STA
BULKHEAD)
947
FLIGHT DATA
RECORDER
SEE A
CEILING PANEL
PILOTS' AFT
OVERHEAD
PANEL, P5
SEE B
LOAD CONTROL
CENTER, P18
PUSHBUTTONS
NEON LIGHT
EVENT
REPEAT
2 4 7 5 2 8
RECORDING
HOURS
REMAINING
TRIP NUMBER DATE
UNDERWATER
LOCATOR BEACON TRIP AND DATE ENCODER
OFF LIGHT
REMOTE READOUT AND TEST SET CONNECTOR
MACH FLIGHT RECORDER
AIRSPEED WARNING TEST TEST NORMAL
NO 1 NO 2
OFF
BITE
A INDICATOR
FLIGHT RECORDER/MACH AIRSPEED WARNING TEST MODULEFLIGHT DATA RECORDER
AB
Flight Recorder System Component Location
Figure 1
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D. The Sundstrand flight data recorder also has a BITE indicator. The BITE indicator is yellow when the flight data recorder is faulty or power to the unit is off. The BITE indicator is black when the flight data recorder is operating correctly.
E. Flight data recorder functions (Fig. 2)
(1) Sundstrand flight data recorder functions
(a)
The input data is sent to DAU (Data Acquistion Unit), where it is preconditioned, multiplexed, and converted to serial bi-phase digital data format. This data is then sent to Recording System Controlling (RSC) circuitry. In RSC circuitry the serial bi-phase digital data is converted into TTL level digital data which is then sent to microprocessor and manipulated by the software program of the microprocessor and reconverted into serial bi-phase digital data format. The resulting data is inputed into the TI (Transported Interface) circuitry. This circuitry contains input and output ports which enable the CPU (Centeral Processing Unit) of microprocessor to communicate instructions to be executed by the implementing circuitry, and to receive reports on operating conditions from monitoring circuitry. The TI circuitry then sends the data to (RWI) Read/Write Interface circuitry. RWI circuitry performs the function of writing data to or reading (playback) data from tape. RWI circuitry processes the data into write current signals, and sends the signals to WRITE DEMUX/DRIVERS, which are then recorded on tape by the magnetic heads.
(b)
The tape transport is a coplanar, peripheral belt driven device which contains tape, reel drive belt, two reel hubs, capstan/fly wheel, two belt idlers, tape guides and EOT/BOT (end of tape/beginning tape) sensors (Fig. 4). Also, there are two interleaved four-channel erase heads, two interleaved four-channel read/write heads, and the primary drive belt. The primary drive belt passes through a hole in the wall of the transport to connect the drive motor with the capstan/fly wheel. A second hole is used by the wiring for the heads and tape sensors. The two holes are each lined with a feed thru, which become swollen and plug the holes in the event of fire.
(c)
The stepper drive motor, mounted outside of the crash-proof container, operates in a semi-slewing mode to drive the capstan/flywheel. The capstan/flywheel then drives a belt which passes over the two wheel hubs and the belt idlers. The EOT/BOT sensor switches the drive motor direction and switches tape tracks at each end of the tape. The read/write heads and the erase heads produce eight sequential tracks of recording. Tape speed is 6 inches per second with the stepper motor running either continuously or incrementally which gives a net tape speed of 0.48 inches per second.
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A 737-300/400/500MAINTENANCE MANUAL
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