S 414-018
(7)
Close the steering circuit breaker (C1027) of the nose landing gear on the P6 panel.
S 094-016
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A
737-300/400/500MAINTENANCE MANUAL
LANDING GEAR POSITION INDICATING AND WARNING SYSTEM -
_____________________________________________________ DESCRIPTION AND OPERATION
_________________________
1. General_______
A. The landing gear position indicating and warning system provides warning and indication for landing gear down and locked, landing gear not locked, and landing gear position not in accordance with control lever position. In addition, the down and locked position of each landing gear can be observed through inspection viewers. Green indicator lights come on when the landing gear are down and locked and the airplane is safe to land. Red warning lights come on and a warning horn sounds when the airplane is in a landing configuration and the landing gear are not down and locked (Chapter 31). The landing gear position indicating and warning system consists of the following:
(1)
Three green indicator lights, one for each main gear, and one for the nose gear indicate gear down and locked. The indicator lights are controlled by the landing gear lock and position sensors, in conjunction with solid-state circuits, to come on when the respective landing gear is down and locked. The indicator lights are mounted on the pilots' landing gear panel above the landing gear control lever (Fig. 1). A dimmer switch on the center panel is provided to reduce the indicator light intensity during night operations.
(2)
A LIGHTS test switch which tests the landing gear indicator and warning lights is mounted on the center panel.
(3)
Three red warning lights, one for each main gear, and one for the nose gear indicate an unsafe-to-land condition (Fig. 1). The warning lights come on when the landing gear and control lever positions do not coincide, when any landing gear is unlocked, or when the engine thrust levers are in idle range and the landing gear are not down and locked. The lights are controlled by the landing gear control lever position switch. Additional control of the lights is provided by the landing gear lock and position sensors on the landing gear and the solid-state circuits in the landing gear electrical module. The lights will remain on and cannot be turned off if the landing gear and control lever positions do not coincide or any landing gear is unlocked. A dimmer switch on the center panel is provided to reduce the indicator light intensity during night operations.
(4)
A warning horn sounds when the landing gear position is incorrect for the current operating conditions. For more information on the warning horn, refer to Chapter 31, Aural Warning and Call Devices.
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A 737-300/400/500MAINTENANCE MANUAL
Landing Gear Indicator and Warning Lights
Figure 1
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A 737-300/400/500MAINTENANCE MANUAL
2. Landing Gear Mechanical Downlock Indication
___________________________________________
A. Mechanical downlock indication of the landing gear is provided by observing the alignment of red paint stripes or arrows located on locking components of the landing gear (Fig. 2 and 3). The down and locked position of the landing gear can be observed from inside the airplane through landing gear downlock viewers. For more information on the viewers, refer to Chapter 56, Viewers and Observation Windows.
(1)
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