S 424-092
S 864-072
(a) P6 Main Power Distribution Panel
1) 6B17 WINDOW HEAT 1R
2) 6B34 WINDOW HEAT 1L
3) 6E28 WINDOW HEAT 2L & 3R PWR
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A
747-400 MAINTENANCE MANUAL
4) 6E30 WINDOW HEAT 2R & 3L PWR
(b)
P7 Overhead Circuit Breaker Panel
1) 7E1 WINDSHIELD WIPER L
2) 7E25 WINDSHIELD WIPER R
(c)
P180 DC Power Distribution Panel
1) 180H12 WDO HEAT CONT 1R
2) 180H26 WDO HEAT CONT 1L
S 014-019
(6)
Remove the lightshield assembly (Ref 25-13-01/401).
S 214-020
(7)
Install new nutplates in all the positions where the nutplates are gone or damaged.
S 954-049
(8)
Remove the protective paper cover from the two windshield surfaces.
S 014-022
(9)
Remove the hole plugs from the sling attach points on the windshield.
S 494-048
(10)
Attach the sling to the windshield (Fig. 403).
S 494-050
(11)
Tighten the bolts at each sling attach point to 20-30 pound-inches (Fig. 403).
S 114-051
(12)
Clean the mating surfaces of the pressure seal, frame, and center post with a cheesecloth that is moist with the aliphatic naphtha.
(13)
Dry the areas with a clean cheesecloth.
S 114-053
(14)
Do the two steps to clean the pressure seal, frame, and center post until the surfaces are fully clean.
S 424-104
(15)
On triplex windshields, install the short jumper wire on the lower outboard side of the windshield:
S 114-052
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747-400
MAINTENANCE MANUAL
CAUTION: MAKE SURE SLING ATTACHMENT IS SECURE AND WINDOW REMAINS IN
_______ A STATIONARY POSITION. DAMAGE CAN OCCUR TO THE WIRING DUE TO SUDDEN MOVEMENTS OF THE WINDOW. CONNECT ANY AND ALL ELECTRICAL CONNECTIONS WITHOUT CAUSING SUDDEN MOVEMENT OF WINDOW.
(a)
Put the jumper wire over the terminal block on the lower outboard edge of the windshield.
(b)
Put the terminal connector from the airplane power wire over the jumper wire. 1) Make sure the jumper wire and terminal connector are
aligned with the screw hole in the terminal block.
(c)
Install the screw and washer to attach the terminal connector to the terminal block.
(d)
Install the cap over the terminal connector.
H. Install the Windshield
S 214-078
(1)
Do a visual check of the window post and sill for cracks and corrosion.
S 424-054
(2)
Put the windshield (1) in the correct position.
S 394-077
(3)
Apply sufficient sealant (BMS 5-95) on all surfaces and countersinks under the head of the bolts (2).
NOTE: You must apply the sealant immediately before you install the
____ bolts. When you install the bolts, there must be a continuous extrusion of the sealant around the bolt heads.
S 424-057
(4) Install the bolts (2) firmly, but do not fully tighten, in the positions 65 to 63 and 13 to 15 (Fig. 404 )
NOTE: This will help align the window.
____
S 424-056
(5) Install the remaining bolts (2). Install the bolts (2) firmly, but do not fully tighten.
NOTE: There must be a minimum of three bolts (2) installed
____ between each bolt that is missing. There can be a maximum number of 15 bolts missing. At the locations where the bolts (2) have been kept out, replace the nutplates and the bolts (2) during the next windshield change procedure.
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