inspection and check
61-00-40
propeller owner’s Manual
140
Page 5-12
Rev. 2 Jun/12
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 sometimes be difficult to readily identify
the cause of abnormal vibration. Vibration may
originate in the engine, propeller, or airframe.
Troubleshooting procedures typically begin with an
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. 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.(7).
(3) Perform a visual inspection for cracks in the hub, blade
clamps and blades.
NOTE: A crack may be readily visible or may be
indicated by grease leaking from a seemingly
solid surface.
(4) If cracks are suspected, additional inspections must be
performed before further flight. These inspections must
be performed by qualified personnel at an appropriately
licensed propeller repair station 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.
Summary of Contents for HC-D2MV20-3 Series
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