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LMM for the Kodiak 100
190-02102-00 Rev.4
and numeric values are displayed on the PFD. Use the FMS small knob to scroll
through and view the entire list of failed measurements.
7. If failures are indicated, the engine run-up test can 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.
8. When the engine run-up test fails repeatedly, record the values that are reported
to be out of range for future reference.
9. The following are potential causes for failure of the engine run-up test:
• Excessive flexibility of GRS 79 and/or GMU 44(B) mechanical mounting with
respect to the airframe.
• Vibrational motion of GRS 79 and/or GMU 44(B) caused by neighboring
equipment and/or supports.
• Mounting of GRS 79 at a location that is subject to severe vibrations (example;
close to an engine mount).
• Mounting screws and other hardware for GRS 79 and/or GMU 44(B) not firmly
attached.
• Absence of mounting supports recommended by the aircraft manufacturer
• GRS 79 connector not firmly attached to unit.
• Cabling leading to GRS 79 or GMU 44(B) not firmly secured to supporting
structure.
• An engine/propeller combination significantly out of balance.
• In some aircraft, attempting the engine run-up test on a day with very strong
and/or gusty winds might cause the test to occasionally fail. However, windy
conditions should not be taken as evidence the test would pass in calm
conditions; an actual pass is required before the installation can be considered
adequate.
• Press the ENTER key on the PFD to conclude this procedure.
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