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control rod connects the transmitter to the elevator.
FDRS - ELEVATOR POSITION TRANSMITTER
EFFECTIVITY
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FDRS - ELEVATOR POSITION TRANSMITTER
FDRS - ELEVATOR POSITION TRANSMITTER
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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General
The flight data recorder (FDR) receives and keeps the last 25
hours of flight data. The FDR receives the data from the flight
data acquisition unit (FDAU). The data is in a crash-proof, fireresistant
container. The FDR does a self test at power-up to
make sure the recorder is good. It also has a continuous test to
find any faults.
Recording Data
The FDR receives data from the FDAU in Harvard bi-phase
format. The input/output interface buffer puts data on the data
bus. It also sends the received data back to the FDAU.
The central processor unit (CPU) controls the data movement. It
also does self-tests and sends the test results to the BITE
monitor.
BITE
The BITE monitor does a check of the power supply and the
FDR functions. The BITE monitor controls two relays. The relays
give these fault indications:
* System status flag
* Maintenance flag
* BITE light.
These conditions cause a system status flag fault output:
* Loss of input power
* Loss of input data
* Catastrophic central processor unit failure
* Not enough memory because of defective memory devices
* Faults found in the software
* Bad data rate inputs
* Data not properly recorded
* Test mode.
These conditions cause a maintenance flag fault indication:
* Hardware faults
* Faults found in the software
* Bad data rate inputs.
The status output goes to the flight recorder test module. This
output is a ground and turns on the OFF light on the test module
if the internal record function is bad. The output is 28v dc when
recorder operation is correct.
The maintenance flag output goes to the FDAU. This output is an
open with a recorder fault . The output is a ground when
recorder operation is correct.
Failures or malfunctions are stored in memory. Ground support
equipment can read the memory.
FDRS - FDR FUNCTIONAL DESCRIPTION
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
31-31-00-030
FDRS - FDR FUNCTIONAL DESCRIPTION
FDRS - FDR FUNCTIONAL DESCRIPTION
EFFECTIVITY
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FDRS - FDR FUNCTIONAL DESCRIPTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The flight data acquisition unit (FDAU) gets aircraft data from
digital, discrete and analog sources. The FDAU uses this data to
make serial digital data for the flight data recorder (FDR).
The FDAU also collects data for the airplane condition
monitoring system (ACMS). The FDAU stores the ACMS data.
You can move this data to a disk at the data loader control
panel.
Power Requirements
The FDAU gets 115v ac, 400 Hz, single phase power from the
P18 panel through the system test plug. An internal power
supply makes all the necessary dc voltages. The FDAU also
gets 26v ac reference voltage for the analog transmitters and
sensors.
The FDAU sends 28v dc to the flight recorder accelerometer.
Analog Inputs
Analog input signals are processed in this sequence:
* Analog interface circuits receive analog signals
* Analog to digital (A/D) converters change analog signals to
digital data
* The master controller receives the digital data.
The master controller does continuous self test and calibration.
Discrete Inputs
Discrete input signals are processed in this sequence:
* Discrete interface circuits receive discrete signals
* A multiplexer samples each input
* The master controller receives the discrete data.
Digital Inputs
　
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