EXTERIOR LIGHTING - DESCRIPTION AND OPERATION
1. General (Fig. 1)
A.  Exterior lights for area illumination include: wing illumination lights on each side of the fuselage, inboard landing lights on the leading edge of the wing, outboard landing lights in the outboard flap track housing, runway turnoff lights in the leading edge of the wing, and a taxi light on the nose gear.
B.  Exterior navigation (position) lights include red lights on the left wingtip, green lights on the right wingtip, and one white light located on each wingtip trailing edge.
C.  Two beacon (anticollision) lights are mounted on the upper and lower fuselage at approximately midcabin position. Motor-driven rotating beacon lights are used on some airplanes and solid-state xenon arc (flashtube) strobe lights are used on other airplanes.
D.  On some airplanes, strobe lights are on each wingtip and on the fuselage tail cone.
E.  Exterior light control switches are along the forward edge of the overhead panel P5.
F.  Power for the exterior lights is through circuit breakers on load control center P18.
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 Exterior Lighting  540 
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WING ILLUMINATION LIGHTS - DESCRIPTION AND OPERATION

1.  General (Fig. 1)
A.  Two wing illumination lights mounted flush with the fuselage forward of the wings and just above the cabin floor level are both controlled by a switch on the forward edge of the pilots' overhead panel, P5.
B.  Each wing illumination light consists of a housing assembly mounted in the fuselage and sealed against weather. A sealed beam lamp is mounted in an adjustable retainer assembly that is attached to the lamp housing. A lens assembly is mounted on the outside of the housing assembly and retained by four screws. A cable prevents the lens assembly from falling when removed for maintenance.
C.  Power for the wing illumination lights is 28 volt ac through a WING SCAN circuit breaker on circuit breaker panel P18. The lights are operable from external power when the external power switches in either the ON or GROUND SERVICE position.
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Wing Illumination Lights  501 
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WING ILLUMINATION LIGHTS - MAINTENANCE PRACTICES
General
A.  The wing illumination lights may be relamped, adjusted, and tested without the use of special tools or equipment. Paragraph 2 provides steps for relamping, par. 3 provides steps for adjustment, and par. 4 provides steps for testing.
2.  Relamp Lights (Fig. 201)
A.  Open EXT LIGHTS - WING SCAN circuit breaker on P18 panel.
B.  Loosen fasteners on lens assembly and suspend from cable.
CAUTION: PROTECT LENS FROM DAMAGE WHILE SUSPENDED.
C.  Remove two screws and remove outer lamp retainer.
NOTE: Do not turn adjustment screws.
D.  Remove lamp and disconnect wires from lamp terminals.
E.  Connect wires to lamp and install lamp.
F.  Place outer retainer on lamp and install two screws.
G.  Install lens assembly and tighten screws.
NOTE: Clean lamp and lens with clean dry cloth.
H.  Close circuit breaker opened in step A.
I.  Test lamp per par. 4.
3.  Adjust Lights (Fig. 201)
A.  Loosen fasteners on lens assembly and suspend from cable.
CAUTION: PROTECT LENS FROM DAMAGE WHILE SUSPENDED.
B.  Loosen four adjustment screws.
C.  Provide electrical power.
D.  Set WING light switch on pilots' overhead panel to ON. Observe that the light comes on.
E.  Adjust lamp position until center of beam is aimed as shown on Fig. 201.
WARNING: LAMP IS HOT. PROTECT HANDS WITH GLOVES TO PREVENT BURNING.
F.  Tighten four adjustment screws while holding light beam direction as illustrated (Fig. 201).
G.  Install lens assembly and tighten fasteners.
H.  Set WING light switch to OFF. Observe that the lights go off.
I.  Remove electrical power if no longer required.
4.  Test Lights (Fig. 201)
A.  Provide electrical power.
B.  Set WING light switch on pilots' overhead panel, P5, to ON. Observe that lights come on and beams are aimed on wing as illustrated (Fig. 201).
　
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