Instruction Manual

Instructions for Continued Airworthiness 190-01190-11 Rev. 1
for G500H in Robinson R44 Series Rotorcraft Page 15 of 20
NOTE
The installation configuration settings are stored in the configuration module and will be
retained when the GDU 620 is replaced with a new unit. User settings, such as map
orientation preferences, are stored internally and will be lost when the GDU 620 is
replaced with a new unit.
Original GDU 620 is Reinstalled
If the original GDU 620 is reinstalled, then no software loading is required. This does not include
units that were returned for repair as their software and configuration files are deleted during the
repair process. No configuration is required.
New, Repaired or Exchange GDU 620 is Installed
If a new, repaired, or exchange GDU 620 unit is installed, then software must be loaded. No
configuration is required.
NOTE
Upon first power-up after installing a new GDU 620, it is normal to see a series of
“LOADING…” messages appear on the screen. These messages indicate that the
GDU 620 is updating its configuration settings from the configuration module.
Refer to Section 5 of the G500H STC Installation Manual for the GDU 620 Software Loading
procedure (5.4.1), followed by the Manifest Configuration (5.5.6) and the Configuration Module
Update (5.5.16).
GDU 620 Configuration Module is Replaced
If the GDU 620 Configuration Module is replaced, the GDU 620 will update the configuration module
from its internally-stored settings when the UPDT CFG soft key is pressed If the GDU 620 is
replaced at the same time as the Configuration Module, then the System Setup will need to be
performed per Section 5.5 of the G500H Installation Manual.
2.7.1.3 Return to Service
After removing and reinstalling the GDU 620 per the instructions above, a return-to-service check should
be performed.
1. Power up the GDU 620 and all interfaced systems in normal mode.
2. Verify that there are no red-Xs and that no alerts are present. If red Xs or alerts are present,
troubleshoot using Section 2.6 of this ICA.
2.7.2 GRS 77H Unit
2.7.2.1 Removal
1. Disconnect the GRS 77H connector.
NOTE
Some metal structures of the GRS 77 may become magnetized if closely exposed to
permanent magnets. While this will not affect the GRS 77 itself, it may slightly affect
nearby magnetic instruments in the area (e.g. whiskey compass). Ordinary use of
magnetic screwdrivers to tighten GRS 77 fasteners will not cause problems, but non-
magnetic screw drivers are preferred.