
G1000 System Maintenance Manual – Diamond DA40/40F Page 5-7
190-00545-01 Revision G
Table 5-2. System Failure Troubleshooting (Cont)
Invalid Data Field
Associated
LRU(s)
Solution
TAS FAIL
AIRSPEED FAIL
ALTITUDE FAIL
VERT SPEED FAIL
GDC 74A
Inspect GDC 74A pitot/static plumbing integrity.
Inspect pitot/static ports and associated equipment.
For TAS failure, also check GTP 59 OAT probe as stated below.
Check GDC ARINC 429 configuration settings for the PFD, MFD,
GIA1, and GIA2.
9 If PFD, MFD, and GIA configuration settings are correct,
replace defective GDC configuration module according to
Section 6.8.
9 If problem persists, replace defective GDC 74A.
OAT
GTP 59
See above guidance for GDC 74A troubleshooting.
Check GDC config module wiring for damage, replace if any is
found.
Replace GDC 74A with a known good unit:
9 If problem persists replace defective GTP 59A.
ATTITUDE FAIL
GRS 77
Ensure the GRS 77 is fastened down tightly in it’s mounting rack
and that the mounting rack is not loose (CAUTION - do not
loosen the mounting rack hardware to the airframe shelf or the
aircraft will need to be re-leveled and the PITCH/ROLL OFFSET
procedure performed).
Ensure GPS has acquired at least four satellites, has a 3D
navigation solution, and a DOP of less than 5.0. This is
particularly important for an ATTITUDE FAIL that appears during
ground operation only.
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 to restart initialization.
Load configuration files to the PFD, MFD, GIA1, and GIA2
Ensure GRS connecter is secure and proper wire harness strain
relief is provided.
Perform an Engine Run-Up Test to check if engine vibration is
causing the GRS 77 to go offline.
Calibrate the GRS 77 (Pitch/Roll Offset and Magnetometer
Calibration):
9 If problem persists, replace defective GRS 77 and GRS
77 configuration module.
Contact Garmin Aviation Product Support if condition continues
after replacing the GRS 77 and config module for additional
assistance.
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