D04514
GUN 051 ú
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ú CONFIG ú 01 Page 2 ú Dec 20/93
A
757
MAINTENANCE MANUAL
FLIGHT COMPARTMENT
FLIGHT RECORDER TEST PLUG CONNECTOR, D00761 (FORWARD SIDE OF P61 PANEL)
E
TEST PLUG
Flight Data Recorder System - Component Location
Figure 1 (Sheet 2)
GUN 051 ú
31-31-00
ú CONFIG ú 01 Page 3 ú Dec 20/93
D04516
A
757
MAINTENANCE MANUAL
B. Control Display Unit (CDU)
(1) The CDU (Ref 34-61-00) provides controls and keys for inserting documentary data into the DMU sub-circuit assembly and requesting data display of any DFDAMU parameters. It also provides the means to request a print command for printout on the printer. The CDU consists of a keyboard, function switches, and a data display.
C. Accelerometer
(1)
The flight recorder accelerometer is installed in the left wheel well.
(2)
The accelerometer provides vertical, lateral, and longitudinal acceleration signals to the DFDAMU. The accelerometer measures vertical acceleration from -3G to +6G. It measures lateral and longitudinal accelerations from -1G to +1G. Excitation for the accelerometer is 28 volts dc supplied by the DFDAMU.
D. Flight Recorder/System Relays.
(1) The flight recorder system relays include the left and right ENG START-TO-STOP relays, SYS NO. 2 AIR/GND relay, the FLT REC ADC I/P SWITCHING relay and the FLT REC EFIS I/P switching relay. The ENG START-TO-STOP relays provide AC power to the DFDR and DFDAMU when the corresponding engine is running. The SYS NO. 2 AIR/GND relay also provides AC power to the DFDR and DFDAMU when the airplane is airborne. The FLT REC ADC I/P SW and EFIS I/P SWITCHING relays select the ADC and EFIS inputs to the DFDAMU either from normal or alternate source as selected by the captain.
E. DFDAMU's DAU Sub-circuit Assembly
(1)
The DFDAU is a microprocessor controlled unit that sequentially receives specific data from various airplane systems and sensors. The acquired data is scaled and formatted into a digital data format. The DFDAU outputs this data to the DFDR for recording.
(2)
The DAU sub-circuit assembly is a microprocessor controlled unit that sequentially receives specific data from various airplane systems and sensors. The data is scaled and formatted into a digital data format. The DAU outputs this data to the DFDR for recording
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