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light is inoperative  faulty switch, transformer, or extend circuit  bulb was burned out. If light still inoperative, replace in order: switch, transformer, landing light circuit assembly  Replace switch, transformer, landing light circuit assembly 
Outboard landing  Faulty switch, retract  Check for 115V AC at OFF  Replace switch. 
light will not retract  circuit, or transformer  (RETRACT) terminal of switch on pilot’s overhead panel. If no voltage, replace switch. If voltage is OK, replace transformer and then landing light circuit assembly  Replace transformer. Replace landing light circuit assembly 
Inboard landing  Bulb burned out,  Replace bulb. If light operates,  Replace bulb, 
light inoperative  faulty switch or transformer  bulb was burned out. If light still inoperative, replace switch. If light still inoperative, replace transformer.  Replace switch. Replace transformer 
Runway turnoff  Bulb burned out or  Replace bulb. If light operates,  Replace bulb, 
light inoperative  faulty switch  bulb was burned out. If light still inoperative, replace switch  Replace switch 

501 
33-42-0  Nov 15/78 
Page 102 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Nose gear taxi light inoperative  Bulb burned out or faulty switch.  Replace bulb. If light operates, bulb was burned out. If light still inoperative, replace switch.  Replace bulb. Replace switch. 

503 
Nov 15/78  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  33-42-0 Page 103 

OUTBOARD LANDING LIGHTS - MAINTENANCE PRACTICES
1. General
A.  Each landing lamp at the wing flap fairing can be removed without disturbing the adjustment of the lamp. The following procedure is applicable to relamping the outboard landing light on either side.
2.  References
A.  Standard Wiring Practices Manual (SWPM), 20-30-00
3.  Prepare Outboard Landing Light for Relamping (Fig. 201)
A.  Provide electrical power.
B.  Check that applicable outboard landing light circuit breaker on P18-3 panel is closed.
C.  Extend landing light by positioning applicable outboard landing light switch to ON or EXTEND position on certain airplanes.
D.  Open applicable outboard landing light circuit breakers on panel P18-3 panel.
4.  Relamp Outboard Landing Light (Fig. 201)
A.  Loosen the three tension spring screws in back of light assembly.
B.  Remove tension ring and gasket around outer edge of lamp on front side.
C.  Pull lamp forward and remove wires from screw terminals on back.
D.  Connect wires to screw terminals on lamp.
E.  Seal the electrical terminals for a fuel vapor area (SWPM 20-30-00).
WARNING:  MAKE SURE YOU SEAL EACH BARE ELECTRICAL CONNECTION TO PREVENT AN EXPLOSION OF THE FUEL FUMES. AN EXPLOSION CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
F.  Mount lamp in correct position inside light assembly.
500 
Feb 01/95  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  33-42-11 Page 201 

G.  Install tension ring, with gasket on inner side, around outer edge of lamp.
H.  Tighten three tension spring screws on back side of light assembly.
5.  Restore Airplane to Normal
A.  Apply electrical power.
B.  Close applicable outboard landing light circuit breaker on load control center P18. Check that light illuminates by positioning light switch to ON.
C.  Position outboard landing light switch on forward overhead panel to OFF or RETRACT position. Light will extinguish and retract.
D.  Remove electrical power from airplane, if no longer required.
500 
33-42-11 Page 202  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/75 

500  Outboard Landing Light Lamp Installation and Adjustments 
Aug 15/68  Figure 201  33-42-11 
Page 203 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

OUTBOARD LANDING LIGHT - REMOVAL/INSTALLATION
1. General
A.  Outboard landing lights are installed in trailing edge flaps, and are retractable when not in use. The following procedure is applicable to the landing light on either side.
2.  Prepare for Removal
A.  Pressurize hydraulic system A and set flap lever on control stand to 40 unit position (Ref Chapter 27-51-00 M/P).
　
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