Garmin G3X Installation Manual page 162

If failures are indicated, the engine run-up test may be repeated up to three times. If the
test does not pass after three attempts, the installation should be considered unreliable
until the source of the vibration problem is identified and remedied. If the engine run-up
test fails repeatedly, 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) Excessive flexing of GSU 73 and/or GMU 44 mechanical mounting with respect to
airframe (See Sections 4 and 5 for applicable mounting requirements and
instructions).
b) Vibration or motion of GSU 73 and/or GMU 44 caused by neighboring equipment
and/or supports.
Page 9-22
Revision E
NOTE
G3X Installation Manual – Post Installation Checkout and Calibration Procedures
190-01115-01