Hartzell HC-D2MV20-3 Series, Owner'S Manual And Logbook

Page: 169 / 204

inspection and check
61-00-40
propeller owner’s Manual
140
Page 5-13
Rev. 2 Jun/12
(5) Check the blades and compare blade-to-blade differences:
(a) Inspect the propeller blades for unusual looseness
or movement. Refer to Loose Blades section of this
chapter.
(b) Check blade track. Refer to Blade Track section of this
chapter.
CAUTION: DO NOT USE BLADE PADDLES TO
TURN THE BLADES.
(c) Manually (by hand) attempt to turn the blades (change
pitch).
(d) Visually check for damaged blades.
(6) If abnormal blade conditions or damage are found,
perform additional inspections (by qualified personnel
at an appropriately licensed propeller repair station) to
evaluate the condition. Refer to Blade Repairs section in
Maintenance Practices chapter of this manual.
(7) If cracks or failing components are found, these parts must
be replaced before further flight. Report such occurrences
to airworthiness authorities and Hartzell Propeller Inc.
Product Support.
D. Tachometer Inspection
WARNING: OPERATION WITH AN INACCURATE
TACHOMETER MAY RESULT IN
RESTRICTED RPM OPERATION AND
DAMAGING HIGH STRESSES. BLADE
LIFE WILL BE SHORTENED AND COULD
RESULT IN CATASTROPHIC FAILURE.
NOTE: An appropriately licensed propeller repair station
may also be able to perform a tachometer
inspection.
(1) For installations that use a mechanical tachometer,
perform the following tachometer inspection.
(a) Use a hand held tachometer to verify the accuracy
of the engine tachometer at 100 hour intervals or at
annual inspection, whichever occurs first.
(b) Hartzell Propeller Inc. recommends using a
tachometer that is accurate /- 10 RPM, has
NIST calibration (traceable), and has an appropriate
calibration schedule.