System Maintenance Manual

G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air Page 7-33
190-00682-01 Revision F
7.7.5 Procedure D: Engine Run-Up Vibration Procedure
NOTE
Calibration Procedure D is performed in order to guarantee that the AHRS mounting is
sufficiently rigid and insensitive to vibration. This procedure must be performed for both GRS
77 units installed in the aircraft. Calibration Procedures A1 and B (Sections 7.7.2 and 7.7.4
respectively) are not required prior to this procedure.
Figure 7-7, Engine Run-Up Test Page
1. Press the FMS small knob to highlight GRS 77 #1. The FMS small 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 not blinking.
2. 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.
3. 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.
4. 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.