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D.  A priority is established within certain circuits to prevent different sounds from occurring at the same time and becoming garbled. The clacker and bell are not in the priority circuits; therefore, they may operate with each other or with any of the other sounds. Those sounds in the following priority list will be turned off by control circuits of sounds in a higher priority.
PRIORITY SOUND
1 Intermittent Horn 2 Steady Horn 3 Wailer 4 Buzzer
E.  The high chime, low chime or high-low chimes (not repeated) can be operated along with any of the sounds listed above. The high-low chime (not repeated) cannot be operated simultaneously with the low chime. The high and low chimes may be operated simultaneously. The high-low chime (repeat) can be operated simultaneously with the wailer or buzzer but will be turned off by the intermittent or steady horn control signals. If the high-low chime (repeat) is being used, the rest of the chime circuits are cut off; conversely, if one of the other chimes is being operated the high-low chime (repeat) is cut off.
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T53274 T53284 T53295
 Aural Warning System Schematic  567 
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565  Aural Warning System Schematic 
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563  Aural Warning System Schematic 
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3.  Landing Gear Warning System
A.  A warning horn sounds when the landing gear position is incorrect for the current operating conditions. Switches, operated by the movement of engine thrust levers or the flap follow-up drum, control the warning horn. Secondary control is provided through the landing gear module to ensure that the horn will not sound when the landing gear position is right for the current condition. The warning horn is mounted on the warning devices panel located on the right side of the aisle stand (Fig. 1).
B.  Landing Gear Uplock and Downlock Sensors - The landing gear uplock and downlock sensors (proximity switches) provide signals to the landing gear warning system (Fig. 1).
C.  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 and provide aural warning signals when the individual main gear is not locked or until the main gear position agrees with the landing gear control lever position.
D.  The nose gear 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 and provide aural warning signals. The nose gear downlock circuit also provides a ground to illuminate a green indicator light when the nose gear is down and locked.
E.  Thrust Lever Actuated Landing Gear Warning Switches - These switches are actuated he n the thrust levers are retarded and will actuate before the thrust levers contact the idle stop. An actuated switch completes a circuit to ground and sounds the warning horn if any gear is not down and locked.
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F.  Flap Operated Landing Gear Switch - The flap operated landing gear warning and flap up limit switches sound the warning horn if the flaps are in the landing position and all gears are not down and locked (Fig. 1). The switches are cylindrical-shaped, plunger-type microswitches, and are mounted on the outboard flap drive follow-up drum support. The flap drive follow-up drum is located at the top of the aft bulkhead in the right wheel well. Rotation of the follow-up drum turns a cam which raises the plunger to operate the switch.
　
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