Propeller Owner’s Manual
136
INSPECTION AND CHECK
61-00-36
Page 5-14
Rev. 2 Feb/17
C. Vibration
Instances of abnormal vibration should be investigated
immediately. If the cause of the vibration is not readily
apparent, the propeller may be inspected following the
procedure below:
NOTE
: It may be difficult to readily identify the cause of
abnormal vibration. It may originate in the engine,
propeller, or airframe. Troubleshooting procedures
typically initiate with investigation of the engine.
Airframe components (such as engine mounts or
loose landing gear doors) can also be the source
of vibration. When investigating an abnormal
vibration, the possibility of a failing blade or blade
retention component should be considered as a
potential source of the problem.
(1) Perform troubleshooting and evaluation of possible
sources of vibration in accordance with engine or
airframe manufacturer's instructions.
(2) Refer to the Vibration section in the Testing and
Troubleshooting chapter of this manual. Perform the
checks to determine possible cause of the vibration.
(a) If no cause is found, then consider that the origin of
the problem could be the propeller and proceed with
steps 4.C.(3) through 4.C.(8) in this chapter.
(3) Remove the spinner dome.
(4) Perform a visual inspection for cracks in the hub.
(a) Pay particular attention to the blade retention areas
of the hub.
(b) A crack may be readily visible or may be indicated by
grease leaking from a seemingly solid surface.
(5) If cracks are suspected, additional inspections must
be performed before further flight. These inspections
must be performed by qualified personnel at a certified
propeller repair station with the appropriate rating to
verify the condition. Such inspections typically include
disassembly of the propeller, followed by inspection of
parts, using nondestructive methods in accordance with
published procedures.
