Garmin G1000 Nxi System Maintenance Manual page 328

6. 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 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 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 GSU/GRS and/or GMU44 caused by neighboring
equipment and/or supports.
b) Mounting screws and other hardware for GSU/GRS and/or GMU44 not
firmly attached.
c) GSU/GRS connector not firmly attached to unit.
d) Cabling leading to GSU/GRS or GMU44 not firmly secured to supporting
structure.
e) An engine / propeller that is significantly out of balance.
7. Press the ENT key on the PFD to conclude this procedure
8. Repeats steps 2 through 7 for GSU/GRS 2 then the aircraft can be taxied back and the
engine can be shut down for final testing. Continue to Section 7.10.5.
GSU/GRS/GMU Test
Start the displays in normal mode. The ADAHRS/AHRS attitude and heading information
displayed should become valid within 1 minute of power-up as shown in Figure 7-8 if at least
one GPS receiver has a valid position. If GPS is unavailable, the ADAHRS/AHRS initialization
may take up to 2 minutes.
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
NOTE
Page 315
Revision 1