Propeller Owner’s Manual
147
INSPECTION AND CHECK
61-00-47
Page 5-22
Rev. 17 Sep/20
(c) Perform a visual inspection for cracks in the hub.
1 Extra attention should be given to the blade
retention area of the hub.
2 A crack may be visible or may be indicated by
grease leaking from a seemingly solid surface.
(d) If cracks are suspected, additional inspections to
verify the condition must be performed before further
flight.
1 Inspections typically include disassembly of the
propeller followed by inspection of parts, using
nondestructive methods in accordance with
published procedures.
2 These inspections must be performed by
a certified propeller repair station with the
appropriate rating.
(e) If cracks or failing components are found, these
parts must be replaced before further flight.
1 Report such occurrences to the appropriate
airworthiness authorities and to Hartzell
Propeller Inc. Product Support.
C. Vibration
(Rev. 1)
NOTE: 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 blades and the blade retention
components should be considered as potential
sources of the vibration.
(1) Important Information
(a) Instances of abnormal vibration should be
investigated immediately. If the cause of the vibration
is not readily apparent, examine the propeller in
accordance with the instructions in this section.
(b) Perform troubleshooting and evaluation of possible
sources of vibration in accordance with engine or
airframe manufacturer’s instructions.