Instructions for Continued Airworthiness G600, GNS 530W, GNS 430W, 190-01080-05 Rev. 2
GMA 347, GTX 330D, GMX 200, WSI AV-200 Cessna 208/208B Page 15 of 29
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 testing process. No configuration is required.
New, Repaired or Exchanged GDU 620 is Installed
If the GDU 620 is replaced with a new, repaired, or exchange unit, 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.
Continue to the GDU 620 Software Loading procedure, followed by the Manifest Configuration and
the Configuration Module Update, located in Section 4 of the appropriate Modification Summary.
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. Refer to Section 4 of the appropriate Modification Summary for more information.
2.7.1.3 Return to Service
After removing and reinstalling the GDU 620 per the instructions above, a simple 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 Appendix A of the appropriate Modification Summary.
2.7.2 GRS 77
2.7.2.1 Removal
1. Gain access to GRS 77 (See General Arrangement Drawing for location)
2. Disconnect the GRS 77 connector.
3. Loosen the four Phillips thumbscrews with a screwdriver.
4. Gently lift the GRS 77 from the mounting plate (if the supports for the mounting plate are
removed, the GRS 77 must be recalibrated).
2.7.2.2 Installation
1. Place the GRS 77 on the mounting plate, ensuring the orientation is correct.
2. Fasten the unit to the plate using the Phillips thumbscrews. Recommended torque is 22-25 inch
pounds.
3. Visually inspect the connectors to ensure there are no bent or damaged pins. Repair any
damage.
4. Connect the connector to the GRS 77, ensuring that each slidelock is secured on both sides.
Original GRS 77 is Reinstalled
If the original GRS 77 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
testing process. Reference Table 2-1 to determine whether recalibration is required.
New, Repaired or Exchange GRS 77 is Installed
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