(d)  
Make sure the light comes on.

 (e)  
Put the BEACON switch on the P5 panel in the OFF position.

 (f)  
Make sure the light goes off.

 (g)  
Remove electrical power if it is not necessary (Ref 24-22-00/201).

 F.  Put the Airplane back to Its Usual Condition
 S 414-034
 (1)  
Put the insulation back in its initial position.

 S 414-053

 (2)  
On airplanes with an access panel,
 close the access panel in the ceiling panel.

 S 414-054

 (3)  
On airplanes without an access panel,
 install the ceiling panel (Ref 25-22-03/401).

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747-400 MAINTENANCE MANUAL
 UPPER ANTI-COLLISION LIGHT LENS - REMOVAL/INSTALLATION
______________________________________________________
 1.  General_______
 A.  This procedure contains has tasks:
 (1)  
Upper Anti-Collision Light - Lens Removal

 (2)  
Upper Anti-Collision Light - Lens Installation

 B.  To replace the lens of a lower anti-collision light, refer to Lower Anti-Collision Light (AMM 33-44-03/201 or AMM 33-44-03/401).
 TASK 33-44-02-004-001
 2.  Upper Anti-Collision Light - Lens Removal (Fig. 401)_________________________________________
 A.  References
 (1)  
AIPC 33-44-01 Fig. 2

 (2)  
AMM 51-31-01/201, Seals and Sealing

 B.  Access
 (1)  Location Zone
 200 Upper Half of Fuselage

 C.  Procedure
 S 864-040
 (1) Do one of these steps to remove electrical power from the light:
 (a)  
At the overhead panel, P5, set the switch to the off position and attach a DO-NOT-OPERATE tag.

 (b)  
Open the circuit breaker for the red anti-collision lights and attach the DO-NOT-CLOSE tag: 1) On the main power distribution panel, P6.

 S 034-041
 (2)  
Remove the sealing compound from around the lens assembly (AMM 51-31-01/201).

 S 024-048

 (3)  
Do these steps to remove the lens:

 (a)  Remove the lens retaining screws.
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747-400
MAINTENANCE MANUAL

UPPER ANTI-COLLISION LIGHT

Upper Anti-Collision Light Lens Installation
Figure 401

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H47037
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747-400 MAINTENANCE MANUAL
 (b)  
Remove the lens.

 (c)  
Remove the gasket.

 TASK 33-44-02-404-007
 3.  Upper Anti-Collision Light - Lens Installation (Fig. 401)______________________________________________
 A. Consumable Materials
 (1)  A00000 Compound - Sealing - BMS 5-142
 B. References
 (1)  
AIPC 33-44-01 Fig. 2

 (2)  
AMM 51-31-01/201, Seals and Sealing

 C. Access
 (1)  Location Zone
 200 Upper Half of Fuselage

 D. Procedure
 S 424-049
 (1)  Do these steps to install the lens:
 (a)  
Put the gasket in its position on the airplane skin.

 (b)  
Put the lens in its position.

 (c)  
Install the lens retaining screws.

 S 434-042
　
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