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Page 7-16 G1000 System Maintenance Manual
Rev. A 190-00903-00
Procedure D: Engine Run-Up Vibration Test
Figure 7-5. Engine Run-Up
This procedure must be performed for both GRS 77 units installed in the aircraft. Calibration
Procedures A1 and B are not required prior to this procedure.
1. Press the FMS inner knob to highlight GRS 77 #1. The FMS inner knob can now be turned
to select either GRS 77 #1 or GRS 77 #2 for calibration. Press the ENT key after selecting
the desired GRS 77 unit to calibrate. The SELECT PROCEDURE field is now blinking.
2. Select the ENGINE RUN-UP TEST procedure.
3. Press the ENT key.
4. 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.
5. 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.
6. 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.
7. 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. 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:
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