Technical data

13773-001
61-00
Page 2 30 Nov 2000
2. TROUBLESHOOTING
Trouble Probable Cause Remedy
Surging propeller. Governor out of adjustment. Inspect and adjust governor.
Air in propeller governor oil body. Cycle propeller through pitch
range several times.
Engine speed varies with attitude
or airspeed.
Governor not properly controlling
propeller blade angle.
Inspect and adjust governor.
Friction in propeller. Inspect propeller and make neces-
sary adjustments.
Decrease in engine speed while
increasing airspeed.
Governor is excessively increas-
ing oil volume.
Inspect and adjust governor.
Decrease in engine speed while
decreasing airspeed.
Governor is not reducing oil vol-
ume.
Inspect and adjust governor.
Increase in engine speed while
decreasing airspeed.
Governor is excessively decreas-
ing oil volume.
Inspect and adjust governor.
Increase in engine speed while
increasing airspeed.
Governor is not increasing oil vol-
ume.
Inspect and adjust governor.
Propeller piston seal leaking oil to
opposite side of piston.
Remove propeller from aircraft,
disassembly, clean, and replace
propeller seals. (Refer to 61-10)
Propeller goes to uncommanded
low pitch.
Loss of propeller oil pressure Inspect governor pressure relief
valve, governor drive, engine oil
supply, engine transfer bearing for
leakage.
Oil leakage at engine flange/hub
interface.
Damaged O-ring seal between
engine and propeller.
Replace O-ring. (Refer to 61-10)
Mounting nuts not tight. Clean mating surface and tighten
nuts properly. (Refer to 61-10)
Oil leakage at any location Defective seals or incorrect
assembly.
Repair or replace seals as
required.