JSWAG Coordinatorjswag@navy.mil

The Spr ing JSWAG/JAvFOWG Technical Interchange Meeting is scheduled for April 6-9, 2020 in Phoenix, Arizona. For more information, please email jswag@navy.mil.

Announcements

• The Wiring Awareness (806881), Fiber Optic Awareness (806707) and Joint Service Wiring Manual Main-tenance Techniques (806994) DVDs can be ordered by calling 888-743-4662 or by submitting a ticket at http://www.dimoc.mil/customer/con-tact.html

• Heatless Splice ApplicationVideo- https://www.youtube.com/watch?v=Op1YMaz454E&feature=youtu.be

• MIL-HDBK-522A- Guidelines for Inspection of AircraftWiring Intercon-nect Systems http://quicksearch.dla.mil/qsDocDetails.aspx?ident_num-ber=277535

• MIL-HDBK-525- ElectricalWiring Interconnect System (EWIS) Integri-ty- http://quicksearch.dla.mil/qsDoc-Details.aspx?ident_number=279725

• Need help locating information on connectors, contacts or accessories? If so, email us at jswag@navy.mil.

Resources

Newsletter Contact

NAVAIR Public Release 2020-25. Distribution Statement A- “Approved for public release; distribution is unlimited.”

Tool-less Shield Termination Data analysis shows that the most common area for wiring damage is within twelve inches of the connector. Wiring repairs on shielded harnesses are very common repairs. To affect these repairs, the shield has to be removed by cutting off the existing shield termination band (M85049/128™) and sliding the shield back to access the wiring behind the connector (Figure 1). The NAVAIR Wiring Systems Team worked with industry partners using a Cooperative Research and Development Agreement, to develop and test a new tool-less shield termination band for the most typical shield termination connector backshells. As a result of these efforts, the Mil-Dtl-32628 and the Mil-Dtl-32628/01 specifications were published. They define a spring band which is reusable, installed and removed without special tools and meets the performance requirements of the SAE AS85049/128™ one-time use shield termination band. The M32628/01 spring band incorporates a tri-dent feature which facilitates installation and removal (Figure 2).

Unlike the legacy one-time use band the new M32628/01 has a part number etched on for easy identification (Figure 3). The four size bands (M32628/01-10 thru -13) cover all shell sizes of common circular connector backshells in SAE 85049/82™ thru /90™. These EMI/RFI backshells employ the standard .25 inch wide banding platform for shield termination (Figure 4).

Figure 1. Typical/Legacy EMI/RFI Shield Termination Configuration

Figure 2. M32628/01 Shield Termination Spring Band

Figure 3. M32628/01 Spring Band Marking Figure 4. M32628/01 Installed Shield Termination Spring Band

JSWAG Newsletter / Volume 11, Issue 2

JSWAG Newsletterhttp://www.navair.navy.mil/jswag

Fall 2019 Edition Vol. 11, Issue 2

Find the Answer Current Question: TRUE/FALSEIf resistance is felt while de-pinning a connector using contact removal tool, you should forcibly press the tool into the connector.Resource: NA 01-1A-505-1 WP 20 Figure 34Answer will be provided in next Newsletter publication

Previous Question: TRUE/FALSEBefore isolating and correcting the fault, a tripped circuit breaker should be set and attempt to duplicate the discrepancy.Answer: FALSE. WARNING: Failure to ensure that the system is serviceable and without wiring faults prior to closing any circuit breaker may lead to system damage, fire, loss of aircraft and/or personnel injury or death. Reference: NA 01-1A-505-1 WP 028 00 para. 46.b

In addition to the minimum mechanical and electrical performance requirements, the new M32628/01 spring band was also vibration tested as installed on and meeting requirements defined in AS50151™, Mil-Dtl-38999 connectors and SAE AS85049™ circular connector accessories. These tests subjected various connector shell sizes two eight hours of vibration in two axis each. The spring bands retained the shield, were not damaged and had the same or better electrical performance then before the vibration tests.

The installation and inspection procedures have been developed verified, and recently published in the joint service maintenance manual (NA 01-1A-505-1, in WP 011 01). Before the M32628/01 spring is installed, it is first uncoiled (Figure 5).

To ensure a good form-fit and necessary performance, the M32628/01 is installed after the metallic over-braid shield is compressed/formed on top the connector accessory banding platform. Then the spring band is coiled onto the backshell and excess braid is trimmed off (Figure 6).

Figure 5. M32628/01 Tri-Dent Spring Band Preparation Figure 6. M32628/01 Tri-Dent Spring Band Installation * Some images courtesy of Isodyne Inc.

JSWAG Newsletter / Volume 11, Issue 2