Wing Illumination Lights 501
33-41-11 Figure 201 May 15/77
Page 202
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
LANDING AND RUNWAY TURN OFF LIGHTS - DESCRIPTION AND OPERATION
1. General
A. Landing and runway turn-off taxi lights are adjusted to give optimum illumination when landing or taxiing. The lights are controlled by switches at the bottom of the pilots' forward overhead panel.
CAUTION: THE LANDING AND TURN-OFF LIGHTS ARE HIGH INTENSITY TYPE AND THE LIGHT INSTALLATIONS ARE NOT DESIGNED FOR CONTINUOUS DUTY IN STILL AIR. LIMIT OPERATION TO A CYCLE 5 MINUTES ON AND 5 MINUTES OFF WHEN AIRPLANE IS STATIONARY.
2. Inboard Landing Lights
A. Two inboard landing lights are in the wing leading edges near the fuselage. The lamps shine forward and down to the ground ahead of the airplane. (See figure 1.)
B. Power to the lights is from circuit breaker panel P18 at 115 volts ac and is reduced by transformers. (See figure 2.)
3. Outboard Landing Lights
A. A retractable landing light is on the outboard flap track fairing. The lamps shine forward parallel to the centerline of the airplane. (See figure 1.)
B. Power is supplied to the outboard landing lights the same as that supplied to the inboard landing lights. (See figure 2.)
C. The outboard landing lights are controlled by a three position switch on the forward overhead panel. In the EXTEND position, the lights will be extended. In the ON position, the lights can be turned on while they are in the extended position. In the RETRACT position, the lights will retract and will not illuminate when in this position. (See figure 2.)
4. Runway Turn Off Lights
A. Two runway turn-off lights are adjacent to and inboard of the inboard fixed landing lights. The lamps shine outward approximately 30 degrees, and have a beam width of 50 degrees. (See figure 1.)
B. Power to the runway turn off lights is from circuit breaker panel P18 at 28 volts ac. (See figure 2.)
C. The lights are individually controlled by switches on the overhead panel. (See figure 2.)
516
Feb 15/69 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 33-42-0 Page 1
Landing and Turn-Off Lights 501
33-42-0 Figure 1 Feb 15/67
Page 2
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
5. Nose Gear Taxi Light
A. The nose gear taxi light is on a bracket on the nose gear shock strut inner cylinder, and turns with the nose gear wheels. The light is controlled by a switch on the overhead panel.
B. Power to the nose gear taxi light is from circuit breaker panel P18 at 28 volts ac, through the circuit breaker marked NOSE GEAR TAXI LT. (See figure 2.)
527 Landing and Taxi Light Circuit
Feb 15/73 Figure 2 33-42-0
Page 3
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
LANDING AND RUNWAY TURNOFF LIGHTS - TROUBLE SHOOTING
1. General
A. Trouble shooting the landing and runway turnoff lights is easily accomplished independent of any other tests or functions. Trouble shooting will require that power be available and appropriate circuit breakers be closed.
CAUTION: DO NOT LEAVE LIGHTS ON MORE THAN 5 MINUTES. ALLOW AT LEAST 5 MINUTES BEFORE TURNING ON AGAIN.
B. All trouble shooting procedures are based on the assumption that wiring is OK and that electrical power is available. If the corrective action in the procedure does not correct the problem, check the wiring using the wiring diagram.
Landing and Runway Turnoff Lights Trouble Shooting Chart
501
Nov 15/78 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 33-42-0 Page 101
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Outboard landing Faulty switch, extend Check for 115V AC at ON Replace switch.
light will not extend circuit, or transformer (EXTEND) 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
Outboard landing Bulb burned out, Replace bulb. If light operates, Replace bulb.
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