OPERATION AND INSTALLATION MANUAL
EN-1320
6.5. REPAIR OF NICKS OR GOUGES ON BLADES
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 6-5.
FIGURE 6-5
WARNING:
Rework which involves cold working the metal, resulting in concealment of a
damaged area, is not acceptable. A stress concentration may exist which can
result in a blade failure.
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.
Repairs to the blade thrust or camber should be made in the same manner as
above. Repairs that form a continuous line across the blade section (chordwise,
blade leading to trailing edge) are unacceptable.
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.
NOTE:
Leading edge includes the first 10% of chord from the leading edge. The trailing edge
consits of the last 20% of chord adjacent to the trailing edge.
After filing or sanding of the damaged area, the area must then be polished, first with
emery cloth, and finally with crocus cloth to remove any traces of filing.
61-10-20
INSPECTIONS
Page 6-9
2017-10-06
