Page 5-17
Dec/05
Propeller Owner’s Manual
175
INSPECTION AND CHECK
61-00-75
(d) Regardless of the degree of damage, make a log
book entry to document the lightning strike.
(e) The propeller must be removed from the aircraft,
disassembled, evaluated, and/or repaired by an
appropriately licensed propeller repair facility for
flight beyond the temporary operation limits granted
above.
C. Foreign Object Strike
(1) General
(a) A foreign object strike can include a broad spectrum
of damage, from a minor stone nick to severe
ground impact damage. A conservative approach in
evaluating the damage is required because there
may be hidden damage that is not readily apparent
during an on-wing, visual inspection.
(b) A foreign object strike is defined as:
1
Any incident, whether or not the engine is
operating, that requires repair to the propeller
other than minor dressing of the blades.
Examples of foreign object strike include
situations where an aircraft is stationary and
the landing gear collapses causing one or more
blades to be significantly damaged, or where
a hangar door (or other object) strikes the
propeller blade. These cases should be handled
as foreign object strikes because of potentially
severe side loading on the propeller hub, blades
and retention bearings.
2
Any incident during engine operation in which
the propeller impacts a solid object that causes
a drop in revolutions per minute (RPM) and
also requires structural repair of the propeller
(incidents requiring only paint touch-up are
not included). This is not restricted to propeller
strikes against the ground.
3
A sudden RPM drop while impacting water,
tall grass, or similar yielding medium, where
propeller blade damage is not normally incurred.
OBSOLETE PROPELLER MODELS. SEE COVER PAGE
WARNINGS AND SERVICE BULLETIN HC-SB-61-331
