(4)
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 865-013
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A
737-300/400/500MAINTENANCE MANUAL
 INBOARD LANDING AND RUNWAY TURNOFF LIGHT LENS - REMOVAL/INSTALLATION
____________________________________________________________________
 1.  General_______
 A.  This procedure contains these tasks:
 (1)  
Lens Removal

 (2)  
Lens Installation

 B.  The installation of a lens does not change the adjustment of the lights.
 C.  There are two types of lenses:
 (1)  
One lens is attached with screws and nutplates.

 (2)  
The other lens is attached with quick-release fasteners.

 D.  Each lens is made of thermally tempered glass.
 (1)  
All surface damage decreases the resistance of the glass to cracks.

 (2)  
Damage is usually caused by particles that hit the surface of the lens.

 E.  You cannot repair a lens. A lens must be replaced if the damage is too much:
 (1)  
A crack in the lens:

 (a)  
When a crack in the lens starts, it will usually become larger automatically.

 (b)  
For a crack across the corner of the lens, schedule the replacement of the lens for the first available time. The crack must be one line that is less than 3.0 inches long.

 (c)  
For all other types of cracks, replace the lens before a subsequent flight of the airplane.

 (2)  
A chip or a dig in the lens:

 (a)  
A chip or a dig is an area on the lens where a small piece of glass has been removed.

 (b)  
Heat and vibration can cause a chip or dig to become a crack.

 (c)  
Replace the lens if the depth of a chip or dig is more than .01 inch.

 (3)  
A scratch in the lens:

 (a)  
A scratch is where a thin line of glass has been removed.

 (b)  
The ratio of depth to width is usually small.

 (c)  
Usually it is not necessary to change a lens which has small scratches.

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737-300/400/500MAINTENANCE MANUAL
 (d)  Replace the lens if it has a scratch with a depth of more than .01 inch.
 F.  If it is necessary, you can install a temporary lens until you can install a new glass lens. Because the temporary lens is not clear, the lights behind it will not give lighting. You install a temporary lens like a glass lens.
 (1)  Make a temporary lens from an aluminum sheet, then do this task: Lens - Installation.
 NOTE: It is best to use 2024-T3 aluminum that is 0.125 inch thick.
____
 TASK 33-42-21-004-001
 2.  Lens - Removal (Fig. 401)
______________
 A.  References
 (1) AMM 27-81-00/201, Leading Edge Flap and Slat Control System
 B.  Access
 (1)  Location Zone 303 Left Wing Inboard Leading Edge Including Slats 403 Right Wing Inboard Leading Edge Including Slats
 C.  Procedure
 S 494-070
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE LEADING EDGE FLAP AND SLAT LOCKS CORRECTLY. THE LEADING EDGE FLAPS AND SLATS CAN MOVE QUICKLY IF YOU DO NOT INSTALL THE LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  
Do this task: "Leading Edge Flap and Slat Locks Installation" (AMM 27-81-00/201).

 S 024-062

 (2)  
Remove the lens:

 (a)  Remove the lens screws or release the quick-release fasteners.
 NOTE: Make sure there is a lanyard attached to the lens.
____ If a lanyard is not attached, hold the lens to make sure it does not fall.
　
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