| 摘要 |
An apparatus monitors doors on an aircraft. A system monitor has a circuit with an interrogation switch, a receiver, a plurality of red lights and at least one green light source. A plurality of door sensor units each has a housing with a protruding limit switch having a door-open position and a door-closed position. Each limit switch is in a sensor circuit with a battery and a transmitter. The sensor circuit transmits with a unique transmission if the limit switch is in the door-open position. If the system monitor receives a door-open position signal from one of the door sensor units when the interrogation switch is activated, a corresponding one of the red lights is illuminated, and if the system monitor receives all door-closed position signals, the green light is illuminated. |
| 主权项 |
1. An apparatus for monitoring doors on an aircraft comprising
a system monitor having a circuit with an interrogation switch, a receiver, a plurality of light sources of a first color and at least one light source of a second color, the system monitor receiver tuned to receive a door open signal when the interrogation switch is activated, a plurality of door sensor units, each having a housing with a transmitter, a protruding limit switch, the limit switch having a door-open position and a door-closed position and being in a sensor circuit with a battery such that battery voltage is applied to the transmitter when the limit switch is in the door-open position, so that when the limit switch is in the door-open position transmit a transmission pipe signal with a unique identifier, each door sensor unit having different unique identifier, whereby if the system monitor receives a transmission from one of the door sensor units of a door-open position signal, a corresponding one of the plurality of lights of the first color is illuminated, and if the system monitor receives no signals from any of the door sensor units, the light of the second color is illuminated. |
