(3)
Position both outboard landing light switches to EXTEND. After lights have extended, position switches to ON. Check that lights come on.
(4)
Position both outboard landing light switches to RETRACT. Check that lights go out then retract.
(5)
Remove electrical power if no longer required.
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33-42-11 Page 504 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/75
INBOARD LANDING AND RUNWAY TURN-OFF LIGHT LENS ASSEMBLY (COVER) -REMOVAL/INSTALLATION
1. General
A. This procedure contains two tasks for the inboard landing and runway turn-off light lens assembly (cover) (referred to as the lens):
(1)
The removal of the lens.
(2)
The installation of the lens.
B. 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.
C. The replacement procedures are the same for the left wing and the right wing.
NOTE: The replacement of the lens does not change the adjustment of the light.
D. The lens is made of thermally tempered glass.
E. All surface damage decreases the resistance of the glass to cracks.
F. Damage is usually caused by particles that hit the surface of the lens.
G. You cannot repair the 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.
(d)
Replace the lens if it has a scratch with a depth of more than .01 inch.
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Feb 01/95 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 33-42-21 Page 401
NOTE: A temporary replacement lens assembly can be installed if a spare lens assembly is not available. Temporary lens assembly should be contoured, 0.125 inch thick, and 2024-T3 or equivalent. You can install temporary lens assembly on one or both sides. Install per lens assembly installation steps (Ref AMM 33-42-21/401). Consider lights behind temporary lens assembly inoperative (Ref 737-SL-57-045, dated June 7, 1994).
2. Inboard Landing and Runway Turn-off Light Lens Assembly (Cover) Removal (Fig. 401)
A. References
(1) AMM 27-81-00/MP, 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
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/MP).
(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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33-42-21 Page 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/99
G42477
501 Inboard Landing and Runway Turnoff Taxi Lights Lens Installation
Feb 01/95 Figure 401 33-42-21
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(b) Carefully pull the lens from the wing leading edge, so that no damage occurs to the seal or the lens.
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