G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air
Page 7-25
190-00716-01
Revision 1
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.
6.
Press the ENT key on the PFD to conclude this procedure
7.
Repeats steps 1 through 6 for GRS 77 #2 and proceed to Section 7.7.6.
7.7.6
GRS/GMU Test
The aircraft can now be taxied back and the engine can be shut down for final testing. Restart the
displays in normal mode to conduct final system checks. When the PFDs power up in normal mode, the
AHRS attitude and heading information displayed should become valid within 1 minute of power-up, as
shown in Figure 7-7 (provided both GPS receivers have a valid position; if GPS is unavailable, AHRS
initialization may take as long as 2 minutes).
Figure 7-7, Normal Mode AHRS Check
If no other service is to be performed, continue to the return-to-service checks in Section 8.
Summary of Contents for Cessna Caravan G1000
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