(2)
Cracks or chips in the inner glass pane.
(3)
Cracks in the outer glass pane.
(4)
Cracks in the vinyl ply that prevent vision through the window.
(5)
Scratches more than 0.002 inch in depth.
(6)
Delaminations limit visual capacity.
(7)
Bad pressure leaks.
(8)
A decrease in the visual quality.
TASK 56-11-02-206-001
2. Flight Compartment No. 2 and 3 Windows Inspection_________________________________________________
A. References
(1)
AMM 30-41-00/501, Flight Compartment Window Anti-Icing System
(2)
AMM 56-11-00/801, Flight Compartment Windows
(3)
AMM 56-11-02/401, Flight Compartment No. 2 and 3 Windows
B. Access
(1) Location Zones 221 Flight Compartment, Left Flight Compartment Windows 222 Flight Compartment, Right Flight Compartment Windows
C. Prepare for Inspection
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MAINTENANCE MANUAL
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 AN ELECTRICAL SHOCK.
(1)
Put the window heat switches in the OFF position.
S 866-003
(2)
Open the circuit breakers that follow 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
D. Procedure - Examine the windows
S 216-004
(1) Examine the Triplex windows for scratches:
NOTE: The tempered glass inner pane (crew shield) is load bearing
____ and must be replaced if nicks or scratches exceed 0.002 inches in depth or visibility is impaired.
(a) Make sure there are no scratches more than 0.002 inch in depth.
S 216-013
(2) Examine the PPG windows for scratches.
NOTE: The tempered glass inner pane is a non-load bearing and
____ may be nicked, scratched, or have other damage provided visibility is not impaired.
S 216-011
(3) Examine the windows for cracks:
(a) Replace the windows if you find cracks which extend from the edge of the metal insert to the inner crew shield (AMM 56-11-02/401).
NOTE: The area in question will appear gray or brown,
____ the window should be replaced prior to further flight.
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747-400 MAINTENANCE MANUAL
(b) Replace the window if the pilot's vision is no longer acceptable or if the following conditions are satisfied (AMM 56-11-02/401): 1) Condition begins from the edges of the outer glass pane, is
visible from the outside of the airplane (or from the inside only if it extends past the insert) and appears initially whitish and turns yellow, breaking up the interlayer with opaque edges on the interlayer segments.
NOTE: The condition is Urethane aging and airplane
____ may continue service until replacement window is available or pilot's vision is no longer acceptable.
2) There are no cracks or other signs of distress at the inner (toward the middle of the window) edges of the insert.
S 216-014
(4) Examine the windows for chips.
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