Page 4-8
Rev. 1 Jun/11
TESTING AND TROUBLESHOOTING
61-00-75
Propeller Owner's Manual
175
(b) HC-8( )( )( )-1( )( ), -2( )( ), and -3( )( ) propeller
models:
1
Governor is not reducing oil volume in the
propeller.
2
Excessive friction in the blade bearings or the
pitch change mechanism
3
Excessive friction in the misalignment between
the guide collar and the piston rods
(3) Decrease in engine speed while increasing airspeed:
(a) HC-82(X,V)(F,L )-6( )( )( ) propeller models:
1
Governor pilot valve is stuck and is excessively
increasing oil volume.
(b) HC-8( )( )( )-1( )( ), -2( )( ), and -3( )( ) propeller
models:
1
Governor pilot valve is stuck and is excessively
decreasing oil volume.
2
Feathering command is engaged on the
propeller pitch control -2( )( ), and -3( )( )
propeller models only.
(4) Increase in engine speed while decreasing airspeed:
(a) HC-82(X,V)(F,L )-6( )( )( ) propeller models:
1
Governor pilot valve is stuck and is excessively
decreasing oil volume in the propeller.
(b) HC-8( )( )( )-1( )( ), -2( )( ), and -3( )( ) propeller
models:
1
Governor pilot valve is stuck and is excessively
increasing oil volume.
(5) Decrease in engine speed while decreasing airspeed:
(a) HC-82(X,V)(F,L )-6( )( )( ) propeller models:
1
Governor is not reducing oil volume in the
propeller.
2
Excessive friction in the blade bearings or pitch
change mechanism
OBSOLETE PROPELLER MODELS. SEE COVER PAGE
WARNINGS AND SERVICE BULLETIN HC-SB-61-331
