
Page 5-8 G1000 System Maintenance Manual – Diamond DA40/40F
Revision G 190-00545-01
Table 5-2. System Failure Troubleshooting (Cont)
Invalid Data Field
Associated
LRU(s)
Solution
HDG FAIL
GRS 77 &
GMU 44
Ensure metal objects (tool boxes, power carts, etc.) are not
interfering with the magnetometer and aircraft is not in hangar or
near buildings.
Ensure that a cell phone or a device using cell phone technology
is not turned on (even in a monitoring state) in the cabin.
Cycle power, after moving aircraft away from metal objects, to
determine if metal objects were the source of the problem.
Ensure GRS 77 and GMU 44 connectors are secure.
Check the wiring and any inline connectors between the GRS
and GMU for faults.
Perform a Magnetometer Interference Test to check for
interference from onboard electrical system components (e.g.
NAV lights). Pay particular attention to any new electrical
devices that have been installed since the aircraft was new.
Correct any discrepancies that do not allow this test to pass
before continuing.
Recalibrate the GMU 44
Load configuration files to the PFD, MFD, GIA1, and GIA2:
If problem persists replace the GRS 77 with a known good unit:
9 If problem persists, replace defective GMU 44.
9 If problem persists, replace the GRS 77.
GRS 77 &
GMU 44
This message is normal for approximately one minute after initial
powerup.
Ensure that a cell phone or a device using cell phone technology
is not turned on (even in a monitoring state) in the cabin.
Ensure GPS has acquired at least four satellites, has a 3D
navigation solution, and a DOP of less than 5.0.
If this message persists, see section 5.13.
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