Propeller Owner’s Manual
139
TESTING AND TROUBLESHOOTING
61-00-39
Page 4-9
Rev. 17 Apr/20
(h) Spinner for cracks, improper installation, or
"wobble"
during operation
(i) Static balance
(j) Hub damage or cracking
(k) Grease or oil leakage
(l) Blade deformation
(2) Dynamic Balance
(a) Dynamic balancing is recommended after installing
or performing maintenance on a propeller. While
this is
normally an optional task, it may be required
by the engine or airframe manufacturer to make
certain the propeller/engine combination is balanced
properly before operation.
1
Refer to the engine or airframe manuals, and the
Maintenance Practices chapter of this manual.
H. Propeller Overspeed/Avoidance
(1) Check:
(a) Low pitch stop adjustment.
(b) Governor maximum RPM set too high.
(c) Broken feathering spring.
(d) Governor pilot valve jammed, supplying high
pressure only.
(e) Tachometer error.
I. Propeller Underspeed
(1) Check:
(a) Governor oil pressure low.
(b) Governor oil passage clogged.
(c) Tachometer error.