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 17 of 29
changed. If the magnetometer mount was changed, refer to Section 4 of the appropriate Modification
Summary for the GRS 77/GMU 44 Magnetic Calibration.
New, Repaired or Exchange GMU 44 is Installed
If the GMU 44 was replaced with a new, repaired, or exchanged unit, then software must be loaded
and the GRS 77/GMU 44 Magnetic Calibration must be performed. Refer to Section 4 of the
appropriate Modification Summary for more information for instructions on loading software and
Magnetic Calibration.
2.7.3.3 Return to Service
After removing and reinstalling the GMU 44, the following return-to-service checks should be performed.
1. Power up the G600 system with the GDU 620 in normal mode.
2. Verify that the GDU displays valid heading within approximately one minute.
NOTE
The heading can remain invalid if the magnetometer is near a large metal structure such as a hangar
wall or if the magnetometer is close to a large ground power cart.
3. Verify that no unexpected alerts are present. If alerts are present, troubleshoot using Appendix A
of the appropriate Modification Summary.
2.7.4 GDC 74A
2.7.4.1 Removal
1. Gain access to the GDC 74A (see General Arrangement Drawing for location)
2. Disconnect the pitot/static plumbing from the rear of the unit. Disconnect the single connector.
3. Loosen each thumbscrew on the hold-down clamp and remove the clamp.
4. Carefully remove the unit from its mount.
2.7.4.2 Installation
1. Place the unit in the mounting tray.
2. Position the locking clamp and fasten using the thumbscrews.
3. Connect the pitot/static plumbing.
4. Inspect the connector and pins for damage. Repair any damage.
5. Connect the connector to the unit, ensuring that each slidelock is secured on both sides.
Original GDC 74A is Reinstalled
If the original GDC 74A is re-installed, 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.
New GDC 74A is Installed
If the GDC 74A is replaced with a new, repaired, or exchange unit, then software must be loaded to
the unit. Refer to Section 4 of the appropriate Modification Summary for more information.
GDC 74A Configuration Module is Replaced
If the GDC 74A Configuration Module is replaced, the GDC 74A must be configured. Refer to Section
4 of the appropriate Modification Summary for more information.
2.7.4.3 Return to Service
After removing and reinstalling the GDC 74A, the following return-to-service checks should be performed.
1. Power up the G600 system with the GDU 620 in normal mode.
2. Verify that the GDU displays valid air data within approximately one minute.
3. Verify that no unexpected alerts are present. If alerts are present, troubleshoot using Appendix A
of the appropriate Modification Summary.
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