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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
S 426-077
(2) If there are no holes in the Teflon sleeve, the inspection is complete.
(a) Do this task: Wiring Installation Procedure.
S 016-043
(3)
If there are holes in the Teflon sleeve, then remove the Teflon sleeve (SB 28-1120), to do an inspection of the wiring.
S 216-003
(4)
Look carefully at the part of the electrical cable that was installed in the conduit.
(a) If you can see the red, yellow, blue, or green wire insulation through the outer jacket of the electrical cable, then you must replace the electrical cable. Do not make repairs to the part of the electrical cable that goes in the conduit.
NOTE: You have two options on where you splice the new
____ electrical cable to the old electrical cable. 1) You can splice it where it joins the main wire bundle on the front spar. 2) You can splice it where the electrical cable is now spliced in the fuselage. Do not put a splice in a location that will be in the conduit or in the elbow. Make sure the splices and all wiring are a minimum of two inches from the control cables. Make the splices (including staggering them) as shown in SWPM 20-30-12. If you splice the wires at the front spar then you must use the procedure for a moisture proof splice in a fuel vapor area. Also, the splice must be after (away from the direction of the boost pump) the first wire clamp on the front spar. This will permit the Teflon sleeve (installed below) to go through the wire clamp. If you splice the electrical cable in the fuselage, then use a general purpose splice. Install the electrical cable as shown in SWPM 20-10-11.
NOTE: Refer to SB 28-1120 for acceptable wiring substitutions.
____
S 216-081
(5) If there is no evidence of arcing or exposed conductor, the inspection is complete.
(a) Do this task: Wiring Installation Procedure.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
S 356-083
(6) If you find any sign of electrical arcing or exposed copper wire on the electrical cable, then you must do one of these two options:
NOTE: Arcing can show as very small blackened holes in the
____ insulation, or as deformation or pitting of the copper wire. Worn areas with a black material around the edge is not a sign of arcing. The black material is aluminum oxide.
(a)
OPTION 1; Before the next flight, replace the section of the electrical conduit where the arcing occurred.
(b)
OPTION 2;
Do this task: Electrical Conduit Leak Test.
S 366-006
(7) If you smell or see fuel on the electrical cable, then you must find and correct the leak.
(a) If the leak is because of damage to the conduit, then replace the damaged conduit.
S 426-007
(8) If the electrical cable does not have any damage, you can install it again.
E. Wiring Installation Procedure
S 166-008
(1)
Use compressed air (30 psi maximum) to blow dirt out of the conduit.
S 086-009
(2)
Disconnect the string from the wiring.
S 166-010
(3)
Remove loose dirt from the electrical cable with a rag.
S 426-011
(4)
Install a new Teflon sleeve over the electrical cable.
NOTE: The sleeve must cover the part of the electrical cable
____ that is in the conduit. Make the sleeve sufficiently long to go through one wire clamp after each end of the conduit.
S 426-012
(5) AIRPLANES WITH A SINGLE CASE GROUND WIRE;
Do not put the case ground wire in the sleeve.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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