activities and vher- determined as necessary, frequency and scope of in-
qpections vere vnried to compensate for geographic location,. climate or
other pertinenit criteria. Additionally, inspection requirements were
aalyzed to determine if equipment items were being over or under in-
apected and adjustments made accordingly.
Inspection schedules tonsisted of daily, periodic and special inspec-
tions for the ballistic missile and associated ground equipment at the
launch el•acieamt and Missile Assembly and Maintenance Shop (MM) area.
The requiriiemts vere stated In sufficient detail to identify the equip-
meat to be inspected,, desigate inspection interval requi-ed and deter-
mine serviceability condition.
2.1 Dal] z ectious - The daily inspections were primarily a visual
Inapection (preventive malitenince) to detect maladjustments, obviouls
do&&,, corrosion, leaks and equipweat failures, ubich, if not corrected
2214
wI ...... • ~ "' • m•' •u••• ''['l ... ii '' VI • -F "•i[ il -i i'm • -ii .. i... ' I T•V ... i -T i
would affect the weapon system operz tL-an repdlness,
2.2 Periodic Inspections - PeriodLic inspections wer. cOrposed Or rnie-
tional testa. =a6 insaections performed6 at repetitive intervals over a
sixty (bO) day period these inr'-ctions were performed o' z"-:bsystems,
rather than individual comion-ts, and were accompliuhed at 7-d&-, 15-
day, 30-day and tO-day intervass.
2.3 Special Inspections - These were inspection requirements that
supplemented the previously outlined periodic inspections. They were
only accomplished oecause of specific events or other than normal cir-
cumstances, or upon occurrence of specific conditions during routine
inspections. Also included were inspection requirements not readily
adaptable to the periodic intervals, for example, inspection based on
cycles, operational hours, etc. Special inspections were primarily
accomplished at six and twelve month intervals and increments of oper-
ational time.
2.4 IM-AS Area Inspections - Ahe MAMS Area inspections consisted of
preven-ive maintenance and f'anctional test inspections necessary to msai-
.n.n .e ;ain nenance urcLi c'uipaent ('1C:G) such as test and checkout
equipmen , a\ the degree of ,erviceability required. They similarly
included daily, periodic and special inspections, based on calendar
time and cycle or operational hours.
2.5 heplacement Schedule - •be replacement scheduler list the c.or sub-
assem', Uiez and end items that required mandtosry replacement based on
operating tine, calendar time, or cycles or all as appropriatc. Replace-
ment of a particular item was accomplished at the inspection period
nearest the specified replacement frvequency.
•.o Launch iRlscement - At t.ie launch emplacemnt (organizational level)
minor inspections, such as daily and preventive maintenance types, were
performed Dy operating persoi. el assigned to the launch sites. Major
225
IOA -
fSinspectionm involVin incttina1l .' sts and special tes-_ equipm it were
accomp ished Ly mobile maintenance teams, consisting of tec:iical spedial-
ists in electronics, hydraulics, sut~systems etc. Žhe motile maintenance
tea were based at the tAMS area and performed tasks at launch si -es or.
an as-required tasis.
j.O kaln'1,enance
ainn.enanc- o" .. e weapon system was accomplisned by :olloving the p..
plea of Air Force maintenance management philosophy detailed as 'irst.
ttrough fiftn ecnelon, and nov identilied as organLiza~ion (user level/,
field (repair) and depot (major overnaul ic cl.
Instructlons for repair, adjustment troubleshootine or other means for
correcting deficiencies were delineated in maintenance mznuals for all
major end items and subassemolles of the weapon system.
3.1 At the user level (launch site), maintenance consist 1 of minor re-
pairs and preventive maintenance, such as luurication, corrosion preven-
tion and repair of minor leaks.
3.2 Where troubleshooting and removal and replacement o! :,aajor su. assem-
blies and comporents were required to effect repairs at the launch site,
_,obile maintenance teams from the l-S area were utllze., •oth for
scheduled and unscheduled maintenance Lasks.
3.3 Repair of m&jor subassemolies, components, and time-li-mi c items re-
moved based on -.he replacement schedule, was &ccomplished at -he ML.
Th ,--p-oximated depot level repairs in some instances, where acil!.tes
and repair-parts were available.
3.4 Depot repair and cvernaul of such items as rocke, engines k-,d air
bearing gyros wre accomplished at the appropriate Air M.ateriel Area or
contractor facilitites within the 2ontinental United States.
226
b
APIF.1NDIA VII
MAiYDIAAitUL. DE.FIJNITIONS
A. M--ITi-77- 'zaated 6 AprA, 1964)
A ! Accive Maintenance Time - The time during which preventive
and corrective maintenance work is actually being done on the item.
A.2 Maintenance - All actions necessary for r-2aining an item in.
or restoring iý to a serviceable condition. Ma.i.ntenance •ncludes
serv.cirA, repair, modification, overhaul, inspection Eid condition
determinat: on.
A.3 Maintenance Task - Any action or actions required to preclude
the occurrence of a malfunction or restore an equi'pwt to satisfac-
tory operating condition.
A.4 Mean-Time-To-iepair (MTi/) - The statistical mean of the dis-
tribution of times-to-repa&r., The summation of active repair times
dur.ig a given period of time divided by the total number of mal-
funct-ons during the same tim intervaL.
B. The United States Air Force Dictionary (Amnded November 1957
B.1 Organizatson Maintenance - That maintehiiace which a using
organizat:,on performs on .-ts own equilmemn:. Organization mainten-
ance includes:
Inspection
C: e anW'
Servicing
Preservation
Lunr-.cat .on
Adjustment
M-nor repa-r not requlring detailed disassembly
Replacement of minor rwarts not requ-r.n- I ý tech-.f!sI skill. This
"*Ype of maintenance was formrly i~vided into two parts. known as
227
'firs. echelon m-intenance' and 'second-echelon maintenance'.
?.2 Yield Maintenance: - .be maintenance given aircraft or other
_ equiameft by the maintenance group at wing level. Equivalent to
what va f ormerly called 'third-echelon maintenance'. •his mainten-
ance requires ,:-ýrt..n fixed shops and unit assenblies not available
for organizational vat•intenance.
B.3 Depot Maintenance: - lhe maintienace, repair, or modification
given aircraft of other equiynent requiring major overhaul or com-
plete rebuilding of certain parts, and usually provided fo- only at
an air depot. Formerly called 'fourth-echelon maintenance'. hbe
more extensive shop equipment and the nigher technical sidll of per-
sonel that enter into depot maintenance distinguish it from fielk
malntenance.
228
4!- ,: !
gAD'T-~rTV 'rTy
'his is a coding sys~em of no-significant five digit nut-tLers
assigned to establishments which are manufacturers of supply itemi prn-
cured ty agencies of the Federal iover-ment.
VJendor codes used on the data sheets for identi;'ying manufacturers
were taKen from ;ataloging Handbooks H4-1 and H4-2, Federal Supply -ode
for Manufacturers dated October 1963, with Supplements caed February
1964, and April 19bli respectively.
Handbook H4-1 is an alphabetical lis-ing of manufacturers with
assigned supply codes and Handboo4 114-2 is a ntmierical listing of code
numters -itn the -ognizant manufacturers. -beir use eliminates the
possioility of error in source identificmtion, simplifies recording of
:endor identification and is readily adaptable to electronic account-
ing machine (hiAY) processing of information.
A tvypical example fram Handboo.-t H4-1 is:
2nrysler corporation .issile Division 0723
of •xfenst ---perations Division,
-3Z-ren, icnigan
229
Unc '_a. s-ie
. Se-"unty "sassification--- ~ ~ u i Ton n&T aittrfDOCUi!MT C~n4T*n' hA'AA DAt',
rs$*_ýfy *A#J.hCrut,{ro o! I'll* bo of obotmlcf e,,d sndezi-Vl an'twtaro wwor be) ens, t - " wA br o~milt rops,O ¢iseOthod
ORIniNA TIN G ACTIVI-Y (ColPotk•t.e 0.0 ) 120 REPORT 09COit T. C LA5I111CA&TfON
Rome Air Development Center __UNCIAS
3riffiss Air Force Base Zb oftoup
Rome, New York 13442 , _3 REPORT TIT?.I!
Analysis of Maintenance Task Tiswe* t
4 DESCIRIPTIVE NOSES (T
y" *t. • 0 ,t U udjv. dies")
Finl Re•or Oct 1_ý6i - Oct iq.64I AUTP4o0S) (Lost nw&. bt name trintial)
Ch.rsler CorpMissile DivisianWarrep, LAcbi~an
6 mEPiOUT•" OAT! •?ll VOPce-ber 1964 N ,7 NO or NE[U
Vol 21 229• Yol 11 --S. CONTRA.!T On GRANT NO ** OUISINATOW0 k..:PomT %UjUE*'R)
AF3G(602)-3229 RADC TDR 64-373, Vol 1, Vol IISfoJSC ,, ' 551l
Task 551901- N ,b
d
0 Av&1LAP1j•1TY'L1'1TAI8* ° NOTICE 1 . Qualified requesters my obtain copies of this report
from DDC.2. This report has been released to Office of Technical Services, Department of
(r-~~-pfnry, scalp-I' ze jnevnj ptihlir.11 SUPPLEMENWTARY NOTESI is 5PONSONING MW4TlAlY ACRTIITY
Rome Air Development Center
Griffiss Air Force BaseRom. New York 132
13 ABSTRAC"
This study and investigation vas undertaken to develop maintenance tas.i time datafor conponent/replaceable Items of a be.llistic missile system. Maintenance tasktime data were researched from unscheduled mintenance actions recorded in the fidi.rini the operational phase of the JUPIT Weapon System (WS-315A2) covering aperiod of three years.
Stat..tica. Lnfnormation vas co=upted as -ini =-Lm-Zime-to-repair, maximum-tlm-to-repair and mean-time-to-repair (.M•!r) data for individual components. These sta-tistics were corre2ated with component identification both by fumction and FederalStock Nurnber.
Active raintenance times were tabulated on alphabetical nomenclrture listings ofccponentireplaceable items grouped by:
(1) A '4eapon System S•mmry denoting overall systet experience.
(2) An End Item Su.mory denoting specific applications within equipments.
The active maintenance times were identified in these listin4-s as to minimn, mesa,and maxin=-tine-to-repair levels. Component ancillary minteance data mere alsotabulated on alphabetical nZomenclature listings as a Component/Replaceable Item
zSx-ary with end item grouping.
DAD D 1473 UnclssifiedSecunty Classficaston
- -0•"i :•1"<,li •" ' i ..... "-< < ~ r~i]- •• "'l: I •I .. ... I fli n : •# !%"it ~itll~i'• .........i•}l" f''•='il '-'~l is:lil:-i I ... ,,- -'•-,•<,•,•,,I
Sft-utiqy Classificationi
I OhK i ni n I5ni5 C
rS ± gnI
1. ORIGINATING ACTIN TY Ewter the name and address imposed by secutity classification. using ultandad &-selementof the- contractor, stabcilictractot. pranste. Depretiment of Dal such ass(Ons. acitt af Other OrTaaiza5tiol (corporate author) saintig (1) "Q4ualified requesters wny obtain copies of thisdth report. repor filo DDC. -
2& RPORTSECRITYCLMSF'CTION Entr ze ovr- 2) "F oretgn armoinc~eme and dissemnination of thisall security classi iation of the lieport. Issdicate, wanthe ra by DOC is not authorizedl.""Restncted Datae" &a uacluld. Marking is to be in accord.ance with appropriate secuwill regulations. t J' "U. S. Governmrent agencies may obtait. copies of
2b. ROU Atomaic ownrailingto piriftd t Do D.this report diees.ty from DDC. Other quailified DOC
recttve 5201.10 and Amned Forces Industrial Martuall Enter usr I! eus
thin group number Alto when applicable show that optionalmairkings hawoe been uaeS for Group 3 and Oroiwl 4 as athor- (A,' "Li &. military agencies fr.&) obtain call~ Lf thisIzed report divrcil fromt PDC. Other qualified users
&. REPORT. TITLE- aLie the cowolete report title in all arha!! request throughcapital Wletes. Titles iii all costs should be wriclaussfied.If a mreaftiaglul title cainnt be selected saiihou claeifi..tion* show title clasaificat toni all capital* a'. p~arerhstriha il All distribution of this -srpor! is controlledI, QusI-
timmediatiely following toie title, difed DDIC use"s sall request through
4. DESCRIPTIVE NOTES Uf appropiriate, enter the tepe of ______ __________
report. *g. interia". psogressll. sam~nary. annuaL, at fillu , If til replr has been furnished to the Office of TechnicalGive the inclusive seta when a apscaitc reporting period to Services, Depserii-ent of Cpmeitrcer for sale to the pubilic, indic Dvirfed Cat. this fact Oid eniter the pri.ce. .1 known.l
S. AUTW)R(S Eiter the name(s) of sauthits as shown 0 I L SUPPLEMN-1TARY %0TES& Usse for, additnorll expisiosor in the report. Kit.e. tost nwi, first name. utiddle initial. to noesIf trilitary, show rank and branch of service. The name ofthe principal - other .. an atasciu minimstum ~reszrent. 12 SONSDRING MILITARY ACTI71MTY ELii er the snaive of
& RPOR DA-_ ~str Te ateof he epot as dy. the departmental project office or labIortr sposoring `joaw'.
month. year; or mama. year. If woat than one date appears rgfr h esac n eeoisn.Il ades
on -he report. use date of pubiation. 13 AB3STRACT Einter ans abstract biting a brief and factualairer, of the document snrt.caimvr f she repo- reven though
7& TTALP~bER O lii Te ttal ageco-nt. it may also appear elsewhere ;n tihe body of the technical reshossd fol~os wiotmael pagination procedress ie., ener the poil If additional space ts required a e..ntinua'..'r sheet sheillnumber of page torstaitaig slort'ition.
7b %IUMER 0OF RELFERENCES ELener the total mili~min of It ra tII de~inabi that the abstal of classified reportsreferensces cited in the reotil he unclassified Fach paragraph. of the abstract shalI end with
44B. CONTRACT OR GRANT NUIMER. If appropriate. eater an inr'icsstaot of the military security classiiscation Af the in-
heapplicable nsumber of the contract or gram* under which f..rtination ;n -he Paragraph represented as Ts' f's 'c' Btereport was written.Thnisn iittnnte eghotesatr i..
ab. Or. AL ad PROJECT NUMBI!X Enter the appropriate ever the siýgge**ed lenith is fronm ISO to 225 word,,
sulbtrojc dapatme isrotiamclassifnier takc nuribetac 14 KEY WORDS Key words ame techn~calil trneanagfut t, msa5Ut~iO)cl !~it'~T 5ys~tt ti~nbe5 ak nutie. ~or shor ph-sues -hat characterize a r-ep, and mnav b- used a
9& ORIGINAT NR'S REPORT NUMBER(S) Liter thl c(A- index ents, es lor catalogir'g the report Ke %ords ousltibe-
ci .1 report nuartibwr by whiuch the documentg Will be identtfied selected so that no securityr ctassificationu is woqm.iwnd Identia A coremolle by thqv oriaiaattatg activity. Thile rusimb must hiers such as equipment model designation trade name militaryLe unique iolh:s report.l Project :*de namet geographic ic-cation -- ýe tbe ised as key
96 OT HER REPORT NUBERil If lthe report has been words but wii! be fol awed by an a-dicaticm :-f rchnicll con
assigned eira other relew Illuasibers (&,ther by the oridirsator telt The assignment of links mtles and weights is optional
or 6Isw the apoarir) also elite t his, nuaImo a).
10. AVAIL ABLITY LlIMITATION NOTICES Ewter sisy itintattors ott firther dsasisemistion of the report othent than those
Securiti, Classti 1cation
! 11a