Propeller Owner’s Manual
147
INTRODUCTION
61-00-47
Page 1-22
Rev. 16 May/20
Term Denition
Depression Surface area where the material has been
compressed but not removed
Distortion Alteration of the original shape or size of a
component
Edge Alignment Distance from the blade centerline to the
leading edge of the blade
Erosion Gradual wearing away or deterioration due
to action of the elements
Exposure Leaving material open to action of the
elements
Face The surface of the blade that is directed
toward the rear of the aircraft. The face side
is the high pressure, or thrusting, side of the
blade. The blade airfoil sections are normally
cambered or curved such that the face side
oftheblademaybeatorevenconcavein
the midblade and tip region.
Face Alignment Distance from the blade centerline to the
highest point on the face side perpendicular
to the chord line
Feathering The capability of blades to be rotated
parallel to the relative wind, thus reducing
aerodynamic drag
Fraying A raveling or shredding of material
Fretting Damage that develops when relative motion
of small displacement takes place between
contacting parts, wearing away the surface
Galling To fret or wear away by friction
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