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* FDR status flag signal shows a fault.
Select TEST to connect 115v ac to the FDR. Do this to give power
to the FDR on the ground for maintenance purposes.
When the switch is in the NORMAL position, the FDR gets 115v
ac when the engine running relays or the ground sensing relay
sends a ground to the flight recorder test module. The ground is
sent for either one of these conditions:
* Engine 1 or engine 2 is running. (Engine running is when N2
> 50%)
* Airplane is in the air.
Flight Data Acquisition Unit
The FDAU gets digital, discrete, and analog inputs. The FDAU
changes the inputs to serial digital data. This data goes to the
FDR. The FDAU gets playback data from the FDR and monitors
for the presence of sync words. This senses if the FDR is
operational.
FDRS - POWER, SIGNAL, AND BITE INTERFACE
EFFECTIVITY
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The program switch module sends a code to the FDAU. The
FDAU uses this code to identify the type of airplane.
The FDAU also sends digital outputs to the printer. The printer
sends digital signals to the FDAU to show status.
The FDR sends a maintenance flag signal to the FDAU. A FDR
fault condition causes the flight recorder fail light on the FDAU
to come on.
System Test Plug
The system test plug sends 115v ac to the FDAU. It can also
send 115v ac to some test equipment. You can monitor FDR
signals at the system test plug. The test plug gets two data
inputs. The data that goes to the flight recorder also goes to the
system test plug. If the data to the flight recorder is not all logic
ones and not all logic zeros, the flight recorder sends the data
back to the FDAU. This data is the playback data. The FDAU
also sends the playback data from the flight recorder to the
system test plug.
Flight Data Recorder
The flight data recorder gets the data and keeps it in a solid
state memory.
BITE gives these outputs:
* Status flag - Gives fault signal to the flight recorder test
module to turn on the OFF light
* Maintenance flag - Gives fault signal to the FDAU.
FDRS - POWER, SIGNAL, AND BITE INTERFACE
EFFECTIVITY
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FDRS - POWER, SIGNAL, AND BITE INTERFACE
FDRS - POWER, SIGNAL, AND BITE INTERFACE
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
You can transfer software from a data loader to the FDAU. The
data loader control panel selects where the software goes.
You can also transfer data from the ACMS part of the FDAU to a
data loader.
The FDAU connects to the data loader control panel.
SHZ 009-999
Airborne Data Loader
An airborne data loader connects to the data loader control
panel. You can put a disk in the data loader for data transfer.
SHZ 001-003
Data Loader Plug
A portable data loader connects to the data loader plug. You
can put a disk in the data loader for data transfer.
SHZ ALL
Data Transfer
Two ARINC 429 data buses bring data into the data loader
control panel. These buses are DATA IN 1 and DATA IN 2. DATA
IN 2 sends the ACMS data to the control panel.
The data output port transfers software to the FDAU. This
software goes to the ACMS interface or the mandatory
interface.
The discrete enable signals from the data loader control panel
tell the FDAU whether the software goes to the ACMS interface
or to the mandatory interface.
Data Loader Control Panel Switches
The data load selector switch on the data loader control panel
has three positions. The switch must be in the SINGLE SYS
(single system) position in order for the data loader to send
software to the FDAU.
The system select switch on the data loader control panel has
these FDRS selections:
* NORM - Data loader can get ACMS data
* ACMS - Software goes from the data loader to the ACMS
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