Propeller Owner's Manual
175
MAINTENANCE PRACTICES
61-00-75
Page 6-12
Rev. 1
Jun/11
(3) The area of repair should be determined as follows:
Leading and trailing edge damage: Depth of nick x 10.
Face and camber: Depth of nick x 20. Refer to
Figure 6-3.
NOTE
: Leading edge includes the first 10 percent
of chord from the leading edge. The trailing
edge consists of the last 20 percent of chord
adjacent to the trailing edge.
(4) After filing or sanding of the damaged area, the area
must then be polished, with emery cloth and finally with
crocus cloth to remove any traces of filing.
(5) Inspect the repaired area with a 10X magnifying glass
and dye penetrant. Ensure that no indication of the
damage, file marks, or coarse surface finish remain.
(6) Treat the repaired area to prevent corrosion. Properly
apply chemical conversion coating and approved paint to
the repaired area before returning the blade to service.
Refer to Painting After Repair in this section.
B. Repair of Bent Blades
CAUTION:
DO NOT ATTEMPT TO
"PRE-STRAIGHTEN" A BLADE BEFORE
DELIVERY TO AN AIRWORTHINESS
AGENCY APPROVED PROPELLER
REPAIR STATION. THIS WILL CAUSE
THE BLADE TO BE SCRAPPED BY THE
REPAIR STATION.
Repair of a bent blade or blades is considered a major
repair. This type of repair must be accomplished by an
Airworthiness agency approved propeller repair station, and
only within approved guidelines.
OBSOLETE PROPELLER MODELS. SEE COVER PAGE
WARNINGS AND SERVICE BULLETIN HC-SB-61-331