Overhaul Period; Special Inspection Requirements; Application Of Protective Treatments - Garmin G600 Maintenance Manual

3.7 Overhaul Period

The system does not require overhaul at a specific time period. Power on self-test and continuous BIT
will monitor the health of the G500/G600 TXi system. If any LRU indicates an internal failure, the unit
may be removed and replaced. See

3.8 Special Inspection Requirements

After a suspected lightning strike, the following actions must be performed for the specified LRU:
GTP 59 OAT
Inspect the GTP 59 OAT for signs of lightning damage. Check the self-sealing washer (P/N 212-00026-00)
used on the probe tip outside of the aircraft for any evidence of melting or lack of seal. Replace washer if
damaged. If there is evidence of lightning strike to the OAT or any lightning damage, replace the GTP 59
OAT.
Tube and fabric aircraft must replace the OAT bond strap (if installed) in accordance with Section 4.6.2 of
the G500/G600 TXi Part 23 AML STC Installation Manual.
GMU 44
Aircraft with a GMU mounted in the wingtip of metallic aircraft with non-metallic wingtip covers must
inspect the magnetometer installation for the following conditions:
• Check the GMU 44 magnetometer body and mount for scorching, soot, melting, pitting, denting,
or discoloration.
• Check P441 and J441 for melting or pin damage.
• Check the cable overbraid for pinching, melting or evidence of arcing.
• Check the lug for evidence of arcing and verify that the lug is still secured to the overbraid.
• Check electrical bonding between the GMU 44 overbraid and adjacent aircraft structure.
Resistance should be less than 5 mΩ.
• If any of these checks shows evidence of a lightning strike, replace the overbraid assembly in
accordance with Figure 4-54 of the G500/G600 TXi Part 23 AML STC Installation Manual.
Perform the magnetic interference check in accordance with Section 6.6.4 of the G500/G600 TXi Part 23
AML STC Installation Manual. The purpose of this check is to ensure the structure around the GMU 44
did not get magnetized by the lightning event to the point of affecting GMU 44 performance.
GBB 54 Battery Vent Tube
Aircraft with a GBB 54 battery must inspect the battery vent tube using the following procedure:
1. Gain access to the GBB 54 and both ends of the vent tube.
2. Check the battery vent grounding strap for evidence of arcing or damage.
3. Check the end of the vent tube that protrudes through the aircraft skin for scorching, soot, melting,
pitting, denting, or discoloration.
If any of these checks show evidence of a lightning strike, replace the vent tube and grounding strap in
accordance with Section 4.5.6 of the G500/G600 TXi Part 23 AML STC Installation Manual.

3.9 Application of Protective Treatments

None.
190-01717-B1
Rev. 1
of this document for fault
G500/G600 TXi Part 23 AML STC Maintenance Manual
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