747-400 AMM 飞机维护手册 动力装置 POWER PLANT 2(107)

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 7)  Wind two layers of the electrical silicone tape (Scotch 92) for abrasion protection with a 50% overlap on each turn of the tape.
 NOTE: Wind the second layer in the opposite direction
____ to the first layer. The tape wrap must be sufficiently tight to give a moisture-resistant seal.
 a) Extend the tape a minimum of one-half inch more than each end of the inner tape. 8) For the repair of a 1-wire cable without a braided shield do these steps (Fig. 803):
 NOTE: Do not do these steps if the cable has a braided
____
 shield.

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TWO LAYERS OF MOISTURE RESISTANT TAPE

Moisture Resistant Tape Wrap
Figure 802

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A

Abrasion Resistant Tape Wrap and Lacing Tape
Figure 803

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C20077
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a)  Wind two layers of the electrical silicone tape (Scotch 62) directly around the splice with a 50% overlap on each turn of the tape.
 NOTE:____ Wind the second layer in the opposite direction to the first layer.
 b) c)  Extend the tape one inch more than each end of the inner tape.With the lacing tape, make a clove hitch and a square knot on each end of the tape.
 NOTE:____ Tighten the clove hitch before you tighten the square knot.
 (g) (h) (i)  d) Cut the free ends to 0.25-0.50 inch (6-12 mm).Make sure the metal strands of the braided shield are straight.Put the inner ferrule near the end of the cable insulation and fold the braided shield back over the ferrule (Fig. 804). 1) Make sure the metal strands of the braided shield have an equal proportion around the ferrule.Put one end of the tubular braid on the metal strands of the shield.
 1)  Move the outer ferrule over the tubular braid and the inner ferrule.
 2)  Use the crimp tool to attach the outer ferrule on the inner ferrule and braided shield (Fig. 805).
 NOTE:____ Make sure the braided shield stays between the inner and the outer ferrules when you install the outer ferrule.
 (j) (k) (l)  Pull the tubular braid tight across the splice area.Install the inner and outer ferrules on the other end as shown in the steps above.Cut the unwanted braid near the outer end of the two outer ferrules.
 (m)  For abrasion protection, wind two layers of the electrical silicone tape (Scotch 62) directly around the splice (Fig. 806).
 NOTE:____ Wind the second layer in the opposite direction to the first layer with a 50% overlap on each turn of the tape.
 1)  Extend the tape a minimum of one-half inch (13 mm) more than each end of the inner tape.

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TUBULAR BRAID AND OUTER FERRULE INSTALLATION

B

BRAIDED SHIELD

INNER FERRULE INSTALLATION

C
Tubular Braid Installation
Figure 804

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