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A
747-400
MAINTENANCE MANUAL

(LIGHT HOUSING ASSEMBLY) 
(LENS ASSEMBLY)  (4 LOCATIONS) 
(5 LOCATIONS) 
UPPER ANTI-COLLISION LIGHT 
(TOP VIEW) 
A-A 

Upper Anti-Collision Light Installation
Figure 401

H47034
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747-400 MAINTENANCE MANUAL
 (d)  Loosen three sides of the insulation to get access to the light assembly.
 S 024-018
 (3)  Do these steps to remove the light assembly:
 (a)  
Disconnect the electrical connector (6) from the light subassembly (3).

 (b)  
Disconnect the ground wire (4) from the light subassembly (3).

 (c)  
Remove the screws (8) from the lens assembly (1).

 (d)  
Remove the lens assembly (1).

 (e)  
Remove the screws (7) from the light assembly (2).

 (f)  
Remove the light assembly (2).

 TASK 33-44-01-404-009
 3.  Light Assembly Installation (Fig. 401)___________________________
 A. Parts ~.............................................................................. | AMM | | AIPC | ................. ...........................| | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ...............................................................................| | 401 | 1 | Upper Anti-collision Light | 33-44-01 | 02 | 150 | | | 2 | Light Assembly | | | 195 | | | 3 | Light Assy. Mounting Screws | | | | | | 4 | Bonding Jumper | 33-44-01 | 02 | 180 | | | 5 | Hex Nut | | | | | | 6 | Power Cable | 33-44-01 | 02 | 190 | 2......…........…...................................…..........….......….......1
 B. References
 (1)  
24-22-00/201, Manual Control

 (2)  
25-22-03/401, Upper Deck Ceiling Panels

 (3)  
51-31-01/201, Seals and Sealing

 (4)  
SSM 33-44-01

 C. Consumable Materials
 (1)  A00247 Sealant - Chromate, BMS 5-95, Class B or C
 D. Access
 (1)  Location Zone 200 Ceiling - Upper Deck Passenger Compartment
 E. Procedure
 S 424-019
 (1)  Do these steps to install the light assembly:
 (a)  Put the light assembly (2) in its position.
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747-400 MAINTENANCE MANUAL
 (b)  
Install the screws (7).

 (c)  
Before you install the lens assembly (1), use the sealant (BMS 5-95, Class B or C) to apply a seal between the lens assembly and the skin panel (AMM 51-31-01/201).

 (d)  
Put the lens assembly (1) in its position.

 (e)  
Install the screws (8).

 (f)  
Connect the ground wire (4) to the light subassembly (3).

 (g)  
Connect the electrical connector (6) to the light subassembly (3).

 S 714-033
 (2)  Do a test of the light:
 (a)  
Supply electrical power (Ref 24-22-00/201).

 (b)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker:

 1)  P6 MAIN POWER DISTRIBUTION PANEL a) 6L31 RED ANTI-COLLISION LTS
 WARNING: DO NOT LET THE STROBE LIGHT FLASH DIRECTLY IN YOUR EYES.
_______ THE INTENSITY OF THE STROBE LIGHT WILL CAUSE DAMAGE TO YOUR EYES.
 (c)  
Put the BEACON switch on the P5 panel in the BOTH position.
　
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