MAINTENANCE PRACTICES
61-00-36
Page 6-15
Rev. 2 Feb/17
Propeller Owner's Manual
136
A. Repair of Nicks or Gouges
Local repairs may be made using files, electrical or air
powered equipment. Emery cloth, Scotch Brite
®
, and crocus
cloth are to be used for final finishing. Refer to Figure 6-4.
CAUTION 1: REWORK THAT INVOLVES COLD
WORKING THE METAL, RESULTING
IN CONCEALMENT OF A DAMAGED
AREA, IS NOT PERMITTED. A STRESS
CONCENTRATION MAY EXIST THAT CAN
RESULT IN A BLADE FAILURE.
CAUTION 2: SHOT PEENED BLADES ARE IDENTIFIED
WITH AN "S" FOLLOWING THE BLADE
MODEL NUMBER, AS DESCRIBED IN
THE DESCRIPTION AND OPERATION
CHAPTER OF THIS MANUAL. BLADES
THAT HAVE DAMAGE IN SHOT PEENED
AREAS IN EXCESS OF 0.015 INCH
(0.38 MM) DEEP ON THE FACE OR
CAMBER OR 0.250 INCH (6.35 mm) ON
THE LEADING OR TRAILING EDGES
MUST BE REMOVED FROM SERVICE,
AND THE REWORKED AREA SHOT
PEENED BEFORE FURTHER FLIGHT.
SHOT PEENING OF AN ALUMINUM
BLADE MUST BE ACCOMPLISHED BY
AN FAA APPROVED REPAIR FACILITY
IN ACCORDANCE WITH HARTZELL
PROPELLER INC. ALUMINUM BLADE
OVERHAUL MANUAL 133C (61-13-33).
(1) Repairs to the leading or trailing edge are to be
accomplished by removing material from the bottom of
the damaged area. Remove material from this point out
to both sides of the damage, providing a smooth, blended
depression which maintains the original airfoil general
shape.
(2) Repairs to the blade face or camber should be made in
the same manner as above. Repairs that form a
continuous line across the blade section (chordwise) are
unacceptable.
