Garmin G1000 Maintenance Manual page 150

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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:
•
Vibration motion of GRS 77 and/or GMU 44 caused by neighboring equipment and/or
supports.
•
Mounting screws and other hardware for GRS 77 and/or GMU 44 not firmly attached.
•
GRS 77 connector not firmly attached to unit.
•
Cabling leading to GRS 77 or GMU 44 not firmly secured to supporting structure.
•
An engine / propeller that is significantly out of balance
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Rev. B
NOTE
G1000 System Maintenance Manual
190-00907-00