Propeller Owner's Manual
115N
TESTING AND TROUBLESHOOTING
61-00-15
Page 4-7
Rev. 24 Dec/20
C. Loss of Propeller Control (-1 propellers only)
(1) Propeller goes to uncommanded Low Pitch (High RPM)
(a) Loss of propeller oil pressure - Check:
1 Governor pressure relief valve for proper
operation
2 Governor drive for damage
3 Adequate engine oil supply
4 Engine transfer bearing leaking excessively
(2) Propeller goes to uncommanded High Pitch (Low RPM)
(a) Governor pilot valve sticking
(3) RPM Increases with Power and Airspeed, Propeller RPM
Control has Little or No Effect
(a) Excessive friction in blade bearings or pitch
changing mechanism
(b) Internal oil leakage to opposite side of piston and
into hub
Содержание HC-C2YR-4CF/FC8475-6
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