Garmin GTN6XX User Manual
190-01007-A1
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 7
Page 6-23
6.11 WXR HSDB Cable Overbraid
The following removal and replacement steps are provided as guidance for replacing the cable overbraid
assembly. The overbraid assembly drawing is shown in Figure 6-13.
assembly. The overbraid assembly drawing is shown in Figure 6-13.
Removal
1. Remove the radome to gain access to the GWX radar.
2. Disconnect the cable connector at the weather radar.
3. At the other end of the overbraid, disconnect the terminal ground lug from the bulkhead.
4. Remove the electrical tie-down strap.
5. Remove the backshell from the GWX weather radar connector.
6. Unpin the necessary cables from the GWX connector and pull the overbraid off of the wire.
3. At the other end of the overbraid, disconnect the terminal ground lug from the bulkhead.
4. Remove the electrical tie-down strap.
5. Remove the backshell from the GWX weather radar connector.
6. Unpin the necessary cables from the GWX connector and pull the overbraid off of the wire.
Replacement
NOTE
The length of overbraid required is approximately equal to the length of the WXR cabling
in the radome area (measured from the bulkhead to the WXR R/T connector) plus 6".
in the radome area (measured from the bulkhead to the WXR R/T connector) plus 6".
1. If any of the cables’ insulation shows signs of damage, replace the cable(s).
2. Slide the new overbraid over the HSDB cabling from the WXR R/T to the bulkhead.
3. At the bulkhead end of the overbraid, comb out a maximum of two" of braid, twist it, cut to length
2. Slide the new overbraid over the HSDB cabling from the WXR R/T to the bulkhead.
3. At the bulkhead end of the overbraid, comb out a maximum of two" of braid, twist it, cut to length
if necessary, and terminate with a MS20659-131 5/16” terminal lug.
4. With a NASM970-516 (AN970-516) washer between the terminal lug and bulkhead, secure the
terminal lug to the existing bulkhead location.
5. At the WXR R/T end of the overbraid, fold one" of overbraid back over itself. Position the
overbraid so that the fold will lie under the backshell cover plate, while the overbraid ends will lie
just outside the strain relief bar.
just outside the strain relief bar.
6. Re-pin the cables to the WXR connector and reinstall the backshell cover plate and strain relief
bar.
7. Verify overbraid terminal bonding by checking the resistance between the overbraid and the
bulkhead. The resistance should be less than 2.5 m
Ω.
CAUTION
All overbraid ends must be secured outside the backshell by the strain relief bar (Refer to
Figure 6-13). Failure to do so may allow the overbraid ends to contact and short HSDB
pins, resulting in weather radar malfunction or damage.
Figure 6-13). Failure to do so may allow the overbraid ends to contact and short HSDB
pins, resulting in weather radar malfunction or damage.