(b)  
Make sure the lights are on.

 (c)  
Put the TAXI switch on the P5 Panel to OFF.

 (d)  
Make sure the lights are off.

 S 865-032
 (4)  Remove electrical power if it is not necessary (Ref 24-22-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 LANDING LIGHT LENS - REMOVAL/INSTALLATION
_________________________________________
 1.  General_______
 A.  This procedure contains these tasks:
 (1)  
A task for the removal of the light lens.

 (2)  
A task for the installation of the light lens.

 B.  The landing light lens assemblies are readily replaceable. Replacement procedures are identical for each of the four assemblies. This replacement does not effect adjustment of lamps and adjustment/tests are not required.
 C.  Nicks, scratches, or chips do not constitute reason for replacement of lens unless transmission of light is impaired.
 D.  Cracks of any size will propagate in flight due to thermal expansion and contraction and vibration. Lens should be replaced if direction of crack is such that it will cross a major portion of the lens. Minor cracks across a small portion of lens do not constitute need for immediate replacement of lens but replacement should be accomplished at earliest time convenient to using airline.
 TASK 33-42-01-004-001
 2.  Lens Removal (Fig. 401)____________
 A.  Access
 (1)  Location Zone
 511 Left Wing Leading Edge
 611 Right Wing Leading Edge

 B.  Procedure
 S 034-002
 (1)
Remove the screws that attach the lens assembly to the wing edge.

 S 034-003

 (2)  
Break the sealant at the slot between the lens assembly and the wing edge.

 (3)  
Remove the lens assembly.

 S 024-004
 TASK 33-42-01-404-004
 3.  Lens Installation (Fig. 401)_________________
 A.  References
 (1)  51-31-01/201, Seals and Sealing
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

INBOARD LANDING LIGHT

Landing Light Lens Installation
Figure 401

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747-400
MAINTENANCE MANUAL

 B. Consumable Materials
 (1)  
A00474 Silicone Rubber Sealant, DC 93-006

 (2)  
A00521 Primer, DC 1200

 C. Access
 (1)  Location Zone
 511 Left Wing Leading Edge
 611 Right Wing Leading Edge

 D. Procedure
 S 114-005
 (1)
Clean the surfaces on the wing and the lens per BAC5516.

 S 384-010

 (2)
Prime the surfaces on the wing with DC 1200 per BAC5000.

 S 394-011

 (3)  
Mix the DC 93-006 per BAC5516. Put the mixed DC 93-006 on the surfaces of the wing with a spatula.

 S 424-005

 (4)  
Put the lens in position on the wing.

 S 434-007

 (5)  
Put the frame over the lens and install with fasteners.

 S 884-012

 (6)  
Cure the DC 93-006 per BAC5000 and after cure trim off excess.

 S 394-008

 (7)  
Seal the slot between the lens assembly and the wing edge (Ref 51-31-01/201).

　
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