Propeller Owner’s Manual
139
TESTING AND TROUBLESHOOTING
61-00-39
Page 4-8
Rev. 17 Apr/20
G. Vibration
(Rev. 1)
CAUTION 1: ANY VIBRATION THAT CAN BE
DESCRIBED AS APPEARING SUDDENLY,
OR 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 BY 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
that may be
causing vibration that is unrelated to the propeller.
(b) Isolation of engine controls and lines
(c) Engine mount wear
(d) Uneven or over lubrication of propeller
(e) Proper engine/propeller flange mating
(f) Blade track:
1 Refer to the
section, "Blade Track" in the
Inspection and Check chapter of this manual.
(g) Blade angles:
1 Blade angle must be within
specified tolerance
between blades.
a
Refer to a certified propeller repair station with
the appropriate rating to check/adjust blade
angles.
