190-01115-01
G3X/G3X Touch Install Manual - GDU 4XX Config and Post Install Checkout
Rev. AC
Page 34-17
7. Press the Done softkey when engine runup has been completed, the test results will be displayed.
Ensure that test results indicate Passed, then press the Done button to return to the ADAHRS page.
The following are potential causes for failure of the engine run-up test:
a) Excessive flexing of GSU 25/GSU 73 and/or GMU magnetometer mechanical mounting
with respect to airframe (see
, and
for applicable mounting
requirements and instructions).
b) Vibration or motion of GSU 25/GSU 73 and/or GMU magnetometer caused by neighboring
equipment and/or supports.
c) Mounting of GSU 25/GSU 73 at a location that is subject to severe vibrations (for example
close to an engine mount).
d) Mounting screws and other hardware for GSU 25/GSU 73 and/or GMU magnetometer not
firmly attached.
e) Absence of recommended mounting supports.
f) GSU 25/GSU 73 connector not firmly attached to unit.
g) Cabling leading to GSU 25/GSU 73 or GMU magnetometer not firmly secured to support-
ing structure.
h) An engine/propeller combination that is significantly out of balance.
NOTE
In some aircraft, attempting the engine run-up test on a day with very strong and/or gusty
winds may cause the test to occasionally fail. However, windy conditions should not be
taken as evidence that the test would pass in calm conditions; an actual pass is required
before the installation can be considered adequate.
