Propeller Owner’s Manual
147
INTRODUCTION
61-00-47
Page 1-18
Rev. 16 May/20
14.
Definitions
(Rev. 4)
A basic understanding of the following terms will assist in
maintaining and operating Hartzell Propeller Inc. propeller
systems.
Term
Definition
Annealed
Softening of material due to overexposure to
heat
Aviation Certified
Intended for FAA or international equivalent
type certificated aircraft applications. A TC
and PC number must be stamped on the
hub, and a PC number must be stamped on
blades.
Aviation
Experimental
Intended for aircraft/propeller applications
not certified by the FAA or international
equivalent. Products marked with an “X”
at or near the end of the model number or
part number are not certified by the FAA or
international equivalent and are not intended
to use on certificated aircraft.
Beta Operation
A mode of pitch control that is directed
by the pilot rather than by the propeller
governor
Beta Range
Blade angles between low pitch and
maximum reverse blade angle
Beta System
Parts and/or equipment related to operation
(manual control) of propeller blade angle
between low pitch blade angle and full
reverse blade angle
Blade Angle
Measurement of blade airfoil location
described as the angle between the blade
airfoil and the surface described by propeller
rotation
