lear 1a anti ice and environmental
TRANSCRIPT
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L e a r j e t
3 A
P i l o t s
Manual
T BLEOFCONTENTS
Wyfl om
v
NTI I CE
ENV RONMENT L
Ant i i ce
Syst ems 6 - 1
I c e
Det ect L i ght s . 6 - 1
Wng I nspect i on
L i ght
. 6 - 2
Engi ne and
Nacel l e
I n l e t Ant i i ce
. 6 - 2
N CHE T
Sw t ches
. 6 - 2
N CHTON
L i ght
6 3
L
and
RN C
HT
Li ght s
. 6 - 3
WngAnt i i ce
. 6 - 3
ST BWNG
HE TSw t ch
WngHeat
Funct i on
6 3
Wng
Ant i i ce Syst em Fi gur e 6 - 1 6 4
WNGTEMP
I ndi cat or
. 6 - 5
WNG
OV
HT
L i ght
. 6 - 5
Hor i zont al S t a bi l i z er Ant i i ce
6 5
ST B
WNG
HE T
Sw t ch
S t a bi l i z er
Heat
Funct i on
6 6
ST B
HE T
L i ght
6 6
W ndshi el d
Ant i i ce
6 6
W ndshi el d
Ant i i ce
Syst em Fi gur e 6 - 2 6 7
WSHLD
HE TSw t ch . 6 - 8
WSHLDHT
L i ght
6 8
WSHLDOV
HT
Li ght
. 6 - 8
W ndshi el d
Defog
6 9
WSHLD
DEFOG
Sw t ch
. 6 - 9
L
and
R
WSDEFOG
Annunci at or s
. 6 - 1 0
W ndshi el d
Defog
Syst em Fi gur e 6 - 3
. 6 - 1 0
W ndshi el d and
RadomAnt i i ce
Al cohol
Syst em
6 - 1 1
LCOHOLSw t ch
6 - 1 1
LCLOW
aut i on
Li ght . 6 - 1 1
Al cohol
Ant i i ce Syst em
Fi gur e 6 - 4 6 12
P i t o t - s t a t i c andSt a l l
Warni ng
Ant i i ce 6 13
PTTOTHE T
Sw t ches
. 6 - 1 3
PTTOTHT
Li ght . 6 - 1 3
OxygenSyst em
6 14
OxygenSt or age andPressure
Regul at or 6 14
OxygenSyst emSchemat i c Fi gur e 6 - 5
. 6 - 1 5
OxygenPressure Gage 6 16
OxygenSyst em
Cockpi t
Cont r ol s
. 6 - 1 6
PM 121
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L ea r j e t
3 A
TABLE
OFCONTENTSCont
Passenger
Masks
6- 17
Passenger
Mask
Fi gur e
6 - 6 )
6- 17
Crew
Masks
6- 18
CrewMask
6600214 S e r i e s
Fi gur e 6 - 7 )
6- 18
CrewMask
Scott TOMC10- 15- 01 Fi gur e 6 - 8 ) 6- 19
Pressur i zat i on Syst em
6- 19
Normal
Pressur i zat i on 6- 20
Emergency
Pressur i zat i on 6- 20
Pressur i zat i on Syst em
Schemat i c
Fi gur e
6 - 9 )
. 6- 21
Pressur i zat i on
Cont r ol s
and
I ndi cat ors
6- 22
BLEEDAIRSwi t ches
6- 22
BLEED
AIRWarni ng
Li ght s
6- 22
C BAIRSwi t ch
6- 23
CAB
AIR
Li ght
6- 23
Pressur i zat i on
UTOM N
Sw t c h 6- 23
Cabi n
Cont r ol l er 6- 23
Pressur i zat i onManual
Cont r ol
Lever UP-DN
6- 24
CABI NALT/DFF PRESSGage
6- 24
CABI NCLI MB
I ndi cat or
6- 24
EMER
PRESS
OVERRIDE
Swi t ches 6- 24
CABALT
Li ght
6- 25
Cabi n
Al t i t ude
Warni ngHorn
6- 25
SYSTEM
TEST
Swi t ch
CABI NALTFunct i on 6- 25
Ai r Condi t i oni ng andHeat i ng 6- 25
Pr i mar y Heat i ng andCool i ng
Bl eed
Ai r
6- 26
Tai l cone Bl eed- Ai r Di st r i but i on Fi gur e 6- 10
6- 27
CAB
AIR
Swi t ch
6- 28
UTOM N
Sel ect or
6- 28
HOT-COLD
Temper at ure S e l e c t o r 6- 28
Ai r
Di st r i but i on
Schemat i c
w t h R12 Freon Cool i ng Syst em Fi gur e
6 - 1 1 )
6- 29
w t h R134ACool i ng Syst em Fi gure 6 - 1 2)
6- 30
TEMP
CONTI ndi cat or
6 - 3 1
CABI NTEMP i ndi cat or
6 - 3 1
Temper at ure Cont r ol Schemat i c Fi gure
6 - 1 3)
6- 32
R
FreonCool i ng Syst em
Ai r c r a f t
wi t hout
For war d
Evapor at or
and Bl ower
Uni t 6 - 3 3
R Freon
Cool i ng
Syst em
St andar d
Evapor at or
Fi gur e
6 - 1 4 )
6- 33
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P i l o t s Manual
TABLEOF
ONTENTS
Cont
COOL-OFF Swi t ch 6- 34
CABINF NSwi t ch . 6- 34
Cabi n Bl ower
Di ver t er
Cont r ol
. 6- 34
REWF N
Swi t ch
. 6- 34
R12
Freon
Cool i ng
Syst em
A i r c r a f t wi t h Forward
Evaporat or and
Bower
Uni t . 6 35
COOL-OFFSwi t ch 6- 35
CABIN
F NSwi t ch 6- 35
Cabi n
Bl ower Di ver t er Cont rol . 6- 36
R12
Fr eon Cool i ng
Syst em
Opt i onal
For ward
Evaporat or
Fi gure6- 15 . 6- 36
REWF N
Swi t ch
. 6- 37
R134ACool i ng Syst em
. 6- 37
COOL-OFFSwi t ch
6- 38
GASPERFAN
. 6- 38
FLOODFANCont rol
. 6- 39
REWF NCont r ol . 6- 39
R134ACool i ng
Syst em
Fi gure 6 - 1 6 ) 6- 39
Auxi l i ary
Heat i ng Syst em
. 6- 40
CrewHeater 6- 40
Cabi n Heater . 6 - 4 1
UX
HTSwi t ch
. 6- 42
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P i l o t s
Manual
ANTI ICE
SYSTEMS
SECDON
ANTI ICE
ENVIRONMENTAL
Ai rcraf t
a n t i - i c e protecti on i s provi ded through t he use of
e l e c t r i c a l l y
heat ed
a n t i - i c e
sys t ems,
engi ne
bl eed
a i r heat ed a n t i - i c e
syst ems, and
anal cohol a n t i - i c e system E l e c t r i c a l l y heat ed s ys t ems
i nc l ude
t he
pi -
t o t - s t a t i c
probes,
t o t a l
a i r
t emper at ur e
probe,
engi ne
i n l e t
a i r
t emper a-
ture
and
pressure sensors,
s t a l l war ni ng vanes, and
hori zont al s t a b i -
l i z e r l eadi ng
edge
E l e c t r i c a l l y heat ed w nds hi el ds pr ovi de
w nds hi el d def oggi ng Engi ne
bl eed
a i r i s u t i l i z e d t o heat t he
wng
l eadi ng
edge,
w ndshi el d,
andnacel l e i n l e t s Theal cohol systemi s i n -
s t a l l e d t o
pr ovi de a n t i - i c i n g
f or t he
nose radomeand
backup
a n t i - i c e
protect i on
f or t he p i l o t s
w nds hi el d i n
event
of
nor mal
ant i - i c i ng s y s -
temmal f unct i on
ICE
DETECT
LIGHTS
Two i c e
detect
l i g h t s are i n s t a l l e d
on
t he f or war d
gl areshi el d t o
i n d i -
cate
i c e
or
moi s t ur e
f ormat i on ont he
w nds hi el d dur i ng
ni ght
opera-
t i ons These
l i g h t s
ar e
i l l um nat ed whenever
t he
BATTERYsw t ches
are On
Wen
part i c l es of
i c e
or moi s t ur e f or m
l i g h t
ref ract i on resul ts
i n
t he appearance of two r ed a r e a s
appr oxi mat el y 14 2
i nches
38
mm
i n
di amet er,
on
t he
w nds hi el d
The
l i g h t
on
t he
p i l o t s
s i de
i s
l o -
cated
i n
a
pos i t i on covered
by
t he
w nds hi el d
a n t i - i c e ai rs t ream The
c o p i l o t s
l i g h t i s
posi t i oned
out si de t he
a n t i
i c e ai r st ream
t h e r e f o r e
t he c o p i l o t s w nds hi el d must be
moni t or ed
whenever
w nds hi el d
a n t i - i c e
system i s i n
oper at i on
Ther ed
areas
i ndi cate i ce
encounters
whent heOATi s bel ow
f reezi ng
and
moi st ur e
encounters
when
t he
OAT s
above f reezi ng The
l i g h t s
are suppl i ed 28VDC
hrough
t he t -
ampLandRCEDET
c i r c u i t
breakers ont he
p i l o t s
and
c o p i l o t s c i r -
c u i t
br eaker
panel s
respect i vel y
PM121
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Leazj et 31A
WNGNSPECTI ONLI GHT
Thew ngi nspect i on l i g h t ,
l ocat ed on
t he r i ght
f or war d
f usel age, may
be
used
t o vi s ual l y i ns pect t he
r i g h t wng l eadi ng edge
f or i ce
accu-
mul at i on dur i ng
ni ght oper at i ons
Thel i g h t
i s
i l l um nat ed
bydepr ess -
i ng
t he
WNG
NS?
LI GHT
mmntary
button
on
t he
c o p i l o t s
di m
mr panel The l i g h t
i l l um nat es
a
bl ack
dot
on
t he
out boar d
w ng
l eadi ng
edge
t o
enhance vi sual
det ect i on
of i c e accumul at i on Power
i s
suppl i ed through t he
5-amp
WNGNSP
LT
c i r c u i t
br eaker ont he
c o p i l o t s c i r c u i t
br eaker panel
ENGNE
ND
NACELLE
I NLET
ANTI - I CE
Theengi ne and
nacel l e i n l e t a n t i - i c e
s ys te m
pr ovi des
a n t i - i c e
protec-
t i on f or t he nacel l e i n l e t s and t he
engi ne
i n l e t ai r
t emper at ur e
and
pressure
sensor mas t s
Theengi ne
i n l e t s ar e a n t i Toed bydi r ect i ng en-
gi ne
bl eed ai r
through di f f u s e r
t ubes
t o
t he
i nner surfaces
of t he na-
c e l l e i n l e t l i p The engi ne a i r
t emper at ur e
T Z ` 2 )
andpressure Pn
sensor
mas t s
ar e a n t i i c ed by e l e c t r i c a l heat i ng el ement s i n s t a l l e d
i n
t he
base of
t he mas t s
Each engi ne a n t i - i c e system
i s i ndependent l y
oper at ed and
consi st s of
a
PZ- 2/ T~- 2 mas t heat i ng el ement ,
a
nacel l e
a n t i - i c e control
val ve,
a
pressure
sw t ch,
a
control
s w t c h,
an
amber
NAC
HT
i g h t ,
and
associ at ed
a i r c r a f t
w r i n g
andbl eedai r
pl umbi ng
Cont r ol dr cui t s ar e
powered
by28 VDC
suppl i ed
through
t he 75-
ampL
and
R
NAC
HT
c i r c u i t
br eaker s
ont he
p i l o t s
and
c op i l o t s c i r -
c u i t br eaker panel s r espect i vel y
N HEAT
SWTCHES
The
l e f t
and
r i g h t
engi ne
and
nacel l e
i n l e t
a n t i - i c e
s yst ems
ar e
i nde-
pendent l y cont r ol l ed
through
t heNACHEATsw t ches i n t he ANTI-
I groupon
t he cent er s w t c h
panel
EachNAC
HEAT
s w t c h has
two posi t i ons On L or R)
and
OFF Wen
a
NACHEAT s w t c h
i s
pl aced i n
t he
On L or R) po s i t i o n ,
t he associ at ed P12/ T17
sensor
el e-
mnt
i s
ener gi zed,
t he associ at ed
sol enoi d- oper at ed
nacel l e a n t i - i c e
control val ve opens,
and
t he
gr eenNACHTONnnunci at or wi l l
i l l u -
m n ate Engi ne bl eed a i r f l ows
through
t he
open
val ve t o
di f f user
t ubes
whi chdi s t r i but e t he heat ed a i r
on
t he
i nner
surface
of
t he
na-
c e l l e
i n l e t
l i p
Si nce t he sol enoi d- oper at ed
control
val ve
i s
ener gi zed
dosed, nacel l e
i n l e t
a n t i - i c e pr ot ecti on i s oper at i onal i n t he event of
an e l e c t r i c a l
system
f a i l u r e
6
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Lear j et 31A
Pf l ot e Manual
NAC
HT
ON
LI GHT
The
gr een
NACHT
ON
i g h t
on
t he
gl areshi el d
annunci at or panel
pr ovi des
t hecreww t h vi sual
i ndi cat i on
t h a t
oneor bot h
nacel l e heat
s yst ems are on TheNAC
HT
ON
l i g h t
wi l l
i l l umnate
anyt i me
a
NAC
HEATSw t c h i s
i n
t heOn
pos i t i on
LANDRNACHT LI GHTS
The
amber
L
and
R
NACHT l i g h t s on t he gl areshi el d annunci at or
panel pr ovi de t he creww t h
vi s ual i ndi cat i on of
a
nacel l e i n l e t ant i -
i c e system
mal f unct i on
The
l i g h t s
ar e oper at ed by
pressure
sw t ches
i n
t he ass oci at ed nacel l e
i n l e t
bl eed
ai r
pl umbi ng
I l l um nat i on of
a
NAC
HT
l i g h t
whent he
ass oci at ed
NAC
HEAT
s w t ch
i s
i n
t he
On
pos i t i o n
i ndi cat es
t h a t i n s u f f i c i e n t pressure i s bei ng
appl i ed
t o t he
en-
gi ne a n t i - i c e system
due
t o
a
mal f unct i on of
a
nacel l e a n t i - i c e control
val ve
I l l um nat i on
of
aNACHT l i g h t when
t he ass oci at ed NAC
HEAT sw t ch
i s
i n
t he OFF
pos i t i on
i ndi cat es that bl eed
ai r
pressure
i s
bei ng
appl i ed
t o
t he
engi ne
a n t i - i c e systemdue t o amal f unct i onof
a
nacel l e
a n t i - i c e
control
val ve
WNG
ANTI - I CE
The
wng
a n t i - i c e s yst ems
u t i l i z e
engi ne
bl eed
ai r
di rected
through
di f f user t ubes
i n each wngl eadi ng
edge
The
heat ed
ai r
i s di st r i but ed
t o t he wng
root
and l eadi ng edge andthen al l owed
t o ex i t i nt o t he
cent er w ng wheel
wel l ar ea
The
system
c o n s i s t s
of
wng
di f f user
tubes
an
over heat
warni ngl i g h t a
t her mosw t ch
aw ng t emper at ur e
sensor ana n t i - i c e shut of f
val ve
a
wng
t emper at ur e
i n di c at or
a s y s -
tem
sw tch andass oci at ed a i r c r a f t
w r i ng
E l e c t r i c a l
power
f or
system
oper at i on
i s
28
VDC
suppl i ed
through
t he
7
. 5- amp
WNGHTc i r c u i t
br eaker ont he
c o p i l o t s
c i r c u i t
breaker
panel
STAB
WNG
HEATSWTCH
WNG
HEATFUNCTI ON
The wng
a n t i - i c e system i s cont rol l ed
through
t he STAB
WNG
HEATs w t ch l ocat ed
i n
t he ANTI- ICEgroup
on t he cent er sw t ch
panel
The
s w t ch has two posi t i ons
On
STABWNG
HEAT and
OFF Wen
t he
STABWNGHEAT s w t ch i s s e t On,
t he
a n t i - i c e
shut-
of f
val ve
control
sol enoi d
wi l l
cl ose
al l ow ng pr essur e
t o
bui l d w t hi n
t he val ve r ef er ence
chamber s
Thebui l di ng pr essur e
wi l l opena
val ve
i n t he bl eed- ai r
ai rs t reamand
al l ow
heat ed ai r
t o
f l o w through
t he
duct i ng
i n t o
t he wng
d i f f u s e r
t ubes
I n
t he
event
of
an e l e c t r i c a l s y s -
tema i l u r e
t he val ve wi l l
shut of f
t hebl eed
ai r f l o wand w nga n t i - i c e
pr ot ecti on
wi l l
not
be
avai l abl e
PM121
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Change
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Pi l ovs
Manual
ear j et 3 A
WN NTI ICESYSTEM
Fi gure6
6
PM 2
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Manual
WNGTEMPINDCATOR
TheWNGTEMP i nd i c at o r l ocat ed i n t he
ANTI I CE
gr oup
on
t he
center
swi t ch
panel ,
i s
i n s t a l l e d
t o
pr ovi de a
vi sual i ndi cat i on of t he
wng
l eadi ng
edge
t emperatur e
The i ndi cat or r ecei ves
i nput
si gnal s
from
he
w ng
t emperatur e sensor i n s t a l l e d
ont he
i nner sur f aceof t he
l e f t
w ng
l eadi ng edge The i ndi cat or f a c e i s di vi ded i nto three c o l
or ed segment s
bl ue, green,
and
r ed
I f
t he i ndi cat or
poi nter
i s
i n t he
bl ue segment , wngl eadi ngedge t emperatur e i s bel owappr oxi matel y
40F
4C I f the i ndi cator poi nt er
i s
i n t he
bl ue segment and t he
STABWNGHEAT swi t ch i s On asyst emmal f unct i on i s i ndi cat ed
I f t he i ndi cat or poi nt er i s i n t he
gr een
segment ,
wng l eadi ng
edge
t emperatur e
i s
above
40F
4C
I f
t he i ndi cator
poi nter
i s
i n t he r ed
segment , t he
w ng
l eadi ng
edge
i s
appr oachi ng
an
overheat condi t i on
and
cor recti ve
act i on
must be t aken
The
w ng
a n t i i c e system
shoul d
be
energi zed
whenever
f l y ing t hrough v i s i b l e
moi st ur e
and t he
WNGTEMP
i ndi cat or poi nter
i s
i n
t he
bl ue
segment
WNG
HT
LI GHT
The r edWNGOVHT
l i g h t on
t he gl areshi el d
annunci at or
panel ,
wi l l
i l l umnate i n
t he event
t h a t
t he
wng
l eadi ng
edge
heats
t o
215F
102C The l i g h t i s ener gi zed by t he
overheat
want i ng l i g h t
t hermo-
swi t ch l ocat ed on
t he
i nner
sur f ace of
t he
r i g h t w ng l eadi ng
edge
HORIZONTAL
STABI LI ZER
ANTI - I CE
Thehor i zontal s t a b i l i z e r a n t i i c e syst emu t i l i z e s sequenced
e l e c t r i c a l
heat i ng el ement s al ong t he
hor i zontal
s t a b i l i z e r
l eadi ng
edge
The
systemconsi st s of
an
e l e c t r i c a l l y
heat ed
bl anket bonded t o each
ha l f
of t he
hor i zontal
s t a b i l i z e r l eadi ng
edge,
a sequence
t i me r a caut i on
l i g h t a
system
swi t ch,
andassoci at ed a i r c r a f t
wi r i ng Control c i r c u i t s
oper ate on 28VDCsuppl i ed t hrough t he
7S amp
STAB
HTc i r c u i t
br eaker
on
t he
copi l ot s
c i r c u i t br eaker panel E l e c t r i c a l
power f or t he
heat i ng
el ement s
i s
28
VDC
suppl i ed
t hrough a 130- amp current
l i m
i t e r
PM 2
6
Or i gi nal
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Lear j et 31A
STABWNGHEATSWTCH
STABI LI ZER
HEATFUNCTION
Thehor i zont al s t abi l i zer ant i - i ce system s cont r ol l ed through t he
STAB
WNG
HE Ts w t c h ont he
cent er
s w t c h panel Thes w t c hhas twopo-
s i t i ons
On
STABWNG
HEAT
and
OFF
When
t he
a i r c r a f t
i s
i n
f l i gh t
and t he
STAB
WNG
HE T
s w t c h i s On, 28VD s suppl i ed through
t he
s t ab heat
r e l a y box t o t he
sequence t i mer
The
t i mer di s t r i but es
i n-
t e rmt ten t e lect r ica l power
t o
t he
i ndi vi dual heat i ng el ement s i n a f or -
war d- t o- af t sequence of 15 seconds dur at i on each
Approximatel y
3
mnutes ar e
r equi r ed t o
compl ete a f u l l cyc l e The center,
or
par t i ng e l -
ement s ,
ar e
suppl i ed
wthcont i nuous el ect r i cal power
Duri ngnormal
s tab i l i ze r heat oper at i on, t he a i r c r a f t D
MPS
r eadout
w l l
r e f l ec t a
pul sat i ng
current
dr ai n
of
appr oxi mat el y
60-amps i n
15
second
cycl es
At
l east one engi ne
gener at or
must be oper at i ng t o ener gi ze t he s t ab
heat cont r ol ci r cui t s
The cont r ol
c i r c u i t s ar e r out ed through a st ar t
cut -
out r el ay
and
t he r i ght
squat
s w t c h
t her ef or e,
t he
system
s
i noper at i ve
when t he squat s w t c h i s i n t he groundmodeand dur i ng engi ne s ta r t
STABHEAT LIGHT
The
amber STAB
HT
i g h t
l ocat ed
on
t he
gl ar eshi el d annunci at or panel
w l l
i l l umnat ewhenever t he STAB
WNG
HE Ts w t c h i s
On
and t he
heat i ng bl anket par t i ng el ement s
ar e not r ecei vi ng e lect r ica l power
Duri ng f l i g h t i l l umnat i on of
t he STAB
HTl i ght
i ndi cat es
system a i l -
ur e Duri ng ground oper at i on, t he STAB
HT
l i ght shoul d
i l l umna t e
whenever t he STAB
WNG
HE Ts w t c h s
ON
WNDSHIELDANTI- ICE
Primary
w ndshi el d
an t i - i c i ng
i s
acc ompl i s hed
by
di r ec t i ng
condi -
t i oned engi ne bl eed
ai r
through
duct i ng and
cont r ol val ves
toexternal
out l et nozzl es f orward of
t he
w ndshi el d
The
wndshi el d an t i - i c e sys-
temconsi st s
of
an an t i - i c e
over heat
shut of f val ve,
a
w ndshi el d
an t i - i c e
modul ati ng val ve, one l ow l i m t 215F
[ 102C]
and one
h i gh - l im t
250F
[ 121C]
thermoswtch f or ground
oper at i ons,
one l ow l i m t
250F
[ 121C]
and one
h i gh - l im t
270F
[ 132C]
thermoswtch
f or
f l i g h t
oper at i ons,
a green
WSHLD
HT
l i g h t a r ed
WSHLD
OV
HT
warni ng
l i g h t
a
ram
ai r
modul ati ng
val ve,
an
an t i - i c e
duct
t emper at ur e
sensor, an
an t i - i c e
heat
exchanger ,
two
out l et
nozzl e ass embl i es, a sys-
temcont r ol sw t ch, and associ at ed a i r c r a f t w r i ng and bl eed ai r duct -
i ng
El ect r i cal
power
t o
t he cont r ol c i r c u i t s i s 28
VD suppl i ed
through
t he 7 5 amp
WSHLD
HT
c i r c u i t br eaker
on
t he pi l o t s c i r c u i t br eaker
panel
6- 6
PM121
Change
3
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Lear j et
3 A
P i l o t s Manual
Change2
WNDSHELD
ANTI ICE
SYSTEM
Fi gure
6
NOTE Thi s f i gur e i s
i nt ended
t o r e f l e c t t he
system l o g i c
nd not
necessar i l y l l of t he act ual
component s used t o
accompl i sh
that
l o g i c
ONFUGHTTEMPERATURE
UMTTHERMOSIMTCH
RAMAI R
MODaannNG
VALVE
Overheat An t i - I c e
Shut of f l ve
i s
nor mal l y
c l osed
must
be
energi zed
open
ROUNDTEMPERATURE
l e c t r i c a l ground on t h i s
w r e tu rns
UMTTHERMOSWTCH
WSHLD
HTl i g h t
on
SQUATSWTCHRELAY
l e c t r i c a l ground
on
t h i s
wi r e tu rns
makes connect i onwhen
a i r c r a f t
s
on
the
gr ound
WSHLDOVHTl i g h t on
i nput i s power
or
open
c i r c u i t
the
out put
i s
an
e l e c t r i c a l ground
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L ea r j e t
3 A
P i l o t s
Manual
WSHLD
HEATSWTCH
The
wi ndshi el d a n t i - i c e
system cont r ol l ed t hr ough
t he
WSHLD
HE Tsw t ch i n
t he
ANTI - I CE
gr oup
on
t he cent er sw t c h
panel
The
sw t ch
has
thr ee posi t i ons
On
WHLD
HEAT
HOLD and
OFF
Whent heBATTERYsw t ches
ar e
s e t ON
t he wi ndshi el d a n t i - i c e over-
heat shut of f
val ve
i s ener gi zed
t o
t he open posi t i on When
open,
t he
over heat
shut of f val ve al l ows engi ne
bl eed
a i r
t o
f l o wdownstreamt o
t he a n t i - i c e
modul at i ng
val ve
When t he
WSHLDHE T
swi t ch
i s
pl aced i n
t he
On
posi t i on,
a c i r c u i t i s compl et ed t o
t he a n t i - i c e modu-
l a t i n g
val ve and
WSHLDHT
i ndi cat or
l i g h t
The
a n t i - i c e modul at i ng
val ve
wi l l
movet owar d f u l l open u n t i l t he
val ve
i s
f u l l y
open or
t he
WSHLDHE T
swi t ch i s s e t t o HOLDWhen
t he
sw t c h i s
i n
t he
HOLD
p o s i t i o n ,
t he
a n t i - i c e
modul at i ng
val ve
wi l l
r emai n
i n
i t s
l a s t
at tai ned
p o s i t i o n , and
al l owbl eed
a i r
t o t he
a n t i - i c e
heat exchanger When t he
WSHLD
HE Tswi t ch
i s
set t o OFF,
t he
a n t i - i c e
modul at i ng
val ve
wi l l
move
t owar ds
t he cl osed posi t i on
u n t i l
t he val ve
i s
f u l l y
cl osed
or t he
WSHLDHE Tswi t ch i s s e t t o HOLDThe
a n t i - i c e
modul at i ng val ve
wi l l
f u l l y open
or
c l ose i n
appr oxi mat el y
15 seconds The
a n t i - i c e
heat
exchanger cool s the
bl eed
a i r
w t h rami r r egul at edby a
ram
i r
mod-
ul at i ng
val ve
Thi s
val ve
i s cont r ol l ed by t hedownstreama n t i - i c e
duct
t emper at ur e
sensor
and
r egul at es t he
a n t i - i c e
bl eed
a i r
t emper at ur e
by
var yi ng t he
amount
of
ram
i r
al l owed
i n t o
t heheat exchanger
WHLD
HT LI GHT
The
gr een
WSHLD
HT l i g h t , l ocat ed
on
t he gl ar eshi el d
annunc i at or
panel ,
pr ovi des
t he c rew wi t h
a
vi sual i ndi cat i on o f
wi ndshi el d
heat
oper at i on
The i ght
wi l l
i l l umnate
whent he
a n t i - i c e modul at i ng val ve
i n
any
posi t i on
except
f u l l y
cl osed
and
r emai n
i l l um nat ed
u n t i l
t he
appl i cabl e
gr ound
or
i n f l i g h t
l ow- l i mt
t her moswi t ch
t r i p s
or t he
WSHLD
HE T
swi t ch i s
s e t
t o
OFF
WHLD
OV
HTLIGHT
I l l umnat i on of t he r ed
WSHLD
OVHT war ni ng l i g h t , on t he
gl ar eshi el d annunci at or panel ,
i n di c a t e s t h a t
t he bl eed
a i r
t emper at ur e
i n t he
wi ndshi el d out l et nozzl es has r eached t he
appl i cabl e
gr ound
o r
i n f l i g h t
hi gh- l i mt
t her moswi t ch
s e t t i n g
and
t he
wi ndshi el d
a n t i - i c e
systemhas been
shut down I f t he
o ut l e t
nozzl e bl eed
a i r
t emper at ur e
r eaches 250F
121C
dur i ng
gr ound oper at i on, t he gr ound hi gh- l i mt
over heat
t her moswi t ch wi l l
c l o s e
t he
a n t i - i c e over heat
shut of f
val ve
and
i l l umnate the
WSHLD
OV
HT
war ni ng l i g h t
I f t he
o ut l e t
nozzl e
bl eed
ai r t emper at ur e
r eaches
270F
132C i n f l i g h t , t he i n f l i g h t
hi gh-
l i m t over heat
t her moswi t ch wi l l per f o rm
t he
samef unct i on When
t he
PM 2 6- g
Change
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L ea r j e t
31A
P i l o t s
Manual
nozzl e
bl eed
a i r
t emperat ur e
cool s s u f f i c i e n t l y
t he
overheat
t h e r -
moswi t ches
wi l l r e s e t and
al l ow
t he a n t i - i c e over heat
shut of f val ve
t o
open,
ext i ngui shi ng
t he
WSHLD
OV
HTwar ni ng l i g h t
To avoi d
a
f a l s e
WSHLD
OVHT
i ndi cat i on upon
l andi ng, t he gr ound
over heat t h e r -
moswi t ch
c i r c u i t r y
i s
di sabl ed
f o r
10
seconds
a f t e r
t ouchdown,
a f t e r
whi ch
nor mal
f unct i oni ng wi l l
r esume
WNDSHELD
DEFOG
W ndshi el d
i nt ernal
def oggi ng
i s accompl i shed
usi ng e l e c t r i c a l l y heat -
ed
w ndshi el d
panel s The
system desi gned t o
be
acti vat ed bef or e
t akeof f
and
r emai n
on u n t i l
shutdown
The system
consi st s
of two
w ndshi el d
panel s w t h i n t e g r a l
h e a t e r s
w ndshi el d heat
control
u n i t
system
sw t ch,
L
and
R
WS
DEFOG
annunci at ors,
and
associ at ed
a i r -
c r a f t
w r i ng
Thesystem
u t i l i z e s a
163
VACout put
f r om t he
i nver t er
system t o power t he
i n t e g r a l
heaters
The
control c i r c u i t r ecei ves
28
VDCthrough t he5 amp
LWSHLD
DEFOG
and
RWSHLDDEFOGi r -
c u i t breakers on t he
p i l o t s
and c o p i l o t s c i r c u i t
breaker panel s
WSHLDDEFOGSWTCH
The
w ndshi el d
def og system
i s
cont r ol l ed
through
t he
WSHLD
DE
FOG
sw t ch
i n t he
ANTI ICE
gr oup
on t he
cent er
sw t ch panel
The
sw t ch
has
two
posi t i ons
OFF
andOn
WSHLD
DEFOG
Wen t he
WSHLDDEFOG
sw t ch
i s s e t
t o t he On
p o s i t i o n
t he
i n t e g r a l heaters
wi l l be suppl i ed
163
v o l t s
ACpower f r omt he
i n v e r t e r
systemv ia t he
w ndshi el d
heat
control
uni t
NOTE
The
i nver t er
power i ng
t he l e f t C
bus
wi l l power t he l e f t
w ndshi el d
panel
whi l e
t he
i nver t er
power i ng
t he
r i ght
AC
buswi l l
power t he
r i g h t
w ndshi el d
panel
Normal system
oper at i on
i s
i ndi cat ed
by
i l l umnat i on of
t he L andR
WSDEFOG
annunci at or s when t he system
i s
act i vat ed w ndshi el d
t emper at ur ebel ow8 F
[27C Wen
t he w ndshi el d
i s heat ed above
80F
27C , t he annunci at ors
wi l l
exti ngui sh
PM121
6 9
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i l o t s Manual
Lear j et A
LNDRWS
DEFOG
ANNUNCIATORS
I l l umna t i on
of
a
WS
DEFOG
annunci at or ,
l ocat ed on t he
gl ar eshi el d
annunci at or panel , i ndi cat es an over - t emper at ur e condi t i on, under
t emper at ur e
condi t i on
or
l oss
of
or
D
power
Normal
oper at i ng
t emper at ur e
of
t he wndshi el d i s between 105F 41C and 120F
49C
Temperature sensor s ar e
attached t o
each wndshi el d
panel
whi ch pr ovi de t emper at ur e
dat a
t o
t he
w ndshi el d
heat cont r ol
uni t
Shoul d t he t emper at ur e
of
t he w ndshi el ddropbel ow80F
27C ,
t he
appl i cabl eWS
DEFOG
annunci at or w l l i l l umna t e t o al er t t he crew
Shoul d
t he t emper at ur e
of
t he w ndshi el d
i ncr ease
above150F 66C ,
t he
appl i cabl eWS
DEFOG
annunci at or w l l i l l umna t e and
t he
affected
w ndshi el d w l l bedeact i vat ed
When
t he wndshi el d
cool s
t o t he nor -
mal oper at i ng r ange, t he systemw l l r eact i vat e andt he
WS
DEFOG
an-
nunci at or
w l l ext i ngui sh El ect r i cal f aul t s det ect ed
by t he system
moni tor w l l cause t he affectedWS
DEFOG
annunci at or t o
i l l umna t e
LWSHLD
R
WSHLD
DEFOG
DEFOG
WSHLD
DEFOG
83
V
I N
OFF
WNDSHIELDDEFOGSYSTEM
Fi gur e 6 3
6-10
PM 2
Change
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L e a r j e t
3 A
P i l o t s Manual
WNDSH ELD
NDR DOME
ANTI I CE L OHOLSYSTEM
The
al cohol
a n t i - i c e
system i s
u t i l i z e d
f or radome a n t i - i c e pr ot ecti on
and f o r w ndshi el d a n t i - i c i n g i n
t he event of
a w ndshi el d heat i ng s y s -
tem
mal f unct i on
Al cohol
a n t i - i c i n g
i s
accompl i shed
by
di r ect i ng
met h-
y l
al cohol
over
t he
p i l o t s
w ndshi el d sur f ace
through
anext er nal
o ut l e t
i n t he
w ndshi el d heat o ut l e t
nozzl e
assembl y
and
through an o ut l e t
nozzl e assembl y on t he radome Thesystemconsi sts o f a 1
. 7 5
gal l on
6 6 l i t e r )
al cohol
r e s er v o i r , a
f l o a t
sw tch,
af i l t e r a
r e l i e f
val ve, at h r e e -
waycontrol val ve,
a
bl eed
a i r
shut of f and
pressure
r egul at or val ve,
a
systemsw t ch,
an
amberL LOWaut i on l i g h t ,
and
associ at ed a i r -
c r a f t w r i ng The pressure
r e l i e f
val ve i s i n s t a l l e d t o pr event system
over pr essur i zat i on
by
vent i ng system
pressure
gr eat er
than 2 6
psi
17
9
kPa
above
ambi ent ,
and
bl eed
system
pressure whent he
system
i s o f f Thesystem
control
c i r c u i t s oper at e on28VD suppl i ed t hr ough
t he
5 amp
ALC SYS
c i r c u i t
br eaker
on
t he
c o p i l o t s
c i r c u i t
breaker
panel
L OHOL
SWTCH
The
al cohol
a n t i - i c e systemi s
cont r ol l ed
by
t he
three
posi t i on
ALCO
HOLsw t ch
on
t he cent er sw t ch
panel
When t he sw t ch i s
s e t
t o WS/
RAD
c i r c u i t s
ar e
compl et ed
t o
open
t he
shut of f
and
pressure
r egul at or
val ve
and
posi t i on t he t hr ee- way
control val ve f o r al cohol f l o w t o
t he
w ndshi el d andradome Theal cohol
r e s er v o i r ,
pr essur i zed
t o
appr oxi -
mat el y
2
4 psi 16 . 5 kPa above ambi ent t hr ough
t he shut of f
and
pres-
sure
r egul at or val ve, suppl i es al cohol t o t he
w ndshi el d
out l et and
radomenozzl es through
a
f i l t e r
and
t he t hr ee- way control
val ve
When
t hesw t ch
i s s e t t o
RAD t he t hr ee- way val ve
wi l l
posi t i on
t o suppl y
a l -
cohol
f l o w
t o t he
radome onl y
When t he sw t ch i s
s e t
t o
OFF,
t he shut -
o f f
and
pressure
r egul at or
val ve
wi l l
c l o s e,
t he
t hr ee- way
val ve wi l l
r eposi t i on
t o cut
o f f f l o wandsystempressure wi l l
bl eed
o f f t hr ough
t he
pressure r e l i e f val ve
L
LOW
AUTI ON
LI GHT
I l l umnat i on of t he amberL LOWi ght , l ocat ed on t he gl ar eshi el d
annunci at or
panel , i n d i c a t e s
t he
al cohol
suppl y i n t h e r eser voi r
i s l ow
The
r eser voi r
f l o a t
sw t ch
wi l l
i l l umnate t he
l i g h t t hr ougha
r el aywhen
i n t he f u l l down
posi t i on
When t he r e l a y i s ener gi zed, ahol di ng
c i r c u i t
i s
a l s o
ener gi zed
t o
pr event
t he
l i g h t
f r o m
f l i c k e r i n g
due
t o
t he
bobbi ng
mot i on o f t he
f l o a t
Thehol di ng
c i r c u i t i s
deener gi zed
when
t he
BAT-
TERYsw t ches a r e s e t t o OFFand t he
al cohol
r eser voi r
i s
f i l l e d
com
pl et el y f i l l e d
r eser voi r
wi l l suppl y
t he
al cohol a n t i - i c e
syst em w th
appr oxi mat el y 45 m nut es
o f al cohol
f l o w
when pr ovi di ng
pr ot ecti on
f o r
both
t he
w ndshi el d
and radome
or
appr oxi mat el y 2hour s
f or
r a -
dome onl y
PM121
6
11
Change
3
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P i l o t s
Manual
ear j et
3 A
PNEUMATIC
I R PRESSURE
ALCOHOLSUPPLY
OVERBOARDVENT
ELECTRCAL
CHECKVALVE
PRESSURE
RELIEF
VALVE
ALCOHOL PRESSUREREGULATOR
8
SHUTOFF VALVE
L OHOL
ANTI -ICESYSTEM
Roar
6 4
THREE WAY VALVE
FILTER
FLOAT
SWTCH
J
Q
W
Z
O
>2W
W
O>
m
6
2
PM 2
Or i gi nal
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Lear j et
3 A
Pi l ot s Manual
PITOT STATIC
N
TALLW RNNGNTI ICE
Ant i - i ce
pr ot ec t i on f or t he
p i t o t - s t a t i c probes,
t o t a l
t emper at ur e probe,
and s t a l l war ni ng
vanes,
i s acc ompl i shed
by
ener gi zi ng
i n t e gr a l e l e c -
t r i c a l heat i ng
el ement s
i n
each
component
The
i ndependent
p i t o t -
s t a t i c
probe, t o t a l t emper at ur e probe,
ands t a l l war ni ng vane
a n t i - i c e
s yst ems consi st
of cont r ol sw t ches, probe
h e a t e r s
wane
h e a t e r s and
p i t o t heat moni t or s Bot h l e f t
and
r i g ht
syst ems u t i l i z e t he
same
PI -
TOT
HT
l i g h t The
p i t o t - s t a t i c
probe
heat i ng
el ement s r ecei ve
28 VDC
t hr ough
t he r espect i ve 15- amp
L
andRPTTO
T
HTc i r c u i t
breakers on
t he p i l o t s and
c o p i l o t s
c i r c u i t br eaker panel s
Mot
heat systemi s op-
erat i ve
dur i ng
EMERBUSmode The
t o t a l t emper at ur e
probe
heat i ng
el ement
r ecei ves
28 VDC
hr ough
t he
5 amp
T T
PROBE
HT
c i r c u i t
breaker
on
t he
p i l o t s c i r c u i t
breaker
panel
The
s t a l l
warni ng
vane
heat i ng
el ement s r ecei ve
28
VDC
t hr ough
t he r espect i ve 10- amp L
andR
STALLV NEHTc i r c u i t
breakers
ont he
p i l o t s
and c o p i l o t s
c i r c u i t
br eaker panel s
PI TOT
HEAT
SWTCHES
The
p i t o t - s t a t i c
heat s yst ems
are i ndi vi dual l y
cont rol l ed t hr ough t he
MOTHEAT
sw t ches
i n t he
ANTI ICE
gr oup ont he center
s w t c h
panel
Each
s w t c h
has
twoposi t i ons
On
L or R) and
OFF
When
t he
LandRMOT
HEATsw t ches ar e
s e t
t o On LandR) , power
i s
sup-
p l i e d t o each
p i t o t - s t a t i c
probe
heater, each s t a l l warni ngvaneheater,
andt he t o t a l t emper at ur e
probe
heater
PI TOT HTLI GHT
dual p i t o t heat moni t or
systemi s
i n s t a l l e d
t o a l e r t t he
p i l o t
i f i nsuf -
f i c i e n t
current
i s
bei ng
appl i ed
t o
t he
p i t o t - s t a t i c
probe
heat i ng
el e-
ments The moni t or s
ar e
w r ed t o t he
ground
s i de of t he p i t o t - s t a t i c
probe
heat i ngel ement s
Each
moni t or
i s basi cal l y
a
rel ay
whi ch
mai n-
t ai ns
an
open
c i r c u i t
f o r t he PITOTHT l i g h t as l ong as s u f f i c i e n t cur-
rent i s
bei ng
appl i ed t o t he
associ at ed
p i t o t - s t a t i c
probe
heat i ng el e-
ment
I n t he
event
of a
mal f unct i on
i n or l o s s of power t o t he
associ at ed
p i t o t - s t a t i c
probe heat i ng
el ement ,
t he
rel ay wi l l r el ease
and
compl et e
t he
PITOTHT
l i g h t
c i r c u i t
I l l um nat i on
of t he amber
PI TOTHTl i g h t i n
t he gl ar eshi el d annunci at or panel , i ndi cat es
amal -
f unct i on
i n
e i t he r
t he
l e f t
or
r i ght
p i t o t - s t a t i c
heat
system
or
that at
l e a s t onePITOTHE T
s w t c h
i s
OFF
PM 2
6 3
Change l
-
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17/45
P i l o t s
Manual
Lear j et
31A
OXYGEN
SYST M
The ai r c r af t oxygen system
pr ovi des
oxygen ser vi ce f or
t he
crewand
passenger s Thesystemconsi st s of t he crewand
passenger
di st r i but i on
syst ems,
a
hi gh- pr essur e
oxygen
st or age
cyl i nder,
a
shut of f
val ve
and
pressure
r egul at or
assembl y, an
oxygen pr essur e gage,
an overboard
di schar ge r e l i e f val ve and i ndi cat or , an oxygen aner oi d sw t ch, a pas-
senger
oxygen
cont r ol val ve,
l anyar d actuated passenger
mask
oxygen
val ves, andcrewandpassenger oxygenmasks El ec t r i cal power t o
op-
e ra te t he
passenger
oxygen cont r ol val ve i s suppl i ed through t he 75
ampOXYVALVE
ci r c ui t
br eaker
on t he pi l o t s c i r c ui t
br eaker
panel
Oxygen
i s avai l abl e
t o
t he
crewat a l l t i mes and
canbe
made
avai l abl e
t o
t he
passenger s
ei t her
aut omat i cal l y
above
14, 000
750
f eet
cabi n
a l
t i t ude,
or
manual l y at
any al t i t ude
through t he use
of
t he cockpi t con-
t r o l s
on
t he p i l o t s
si dewal l
The
oxygen
system
s desi gned
f or
use
duri ng
emergencydescent t o a cabi n al t i t ude
not r equi r i ng
oxygen
and
i s not t o
be
used f or
extended
per i ods of f l i g h t at cabi n al t i t udes r equi r -
i ngoxygen
or as
a subst i t ut e f or t he normal
pr essur i zat i on
system
Pas-
senger masks
w l l
not
pr ovi de suf f i c i ent oxygen
f or prol onged
oper at i on
above
34, 000 f e e t cabi n al t i t ude
Prol onged
oper at i on
above
25, 000
feet cabi n al t i t ude wth passenger s onboard i s not recommend
ed Smoki ng
i s
pr ohi bi t ed
when
oxygen
i s
i n
use
Ref er
t o
t he
F
Ap
proved
Ai r pl ane
Fl i ght Manual f or l i m t at i ons and oper at i ng
pr ocedur es
OXYGENSTOR G N R SSUR
R GUL TOR
Theoxygenst or age
cyl i nder
has
a
st or age
capaci t y of 4 cubi c f eet 1. 13
cubi c met er s at
1800 psi
12, 411
kPa The
cyl i nder
i s l ocat ed i n t he dor -
sal f i n
or
t he
r i ght
si de
of
t he
nose
compartment
The
shut of f
and
pr es-
sure
r egul at or assembl y forms an i nt egr al
par t of
t he st or age
cyl i nder
and
pr ovi des
f or pr essur e r egul at i on, pressure i ndi cat i on, and servi c-
i ng Oxygen pr essur e i s avai l abl e t o t he passenger andcrewdi st r i bu-
t i on
systems and i s r egul at ed
t o
a
pressure
of 6 t o 8 psi 418 t o 552
kPa when t he oxygen cyl i nder shut of f val ve
i s open The shut of f
and
pr essur e
r egul at or assembl y
al so i ncor por at es
a
bur st
di sc pressure r e
l i e f
val ve t o
di schar ge t he
oxygen cyl i nder cont ent s
overboard
i n
t he
event that cyl i nder pr essur e r eaches 2700 t o psi 18, 617 t o 20, 685
kPa Shoul d t he
cyl i nder cont ent s
be di schar ged over boar d, t he gr een
overboard di schar ge
i ndi cat or ,
on t he
out si de
sur f ace
of
t he a i r c r a f t
near t he st or age cyl i nder , w l l be ruptured or m ssi ng
6- 14
PM121
Change
3
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ear j et
3 A
i l o t s
Manual
REW
M SK
OXYGENSYSTEM
S HEM TI
Fi gure
6 5
PM 2 6 5
r i gi nal
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P i l o t s Manual
Lear j et 31A
OXYG NPRESSUREG G
The
oxygen pressure gage
i s
l ocat ed
on
t he
p i l o t s
si dewal l
Thegage
i s
cal i br at ed
from
0t o
2000
psi Thegage
i s
a
di r ect - r eadi ng t ype t h a t
i s
pl umbed
t o
t he
hi gh- pr essur e
si de of t he
r egul at or
and
i ndi cat es
oxygen
cyl i nder
pressure
onl y
OXYG NSYSTEM
COCKPI T
CONTROLS
The
oxygen
systemcockpi t
cont r ol s
consi st
of
one
cont r ol val ve, l a-
bel ed
PASSENGEROXYG NOFF AUTODEPLOY l ocat ed
on
t he
p i l o t s
si dewal l
above
t he
armest
Thecont r ol
val ve
cont r ol s
oxygen
a v a i l a b i l i t y
t o t h e passenger
oxygen
di st r i but i on systemandpr ovi des
aut omat i c
or manual mode s e l e c t i o n
Oxygen
i s
avai l abl e t o t he c rew
oxygen
di st r i but i on systemat al l
t i mes
when t he
oxygen
cyl i nder
shut of f
val ve
i s open
Cont r ol posi t i ons
and
system f unct i ons ar e
as
f ol l ows
1
Wth
t he
PASSENGER
OXYGEN
val ve
i n t he UTOposi t i on,
oxygeni s
avai l abl e
t o t he passenger di st r i but i on systemandt he
aneroi d- cont r ol l ed
sol enoi d
val ve
wi l l
depl oy
t he
masks
aut o-
mat i cal l y
Shoul d
t he cabi n
a l t i t u d e
reach
14, 000 750
f e e t t he
aner oi d swi t ch
wi l l
open t he
sol enoi d
val ve, t he passenger
oxy-
genmasks
wi l l
depl oy,
and
t he
upper cent er panel
l i g h t s wi l l l
l um nat e
t o
pr ovi de
maxi mum
v i s i b i l i t y
f or
donni ng masks
Nor mal l y, t he cont r ol shoul d
be
i n t h i s posi t i on
2 Wth
t he PASSENGEROXYG Nal ve i n t h e
DEPLOY
p o s i t i o n
oxygen i s
avai l abl e
t o t he passenger di st r i but i on
system
and
t he
passenger
masks
wi l l
depl oy
The sol enoi d
val ve wi l l be
by-
passed andal l ow
oxygen
systempressure t o depl oy
t he
passen-
ger
masks
Thi s posi t i on can
be
used t o depl oy t he passenger
masks
at
any
cabi n
a l t i t u d e andmust be
used
i f el ec t r i c al power
i s unavai l abl e
3 Wth t he PASSENGER
OXYG Nal ve
i n t he
OFF
p o s i t i o n oxy-
gen
i s not avai l abl e t o t he passenger di st r i but i on systemregard-
l e s s
of cabi n
a l t i t u d e Thi s
posi t i on
can be used when
oxygen i s
r equi r ed f or t he c rewonl y
6 16
PM 2
Or i gi nal
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L ea r j e t
A
P i l o t s Manual
PASSENGERMASKS
Passenger
oxygen
masks
ar e st owed i n compar tment s i n the cabi n
c e i l i n g
upper - cent er panel
Whenever
t he
compartment
door s
open
automat i cal l y
PASSENGER
OXYGEN
AUTO
or
manual l y
PAS-
SENGER
OXYGEN
DEPLOY ,
oxygen
i s
avai l abl e
f or
passenger
use
Passengers shoul d donmasks andmust
pul l
l anyard
to
i n i t i a t e
oxy-
gen
f l ow
An
o r i f i c e i s i ncorporat ed
i n t hemask to
pr ovi de aconstant
f l owof 4 1 l i t e r s per
mnute
The
rebreather
bagwi l l
i n f l a t e at
a
seem
i ngl y
s l ow
r a t e whenoxygen
i s
f l ow ng Thi s
i s
normal
Shoul d t he
compartment door be i nadver t ent l y
opened
from
t he
c o c kp i t pres-
suremust be bl ed from
t he systemby
pul l i ng
one
of
t he l anyar ds be-
f o r e
t he
masks
can
be r est owed The
compartment
door s can
be
opened
manual l y
f or
mask
cl eani ng
and
ser vi ci ng
by
rel easi ng
t he
l a t c h
l abel ed
OXYGEN
adj acent t o each
door
When t he
door s
ar e
openedusi ng t h i s met hod
nooxygen
f l ow
i s avai l abl e t o t he
masks
PASSENGER
MASK
Fi gure
6 6
PM 121
6-17
Or i gi nal
-
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21/45
P i l o t s
Manual
Lear j et
31A
REW
M SKS
The
s t andar d
6600214 s e r i e s ) f l i g h t
crew
masks
ar e s t owed
on
straps
behi nd t he p i l o t s andc o p i l o t s
s e a t s
Opt i onal
S c o t t
ATO
M
10- 15-
0 1 ) f l i g h t crewmas ks , s t owed i n access i bl e
storage r ecept acl es
on
t he
p i l o t s
and
c o p i l o t s
si dewal l s, may
r epl ace
t he s t andar d
crew
masks
Thepressure
demandmask
r egul at ors pr ovi de f o r
nor mal , 100
96 oxy-
gen and
emer gency
oper at i on r e f e r
t o t he FAA
Approved
Ai r pl ane
F l i ght Manual f or det ai l ed oper at i onal
procedures)
Each
mask
i n c o r -
por at es a
m cr ophone
cont rol l ed
byt he
MCSELECT
s w t c h ont he
au-
di o cont r ol panel s
Ane l e c t r i c a l cord
ext ends
f r o meach mask and i s
pl ugged i nt o t heOXYMC ack
on
t he j a c k
panel
Communi cati on
be-
tweencrew
members
can beaccompl i s hed by
us i ng t heOXYf unct i on
of
t he
MC
SELECTs w t c h
on
t he
audi o
cont r ol
panel s
ressure de-
t e c t o r i s i n s t a l l e d
i n
each
maskoxygen s uppl y l i n e t o show
v i s i b l e v e r -
i f i c a t i o n of
oxygen
pressure
t o t he mask
qui ck- di s connect
i s
provi ded
f or
each
crewmember When t he mask bayonet
i nsert ed
i nt o t he
qui ck- di sconnect , aspr i ng l oaded
poppet moves
of f
i t s
seat
and
al l ows
oxygenf l o w
i nt o t hemask
suppl y
l i n e
REWM SK66 214SERIES
Fi gure
6 7
6 18
PM121
Change
4
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L ea r j e t
A
P i l o t s Manual
PRESSURIZ TION
SYSTEM
Cabi n
pr essur i zat i on i s
pr ovi ded by
condi t i oned
a i r ent er i ng
t he cabi n
t hr ough
t he
a i r
di st r i but i on
duct s
and cont r ol l ed
by modul at i ng
t he
amount of a i r exhaust ed f r o mt he
cabi n
Thepr essur i zat i on systemcon
s i s t s
of
a
cabi n
pr i mar y
out f l ow
val ve
a
cabi n
safety
val ve
d i f f e r e n t i a l
pressure r e l i e f val ves cabi n
a l t i t u d e
l i m t e r s a vacuumshut of f
s o l e -
noi d val ve apr essur i zat i on vacuum e gu l a t o r
a
pr essur i zat i on mod
ul e
two
bl eed ai r shut of f
val ves twoemer gency pr essur i zat i on val ves
cabi n
a l t i t u d e
war ni ng andemer gency
pr essur i zat i on
aner oi d swi t ch
e s
two
emer gency
pr essur i zat i on
over r i de
sw t ches
an amber C B
ALTcaut i on
l i g h t andanaur al warni ng
systemAl l systemcont r ol s
ar e
l ocat edon
t he pr essur i zat i on
andc o p i l o t s swi t ch
panel
Al l systeman
nunci at or s
ar e l ocat ed
on
t he
gl ar eshi el d
annunci at or
panel
Power
f o r
t he cont r ol c i r c u i t s i s
28
VDCsuppl i ed t hr ough t he 7. 5 amp
PRESS
CONTc i r c u i t
br eaker on
t he
c o p i l o t s c i r c u i t br eaker
panel
and
t he t -
ampCABIN
ARc i r c u i t
br eaker l ocat ed on t he
p i l o t s
c i r c u i t br eaker
panel
CREWM SK SCOTT
TO
15 1
Fi gure
6 S
PM 121
6 19
Change 4
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P i l o t s
Manual
L ea r j e t
3 A
NORM L
PRESSURI ZATI ON
Normal pr essur i zat i on i s cont r ol l ed by
r egul at i ng cont r ol
pressure t o
t he
cabi npr i mar y
out f l ow
val ve
The
control
pressure
may
be r e gu l a t -
ed
aut omat i cal l y by t he CABI NCONTROLLERor manual l y
by
t he
manual
UP DN
control
l ever
r essur i zat i on
vacuum
egul at or i n t he
t a i l c o n e pr ovi des
r egul at ed vacuum
servo
pressure to
operate
t he
val ve
W t h t he
squat
s w t c h
i n
a i r mode and
t he pr essur i zat i on AUTO
M N
w t c h
i n AUTO t he
a i r c r a f t
pr essur i zat i on
system s compl et el y
i ndependent o f t he a i r c r a f t
e l e c t r i c a l system I f
t he
a i r c r a f t i s
i nadver t -
ent l y
al l owed t o ascend andexceed t he
cont r ol l i ng
l i m t s
of t he pres-
sur i zat i on c o nt r o l s
t he nor mal d i f f e r e n t i a l
pressure
r e l i e f
val ve
wi l l
cause
t he
pr i mar y
out f l ow
val ve
t o open
and
mai nt ai n
a
9 . 4
psi 64
. 8
kPa d i f f e r e n t i a l
Shoul d t he
nor mal d i f f e r e n t i a l pressure r e l i e f
val ve
f i l
t he
maxi mum
i f f e r e n t i a l
pressure
r e l i e f
val ve
w i l l
modul at e
t he
cabi n
safety
val ve
t o mai nt ai n
a9
7 psi 67 kPa d i f f e r e n t i a l Cabi n
a l t i -
t ude l i m t e r s
ar e
i n s t a l l e d i n t he
servo
pressure vacuum i ne s
t o
t he p r i -
mary out f l ow val ve and
cabi n safety
val ve t o l i m t
cabi n
af t i t ude t o
11, 500
f e e t shoul d a d i f f e r e n t i a l
r e l i e f
val ve
f a i l
and
a l l ow
t he
pr i mar y
out f l owval ve or cabi n
s a f e t y
val ve t o r emai n
open
Shoul d
t he cabi n
al -
t i t ude
reach
11, 500 f e e t t he
a l t i t u d e l i m t e r s wi l l
vent
cabi n
pressure
t o
t he
pr i mar y out f l ow
val ve
and cabi n s a f e t y
val ve control
chamber s
causi ng
t he
val ves
t o
c l o s e
Shoul d
a
r api d descent
cause
a
negat i ve
pressure i n t he cabi n, both t he
pr i mar y
out f l ow
val ve
and
cabi n
safety
val ve
w i l l open t o vent ambi ent at mospher i c pressure t o
t he
cabi n
EMERGEN YPRESSURI ZATI ON
I n t he event of nor mal cabi n a i r f l ow
mal f unct i on,
emer gency pressur-
i zat i on i s pr ovi ded by r out i ng
engi ne bl eed a i r
d i r e c t l y
i n t o t he
cabi n
t hr ough
t he emer gency pr essur i zat i on val ves
Emergency
pr essur i za-
t i o n
i s accompl i shed aut omat i cal l yby
pr essur i zat i on
aner oi d sw t ches
whent hecabi n
a l t i t u d e i ncr eases
t o
9500
250
f e e t
or
manual l y
by
s e t -
t i ng t he BLEED
AIR
sw t ches t o EMERTheemer gency pr essur i zat i on
val ves wi l l
open, t he bl eed- ai r
shutoff /pressure
r egul at or val ve
wi l l go
t o t he l ow- pr essur e s e t t i n g duct i ng
engi ne
l ow- pr essur e
bl eed
a i r d i -
r e c t l y i n t o t he cabi n a i r
si dewal l
andf l o o r d i f f u s er s
Thi s bypasses t he
condi t i oned
a i r
pl umbi ng i n t he
t a i l c o n e
areato maxi m ze
t he
i nf l ow
of
bl eed
a i r
t o t he
cabi n
Theemer gency pr essur i zat i on val ves ar e deener -
gi zed
t o t he open
pos i t i on f or
emer gency a i r f l ow, andener gi zed
cl osed
f or
nor mal
bl eed- ai r
f l ow
Each
val ve
i s
i ndependent
of
t he ot her and,
whenever
bot h val ves ar e
open,
t emper at ur e control and
bl eed
a i r f o r
w ng, andw ndshi el d a nt i - i c e wi l l be unavai l abl e Oper at i ng power f o r
emer gency
val ve
act uat i on
i s
28
VD uppl i ed t hr ough
ei t her t he
7 5 -
ampL
and
REMERPRESSc i r c u i t br eaker s on t he p i l o t s
and c o p i l o t s
c i r c u i t
br eaker panel s Power f o r emer gency
val ve act uat i on
i s a v a i l -
abl e dur i ng EMER
BUS
mode
6-20
PM 121
Change
3
-
7/26/2019 Lear 1A Anti Ice and Environmental
24/45
e a r j e t
3 A
PM 2
Or i gi nal
vkvF
SOFHd~
mi F
SivrKVOar
PRESSURZ TIONSYSTEMS HEM TI
Fi gure
6 9
P i l o t s Manual
6 2
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L ea r j e t
A
PRESSURI Z TI ON
ONTROLS
N
NDC TORS
BLEED I RSWTCHES
The
L
and
R
BLEED
IR
swi t ches, l ocat ed
on
t he
c o p i l o t s
swi t ch panel ,
cont r ol t he respect i ve l e f t and
r i ght
bl eed- ai r shut of f
/pressure
r egul a-
t o r
val ves
on t he engi ne and l e f t and
r i g ht
emer gency pr essur i zat i on
val ves i n t he
bl eed a i r duct i ng
Each BLEED
I R
swi t ch has t hr ee pos i -
t i ons
EMER ON and
OFFWen
a
BLEEDIRswi t ch i s
i n t h e
ONo-
s i t i o n ,
t he r espect i ve bl eed- ai r
shut of f / pr essur e
r egul at or val ve wi l l
openandt he emer gency
pr essur i zat i on
val ve
wi l l
r emai n cl osed unl ess
t he 9500- f oot
emergency
pr essur i zat i on
aner oi d swi t ches
ar e act i vat ed
WenaBLEED
IR
swi t ch
i s s e t
t o
OFF,
t he r espect i ve bl eed- ai r shut -
of f /p ressure r egul at or
val ve
wi l l
be
ener gi zed
t o
t he
cl osed
pos i t i on
Wen
aBLEED IRswi t ch i s s e t t o
EMER
t he
r espect i ve
bl eed- ai r
shut of f / pr essur e
r egul at or
val ve
wi l l suppl y
l ow- pr essur e
bl eed
a i r
and
emer gency pr essur i zat i on
val ve wi l l
be de- ener gi zed
open The
bl eed- ai r
shut of f / pr essur e
r egul at or
val ves
control
bl eed
a i r f l o w
t o t h e
cabi n a i r d i s t r i b u t i o n and t emper at ur e
control
system
wng
a n t i - i c e
system
and
wi ndshi el d a n t i - i c e syst em
The
bl eed- ai r shut of f /pressure
r egul at or
val ves wi l l c l o s e
aut omat i cal l ywhenever
t he r espect i ve
ENG
FI RE
PULL
T
handl e
i s
pul l ed
Bl eed- ai r f or
wi ndshi el d
al cohol
t ank
pr essur i zat i on i s
s t l l
avai l abl e
wi t h
t he
shut of f / pr essur e
r egul at or
val ves
cl osed
TheBLEED IRswi t ches
r emai n
e f f e c t i v e
dur i ng
EMER
BUS
mode
BLEED I R
W RNNG
LI GHTS
RedBLEEDI R
L
and
BLEED
IR
Rwar ni ng l i g h t s
on
t he gl ar eshi el d
annunci at or
panel ,
pr ovi de
t he
cr ew wi t h
vi sual
i ndi cat i on of a
pyl on
over heat
condi t i onor
pyl onbl eed
a i r
duct i ng
over heat condi t i on
Each
l i g h t i s
oper at ed by
a t her mal swi t ch i n t he associ at ed
pyl on
bl eed- ai r
duct i ng or
a
t her mal swi t ch i n t he associ at ed
pyl on
j u s t
af t of t he f o r -
ward engi ne
mount
The
duct i ng t her mal
swi t ches
c l o s e
t he duct
t emper at ur e shoul d
reach
645 10 F 34 1 [S 5 ] C ) The
pyl on
t her mal
swi t ches
wi l l
i l l umnat e the
r espect i ve l i g h t i f
t he t emper at ur e i n
a
py-
l on exceeds
250 5 F
121
[ 2. 7 ] C )
The
swi t ches
wi l l openand
t he a f -
fected BLEEDIR
Li ght
wi l l ext i ngui sh as t he
pyl on
cool s
6- 22
PM 121
Change
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L ea r j e t
A
P i l o t s
Manual
C BAI R
SWTCH
TheC B
AIRswi t ch on t he
pr essur i zat i on cont r ol panel cont r ol s
t he
c abi n a i r
f l o w
control val ve
and
t he
pr essur i zat i on system
cabi n
safety
val ve
Dur i ng gr ound
oper at i on
when
t he
CAB
AIRswi t ch
i n
t he
OFF
p o s i t i o n
t he nor mal l y cl osed
vacuumshut of f sol enoi d ener
gi zed
open
t hr ough
r el ays
i n t he squat swi t ch
r e l a y
panel
andr egul at ed
vacuum r om
t he
pr essur i zat i onvacuum
egul at or
w i l l open
t he
cabi n
safety
val ve When
t he C BAIRswi t ch i s s et ON
t he vacuumshut of f
sol enoi d de ener gi zed
al l owi ng t he
safety val ve
t o dr i ve cl osed un
der
i ncr easi ng cabi n
pressure
C B
AI R
LIGHTOPTIONAL
Anamber
CABAIR i ght
may
be
i n s t a l l e d on t he gl ar eshi el d
annunci
a t o r panel whi ch
i l l umnat es when t he C B
AIRswi t ch i s
i n t he
OFF
pos i t i on Thi s l i g h t
serves
t o
r e mnd
c re w
members t o swi t ch C B
AIR
on
pr i or t o t akeof f
PRESSURIZATION
UTOM NSWTCH
The
UTOM N
swi t ch
on
t he pr essur i zat i on cont r ol panel
pr ovi des
aut omat i c
andmanual
mode
s e l e c t i o n
f or nor mal pr essur i zat i on When
t he swi t ch
i s s e t t oMAN, sol enoi d val ves
i n t h e r egul at edvacuumi ne s
ar e ener gi zed
t o
remove
r egul at ed vacuum
f r o m
t he
CABINCON-
TROLLERandappl y
r egul at ed
vacuum o t he
manual
control
val ve
The
control
val ve
i s manual l y oper at ed by
t he
r edUP-DN
cont r ol l ever
When t he UTOM N
swi t ch i s s e t
t oAUTO t he
sol enoi d
val ves
de
ener gi ze and a l l o w
r egul at ed
vacuum o t he CABINCONTROLLER
f o r
aut omat i c pr essur i zat i on
control
Nor mal l y
t he
UTOM N
swi t ch
r emai ns
i n
t he
UTO
pos i t i on
CABIN
CONTROLLER
W t h t he
C BAIR swi t ch ONand
t he pr essur i zat i on
UTOM N
swi t ch AUTO
t he
CABIN
CONTROLLER, l ocat ed
on
t he
pr essur i za
t i o n
control
panel w i l l aut omat i cal l y control
cabi n a l t i t u d e
The
con
t r o l l e r
senses cabi n
a l t i t u d e and r at e of cl i mb and aut omat i cal l y
modul at es
t he
pr i mar y
out f l ow
val ve
by
r egul at i ng cont r ol
servo
vac
uumpressure
Pr i or
t o t a k eo f f t he
a l t i t u de s el e c t o r
knob
on
t he
f a c e
of
t he c o n t r o l l e r shoul d
be s e t
t o s e l e c t e d
crui s i ng
a l t i t u d e
or
desi r ed
cab
i n
a l t i t u d e
TheRATE
knob
may
be
rotated t o s e l ec t
and
mai nt ai n
a
com or t abl e
pr essur i zat i on
r a t e f o r
ascent or descent For descent
and
l andi ng
t he
a l t i t u d e s e l e c t o r
shoul d
be s e t t o l andi ng f i e l d
el evat i on
PM 121
6 23
Change
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P i l o t s
Manual
L ea r j e t
31A
PRESSURI ZATI ON
M NU L
CONTROLLEVER
UP-DN
Wth
t he C B
AI R
swi t ch ON
and
t he pr essur i zat i on UTOM N
swi t ch
i n
MAN
cabi n
pr essur i zat i on i s
cont r ol l ed
by
t he r ed UP DN
manual
control l ever
on
t he pr essur i zat i on cont r ol panel The l ever
cont r ol s servo vacuum
pressure
t o
t hepr i mar y
out f l owval ve
t hr ough
amanual
control
val ve
As t he l ever i s moved t owar ds UP out si de
s t a t i c a i r
pressure
i s vent ed
t o
t he out f l ow val ve control
chamber
causi ng t he
val ve
t o
open
Whent he l ever i s movedt owar ds
DN
cab-
i n
pressure i s vent ed
t o t he
out f l ow val ve control
chamber
causi ng
t he val ve t odose
CABIN
ALT/ DI FF PRESSG GE
The
cabi n
a l t i me t e r / d i f f e r e nt i a l pressure
gage,
ont he
pr essur i zat i on
cont r ol panel ,
i s vent ed
t o
both out si de a i r pressure
and
cabi n
a i r
pressure The
i ndi cat or
has two
poi nt er s,
each t r a v e l s over a separ at e
cal i br at ed
scal e Thel ar ge
poi nt er sweeps over
t he
out si de
scal e t o
i n-
di cat e
cabi n a l t i t u d e
The
CABI NALT
s c a l e
i s
marked f r o m0 t o
50, 000 f e e t
i n 1000- f oot i ncr ement s
The
smal l poi nt er
sweeps
over t he
i nsi de
s c a l e
t o i ndi cat e
d i f f e r e n t i a l pressure
i n psi
TheD FF
PRESS
scal e i s
marked
f r o m
0
t o
10
psi i n02- psi i ncr ement s
CABINCLIMBI NDCATOR
The
r a t e
of
change i n
cabi n
pressure al t i t ude i s i ndi cat ed i n f e e t per
m nut e
ont heCABI NCLI MB
i ndi cat or l ocat ed
on t he
pr essur i zat i on
control panel
The i ndi cat or f ace i s
marked
f r o m
0
t o 6000 f e e t per
m nut e
i n both UPandDOWNdi r ecti ons The i nst r ument
f unct i ons
si m l ar l y t o t he a i r c r a f t
v e r t i c a l speed
i ndi cat or but i s
vent ed t o
cabi n
pressure
onl y
EMER
PRESS
OVERRDESWTCHES
Emergency pr essur i zat i on
over r i de swi t ches
ar e
pr ovi ded
t o al l ow
takeoffs and
l andi ngs
a t f i e l d el evat i ons hi gher t han t he emer gency
pr essur i zat i onaner oi d swi t ch
s e t t i n gs 9500
[ 15 0 ]
f e e t Theswi t ches
ar e l ocat ed
on
t he
c o p i l o t s
swi t ch panel
and
ar e
l abel ed EMER
PRESS
OVERR DE -
NORM L
LandRWth
t he
swi t ches
i n OVERR DE po-
s i t i o n ,
t he
emer gency
pr essur i zat i on
aner oi d swi t ches ar e
e l e c t r i c a l l y
i sol at ed f r o m t he
emer gency
pr essur i zat i on
val ves
t hus pr event i ng
t he
val ves f r o mopeni ng when t he aner oi d swi t ches a c t i v a t e When
t he
over r i de swi t ches
ar e i n t he NORM L
p o s i t i o n ,
act uat i on of t he
aner oi d swi t ches wi l l open
t he
emer gency
pr essur i zat i on
val ves The
swi t ches wi l l
have
no
e f f e c t
t he BLEED
AIRswi t ches
ar e i n t he OFF
or
EMER
pos i t i on
6- 24
PM 121
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L ea r j e t
3 A
P i l o t s Manual
CASALT
LI GHT
Shoul d t he
cabi n
a l t i t u d e exceed 8750 250
f e e t , an
aneroi d swi t ch
wi l l
cl ose
t o
i l l um nat e t he
amber
C
ALTl i g h t
on
t he
gl ar eshi el d
an-
nunci at or panel
The
aneroi d
swi t ch wi l l a l s o deact i vat e t he
UTO
pr essur i zat i on
mode
t o
stop t he cabi n
a l t i t u d e
f rom
r i s i n g
any
hi gher
t he
mal f unct i on
was i n
t h a t
cont rol
system The
aneroi d swi t chw l l
r e -
s e t a t a l ower
cabi n a l t i t u de ,
r eener gi zi ng t he aut omat i c cont r ol system
andext i ngui shi ng
t he
CABALTl i g h t
CABN
ALTI TUDE
WRNNGHORN
cabi n
a l t i t u d e
aur al
war ni ng hor n wi l l sound t o a l e r t t he crewshoul d
t he cabi n
a l t i t u d e
reach
10, 100 250
f e e t
The
hom
s
cont r ol l ed
by
an
aneroi d swi t ch
whi chwi l l appl y a
gr ound t o t he
warni nghorn
c i r c u i t
when act uat ed The
cabi n
a l t i t u d e
war ni ng
horn
c i r c u i t
i s tested
t hr ough
t he syst em t e s t swi t ch
on
t he
p i l o t s
i nst r ument
panel
The
MUTE
swi t ch on t he
r i g h t
t hrust
l ever
maybe used
t o i nt er r upt t he
hor n
f or
appr oxi mat el y 60
seconds
i n t he
event
t he hor n sounds
The
cabi n
a l t i t u d e
war ni ng hor n i s
operat i ve
dur i ng EMERBUSmode
SYSTEM
TEST
SWTCHC IN
ALT
FUNCTION
The
rotary-type
system t e s t swi t ch on
t he
p i l o t s i nst r ument
panel
i s
used
t o t e s t t he cabi n
a l t i t u d e
war ni ng
system Rot at i ng
t he swi t ch t o
CABNALTanddepr essi ng t he swi t ch PRESSTESTbut t on
wi l l pr o-
vi de a
gr ound
si mul at i ng
t he
10, 100- f oot aneroi d swi t ch
act uat i on
Dur i ng t he t e s t sequence,MUTE
swi t ch
operat i onmay
a l s o be
checked
ARCONDTIONNGND
HE TING
Pr i mar y heat i ng and
cool i ng i s accompl i shed by cont r ol l i ng
t he
t em-
perat ur e
of
t he
bl eed
a i r
ent er i ng t he
cabi n
a i r di str i but i on
syst ems
On
a i r c r a f t 31- 035
thru
31- 190, an R f r eon- based cool i ng syst em i s i n -
s t a l l e d t o
pr ovi de
addi t i onal
cool i ng
a t
a l t i t u de s bel ow
35, 000
f e e t
and
dur i ng ground
operat i ons Ona i r c r a f t
31- 191
and
subsequent , an
R 4A
r ef r i ger ant - t ype cool i ng system i s i n s t a l l e d
t o
pr ovi de
addi t i onal cool -
i ng
An
auxi l i ar y
e l e c t r i c a l )
cabi n
heat i ng systemi s
i n s t a l l e d
t o
pr ovi de
addi t i onal
cabi n
heat i ng,
i f
r equi r ed
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P i l o t s Manual
Lear j et 31A
PRM RY
HE TINGNDOOLNGBLEED R
Cockpi t
andcabi n t emper at ur e i s
r egul at ed
bycont r ol l i ng t he
t emper -
ature of
t he pr essur i zat i on
bl eed
a i r
ent er i ng t he
cabi n
a i r di st r i but i on
system
Wth
t he
BLEED
AI Rswi t ches ON
and
t he
CAB
AI Rswi t ch
ON engi ne
bl eed
a i r i s
a d m t t e d
t o t he rama i r heat exchanger
t hr ough
a f l o w
cont r ol
val ve
The
bl eed
a i r
i s
cool ed
i n
t he
heat
ex-
changer by ram
i r
ent er i ng t he
dorsal
i n l e t passi ng t hr ough t he
ex-
changer ,
and
then e x i t i n g i n t o t he
t a i l c o n e
The
condi t i oned bl eed
a i r
then
passes out
of t he exchanger i n t o t he
cabi n
a i r di st r i but i on duct s
The
t emper at ur e o f t he
condi t i oned
ai r
i s
cont r ol l ed by t he hot
a i r
by-
pass
H)
val ve Thi s
val ve bypasses
some
of
t he
bl eed ai r ar ound
t he
heat exchanger and
mxes
d i r e c t l y wi t h
t he condi t i oned
a i r
exi t i ng
t he
heat
exchanger
H- val ve
p o s i t i o n
t hus,
t emper at ur e
r egul at i on,
i s
cont r ol l ed byt he
pneumat i cal l y oper at ed
t emper at ur e
cont r ol
system
Whenever t he cabi n
t emper at ur e
UTOM Ne l e c t o r knob i s r ot at -
ed
t o AUTO
t he t emper at ur e cont r ol l er wi l l
aut omat i cal l y
mai nt ai n
t he
t emper at ur e
set wi t h
t he t emper at ur e
s e l e ct o r
Wth
t he
mode
se-
l e c t o r i n
UTO
andt he HOT COLDt emper at ur e s e l e c t o r knob s e t
t o
COLD he t emper at ur e
s e l e c t o r
needl e val ve
opens
and r educes t he
pressure t o
t he cabi n
t emper at ur e sensor The
decreased pressure
causes t he
cabi n
t emper at ur e
sensor
bl eed
pat h
t o
open
and
al l ows
t he
sensor t o vent more
of t he pressure t o
ambi ent
The
decr eased
pressure
al l ows
t he H
val ve t o cl os e andr out es bl eed
a i r t hr ough
t he
heat exchanger ,
then
i n t o
t he
cabi n
at a l ower t emper at ur e When t he
t emper at ur e s e l e c t o r
i s
s e t
t o HOTt he
t emper at ur e
s e l e c t o r needl e
val ve
cl oses and
r a i s e s t he pressure t o t he
cabi n
t emper at ur e sensor
The
i ncr eased pr essur e
caus es t he cabi n
t emper at ur e
s ens or bl eed
pat h
t o cl ose
and i ncr eases pressure t o t he
al ve
The i ncr eased
pr es s ur e al l ows t he
H- val ve
t o
openand
bypass
more
hot
a i r
i n t o t he
cabi n
di st r i but i on
system
The
cabi n
t emper at ur e
sensor s
f an
bl ows
cabi n
a i r
acr oss t he sensor, and causes t he sensor t o
met er
more or
l e s s
pressure,
dependi ng
on t he t emper at ur e
of
t he
cabi n
a i r and t he
sel ect ed t emper at ur e The
t emper at ur e sensor
f an
i s
i noper at i ve
when
t he
COOL OFFswi t ch i s s e t t o COOL When t he mode s e l e c t o r i s s e t
t o MAN t he
cabi n
t emper at ur e
sensor and
duct t emper at ur e sensor
ar e
removed
from he system and
t he
pressure
t o
t he H- val ve
i s con-
t r o l l e d
d i r e c t l y by
t he
HOT COLDt emper at ur e s e l e ct o r
Set t i ng t he
t emper at ur e s e l e c t o r t o
COLD
bl eeds of f
a
greater amount of t he reg-
ul at ed
pressure
and
al l ows
t he
H- val ve
t o
route
more
bl eed
a i r
t hr ough
t he
heat
exchanger
Set t i ng t he t emper at ur e
s e l e c t o r
t o HOT
cl oses t he
bl eed
pat h and
i ncr eases t he
pressure
at t he
H- val ve
The
val ve
opens
and
bypasses more bl eed
a i r d i r e c t l y
i n t o t he
cabi n
a i r
di st r i but i on
duct s
6 26
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31A
i l o t s Manual
CA N
DSTRWION
BLEED
AIR
TALCONEBLEEDARDSTRIBUTION
Fi gure 6 10
CABIN
OBTIBBuno
CONDTONED
AIR
PM 121
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Lear j et 31A
C BAI R
SWTCH
The
C BAI Rs wi t c h, l oc at ed
on
t he pr es sur i z at i on c ont r ol panel ,
con-
t r o l s
t he f l o w
control val ve
Wth t he
BLEEDAI R
swi t ches ON s e t -
t i n g
t he
C B
AI R
s wi t c h
ON
wi l l
de- ener gi ze t he
f l o w
control
val ve
cont r ol l i ng
s ol enoi d and
al l ow
systempressure t o
t he val ve s cont r ol -
l i n g chamber s I n t e r n a l
pressures
w i l l pos i t i on t he
val ve
b u t t e r f l y
cont r ol l i ng bl eed
ai r f l o w t o
t he
heat exchanger
Set t i ng t he
C B
AI R
s wi t c h ONal s o ener gi zes
t he c abi n
t emper at ur e
sensor bl ower
S e t -
t i n g
t he
C B
AI R
s wi t ch OFF
wi l l
ener gi ze
t he val ve control
s ol enoi d
whi ch wi l l
shutoff control pressure
and a l l o w
t he val ve
b u t t e r f l y
t o
bl ock
bl eed ai r
f l o w
UTOM N
SELECTOR
An AU PO-MANmode
s e l e c t o r
l ocat ed on t he c o p i l o t s s wi t c h panel ,
pr ovi des
f or aut omat i c
or
manual
mode oper at i on
of t he c abi n
t em
perature
control
system
Wen
i n
UTO
mode
t he
system
t emper a-
t ur e cont r ol l er s
aut omat i cal l y
posi t i on t he
H- val ve
but t er f l y I n t he
M Nmode t he HOT- COLD
s el e c t o r d i r e c t l y
r egul at es t he
H- val ve
cont r ol l i ng
pressure
HOT- COLD
TEMPERATURE
SELECTOR
The HOT- COLD t emper at ur e s e l e c t o r l ocat ed
on
t he
c o p i l o t s
s wi t c h
panel
I n
systemUTOmode
t he
t emper at ur e s e l e c t o r i s used
t o
s e l e c t t he desi r ed
cabi n
t emper at ur e t o be mai nt ai ned
aut omat i cal -
l y
by
t he
t emper at ur e
control
system
I n M N
mode
t he t e