33-42-21
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

Lens Assembly for the Inboard Landing and Runway Turnoff Lights
Figure 401

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A 737-300/400/500MAINTENANCE MANUAL
 CAUTION: DO NOT DO MORE DAMAGE TO THE LENS WHEN YOU REMOVE IT FROM
_______ THE WING. YOU WILL USE THIS LENS AS A TEMPLATE TO IDENTIFY THE HOLES FOR THE NEW LENS.
 (b)  Carefully pull the lens from the wing leading edge, so that no damage occurs to the seal or the lens.
 TASK 33-42-21-404-004
 3.  Lens - Installation (Fig. 401)
___________________
 A.  Standard Tools and Equipment
 (1)  
Sealing gun - 6-inch length cartridge, Senco Research

 (2)  
Sealant cutting tool - hardwood or plexiglass

 (3)  
Varnish brush - 1- or 2-inch

 (4)  
Spatula

 B.  Consumable Materials
 (1)  
A00091 Sealant - Silicone rubber 93-006

 (2)  
B00316 Naphtha - Aliphatic TT-N-95A

 (3)  
G00001 Parting Agent - Green Strippable Vinyl Coating 4A-183

 (4)  
G00111 Sheeting, Plastic Film - Mylar, .0075 Inch Thickness

 (5)  
G00142 Tape, Masking - Permacel 70

 (6)  
G00150 Tape, Teflon - Permacel P421

 (7)  
G00412 Tape, Masking - Permacel 85

 C.  References
 (1)  
AMM 27-81-00/201, Leading Edge Flap and Slat Control System

 (2)  
AMM 51-31-00/201, Seals and Sealing

 D.  Access
 (1)  Location Zone 303 Left Wing Inboard Leading Edge Including Slats 303 Right Wing Inboard Leading Edge Including Slats
 E.  Procedure
 S 114-067
 (1)  Do these steps to install existing lens assembly:
 (a)  Examine the seal on the surface of the wing leading edge. 1) If the seal is damaged replace it as follows:
 a)  Remove old seal and prepare surface for sealing (AMM 51-31-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 b) Make new seal (AMM 51-31-00/201). 2) If the seal is not damaged, remove and reapply parting agent or parting tape if required.
 (b)  
Put lens back into position.

 (c)  
Install and tighten screws.

 S 354-064
 (2)  Do these steps to prepare a new lens for installation:
 (a)  
Make a copy of the used lens on a piece of the mylar sheeting. 1) Attach the mylar sheeting to the used lens. 2) Make a mark around the contour of the lens and at the

 location of each hole. 3) Remove the mylar sheeting from the used lens.

 (b)  
Make the new lens the same as the used lens. 1) Attach the mylar sheeting to the new lens. 2) Make a copy of the contour and hole locations from the

 mylar sheeting to the new lens.

 (c)  
Drill countersunk holes in the new lens at the correct locations (Fig. 402).

 (d)  
If it is necessary, cut or grind the edges of the new lens.

 NOTE: Make the new lens the same contour and dimensions as the
____
 used lens.

 S 114-075
 CAUTION: MAKE SURE THE LENS ASSEMBLY AND THE LANDING LIGHT RETAINER DO
_______ NOT TOUCH. IF THERE IS NOT ENOUGH CLEARANCE, THEN READJUST THE LANDING LIGHT ASSEMBLY (AMM 33-42-31/501), KEEPING THE LAMP ASSEMBLY AS FAR AFT AS POSSIBLE. THE LENS WILL BREAK IF THERE IS NOT ENOUGH CLEARANCE.
　
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