FLIGHT RECORDER/MACH AIRSPEED
A2
WARNING TEST MODULE
1
BEJ 113-999 2
B
Flight Data Recorder System Component Location Figure 1 (Sheet 1)
BEJ 101-112
F13361
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A 737-300/400/500MAINTENANCE MANUAL
HOLD DOWN HOOK (EXAMPLE)
FLIGHT DATA ACQUISITION UNIT C
Flight Data Recorder System - Component Location
Figure 1 (Sheet 2)
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A98104
A 737-300/400/500MAINTENANCE MANUAL
Flight Data Recorder System - Block Diagram
Figure 2
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A 737-300/400/500MAINTENANCE MANUAL
ANALOG
SIGNALS
DISCRETE
SIGNALS
DIGITAL
SIGNALS
115VAC
STATUS
RELAY
RECORDER
Flight Data Acquisition Unit Internal - Schematic
Figure 3
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A
737-300/400/500MAINTENANCE MANUAL
B. The FDAU supplies 28 volts DC to the accelerometer.
C. Teledyne FDAU
(1) The front panel of the FDAU has a READ switch, an ATE connector, fault lights and a fault STATUS display.
(a)
The READ switch is used to provide a confidence test of the FDAU.
(b)
The ATE connector allows connection to external test equipment.
(c)
The STATUS display shows FDAU fault codes.
(d)
The fault lights provide indication of the status of the system. 1) The FDAU FAIL light comes on if the internal FDAU tests
fail.
2) The DFDR FAIL light comes on if the MAINTENANCE FLAG line from the DFDR indicates a failed DFDR. The DFDR FAIL light also comes on if the flight recorder system is energized (FLIGHT RECORDER AC and FLIGHT RECORDER DC circuit breakers are closed) and the DFDR is not in operation (airplane on ground, both engines off, flight recorder TEST/NORMAL switch is in the NORMAL position).
3) The CAUTION light comes on if the internal checks of the non-mandatory part of the FDAU fail. The CAUTION light also comes on if the playback data is not present or not correct. The playback data will not be present if the FDR is not in operation.
3. Flight Data Recorder (FDR) (Fig. 3A)__________________________
A. The FDR is installed above the ceiling panels at STA 947, WL 290, LBL 10.
B. BEJ 113-999;
Flight Data Recorder Description (Solid State Recorder)
(1) The flight data recorder writes the data for the last 25 hours of airplane operation. The data is stored in solid-state memory. The solid-state memory is in a crash-proof container in the flight data recorder.
C. BEJ 101-112;
Flight Data Recorder Description (Magnetic Tape Recorder)
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