Propeller Owner’s Manual
139
MAINTENANCE PRACTICES
61-00-39
Page 6-16
Rev. 17 Apr/20
(3) Normal erosion (sand-blasted appearance) on the
leading edge of the blade is acceptable and does not
require removal before further flight.
B. Repair of Nicks and Gouges
(1) Local repairs may be made using files, electrical or air
powered equipment. Use emery cloth, Scotch Brite
®
, and
crocus cloth f
or final finishing.
CAUTION 1: ANY REPAIR 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" IMMEDIATELY FOLLOWING
THE BLADE MODEL NUMBER, AS
DESCRIBED IN THE DESCRIPTION AND
OPERATION CHAPTER OF THIS MANUAL.
BLADES THAT HAVE DAMAGE IN THE
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 A CERTIFIED
PROPELLER REPAIR STATION WITH THE
APPROPRIATE RATING IN ACCORDANCE
WITH HARTZELL PROPELLER INC.
ALUMINUM BLADE MANUAL 133C
(61-13-33).
