CAUTION: DO NOT USE METALLIC OXIDE ABRASIVES.
(a) If corrosion is excessive or terminal and/or cable is discolored from overheat, defective end portion of cable should be cut off and a new terminal installed if cable length is adequate. Refer to Terminal Installation, Notes Section of the Wiring Diagram Manual. If proper cable length cannot be obtained, fabricate a new cable assembly, using old cable as a sample.
D. Install Main Power Circuit Breakers in Control Center P6
(1)
Place breaker in correct mounting position so that breaker terminals are placed according to the tags on the cables. Align mounting holes and install four mounting screws.
(2)
Remove breaker terminal cover by removing two cover screws.
(3)
Install cables on terminal studs in same sequence and position as observed when removed in step B.(4). Observe proper terminal buildup. Tighten nuts on studs to torque values given on terminal cover.
CAUTION: DO NOT OVER TORQUE.
(4)
Connect electrical connector.
NOTE: Use care in joining connectors since bent or damaged pins can result in circuit breaker failure.
(5)
Install breaker terminal cover and tighten two screws.
(6)
Close load control center panels P6 and secure with attached screws.
(7)
On airplanes prior to incorporating SB 24-1037, gain access thru panel 3105 in nose wheel well and check that there is no interference between the APU circuit breaker wire bundle and flight control cable if wire bundle was displaced during APU generator circuit breaker replacement.
CAUTION: ABRASION BETWEEN THE APU GENERATOR WIRE BUNDLE AND THE FLIGHT CONTROL CABLE CAN CAUSE ARCING THAT MAY RESULT IN SEVERANCE OF THE FLIGHT CONTROL CABLE.
500
24-21-41 Page 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/84
H21326
525 Load Control Center-Right (P6) Circuit Breaker Location
Feb 15/71 Figure 401 24-21-41
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
2. Removal/Installation Main Power Circuit Breakers in Right ForwardCompartment, Outboard Nose Wheel Well
A. General
(1) The main power circuit breakers, the No. 1 and No. 2 generator breakers and the external power contactor are in the right forward compartments outboard of the nose wheel well. Access to the right forward compartments is gained through the nose wheel well by removing both the forward and aft access doors from the right-hand inner wall in the nose wheel well (Fig. 402).
B. Remove Main Power Circuit Breakers in Right Forward Compartment, Outboard Nose Wheel Well.
WARNING: BE SURE ALL POWER IS OFF BEFORE TOUCHING ANY CONDUCTOR IN COMPARTMENT.
(1)
Remove two access doors from right inner wall of the nose wheel well (Fig. 402).
NOTE: Only No. 1 generator breaker is accessible from the aft access door.
(2)
Remove circuit breaker cover plate by removing two flat head screws.
(3)
Remove six electrical cables from circuit breaker terminal studs using care not to drop such parts as nuts or washers into compartment.
(a)
Tag each wire as it is disconnected with correct identification to facilitate reconnection.
(b)
Observe the order and position in which cable terminals, plain washers, lockwashers, and nuts are placed on each terminal stud.
NOTE: Where more than one cable is attached to a stud, it may be advisable to use a lacing cord and tie parts together and tag for each stud.
(4)
Disconnect electrical connector.
(5)
Remove four breaker mounting screws and remove circuit breaker from compartment.
NOTE: Nutplates are provided on breaker supports.
500
24-21-41 Page 404 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 15/69
H29071
500 Main Power Circuit Breaker Installation
May 15/68 Figure 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 24-21-41 Page 405
C. Prepare to Install
(1)
Examine each cable terminal and adjacent cable for discoloration caused by overheating and for signs of corrosion.
(2)
Clean off corrosion with very fine sandpaper or a rubber eraser.
CAUTION: DO NOT USE METALLIC OXIDE ABRASIVES.
(a) If corrosion is excessive or terminal and/or cable is discolored from overheat, defective end portion of cable should be cut off and a new terminal installed if cable length is adequate. Refer to Terminal Installation, Notes Section of the Wiring Diagram Manual. If proper cable length cannot be obtained, fabricate a new cable assembly, using old cable as a sample.
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