
Page 7-32 G1000 System Maintenance Manual – Diamond DA40/40F
Revision G 190-00545-01
7.7.2.4 Procedure D: Engine Run-Up Vibration Procedure
Calibration Procedure D must be performed in order to guarantee that the AHRS mounting is sufficiently
rigid and insensitive to vibration.
Figure 7-15. GRS/GMU Calibration Page
1. 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 one is
completed or confirmed. When the CALIBRATE field is blinking, press the ENT key to
begin the procedure.
2. The PFD display instructs the operator to gradually increase power from idle to full throttle and
back to idle over a period of 2-4 minutes.
3. 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.
4. 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 associated numeric values
are displayed on the PFD.
NOTE
Should a failure occur, the technician may perform the Engine Run-up test up to 3 times successively
before corrective action must be taken. 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.
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