Instruction Manual

G500/G600 PFD/MFD System 190-00601-00 Rev. L
Instructions for Continued Airworthiness Page 8 of 14
Within the preceding 12 calendar months, proper operation of the attitude instrument must be verified
with the following procedure:
1. Apply aircraft power to the unit and verify that the invalid flag is removed from view and the
STBY PWR indicator is not illuminated.
2. Remove aircraft power from the unit and verify that the invalid flag is not visible and the STBY
PWR indicator is flashing.
3. Press the STBY PWR button and verify that the invalid flag is not visible and the STBY PWR
indicator is not flashing.
4. Press the STBY PWR button a second time and verify that the invalid flag is displayed.
Otherwise maintenance of the Mid-Continent Instruments attitude indicator is ‘on condition’ only.
2.5.10 Electrical Bonding Test
G500/G600 LRU electrical bonding must be tested every 2000 flight hours or ten (10) years, whichever
is first. During the test, any cables normally attached to the LRU must be disconnected from the LRU. If
measured resistance is greater than applicable values in the following table, bonding must be improved
to meet applicable requirements for a new installation in accordance with section 3.8 of the G500/G600
AML STC Installation Manual.
LRU
Metallic Aircraft
Non-Metallic Aircraft
GDU 620 – Display Unit
40 mΩ (to instrument panel)
40 mΩ (to instrument panel)
GRS 77 – Attitude, Heading
Reference System (AHRS)
20 mΩ (to aircraft ground
plane)
20 mΩ (to instrument panel)
GMU 44 – Magnetometer
20 mΩ (to aircraft ground
plane)
No bond check required since
the GMU is required to be
isolated from its mounting
location. Verify that there is
sufficient clearance around the
installation per section 2.5.11.5.3
of the G500/G600 AML STC
Installation Manual
GDC 74( ) – Air Data Computer
20 mΩ (to aircraft ground
plane)
20 mΩ (to instrument panel)
GTP 59 – OAT Probe
5 mΩ (to aircraft skin)
No bond check required since
the GTP is required to be
isolated from its mounting
location. Verify that there is
sufficient clearance around the
installation per section 2.5.11.7.2
of the G500/G600 AML STC
Installation Manual
GAD 43/43e – Adapter
20 mΩ (to aircraft ground
plane)
20 mΩ (to instrument panel)
Note: there are no applicable bonding requirements for the Mid-Continent Instruments Attitude Indicator
Models 4300-4( ), or 4200-( ) with MD420.