(2)
Red paint stripes are applied to the main gear lower side strut and the lower downlock link. When a main gear is down and locked, the red paint stripes on the lower side strut will align with the red paint stripe on the lower downlock link (Fig. 3).
3. Control Lever Position Switch
A. The control lever position switch closes to complete a circuit to the landing gear electrical module when the control lever is moved to DN position (Fig. 4). The position switch is mounted within the control lever support structure. The switch assembly consists of a low-travel microswitch and roller-type switch actuator. The roller on the actuator contacts the inner end of the control lever to operate the switch when the lever enters the DN detent.
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Nose Landing Gear Mechanical Downlock Indication 500
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500 Main Landing Gear Mechanical Downlock Indication
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Control Lever Position Switch 524
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4. Landing Gear Uplock and Downlock Sensors
A. Six lock sensors (proximity switches) provide signals to the landing gear warning system. The sensors are two main gear downlock sensors, two main gear uplock sensors, a nose gear uplock sensor, and a nose gear downlock sensor.
B. Each main gear uplock sensor unit is mounted on the forward side of the uplock hook with the actuator attached to the uplock links. Each main gear downlock sensor unit is mounted on the outboard side of the side strut and utilizes an actuator fastened to the lock strut for an actuator. (See figure 5.) The main landing gear downlock sensors provide signals to the corresponding solid-state circuits in the landing gear module when the main landing gear is down and locked. The solid-state circuits will switch to a grounding condition when furnished a signal from the downlock sensor and thus provide a ground to illuminate the green indicator light for the individual main gear. The downlock and uplock sensors provide signals to the solid-state circuits so that the appropriate circuit will provide a ground to illuminate the red warning light when the individual main gear is not locked or until the main gear position agrees with the landing gear control lever position.
C. The nose gear uplock sensor is installed on the nose gear wheel well ceiling near the manual extension mechanism and the actuator is mounted on the lock link. The nose gear downlock sensor is installed on a sensor support beam with the actuator fastened to the lock brace. (See figure 6.) The sensors provide a signal to solid-state circuits in the landing gear electrical module when the nose gear is either up and locked or down and locked. The sensor signal will cause the circuit to remove ground from a red warning light and the light will go off. The absence of a signal from a nose gear sensor (nose gear not up and locked, or down and locked) will cause the circuit to provide a ground to illuminate the red warning light. The nose gear downlock circuit also provides a ground to illuminate a green indicator light when the nose gear is down and locked.
D. Deleted
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5. Operation
A. Control of the indicator and warning lights with respect to landing gear and control lever position is accomplished by solid-state circuits in the landing gear electrical module (Fig. 7 and 8). With the landing gear down and locked, the green indicator lights will come on. When the control lever is placed in UP position, the landing gear will unlock in preparation to retract and the green indicator lights will go off while the red warning lights will come on. The red warning lights will remain on while the gear are in transit until the gear position agrees with the control lever position (gear up and locked) at which time the lights will go off. With all landing gear up and locked, all warning lights will be off.
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