Propeller Owner’s Manual
136
INSPECTION AND CHECK
61-00-36
Page 5-21
Rev. 2 Feb/17
5. Special Inspections
CAUTION:
INSTRUCTIONS AND PROCEDURES IN
THIS SECTION MAY INVOLVE PROPELLER
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. Overspeed
An overspeed occurrs when the propeller RPM exceeds
the maximum RPM stated in the applicable Aircraft Type
Certificate Data Sheet. An
overspeed condition occurs when
the engine speed exceeds the limits established by the engine,
propeller, or airframe manufacturer. The duration of time at
overspeed for a single event determines the corrective action
that must be taken to make sure no damage to the propeller
has occurred.
The criteria for determining the required action after an
overspeed are based on many factors. The additional
centrifugal forces that occur during overspeed are not the
only concern. Some applications have sharp increases in
vibratory stresses at RPMs above the maximum rated for the
airframe/engine/propeller combination.
(1) When a propeller installed on a reciprocating engine has
an overspeed event, refer to the Reciprocating Engine
Overspeed Limits (Figure 5-3) to determine the corrective
action to be taken.
(2) Make an entry in the propeller logbook about the
overspeed event.
