Page 5-9
Dec/05
Propeller Owner’s Manual
175
INSPECTION AND CHECK
61-00-75
(4) If cracks or failing components are found, these parts
must be replaced before further flight. Report such
occurrences to airworthiness authorities and to Hartzell
Propeller Inc. Product Support.
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 the 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.(8) in this chapter.
(3) Remove the spinner dome.
(4) 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.
OBSOLETE PROPELLER MODELS. SEE COVER PAGE
WARNINGS AND SERVICE BULLETIN HC-SB-61-331
