Propeller Owner’s Manual
147
INTRODUCTION
61-00-47
Page 1-25
Rev. 16 May/20
Term
Definition
Overspeed
Condition in which the RPM of the propeller
or engine exceeds predetermined maximum
limits; the condition in which the engine
(propeller) RPM is higher than the RPM
selected by the pilot through the propeller
control/condition lever
Pitch
Same as “Blade Angle”
Pitting
Formation of a number of small, irregularly
shaped cavities in surface material caused
by corrosion or wear
Pitting (Linear)
The configuration of the majority of pits
forming a pattern in the shape of a line
Porosity
An aggregation of microvoids. See “voids”.
Propeller Critical
Parts
A part on the propeller whose primary failure
can result in a hazardous propeller effect, as
determined by the safety analysis required
by Title 14 CFR section 35.15
Reference Blade
Radius
Refers to the propeller reference blade
radius in an assembled propeller, e.g.,
30-inch radius. A measurement from the
propeller hub centerline to a point on a
blade, used for blade angle measurement
in an assembled propeller. An adhesive
stripe (blade angle reference tape CM160) is
usually located at the reference blade radius
location.
Note: Do not confuse
reference blade
radius
with
blade station
; they may
not originate at the same point.
Reversing
The capability of rotating blades to a position
to generate reverse thrust to slow the aircraft
or back up
