Propeller Owner's Manual
115N
TESTING AND TROUBLESHOOTING
61-00-15
Page 4-5
Rev. 24 Dec/20
(2) If the propeller is surging:
(a) Perform the “Initial Run-Up” in accordance with the
Inspection and Check chapter of this manual to
release trapped air from the propeller.
1 If surging reoccurs it is most likely due to a faulty
governor.
a Have the governor tested by
a certified
propeller repair station with the appropriate
rating.
(b) Hunting and/or surging may also be caused by
friction or binding within the governor control, or
internal propeller corrosion, which causes the
propeller to react slower to governor commands.
1 To isolate these faults, the propeller must be
tested on a test bench
at a certified propeller
repair station with the appropriate rating.
B. Engine Speed Varies with Flight Attitude (Airspeed)
(1) Small variances in engine speed are normal and are no
cause for concern.
(2) Increase in engine speed while descending or increasing
airspeed:
(a) Non-feathering (-1) propeller:
1 Governor is not increasing oil volume in the
propeller.
2 Engine transfer bearing is leaking excessively.
3 Excessive friction in blade bearings or pitch
changing mechanism.
(b) Feathering (-2, -5) or Aerobatic (-4) propeller:
1 Governor is not reducing oil volume in propeller.
2 Air charge (-2, -5) too low. Refer to Air Charge in
the Maintenance Practices chapter of this manual.
3 Excessive friction in blade bearings or pitch
changing mechanism.
Содержание HC-C2YR-4CF/FC8475-6
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