Propeller Owner’s Manual
175
INTRODUCTION
61-00-75
Page 1-11
Rev. 1 Jun/11
Overspeed Damage . . . Damage that occurs when the
propeller hub assembly rotates at
a speed greater than the maximum
limit for which it is designed
Pitch . . . . . . . . . . . . . . . Same as “Blade Angle”
Pitting . . . . . . . . . . . . . . Formation of a number of small,
irregularly shaped cavities in surface
material caused by corrosion or
wear
Reversing . . . . . . . . . . . The capability of rotating blades to
a position to generate reverse thrust
to slow the aircraft or back up
Scratch . . . . . . . . . . . . . Same as “Nick”
Single Acting . . . . . . . . . Hydraulically actuated propeller that
utilizes a single oil supply for pitch
control
Superseded . . . . . . . . . Parts that are considered airworthy
for continued flight but may no
longer be available
Synchronizing . . . . . . . . Adjusting the RPM of all the
propellers of a multi-engine aircraft
to the same RPM
Synchrophasing . . . . . . A form of propeller sychronization
in which not only the RPM of the
engines (propellers) are held
constant, but also the position of the
propellers in relation to each other
Track . . . . . . . . . . . . . . . In an assembled propeller, a
measurement of the location of
the blade tip with respect to the
plane of rotation, used to verify face
alignment and to compare blade tip
location with respect to the locations
of the other blades in the assembly
Term
Definition
OBSOLETE PROPELLER MODELS. SEE COVER PAGE
WARNINGS AND SERVICE BULLETIN HC-SB-61-331
