Garmin GDU 370 Installation Manual page 106

7. Ensure that the aircraft has been properly positioned per the on-screen instructions.
8. Use the FMS Joystick to highlight the Calibrate button at the bottom of the display, press the
ENT Key to begin the calibration.
9. The PFD display instructs the operator to gradually increase power from idle to full throttle
and back to idle over the course of a couple of minutes.
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 flexibility of GSU 73 and/or GMU 44 mechanical mounting with respect
to airframe (See Section 2.6 entitled "Aircraft Mounting Requirements for
GSU 73/GMU 44").
b) Vibrational motion of GSU 73 and/or GMU 44 caused by neighboring equipment
and/or supports.
c) Mounting of GSU 73 at a location that is subject to severe vibrations (example; close
to an engine mount.)
d) Mounting screws and other hardware for GSU 73 and/or GMU 44 not firmly
attached.
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Revision A
NOTE
G3X Installation Manual – Post Installation Checkout and Calibration Procedures
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