Propeller Owner’s Manual
139
TESTING AND TROUBLESHOOTING
61-00-39
Page 4-1
Rev. 17 Apr/20
TESTING AND TROUBLESHOOTING - CONTENTS
1. Operational Checks ....................................................................4-3
A. Operational Checks ...............................................................4-3
2. Propeller Ice Protection Systems ...............................................4-3
A. Operational Checks and Troubleshooting ..............................4-3
3. Troubleshooting .........................................................................4-4
A. Hunting and Surging ..............................................................4-4
B. Engine Speed Varies with Airspeed .......................................4-5
C. Loss of Propeller Control .......................................................4-6
D. Failure to Feather (or feathers slowly) ...................................4-6
E. Failure to Unfeather ...............................................................4-6
F. Start Lock Units Fail to Latch .................................................4-7
G. Vibration .................................................................................4-8
H. Propeller Overspeed ..............................................................4-9
I. Propeller Underspeed ............................................................4-9
