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190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 7 Page 4-7
NOTE
A bonding test failure may occur if a fastener is not secured to the specified torque value.
For installations that use screws in lieu of rivets to secure the rack to surrounding
structure, verify that the screws are torqued to the appropriate value before proceeding to
remove the rack. See Section 4.4 for torque values.
In the event of bonding test failure, remove the GMA 35 rack and clean the attachment points with a
bonding brush at both the GMA rack and the aircraft attachment points. Re-verify the resistance between
the mounting rack and the instrument panel and ensure that the resistance is less than or equal to 5
milliohms.
5. Reinstall the backplate assembly and reinstall the GMA unit in the mounting rack.
4.5.5 Flight Stream 210 (Metallic or Tube/Fabric Aircraft)
1. Disconnect the shield terminations from the Flight Stream connector backshell.
2. Measure the resistance between the connector and nearby exposed portion of aircraft metallic
structure and check that it is less than or equal to 20 milliohms.
In the event of bonding test failure, remove the Flight Stream connector bonding strap from the aircraft
ground plane and clean the attachment point with a bonding brush. Re-attach the bonding strap to the
aircraft ground plane, torque to 12-15 in-lbs. Re-check the resistance between the Flight Stream
connector and aircraft structure, ensuring that the resistance is less than or equal to 10 milliohms. If
cleaning the far side of the strap is not enough, remove, clean, and reattach on the Flight Stream 210 side.
3. Connect the shield terminations to the Flight Stream connector backshell.
4.5.6 Flight Stream 210 (Composite Aircraft)
1. Disconnect the shield terminations from the Flight Stream connector backshell.
2. Measure the resistance between the connector and instrument panel (or other aircraft ground) and
check that it is less than or equal to 20 milliohms.
In the event of bonding
test failure, remove the Flight Stream connector bonding strap from the aircraft
ground plane and clean the attachment point with a bonding brush. Re-attach the bonding strap to the
aircraft ground plane, torque to 12-15 in-lbs. Re-check the resistance between the Flight Stream
connector and aircraft ground, ensuring that the resistance is less than or equal to 10 milliohms. If
cleaning the far side of the strap is not enough, remove, clean, and reattach on the Flight Stream 210 side.
3. Connect the shield terminations to the Flight Stream connector backshell.