Page 5-6
G1000/GFC 700 Post Installation Checkout Procedure - Hawker / Beechcraft King Air C90
Revision 5
190-00682-00
5.3.3
Procedure C: Engine Run-Up
Calibration Procedure C must be performed in order to guarantee that the AHRS mounting is sufficiently
rigid and insensitive to vibration.
1. Ensure the GRS1 is selected.
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 PFD1, 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 PFD1 display instructs the operator to gradually increase power from idle to full throttle and
back to idle over a period of 1-2 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.
5. Perform steps 1 - 4 for the left and right engine.
6. PFD1 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.
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 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. Press
the
ENT
key on PFD1 to conclude this procedure.
8. Repeat Steps 2 – 7 for GRS2.
9. Proceed to Section 5.3.4.
NOTE
