Propeller Owner's Manual
136
TESTING AND TROUBLESHOOTING
61-00-36
Page 4-7
Rev. 2 Feb/17
3. Troubleshooting
CAUTION:
INSTRUCTIONS AND PROCEDURES IN
THIS SECTION MAY INVOLVE PROPELLER
CRITICAL PARTS. REFER TO THE
INTRODUCTION CHAPTER OF THIS
MANUAL FOR INFORMATION ABOUT
PROPELLER CRITICAL PARTS. REFER TO
THE ILLUSTRATED PARTS LIST CHAPTER
OF THE APPLICABLE OVERHAUL MANUAL(S)
FOR THE IDENTIFICATION OF SPECIFIC
PROPELLER CRITICAL PARTS.
A. Hunting and Surging
Hunting is characterized by a cyclic variation in engine
speed above and below desired speed. Surging is
characterized by a large increase/decrease in engine
speed, followed by a return to set speed after one or two
occurrences.
(1) If the propeller is hunting, a repair station should check:
(a) Governor
(b) Fuel control
(c) Synchrophaser or synchronizer
(2) If propeller is surging:
(a) Perform Steps 1.B.(1)-1.B.(4) under "Operational
Tests," in this chapter.
(b) If surging reoccurs, it is most likely due to a faulty
governor.
(c) Have the governor tested
at a certified propeller
repair station with the appropriate rating.
(3) Hunting and/or surging may also be caused by friction
or binding within the governor control, or by internal
propeller corrosion, which causes the propeller to react
slower to governor commands.
(a) The propeller must be inspected/tested at
a certified
propeller repair station with the appropriate rating to
isolate these faults.
