D. Access
(1) Location Zone 221 Control Cabin, RH - No. 2 and 3 Left Side Windows 222 Control Cabin, LH - No. 2 and 3 Right Side Windows
E. Procedure
S 434-019
(1) Make sure that the thermostat retainer will hold the thermostat at the hot spot area near the red dot in the window.
(a) If the retainer is not in the nearest position to the red dot, do these steps: 1) Remove the 2 window bolts which hold the retainer bracket. 2) Move the bracket to the nearest position to the red dot. 3) Install the bolts.
S 434-020
(2)
Connect the wiring to the thermostat (2).
S 034-021
(3)
Lift the retainer spring (1) from the windowpane.
S 344-025
(4)
Apply a thin coat of thermal sealant to the window surface area under the thermostat.
S 424-023
(5)
Hold the thermostat (2) in location against the windowpane and lower the spring (1) against the thermostat.
S 864-024
(6)
Close 6E28, WINDOW HEAT PWR 2L&3R and 6E30, WINDOW HEAT PWR 2R&3L circuit breakers on the P6, Main Power Distribution Panel.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
OVERHEAT THERMOSTAT RETAINER - REPAIRS
______________________________________
1. General_______
A. This task is a procedure to repair the bonded overheat thermostat bracket retainer if it is loose or disconnected. In this procedure, you will clean and paint the bracket and join the parts with adhesive.
TASK 30-41-07-308-001
2. Overheat Thermostat Retainer Repair___________________________________
A. Consumable Materials
(1)
A00303, Adhesive - RTV 174
(2)
G00034, Cheesecloth, dry and lint-free
(3)
G00383, Paper, Abrasive - Aluminum Oxide, 240 grit or finer
(4)
A00168, Silicone Primer - RTV 1200
(5) B00148, Solvent - Methyl Ethyl Ketone (MEK), TT-M-261 B00312 Wool - Aluminum
B. References
(1)
AIPC 30-41-06, Fig. 2
(2)
SSM 30-41-01, SSM 30-41-02
(3)
WDM 30-41-21, WDM 30-41-31
C. Access
(1) Location Zone 221 Control Cabin, LH - No. 2 and 3 Left Side Windows 222 Control Cabin, RH - No. 2 and 3 Right Side Windows
D. Procedure
S 118-006
WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON YOUR
_______ SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. SOLVENTS MAY BE FLAMMABLE OR HARMFUL TO THE ENVIRONMENT. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
(1)
Use solvent, Series 84 (AMM 20-30-84) to clean the surface of the bracket which will touch the rubber retainer.
S 138-003
(2)
Use aluminum wool or aluminum oxide to make the surface of bracket rough.
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A 747-400 MAINTENANCE MANUAL
(3) S 118-007Clean the bracket with solvent, Series 84 (AMM 20-30-84) .
NOTE:____ Use clean cheesecloth to apply the solvent and then to make the surface dry. Do not let the solvent dry on the surface. Do the procedure more until the surfaces are completely clean.
(4) S 378-004Apply primer to those bracket surfaces which will touch the retainer. Let the primer air-dry for a minimum of 60 minutes or maximum of 4 hours.
(5) S 348-005Apply a uniform layer of adhesive over the bracket bonding surface and bond the parts immediately (apply sufficient pressure to make sure that there is complete contact).
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