Repair Instructions ___________________
A. Remove the necessary fasteners in the area of the damaged skin.
Refer to SRM 51-40-02.
B. Cut and remove the damaged part of the fuselage skin as shown in
Figure 201. Refer to SRM 51-10-02.
(1) Make the cut in the shape of a rectangle with the sides parallel or
perpendicular to the stringer or frame.
(2) Make the corner radii of the cut a minimum of 0.50 inch.
C. Put the skin around the cut back to the initial contour.
D. Make the repair parts.
(1) Make the part [1] doubler. Refer to Table 201.
(2) Make the countersink washers for the initial fastener locations in
the initial skin. Refer to SRM 51-40-08.
E. Assemble the repair parts as shown in Figure 201.
F. Drill the necessary fastener holes. Refer to Table 202 for the fastener
type, diameter, and spacing. Refer to SRM 51-40-05 for the fastener hole
dimensions.
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G. Disassemble the repair parts.
H. Remove all the nicks, scratches, burrs, and sharp edges from the repair
parts and the bare surfaces of the initial parts.
I. Apply a chemical conversion coating to the repair parts and to the bare
surfaces of the initial parts. Refer to SRM 51-20-01.
J. Install the countersink repair washers with BMS 5-95 sealant at the
initial fastener locations. Refer to SRM 51-40-08.
K. Apply two layers of BMS 10-11, Type I primer to the repair parts and the
bare surfaces of the initial parts. Refer to SOPM 20-44-04.
L. Install the repair parts.
(1) Apply BMS 5-95 sealant to the mating surfaces. Refer to SRM
51-20-05.
(2) Install the rivets without sealant.
M. Apply a fillet seal to the repair parts on the internal and external
sides of the repair area with BMS 5-95 sealant. Refer to SRM 51-20-05.
N. Apply a finish if necessary. Refer to AMM 51-21-00/701.