Propeller Owner’s Manual
139
MAINTENANCE PRACTICES
61-00-39
Page 6-24
Rev. 17 Apr/20
6. Dynamic Balance
CAUTION:
INSTRUCTIONS AND PROCEDURES IN THIS
SECTION MAY INVOLVE CRITICAL PARTS.
REFER TO THE INTRODUCTION CHAPTER
OF THIS MANUAL FOR INFORMATION ABOUT
PROPELLER CRITICAL PARTS. REFER TO
THE ILLUSTRATED PARTS LIST CHAPTER
OF THE APPLICABLE OVERHAUL MANUAL(S)
FOR THE IDENTIFICATION OF SPECIFIC
PROPELLER CRITICAL PARTS.
A. Overview
WARNING:
WHEN USING REFLECTIVE TAPE FOR
DYNAMIC BALANCING, DO NOT APPLY
THE TAPE ON EXPOSED BARE METAL OF
A BLADE. THIS WILL ALLOW MOISTURE TO
COLLECT UNDER THE TAPE AND CAUSE
CORROSION THAT CAN PERMANENTLY
DAMAGE THE BLADE. REFLECTIVE TAPE
MUST BE REMOVED AFTER DYNAMIC
BALANCING IS COMPLETED.
NOTE: Dynamic balance is recommended to reduce
vibrations that 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 maximum permitted imbalance reading is 0.2 IPS.
(3) The number of balance weights installed must not
exceed the limits specified in this chapter.
(4) Follow the dynamic balance equipment manufacturer’s
instructions for dynamic balance in addition to the
specifications of this section.
NOTE: Some engine manufacturer's instructions also
contain information on dynamic balance limits.
