Wingtip Navigation Lights  543 
33-43-0  Figure 1 (Sheet 1)  Feb 15/73 
Page 2 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

543  Wingtip Navigation Lights 
Feb 15/73  Figure 1 (Sheet 2)  33-43-0 
Page 3 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Navigation Lights Schematic  5C8 
33-43-0  Figure 2  Oct 20/85 
Page 4 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

NAVIGATION LIGHTS - TROUBLE SHOOTING
1.  General
A.  Trouble shooting the navigation lights is best accomplished during Adjustment/Test (33-43-0). Trouble shooting requires that power be available and appropriate circuit breakers be closed.
B.  Trouble shooting procedures are based on the assumption  that wiring is OK and electrical power is available. If the corrective action in the procedure does not correct the problem, check the wiring using the wiring diagram.
2.  Navigation Lights Trouble Shooting Chart
TROUBLE  PROBABLAE CAUSE  ISOLATION PROCEDURE  REMEDY 
Navigation light inoperative  Bulb burned out or faulty switch.  Replace bulb. If flight operates, bulb was burned out. If light still inoperative, replace switch.  Replace bulb.  Replace switch. 

501 
Nov 15/78  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  33-43-0 Page 101 

NAVIGATION LIGHTS - ADJUSTMENT/TEST
1.  Navigation Lights Test
A.  General
(1)  The following procedures provide instructions for testing al1 navigation lights and associated switching.
B.  Prepare to Test
(1)  
Apply electrical power.

(2)  
Check that STEADY circuit breaker on load control center P18 is closed.

(3)  
Open STROBE circuit breaker on load control center P18.

C.  Test Navigation Lights
(1)  
Place POSITION light switch on overhead panel P5 to STROBE & STEADY. Observe both colored and white navigation lights on each wing tip illuminate.

(2)  
Place POSITION light switch to OFF. Observe navigation lights go off.

(3)  
Place POSITION light switch to STEADY. Observe all navigation lights illuminate.

(4)  
Return POSITION light switch to OFF.

D.  Return Airplane to Normal
(1)  
Close STROBE circuit breaker.

(2)  
Remove electrical power if no longer required.

543 
Feb 15/73  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  33-43-0 Page 501 

WING FIXED NAVIGATION LIGHT - MAINTENANCE PRACTICES
1. General
A.  The following instructions refer to fixed navigation lights on outboard and rear wingtip areas. Refer to 33-45-11, for maintenance practices on the wingtip strobe lights as applicable. 
B.  The window covering the forward wingtip lights is carefully sealed against possible entry of fuel vapors from the wing and should not be removed for navigation light lamp replacement. A panel on underside of wingtip provides access for maintenance. 
C.  Lightning strike or static discharge across a glass lens will appear as a blistered or crazed area on the outside surface of the lens. This area is usually very shallow and has little or no effect on the structural integrity of the lens.
D.  Lenses experiencing lightning strikes or static discharge damage can continue in service providing the affected area depth does not exceed 50% of total lens thickness and does not adversely affect minimum required lighting.
2.  References
A.  Standard Wiring Practices Manual (SWPM), 20-30-00
3.  Relamp Wingtip Forward Fixed Navigation Lights (Fig. 201)
A.  Open applicable position light circuit breakers on P18-3 panel.
B.  Remove screws securing access panel at wingtip and remove access panel.
C.  Loosen two base assembly retaining captive screws.
NOTE: Do not remove lens assembly retaining screws.
D.  Remove base assembly. Ensure that index pin in base of light is not disturbed.
E.  Loosen pressure nut at end of shank two turns, and remove lamp noting position of silvered portion.
CAUTION:  DO NOT REMOVE PRESSURE NUT.
F.  Clean lens with clean, dry, soft cloth.
G.  Install lamp in bayonet socket making certain the silvered portion is in proper position, facing aft to airplane, and tighten pressure nut with finger pressure.
　
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