G500/G600 PFD/MFD System 190-00601-00 Rev. L
Instructions for Continued Airworthiness Page 7 of 14
2.5.2 Aluminum Foil Tape (non-metallic aircraft only)
Any aluminum foil tape used in the G500/G600 installation (see section 3.1 of this document) must be
inspected every 12 calendar months in accordance with section 8.3.2 of the G500/G600 AML STC
Installation Manual.
2.5.3 GDU 620 – Display Unit
Maintenance of the GDU 620 is ‘on condition’ only.
2.5.4 GRS 77 – Attitude, Heading Reference System (AHRS)
The GRS 77 utilizes an Earth magnetic field model which is updated once every five years as part of the
Aviation Database maintained by the owner/operator. If the magnetic model is not up to date, the unit will
issue an alert upon startup indicating the model has expired. The model can be updated in accordance
with the database update section of the G500/G600 AML STC Installation Manual.
Otherwise maintenance of the GRS 77 is ‘on condition’ only.
2.5.5 GMU 44 – Magnetometer
Maintenance of the GMU 44 is ‘on condition’ only.
2.5.6 GDC 74( ) – Air Data Computer
Test according to Title 14 CFR §§ 91.411 and 91.413 as well as 14 CFR §§ 43 Appendix E. See the
pitot-static checkout procedure in Section 5.8.2 of the G500/G600 AML STC Installation Manual for the
testing procedure.
2.5.7 GTP 59 – OAT Probe
Maintenance of the OAT Probe is ‘on condition’ only.
2.5.8 GAD 43/43e – Adapter
Maintenance of the GAD 43/43e is ‘on condition’ only.
2.5.9 Mid-Continent Instruments Attitude Indicator Models 4300-4( ), or 4200-( ) with MD420
If a Mid-Continent Instruments Attitude Indicator is installed as part of the G500/G600 AML STC, the
battery pack must be tested by one of the following means:
1. Manual:
a. Disconnect the battery pack from the Attitude Indicator.
b. Ensure the battery pack is completely charged and at or near room temperature.
c. Connect the battery to a load of 90 ohms (rated for 10 watts) for 60 minutes while
monitoring the battery voltage level.
i. If the battery voltage is at or above 15.0 volts while under load at the end of the
60 minute test, the battery may be recharged in accordance with the
Mid-Continent Instruments Installation Manual and re-installed in the aircraft.
ii. If the battery voltage is below 15.0 volts while under load at the end of the 60
minute test the battery must be replaced.
2. Automatic:
a. Use the Mid-Continent Instruments Battery Charger/Tester P/N 36029 to test the
battery.
i. If the time required for discharge is 60 minutes or greater, the battery may be
recharged in accordance with the Mid-Continent Instruments Installation Manual
and re-installed in the aircraft.
ii. If the time required for discharge is less than 60 minutes, the battery must be
replaced.
****WARNING****
The battery may be permanently damaged if it is left in a discharged state.
Recharge a discharged battery as soon as possible and
maintain with a float charge for maximum battery life.
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