*
No data input to the FDR

*
A power control relay failure in the power management panel.

The DFDAF reports system status to the CMCF within the AIMS cabinet.
CMCF
The DFDAF receives fault and status information from the FDR. DFDAF sends fault reports and status data to the CMCF. The CMCF determines pass/fail. For each fault message sent to the CMCF, the DFDAF records this information:
*
Which message was sent

*
The specified data

*
Diagnostic data

*
Date, time, and flight number

*
Software part number.

Use the MAT to request the DFDAF to start the FDRS ground test. The MAT interfaces with the CMCF which sends the test command to the DFDAF. The DFDAF transmits two frames of data to the FDR to verify the operational status of the FDRS and responds back to the CMCF with a pass/fail message. You see the test results and fault status on the MAT and the EICAS display format.
The DFDAF in the right AIMS cabinet sends data to the FDR first during the ground test. After the ground test for the DFDAF in the right AIMS cabinet, the DFDAF in the left AIMS cabinet sends data to the FDR to do the second half of the ground test.
A manual POWER ON command causes the FDR to transfer data to an ARINC 615 portable data loader. A manual POWER OFF command is available from the MAT to remove power to the FDR. The FDRS normal mode of operation inhibits the manual commands.
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FDRS -DFDAF FUNCTIONAL DESCRIPTION

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FDRS -FDR FUNCTIONAL DESCRIPTION

General
The flight data recorder (FDR) receives and records the last 25 hours of data. The FDR receives the data from the DFDAF. The FDR records the data in a solid-state memory. The memory is in a crash-proof, fire-resistant container. The FDR also monitors and sends fault data to the DFDAF.
Recording Data
The AIMS digital flight data acquisition function (DFDAF) sends data on a high speed data bus (ARINC 717) to the FDR. In the FDR, the receiver processes and sends the data to the microprocessor. The microprocessor receives, processes and stores the data in a crash survival solid-state memory.
Data Downloading
The front mounted automatic test equipment (ATE) connector on the FDR provides a connection for:
*
ATE or ramp test equipment for recorder checkouts on or off the aircraft

*
Data download to a portable data unit while on or off the airplane.

Non-normal Conditions
The FDR microprocessor sends these two discretes to the AIMS DFDAF:
* System status flag * Maintenance flag.
The system status flag discrete causes a system level alert. A maintenance flag discrete causes a FDR internal failure. When a FDR fails, the FDR sends both discretes. When the AIMS DFDAF receives either discrete, EICAS (PDF) shows a FLT RCDR SYS status message. The AIMS DFDAF also sends the fault data to the AIMS CMCF.
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FDRS -FDR FUNCTIONAL DESCRIPTION

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FDRS -SYSTEM TESTS

General
You can do the FDRS system test to verify correct system interfaces and internal operation of the FDR. You do the test from the MAT.
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FDRS -SYSTEM TESTS

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FDRS -SPECIAL FUNCTIONS

General
These are the special functions for the flight data recorder system:
*
Flight Data Recorder Power Off

*
Flight Data Recorder Power On.

Flight Data Recorder Power Off
A manual POWER OFF command is available from the MAT to remove power to the FDR. The FDRS normal mode of operation inhibits the manual commands.
Flight Data Recorder Power On
A manual POWER ON command causes the FDR to transfer data to an ARINC 615 portable data loader.
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FDRS -SPECIAL FUNCTIONS

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