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(11) Do the activation procedure for the thrust reversers (AMM 78-31-00/201).
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ENGINE WIRE HARNESS - APPROVED REPAIRS
______________________________________
1. General
_______
A. This procedure has three tasks for temporary repairs of the electrical harnesses on the power plant. These tasks are shown below in the sequence that they occur in this procedure:
(1)
A cable splice
(2)
A cable external jacket or braid repair
(3)
A cable replacement.
B.
These are the wire harness parts:
(1)
Wire - A single electrical conductor with insulation around it.
(2)
Cable - A group of wires in a metal shield and an insulation jacket.
(3)
Bundle - A group of cables attached together with lacing tape.
(4)
Harness - A single bundle or two or more bundles with connectors or terminal lugs attached to the ends of the bundles.
C.
Repair the connectors and connector contacts with the procedures in Chapter 20 of the Standard Wiring Practices Manual.
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2. Cable Splice Repair
___________________
A. General
(1) This procedure repairs broken wires or wires with damage. These are the limits for the wire repairs:
(a)
Replace the repaired cables when the harness is removed or during the engine's next shop visit.
(b)
Do not put a splice in a wire less than 6 inches (150 mm) from the clamp on the connector backshell.
(c)
Do not put a splice where it changes the position of the harness clamps or changes the location of the wire harness.
(d)
Do not put a splice in a cable with a steel outer braid.
(e)
Do not put a splice under a clamp or a drip loop.
(f)
Do not put a splice in a fire detection circuit.
NOTE: You can put a temporary splice in the circuit, however,
____ this must be replaced at the next scheduled maintenance check (WDM 20-10-13).
(g)
You can put a splice in a generator feeder cable as a temporary repair. Use the procedures in the Standard Wiring Practices Manual. You must repair the cable permanently or replace it during the next scheduled maintenance.
(h)
Splices must be moisture and abrasion resistant. Use a moisture-resistant tape wrap covered with an abrasion-resistant sleeve or tape when you do the repair.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(2)
This procedure is for a 2-wire cable with a braided shield. If you put a splice in a 3-wire cable, put the third splice in the cable so the insulation edges of the splices are all at least
1.3 inches (32 mm) away from each other. If you put a splice in a 1-wire cable without a braided shield, ignore the steps about the shield.
B.
Equipment
(1)
Wire stripper, 16 to 20 gauge -Strip Master 45092 (or equivalent),
Ideal Industries, Inc., 1008 Becker Pl.,
Sycamore, IL 60178, USA
(2)
Wire splice crimp tool (use as necessary for
all types of wire) - 46673
AMPS Inc., 2800 Fulling Mill, P.O. Box 3608,
Harrisburg, PA 17105, USA
(3)
Cable ferrule crimp tools (use the tools
shown in this table as necessary),
Thomas and Betts Corp., 920 Route 202,
Raritan, NJ 08869-1420, USA
中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 动力装置 POWER PLANT 2(103)
