S 864-075

 (3)  
Connect the electrical wires to the control sensor. Tighten the fasteners with a maximum torque of 12-15 pound-inches.

 S 864-039

 (4)
Close these circuit breakers and remove the DO-NOT-CLOSE tags:

 (a)  
P6 Main Power Distribution Panel
 1) 6B17 WINDOW HEAT 1R
 2) 6B34 WINDOW HEAT 1L
 3) 6E28 WINDOW HEAT 2L & 3R PWR
 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

 (5)
Do a check of the windshield heater system (Ref 30-41-00/501).

 (6)
Do the operation check for the windshield wiper (Ref 30-42-00/501).

 S 734-040
 S 714-069
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747-400 MAINTENANCE MANUAL
 FLIGHT COMPARTMENT NO. 1 WINDOW (WINDSHIELD) - INSPECTION/CHECK
_______________________________________________________________
 1.  General_______
 A.  This procedure contains the following tasks:
 (1)  
Inspection of the No. 1 window (windshield) for damage.

 (2)  
Inspection of the No. 1 window (windshield) for proper installation.

 B.  The damage to be examined are cracks, chips, delamination, heater failure, evidence of arcing and seal leakage.
 C.  The installation check is to make sure all fasteners are correctly installed and tightened and the heater operates correctly.
 D.  The visual and structural qualities are very important. You must replace the windshield that has structural damage or that decreases the visual capacity.
 E.  You must replace the windshield that does not increase the temperature correctly when you apply heat.
 F.  AIRPLANES WITH PPG WINDSHIELDS; the inner layer of the tempered glass (crew shield) is not the structural layer. If nicks, scratches, or other damage do not prevent your visual capacity, it is not necessary to replace the windshield.
 G.  AIRPLANES WITH TRIPLEX WINDSHIELDS; the inner layer of the tempered glass (crew shield) is the structural layer. You must replace the windshield if the nicks or scratches are more that 0.002 inch in depth or the windshield damage prevents your visual capacity (Fig. 601).
 NOTE: When the airplane is pressurized, the glass layers usually move
____ forward. If there is deterioration of the polysulphide sealant, clearances will show as the glass moves away from the inner frame. This does not cause a decrease in the structural capacity nor is it necessary to replace the windshields.
 H.  You must remove a window if you find these conditions:
 (1)  
The windows do not become warm when you apply heat.

 (2)  
The window shows evidence of arcing near the window bus bars.

 (a)  Arcing is the flow of electricity between two points where there is a break in the circuit.
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747-400
MAINTENANCE MANUAL

 (b)  Signs of arcing are brown or black burn marks in the interlayer or cracks in the face ply.
 (3)  
The PPG windows have cracks or chips in the structural glass layer.

 (4)  
The Triplex windows have cracks or chips in the inner glass/crew shield.

 (5)  
Cracks in the outer glass layer limit visual capacity.

 (6)  
Cracks in the vinyl layer limit visual capacity.

 (7)  
Delaminations limit visual capacity.

 (8)  
Bad pressure leaks.

 (9)  
A decrease in the visual quality.

 TASK 56-11-01-206-001
　
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