P.O. Box 2426
Coppell, Tx. U.S.A. 75019
Tel (972) 393-9920
Fax (972) 393-9926
B. References
(1)
AMM 30-41-00/501, Flight Compartment Windows Anti-Icing System
(2)
AMM 30-42-01/401, Windshield Wiper Blade
(3)
AMM 30-42-02/401, Windshield Wiper Arm
(4)
AMM 56-11-00/801, Flight Compartment Windows
(5)
AMM 56-11-01/401, Flight Compartment No. 1 Window (Windshield)
C. Access
(1) Location Zone 221 Flight Compartment, Left - Flight Compartment Windows 222 Flight Compartment, Right - Flight Compartment Windows
D. Procedure - Examine the Windshield for Damage
S 866-002
WARNING: DO NOT TOUCH THE WINDSHIELD UNLESS THE CIRCUIT BREAKERS ARE
_______ OPEN AND THE WINDOW HEAT SWITCHES ARE OFF. FAILURE TO DO THIS CAN CAUSE ELECTRICAL SHOCK.
(1)
Put the window heat switches in the OFF positions.
S 866-003
(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 WD0 HEAT CONT 1R
2) 180H26 WD0 HEAT CONT 1L
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747-400
MAINTENANCE MANUAL
NO. 1 WINDOW
(WINDSHIELD)
THE MANUFACTURERS' DATA IS ON THE WINDOW ADJACENT TO THE FRAME
No. 1 Window (Windshield) Figure 601
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S 216-004
(3) Examine the windshield for chips in the glass layers (outer and crew shield).
NOTE: A chip occurs when there is removal of material from the
____ surface of the window pane not along a line. The chip in the window pane can have a circular shape or a "V" shape. The circular chips do not usually decrease the structural qualities of the glass. The "V" shape chips rarely occur in the chemically tempered glass; however, these chips can cause a windshield failure.
Chips in the glass surface layers are a cause for removal if they decrease the visual quality of the windshield.
Chips in the main glass layers are a cause for removal.
(a) Replace the windshield if the chips decrease the visual quality or if they are on the main glass layer (AMM 56-11-01/401).
S 216-005
(4) Examine the windshield for delamination.
NOTE: Delamination is the separation of the glass or acrylic
____ layers from the interlayer. Examine the window at an angle. The delamination is seen as a shiny, flat bubble. The delaminations are usually smooth, although the visual quality can decrease. The delamination is usually around the edges of the windows.
The delaminations do not cause the structural capacity of the windshield to decrease. It is not necessary to remove the windshield unless it decreases the visual quality.
(a) Replace the windshield if the delamination decreases the visual quality (AMM 56-11-01/401).
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