(2)
Access Panel 191CL Panel - Access 191KL Panel - Access - Fairing 192CR Panel - Access 192KR Panel - Access - Fairing 452BL Upper Midspar Pressure Relief, Engine 1 462BL Upper Midspar Pressure Relief, Engine 2 462EL Mid Lower Strut, Engine 2 472BL Upper Midspar Pressure Relief, Engine 3 472EL Mid Lower Strut, Engine 3 482BL Upper Midspar Pressure Relief, Engine 4 521AB Lower Inbord Nacelle, Left 521EB Lower Skin Leading Edge, Left 621AB Lower Inboard Nacelle, Right 621EB Lower Skin Leading Edge, Right 731 Door - Wing Landing Gear - Center Section Inboard Left 741 Door - Wing Landing Gear - Center Section Inboard
Right 751 Door - Body Landing Gear - Aft Inboard Left
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
E. Procedure
S 114-012
WARNING: DO NOT BREATHE FUMES. USE
_______SOLVENTS ARE POISON AND FLAMMABLE. SOLVENTS WITH SUFFICIENT AIR. SUPPLY APPROVED RESPIRATORY PROTECTION. DO NOT GET SOLVENT IN EYES. DO NOT TOUCH SOLVENT WITH SKIN OR CLOTHING. USE PROTECTIVE EQUIPMENT. KEEP FLAMMABLE MATERIALS AWAY FROM SPARKS AND FIRE.
CAUTION: DO NOT ALLOW SOLVENTS TO CONTACT PLASTICS, CONTROL CABLES,
_______ LUBRICATED AREAS, DECALS, PAINTS, MARKINGS, OR DAMAGE MAY RESULT.
(1) Clean the surface of the bracket around the switch mounting hole with BMS 11-7 solvent and a clean lint free cloth.
S 424-013
CAUTION:_______DO NOT TIGHTEN THE NUT MORE THAN 18 POUND-INCHES. MORE THAN 18 POUND-INCHES OF TORQUE WILL CAUSE DAMAGE TO THE SWITCH.
(2) Put the washer on the thermal switch.
NOTE: Use phenolic washer for the WLE, and aluminum washer for the
____ Center Duct or above the Strut and for the Nacelle Strut.
S 434-042
CAUTION: SL 26-041 THERMAL SWITCHES;
_______ THERMAL SWITCHES ARE COLOR CODED TO ASSIST IN THE CORRECT REPLACEMENT OF THE THERMAL SWITCH. IF THE WRONG THERMAL SWITCH IS INSTALLED, FALSE OVERHEAT WARNINGS MAY OCCUR OR OVERHEAT CONDITIONS MAY NOT BE DETECTED.
THE LOCATION OF THE THERMAL SWITCHES ARE:
GREEN (200 DEGF), WLE.
YELLOW (250 DEGF), CENTER DUCT AND ABOVE STRUT.
RED (300 DEGF), NACELLE STRUT.
(3) Install the switch and washer on the bracket. Attach the washers and locknut.
NOTE: If color coded switches are installed, make sure the
____ correct color coded switch is installed. Use a Green color coded switch for the WLE, a Yellow switch for the Center Duct or above the Strut, and a Red switch for the Nacelle Strut.
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ALL ú ú 14 Page 410 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 424-037
(4) Tighten the locknut. S 394-015
WARNING:_______ DO NOT BREATHE THE FUMES. SOLVENTS ARE POISONOUS AND
FLAMMABLE. USE SOLVENTS WITH SUFFICIENT AIR. USE APPROVED
RESPIRATORY PROTECTION. DO NOT GET SOLVENT IN EYES. DO NOT
TOUCH SOLVENTS WITH SKIN OR CLOTHING. USE PROTECTIVE EQUIPMENT
AS IT IS NECESSARY. KEEP FLAMMABLE MATERIALS AWAY FROM SPARKS
AND FIRE.
CAUTION:_______ DO NOT ALLOW SOLVENTS TO CONTACT PLASTICS, CONTROL CABLES,
LUBRICATED AREAS, DECALS, PAINTS, MARKINGS, OR DAMAGE MAY
RESULT.
(5)
Apply the sealant BMS 5-95 around the base of the switch on top of the midspar, and over the stud and the fastener on the bottom of the mid spar if applicable.
S 434-039
(6)
Make a splice on the switch pigtails to the airplane wire bundle with an NAS 1387 splice. Install and seal the splice. Refer to high temperature requirements (WDM 20-30-12).
S 434-017
(7)
Connect the electrical wires.
S 414-040
(8)
Apply the sealant, RTV-3145, PR 1913 or PR 1933, around the electrical connections on the base of the switch if it is applicable.
S 414-019
(9)
Install the wing access panels where removed. Refer to AMM 06-09-08/201 for access door identification.
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