28-22-00
ALL ú ú 02 Page 612 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
S 356-084
(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 366-053
(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 426-054
(8) If the electrical cable does not have any damage, you can install it
again.
E. Wiring Installation Procedure
S 166-055
(1) Use compressed air (30 psi maximum) to blow dirt out of the conduit.
S 086-056
(2) Disconnect the string from the wiring.
S 166-057
(3) Remove loose dirt from the electrical cable with a rag.
ú
ú S 426-058
ú (4) If you found damage to the sleeve or to the wiring, 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 426-059
(5) AIRPLANES WITH A SINGLE CASE GROUND WIRE;
Do not put the case ground wire in the sleeve.
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28-22-00
ALL ú ú 01.1 Page 613 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 426-060
CAUTION:_______DO NOT SHRINK THE TEFLON SLEEVE WITH HEAT. HEAT CAN CAUSE DAMAGE TO THE INSULATION ON THE WIRE.
(6) If you are installing a non-jacketed electrical cable, then install two Teflon sleeves on it. Do these steps to install two sleeves:
(a)
Use the electrical cable to push the lacing tape through the larger Teflon sleeve.
(b)
Remove the electrical cable from the larger Teflon sleeve (keep the lacing tape in the sleeve).
(c)
Put the electrical cable through the smaller Teflon sleeve.
(d)
Make a crease (about one foot (30 cm) long) at the end of the smaller Teflon sleeve down to a smaller diameter (where you made the crease) so it will fit more easily in the larger Teflon sleeve.
(e)
Tie one end of the lacing tape to the creased end of the smaller Teflon sleeve. 1) Use the knot shown in SWPM 20-10-11 for "Assembly of Wire
Harnesses for High Vibration Areas" (Fig. 9).
(f)
Tie the other end of the lacing tape to a stationary object.
(g)
Pull and push the larger Teflon sleeve over the smaller Teflon sleeve. 1) Regularly smooth the larger Teflon sleeve down the length
of the smaller Teflon sleeve to prevent bunching.
S 426-061
(7) Replace the elbow and grommet if they have damage.
NOTE: Refer to SB 737-28-1120 for part substitution data.
____
S 486-062
(8) Connect the string back to the wiring and the sleeve.
(a) Put tape (as necessary) on the end of the wiring and socket contacts so that the wiring will go smoothly through the conduit.
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