737 AMM 飞机维护手册 结构 STRUCTURES(46)

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B.  Clean thoroughly surface and recess to which compound is to be applied. Cleaning must be accomplished in accordance with par 3, with solvent, Series 95 (Ref AMM/SOPM 20-30-95).
C.  Cover the skin adjacent to the recess with masking tape (Detail A, Fig. 206).
D.  Apply the compound with a flow gun, or a spatula.
NOTE:  Make certain no air is trapped in the recess during the filling procedure. Overfill the recess to allow for smoothing and leveling. Because of compound shrinkage, spot faced recess may require two fillings approximately eight hours apart to bring them level.
E.  Using a spatula, smooth the compound level with the masking tape (Detail B, Fig. 206).
F.  Remove the tape immediately after smoothing or leave in place for the curing period.
G.  Smooth down the edges of the compound which tend to lift the tape, and remove excess compound with a wooden or plastic tool (Detail C, Fig. 206).
NOTE:  Smoothing, fairing, and sealing materials shall not be applied over zinc chromate primer until primer has become hard and tough.
10.  Apply Electrical Fitting Seal
A.  Multiple Cutout

(1)  Absolute or Extensive Sealing Areas
(a)  
Clean the area where seal fittings will seal (par. 3).

(b)  
Pass wire bundle through the cutout provided.

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(c)  Encircle each individual wire in the bundle with coiled spacers. 1) Coil spacers two to four turns on each wire. 2) Position spacers on the wires so as to be completely enveloped by the seal
assembly when it is secured in the cutout (Detail A, Fig. 207).
NOTE:  Three wires or less can be separated by solid plastic wire separators. Four or more wires must be separated by wire coil separators.
(d)  
Place seal fitting halves around wires in the bundle with flanges on the on-pressure side.

(e)  
Position fitting so that wire separators are entirely within fitting.

(f)  
Place a strong piece of string about 8 inches long against the seal assembly parallel with the wires.

(g)  
Wrap fitting halves with three turns of 1-1/2 inch wide masking tape (Permacel Tape No. 70 or No. 85, American Tuck Tape No. 210, or equivalent) (Detail B, Fig. 207).

(h)  
Crimp the 1-1/2 inch wide masking tape around the seal assembly ends so as to center the wire bundle.

(i)  
Wrap crimped end with three turns of 3/4 inch masking tape (Detail C, Fig. 207).

(j)  
Position seal plate and filler on off-pressure side and secure seal assembly in place (Detail D, Fig. 207).

(k)  
Puncture paper masking tape over the most convenient injection hole in seal fitting.

(l)  
Inject sealant, using a sealant gun at a pressure of approximately 100 psi until sealant without visible evidence of entrapped air emerges from both notches in the outer periphery of the seal assembly mounting flanges.

(m)
Apply fillets of sealant along joints of the filler and seal over the fasteners in the center of the filler.

(n)  
Remove tape after sealant has cured (16 to 24 hours) by pulling rip string and unwinding.

(o)  
Where a coverplate is used to cover an unused opening, apply a faying surface seal between plate and structure (Detail E, Fig. 207).

(2)  Intermediate Sealing Area
NOTE:  In fuel vapor barrier areas the same procedure of installation as outlined in par. 10.A.(1) is followed except the coil spacers are not used.
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B.  Single Cutout

(1)  
Absolute or Extensive Sealing Area

NOTE:  Procedure is identical as outlined for multiple cutout except no seal plate or filler is involved.

(2)  
Intermediate Sealing Area

NOTE:  Procedure is identical as outlined for multiple cutout, except no seal plate or filler is involved.
11.  Apply Fuel Seal

A.  For information on integral fuel tank sealing, refer to Chapter 28, Fuel.
　
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