Garmin Diamond DA 40 Maintenance Manual page 127

8. Initiate the AHRS engine run-up vibration test procedure by performing the following steps:
a) Select the ENGINE RUN-UP TEST procedure and press the ENT key.
b) Follow the checklist items displayed on the PFD, and press the ENT key as each step is
completed or confirmed.
c) When the CALIBRATE field is blinking, press the ENT key to begin the procedure.
9. The PFD instructs the operator to gradually increase power from idle to full throttle and back to
idle over a period of 2-4 minutes.
10. When the operator has completed the engine run-up and the engine is back to an idle setting,
press the ENT key to indicate that the process is complete. When this is done, the TEST
COMPLETE field stops blinking.
11. The PFD informs the operator if the installation has passed or failed the vibration test. If the test
fails, the specific measurements causing the failure are identified and numeric values are
displayed on the PFD.
12. Press the ENT button on the PFD to conclude this procedure.
If failures are indicated, the engine run-up test may be repeated once or at most twice. If the test does not
pass after three attempts, then the installation should not be considered reliable until the source of the
vibration problem is identified and remedied. In the event of repeated failure of the engine run-up test,
record the values that are reported to be out of range for future reference.
The following are potential causes for failure of the engine run-up test:
a) Vibration motion of GRS77 and/or GMU44 caused by neighboring equipment and/or
supports.
b) Mounting screws and other hardware for GRS77 and/or GMU44 not firmly attached.
c) GRS77 connector not firmly attached to unit.
d) Cabling leading to GRS77 or GMU44 not firmly secured to supporting structure.
e) An engine / propeller that is significantly out of balance.
7.7.7 GRS/GMU Test
The aircraft can now be taxied back and the engine can be shut down for final checkout.
When the PFD powers up in normal mode, the AHRS attitude and heading information displayed should
become valid within 1 minute of power-up. This confirms that the GRS 77 and GMU 44 work correctly.
If no other service is to be performed, continue to the return-to-service checks in Section 8.
G1000/DA 40 System Maintenance Manual
190-00303-03
Page 7-33
Revision 6