Garmin GTS 8 Series, Maintenance Manual

Page: 20 / 67

190-01279-01 GTS 8XX Part 23 AML STC Maintenance Manual
Rev. 2 Page 4-4
Maintenance Item Interval Description/Procedure
Antenna electrical bonding test
(Not applicable to composite
VFR-only models)
Every 2000 flight
hours or ten years,
whichever is first
An electrical bonding test must be performed on all GTS 8XX system antennas. The test procedure is:
1. Gain access to the antenna.
2. Disconnect the coaxial cable connector(s) from the antenna.
3. Measure the resistance between the antenna coaxial connector body and a nearby exposed portion
of aircraft metallic structure (e.g., exposed rivet on fuselage stringer).
4. Verify the resistance is less than or equal to 10 m Ω .
5. Reconnect the antenna connector(s).
In the event of bonding test failure, perform the following procedure:
1. Remove the antenna, clean, and re-install in accordance with Section 6.
2. Measure the resistance between the antenna coaxial connector body and a nearby exposed portion
of aircraft structure (e.g., exposed rivet on fuselage stringer).
3. Verify the resistance is less than or equal to 2.5 m Ω .
Equipment electrical bonding
test
Following removal
and replacement of
the GTS 8XX install
rack or bonding
components
AND
Every 2000 flight
hours or ten years,
whichever is first
1. Disconnect the coaxial cable connector(s) from the GTS 8XX.
2. Disconnect P8001, P8002, and P8003 connectors from the GTS 8XX.
3. Measure the DC resistance between the GTS 8XX chassis and the aircraft ground, as defined in
Table 2-2. Verify the resistance is less than or equal to the appropriate periodic test resistance value
listed in Table 2-2.
In the event of bonding test failure, perform the following procedure:
1. Remove GTS 8XX and install rack from the aircraft per instructions in Section 6.
2. Ensure that the GTS 8XX and install rack are clean and free of dirt and debris.
3. Ensure that all ground path components are in good condition and properly connected and attached
to the aircraft.
4. Re-install the GTS 8XX and install rack in accordance with Section 6.
5. Measure the resistance between the GTS 8XX chassis and the aircraft ground,
as defined in Table 2-2.
6. Verify the resistance is less than or equal to the appropriate reconditioned resistance value listed in
Table 2-2.
Equipment removal and
replacement
On condition
Remove and replace the GTS 8XX and/or GTS 8XX system antenna.
See Section 6 for equipment removal and re-installation instructions.