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The digital interface receives and processes ARINC 429 digital
signals. The FDAU master controller checks parity and status
bits before sending the data to the FDR.
When the FDAU gets power, a software routine does a check of
all digital input channels. If the test fails, the DFDAU fault light
comes on and the BITE out discrete to the status relay changes
to an open.
Master Controller Signal Processing
The master controller contains the mandatory interface.
The master controller receives the flight data, puts it in a
sequence, and sends it in serial mode to the ARINC 573/717
interface.
ARINC 573/717 Interface
This interface formats digital data to harvard biphase code. The
interface sends this code to the flight data recorder.
FDRS - FDAU FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Data Management Unit (DMU) Master Controller Processing
The DMU master controller processes ACMS data. The DMU
monitors FDAU inputs for specified ACMS parameters. When
the DMU master controller sees the data change to a value to
record, the ACMS makes a report of the parameters. Also, at
various times during flight, the ACMS stores reports. The ACMS
memory keeps the reports.
The DMU master controller contains the ACMS interface. The
controller sends reports to the data loader control panel and the
PCMCIA recorder. The airline can use a data loader or PCMCIA
card to store the reports. The controller can get ACMS software
from the data loader control panel.
The DMU master controller gets data from the FDAU master
controller on an internal data bus.
Solid State Memory
Solid state memory holds the data until you want to download
reports.
Personal Computer Memory Card International Association
(PCMCIA) Memory
A PCMCIA card slot gives access to PCMCIA memory cards.
ACMS Data is kept on a memory card. You can configure
PCMCIA cards as an internal quick access recorder. The
memory card can record all mandatory parameters. Memory
card removal or installation is possible from the front of the
FDAU.
Built In Test Equipment (BITE)
Select the BITE switch to ACMS or DFDAU to see software and
data base part numbers and any active fault codes.
These lights come on with a fault:
* ACMS - ACMS fault
* DFDR - FDR fault
* DFDAU - FDAU fault.
The FDAU fail signal (an open) goes to the status relay with a
FDAU fault.
FDRS - FDAU FUNCTIONAL DESCRIPTION
EFFECTIVITY
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31-31-00-029
FDRS - FDAU FUNCTIONAL DESCRIPTION
FDRS - FDAU FUNCTIONAL DESCRIPTION
EFFECTIVITY
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General
The FDAU and FDR do continuous self-tests. These tests are
active when an engine is in operation or the airplane is in the
air. For flight recorder system faults, the flight recorder light
comes on.
You can give power to the flight recorder on the ground with the
engines not in operation. To turn on the flight recorder, set the
flight recorder/mach airspeed warning test module TEST/
NORMAL switch to the TEST position.
FDAU Faults
If the FDAU has a fault with the process of data for the flight
recorder, these lights come on:
* DFDAU light on the front of the FDAU
* Flight recorder OFF light on the flight recorder/mach
airspeed warning test module
* Both master caution lights
* OVERHEAD caution annunciator.
If the FDAU has a fault with the process of data for the aircraft
conditioning monitoring system (ACMS), the ACMS light comes
on.
FDR Faults
Faults in the FDR cause these lights to come on:
* BITE light on the FDR
* Flight recorder fail light on the FDAU
* Flight recorder OFF light on the flight recorder/mach
airspeed warning test module
* Both master caution lights
* The OVERHEAD caution annunciator.
FDRS - SYSTEM TESTS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
31-31-00-031
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