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26-19-01
ALL ú ú 04 Page 404 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 034-022
(5)
Disconnect the electrical connection or splice of the switch where applicable.
S 164-024
(6)
Remove the sealant around the switch on the top, the bottom of the midspar, and around the electrical connection where applicable.
S 164-025
(7)
Remove the terminal lugs where applicable.
S 034-006
(8)
Remove the nut and four washers.
S 024-007
(9)
Remove the thermal switch.
TASK 26-19-01-404-008
3. Install the Thermal Switch (Fig. 401)_____________________________________
A. Consumable Material
(1)
A00280 Sealant - RTV 3145
(2)
A00247 Sealant - BMS 5-95
(3)
B00184 Sealant - BMS 11-7
(4)
G00507 Cloth - Lint Free
B. References
(1)
AMM 26-19-00/501, APU Duct Overheat Detection System
(2)
AMM 51-31-01/201, Seals and Sealing
(3)
AIPC 26-14-10, Fig. 1
(4)
AIPC 26-19-00, Fig. 1
(5)
WDM 20-30-12, Standard Practices (Assembly of Splices)
(6)
WDM 49-52-21
(7)
SSM 49-52-02
C. Access
(1)
Location Zone
137 Body Landing Gear Well L.H.
142 Aft Cargo Container Compartment, LH
145 Bulk Cargo Compartment, LH
311 Area Aft of Pressure Bulkhead, LH
313 Stabilizer Torsion Box Compartment, LH
(2)
Access Panel 193J Keel Beam Access Panel 312AR Horizontal Stabilizer Jackscrew Access Door 731 Door - Wing Landing Gear - Center Section Inboard Left 751 Door - Body Landing Gear - Aft Inboard Left 752 Door - Body Landing Gear - Aft Outboard Left
D. Procedure
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
26-19-01
ALL ú ú 01 Page 405 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 114-027
WARNING:_______ DO NOT BREATHE FUMES. SOLVENTS ARE POISON AND FLAMMABLE. USE
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 midspar around the switch mounting hole with BMS 11-7 solvent and a clean lint free cloth.
S 424-026
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)
Install the thermal switch on the airplane frame.
S 424-010
(3)
Install the switch with a washer and a locknut if it is applicable.
S 434-028
(4)
Tighten the nut.
S 394-029
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 midspar if applicable.
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