Hartzell HC-D2MV20-3 Series Owner's Manual And Logbook page 190

CAUTION 2:
(2) Make repairs to the leading or trailing edge 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 that maintains
the original airfoil general shape.
(3) Make repairs to the blade face or camber in the same
manner as above. Repairs that form a continuous line
across the blade section (chordwise) are unacceptable.
(4) Determine the area of repair as follows:
Leading and trailing edge damage: Depth of nick x 10.
Face and camber: Depth of nick x 20. Refer to
Figure 6-4.
NOTE:
(5) 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.
(6) Inspect the repaired area with a 10X magnifying glass.
Make sure that no indication of the damage, file marks,
or coarse surface finish remain.
Maintenance Practices
Propeller Owner's Manual
BLADES THAT HAVE BEEN SHOT
PEENED (AS INDICATED BY A "PEBBLE
GRAIN" SURFACE) 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 AN APPROPRIATELY LICENSED
AND APPROVED REPAIR FACILITY
IN ACCORDANCE WITH HARTZELL
PROPELLER INC. ALUMINUM BLADE
MANUAL 133C (61-13-33).
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.
140
61-00-40
Page 6-12
Rev. 2 Jun/12