Propeller Owner's Manual
175
MAINTENANCE PRACTICES
61-00-75
Page 6-16
Rev. 1
Jun/11
5. Dynamic Balance
A. Overview
WARNING:
WHEN USING REFLECTIVE TAPE FOR
DYNAMIC BALANCING, DO NOT APPLY
THE TAPE ON EXPOSED BARE METAL OF
A BLADE. THIS WILL PERMIT MOISTURE TO
COLLECT UNDER THE TAPE AND CAUSE
CORROSION THAT CAN PERMANENTLY
DAMAGE THE BLADE.
NOTE:
Dynamic balance is recommended to reduce
vibrations which may be caused by a rotating
system (propeller and engine) imbalance. Dynamic
balancing can help prolong the life of the propeller,
engine, airframe, and avionics.
(1) Dynamic balance is accomplished by using an accurate
means of measuring the amount and location of the
dynamic imbalance.
(2) The number of balance weights installed must not
exceed the limits specified in this chapter.
(3) Follow the dynamic balance equipment manufacturer’s
instructions for dynamic balance in addition to the
specifications of this section.
NOTE:
Some engine manufacturers' instructions also
contain information on dynamic balance limits.
(4) Unless otherwise specified by the engine or airframe
manufacturer, Hartzell recommends that the propeller be
dynamically balanced to a reading of 0.2 IPS or less.
B. Inspection Procedures Before Balancing
(1) Visually inspect the propeller assembly before dynamic
balancing.
NOTE
: The first run-up of a new or overhauled
propeller assembly may leave a small amount
of grease on the blades and inner surface of
the spinner dome.
(a) Use Stoddard solvent (or equivalent) to completely
remove any grease on the blades or inner surface of
the spinner dome.
OBSOLETE PROPELLER MODELS. SEE COVER PAGE
WARNINGS AND SERVICE BULLETIN HC-SB-61-331
