SUPPLEMENT SG-3
CHAPTER 05 – INSPECTION PROGRAM
CHAPTER 5 – TIME LIMITS AND MAINTENANCE
SCHEDULE
The system does not require overhaul at a specific time period. Power on self‐test and con-
tinuous built-in tests monitor the health of the system. If any LRU indicates an internal fail-
ure, check the LRU. Removal and replacement of all LRUs is on condition of failure only.
5.1 SPECIAL TOOLS
No special tools are required for maintenance.
5.2 CLEANING
The front bezel, keypad, and display of the GDU 620 can be cleaned with a soft cotton cloth
dampened with clean water. DO NOT use any chemical‐cleaning agents. Care should be
taken to avoid scratching the surface of the display.
5.3 GDC 74A AIR DATA COMPUTER
Other than for regulatory testing pertaining to Part 43 Appendix E and F, (Pitot/Static leak
test as described in Part 91.411) maintenance of the GDC 74A is on condition of failure on-
ly.
5.4 GDU 620 DISPLAY UNIT
Maintenance of the GDU 620 is on condition of failure only. For regulatory periodic func-
tional checks, refer to approved aircraft maintenance manuals or manual supplements for ac-
tual aircraft maintenance requirements.
5.5 GRS 77 ATTITUDE, HEADING REFERENCE SYSTEM (AHRS)
Maintenance of the GRS 77 is on condition of failure only.
5.6 GMU 44 MAGNETOMETER
Maintenance of the GMU 44 is on condition of failure only.
5.7 GTP 59 OAT PROBE
Maintenance of the OAT Probe is on condition of failure only.
For Garmin equipment installed, make also reference to applicable maintenance
instructions addressed on the Component Maintenance Manual (CMM):
Maintenance of Garmin IFDS components, at LRU level, is “on condition” only,
unless differently stated.
G500 AML STC Installation Manual
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