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A
747-400
MAINTENANCE MANUAL
50 60 70 80 90 100 110 120 130 140
TEMPERATURE IN `F
4 FOR SHOP HANDLING AND FLY AWAY
DO NOT DRY SEALANT ABOVE 140`F
DO NOT DRY SEALANT BELOW 50`F
Moisture Seal Repair
Figure 802 (Sheet 2)
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747-400 MAINTENANCE MANUAL
C. Prepare for the Repair of the Moisture Seal
S 868-030
WARNING: OPEN THE CIRCUIT BREAKERS AND TURN OFF THE WINDOW HEAT SWITCHES
_______ BEFORE YOU DO WORK ON THE FLIGHT COMPARTMENT WINDOWS. A FAILURE TO OPEN THE CIRCUIT BREAKERS AND TURN OFF THE WINDOW HEAT SWITCHES CAN CAUSE AN ELECTRICAL SHOCK TO PERSONS.
(1)
Put the window heat switches in the OFF position.
S 868-011
(2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P6 Main Power Distribution Panel
1) 6B34 WINDOW HEAT 1L
2) 6B17 WINDOW HEAT 1R
3) 6E28 WINDOW HEAT 2L & 3R PWR
4) 6E30 WINDOW HEAT 2R & 3L PWR
(b)
P180 DC Power Distribution Panel
1) 180H12 WDO HEAT CONT 1R
2) 180H26 WDO HEAT CONT 1L
S 358-012
(3) Do these steps to make a sealant removal tool:
(a)
Cut a strip of hard plastic, 0.75 X 6.0 inch
(b)
Cut one end to make a chisel type tool.
S 398-013
(4) Cut the contour in the duck-bill nozzle (Fig. 802).
D. Repair the Damaged Moisture Seal
S 218-014
(1)
Examine the seal that is on the windshield.
(2)
Remove the unwanted sealant with the sealant removal tool.
S 358-015
NOTE: If you are not sure of the sealant's quality, remove
____ approximately 1/8 inch of the sealant from the edge.
S 358-016
(3) Cut a groove between the seal and frame to a depth of the index tip on the contoured plastic sheet.
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747-400 MAINTENANCE MANUAL
S 118-033
WARNING:_______ BE VERY CAREFUL WHEN YOU USE ALIPHATIC NAPHTHA. ALIPHATIC
NAPHTHA IS FLAMMABLE. IF YOU INCORRECTLY USE THE ALIPHATIC
NAPHTHA, INJURY OR DAMAGE CAN OCCUR.
CAUTION:_______ DO NOT LET THE SOLVENTS TOUCH PLASTICS, CONTROL CABLES,
LUBRICATED AREAS, DECALS, OR PAINTS. IF THE SOLVENTS TOUCH
THESE AREAS, DAMAGE CAN OCCUR.
(4)
Use a clean cheesecloth that is moist with aliphatic naphtha to clean the seal and the adjacent glass surface.
S 958-018
(5)
Apply the tape on the glass and the window frame.
S 398-019
(6)
Use a flow gun with the duck-bill nozzle or spatula to apply a layer of PR1425 sealant on the seal. Apply the sealant smoothly.
NOTE: Pro seal 860 class B or BMS 5-95 may be used instead of
____ PR 1425.
S 398-020
(7)
Fill the clearance with the sealant as shown in Figure 802.
S 358-034
(8)
Use a spatula to make the sealant smooth.
S 958-021
(9)
Carefully remove the tape.
S 118-022
(10)
Use a cheesecloth that is moist with aliphatic naphtha to remove the unwanted sealant from the glass or window frame.
S 398-023
(11)
Let the sealant dry before you touch the seal.
S 218-024
(12)
Examine the seal for cracks on the two sides of the wiper ramp.
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