CHAPTER 97
AVIONICS
97-10 Garmin G500H Electronic Flight Instrument System (EFIS) Installation
The Garmin G500H is an integrated avionics display system that provides flight instrument,
moving-map navigation, and additional situational awareness information to the flight crew
via the Garmin GDU 620 Display.
NOTE
Refer to Garmin G500H Instructions for Continued Airworthiness.
97-11 LRU Installation – GDU 620 Display
Refer to § 95-70 for Garmin GDU 620 Display maintenance procedures.
97-12 LRU Installation – GDC 74H Air Data Computer
Refer to R66 Illustrated Parts Catalog (IPC) Figure 97-5.
A. Description
The GDC 74H Air Data Computer (ADC) compiles information from the pitot-static
system and an Outside Air Temperature (OAT) sensor. The GDC 74H computer
provides pressure altitude, airspeed, vertical speed, and OAT information to the G500H
EFIS system. The GDC 74H computer communicates with the GDU 620 Display and
GRS 77H AHRS using an ARINC 429 digital interface.
B. Schematic
Refer to MM Figure 98-10 for GDC 74H Air Data Computer Installation electrical
schematic.
C. Removal
1. Turn battery & avionics switches off and pull out EFIS (5 amp) circuit breaker at
panel.
2. Hinge left seat forward and remove F748-1 cover assembly.
3. Disconnect airframe harness from GDC 74H air data computer at connectors.
4. Disconnect pitot and static tube fittings from computer and plug fittings.
5. Remove screws securing computer to F950-2 support assembly. Carefully remove
computer from under left seat.
MAY 2015 Chapter 97 Avionics Page 97.1
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