MOONEY AVIATION COMPANY, INC.
M20TN SERVICE & MAINTENANCE MANUAL
Date
2006
Rev Date
Page 10
Loss of Propeller Control:
Propeller goes to Uncommanded
Low Pitch (High RPM).
1 -- Governor pressure relief valve
for proper operation.
2 -- Governor drive for damage.
3 -- Adequate engine oil supply.
4 -- Engine transfer bearing leaking
excessively.
Propeller goes to Uncommanded
High Pitch (Low RPM).
Governor pilot valve sticking.
RPM Increases with Power and Air-
speed, Propeller RPM Control has
Little or No Effect.
1 -- Excessive friction in blade bear-
ings or pitch changing mechanism.
2 -- Internal oil leakage to opposite
side of piston and into hub.
Vibration:
-- CAUTION --
Any vibration that can be de-
scribed as appearing suddenly, or
is accompanied by unexplained
grease leakage, should be investi-
gated immediately before further
flight.
NOTE:
Vibration problems due to propel-
ler system imbalance are normally
felt throughout the RPM range,
with the intensity of vibration in-
creasing with RPM. Vibration
problems that occur in a narrow
RPM range are a symptom of res-
onance, which is potentially
harmful to the propeller. Avoid op-
eration until the propeller can be
checked by an appropriately li-
censed repair facility
Check:
1 -- Control surfaces, cowl flaps, ex-
haust system, landing gear doors,
etc. for excessive play, which may
be causing vibration unrelated to the
propeller.
2 -- Secure attachment of engine
mounted hardware.
3 -- Engine mount wear.
4 -- Uneven or over lubrication of
propeller.
5 -- Proper engine/propeller flange
mating.
6 -- Blade track (For procedure, see
Hartzell Owner’s Manual).
7 -- Blade angles: Blade angle must
be within 0.2 degree from blade to
blade.
8 -- Spinner for cracks, improper
installation, or ”wobble” during op-
eration.
9 -- Static balance.
10 -- Airfoil profile identical between
blades (after overhaul or rework for
nicks -- verify at appropriately li-
censed propeller repair facility).
11 -- Propeller installation -- remove
and reinstall propeller 180 degrees
from original installation position.
12 -- Hub or blade damage or crack-
ing.
13 -- Grease or oil leakage from a
seemingly solid surface of the hub or
blade.
14 -- Bends or blade deformation.
61--20--90
Summary of Contents for M20TN
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Page 151: ...MOONEY AVIATION COMPANY INC M20TN SERVICE MAINTENANCE MANUAL CHAPTER 21 ENVIRONMENTAL SYSTEMS ...
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