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 B.  The FDAU status relay activates whenever it senses a ground on the FDAU BITE OUT line. Activation of the FDAU status relay causes the flight recorder OFF light to come on.
 C.  The power supply card within the FDR converts the airplane power to voltage levels required by the FDR.
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A 737-300/400/500MAINTENANCE MANUAL

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A 737-300/400/500MAINTENANCE MANUAL
 9. Operation
_________
 A. Flight Data Recorder System Input Schematics
 (1)  The FDAU receives input signals from sensors and various airplane systems. The inputs are as follows:
 (a)  
Analog inputs (Fig. 5) 1) Accelerometer 2) Aileron position transmitters 3) Brake Pressure Switches 4) Elevator position transmitters 5) Horizontal stabilizer position transmitters 6) Oil temperature bulbs 7) Rudder position transmitters 8) Speed brake handle position transmitter

 (b)  
Digital inputs (Fig. 6) 1) Autothrottle computer 2) AVM signal conditioner 3) Clock - captain 4) Digital air data computer 5) Digital stall warning computer 6) Digital to analog adapters 7) EFIS Control Panel 8) EFIS symbol generators 9) EIS Primary 10) EIS Secondary 11) Engine vibration signal conditioner 12) Flight control computers 13) Flight management computer 14) Ground proximity warning computer 15) Inertial reference units 16) Traffic Collision Avoidance System (TCAS)

 (c)  
Discrete inputs (Fig. 7) 1) Air/Gnd relay 2) Airplane ID shorting receptacle 3) Autothrottle computer 4) Column switching module

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D821CD
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M517 ACCELEROMETER
1
3
2M941 SPEED BRAKE HANDLEPOSITION SENSOR M675 FLIGHT DATA ACQUISITION UNIT POSITION TRANSMITTER
Flight Data Recorder System - Analog Input SchematicFigure 5
A 737-300/400/500MAINTENANCE MANUAL

M1321 EFIS SYMBOLM675 FLIGHT DATA ACQUISITION UNIT GENERATOR RIGHT
Flight Data Recorder System - Digital Input SchematicFigure 6
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A 737-300/400/500MAINTENANCE MANUAL
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M675 FLIGHT DATA ACQUISITION UNIT R384 STABILIZER TRIMCUTOUT RELAY
Flight Data Recorder System - Discrete Input Schematic
Figure 7 (Sheet 1)

　
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