Propeller Owner's Manual
136
TESTING AND TROUBLESHOOTING
61-00-36
Page 4-13
Rev. 2 Feb/17
H. Vibration
CAUTION 1: ANY VIBRATION THAT OCCURS
SUDDENLY, OR THAT IS ACCOMPANIED
BY UNEXPLAINED GREASE LEAKAGE
SHOULD BE INVESTIGATED
IMMEDIATELY BEFORE FURTHER
FLIGHT.
CAUTION 2: VIBRATION PROBLEMS BECAUSE OF
PROPELLER SYSTEM IMBALANCE ARE
NORMALLY FELT THROUGHOUT THE
RPM RANGE, WITH THE INTENSITY OF
VIBRATION INCREASING WITH RPM.
VIBRATION PROBLEMS THAT OCCUR
IN A NARROW RPM RANGE ARE A
SYMPTOM OF RESONANCE, THAT
IS POTENTIALLY HARMFUL TO THE
PROPELLER. AVOID OPERATION UNTIL
THE PROPELLER CAN BE CHECKED AT A
CERTIFIED PROPELLER REPAIR STATION
WITH THE APPROPRIATE RATING.
(1) Check:
(a) Control surfaces, cowl flaps, exhaust system,
landing gear doors, etc. for excessive play, which
may be causing vibration unrelated to the propeller.
(b) Secure attachment of engine mounted hardware.
(c) Engine mount wear.
(d) Uneven or over lubrication of propeller.
(e) Correct engine/propeller flange mating.
(f) Blade track. Refer to Blade Track in the Inspection
and Check chapter of this manual.
(g) Blade angles: Blade angle must be within 0.2 degree
from blade to blade.
(h) Spinner for cracks, incorrect installation, or "wobble"
during operation.
(i) Static balance.