Piper Navajo PA-31 Service Manual page 186

PIPER NAVAJO SERVICE MANUAL
j. Activate another section adjacent to the bonded areas. Be certain to activate cement immediately
adjacent to the bond line. thus assuring complete adhesion throughout installation. When cement has reached
"proper state of tack." roll down thoroughly and continue until shield is completely attached.
k. Using a 2" sponge roller. go over entire surface. applying pressure and rolling from the center line or
leading edge outward to trailing edge of shield. With steel stitcher roller, roll thoroughly at trailing edge line
where shield meets the 1" masking tape. (Refer to Figure 4-39. View 5.)
1. To trim the erosion shield make initial cut into material overlapping the tape. using scissors held at
an angle. Using a "V" knife. or pair of scissors with blades opened to form a "V." neatly trim off excess shield
material overlapping edge of I" masking tape. applying light. uniform tension to trim material. (Refer to
Figure 4-39. View 6.)
m. If an air pocket or blister is formed. release air by inserting a hypodermic needle at 45
°
angle or less.
pointed toward center or leading edge. Apply finger pressure on blister to remove air and reroll using steel
stitcher. Remove all masking tape and clean excess cement from structure using MEK. wiping away from the
trailing edge. Prevent solvent from running under and loosening edges of erosion shield. Restitch shoe at its
trailing edge. using 1/8" steel stitcher Inspect complete trailing edge to see that it is firmly bonded. (Refer to
Figure 4-39. View 7.)
4-115 WING FRONT SPAR ATTACHMENT BULKHEAD REPAIR. (Refer to Figure 4-40 ) Should
inspection reveal excessive front spar attachment bulkhead cracks proceed with the following repairs:
a.
Remove any interior trim required to gain access to the front spar attachment bulkhead.
b Using the best shop practices. drill out the existing fasteners being careful not to elongate the holes
or otherwise damage the remaining pans.
c. Remove the existing reinforcement plate. P N 53016.
d. Remove the front spar attachment bulkhead. P N 41658-0 and -1.
e. Remove the front spar attachment channel. P N 40603-0 and -1.
f Using various shop aids. maintain the same locations relative to existing spar attachment fittings.
g. Use existing parts as templates to add holes into new parts.
h. Install new front spar attachment bulkhead. P N 52694-0 and -1.
i. Install new front spar attachment channel. P N 40603-2 and -3.
j. Install new reinforcement plate. P N 53016.
k. Using the same type of fasteners as those removed. or if required the next standard oversize fastener
may be substituted if clear of radius and minimum of one and one-half diameter edge distance is maintained.
proceed to secure all new parts in place.
1. Install any interior trim previously removed.
m. Make an appropriate logbook entry of this repair
Revised: 3/2/84
1H18
STRUCTURES
1H18