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Clock date
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AIMS UTC
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AIMS date
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777 AIRCRAFT MAINTENANCE MANUAL
CLOCKS -FUNCTIONAL DESCRIPTION
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FLIGHT DATA RECORDER SYSTEM -INTRODUCTION
Purpose
The flight data recorder system (FDRS) stores airplane parameters and system data in a protected solid state memory. These parameters provide data on flight conditions and airplane systems operation. Airline personnel use the data to analyze system performance during airplane maintenance.
Glossary
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ac -alternating current
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ACE -actuator control electronics
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AIMS -airplane information management system
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AOA -angle of attack
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ARINC -aeronautical radio, inc.
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ATE -automatic test equipment
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CMCF -central maintenance computing function
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CMM -communication management module
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comm -communication
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CPM -core processor module
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ctrl -control
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dc -direct current
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DFDAF -digital flight data acquisition function
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EEC -electronic engine control
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EICAS -engine indication and crew alerting system
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ELM -electrical load management
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FDR -flight data recorder
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FDRS -flight data recorder system
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flt -flight
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gnd -ground
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HF -high frequency
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IOM -input/output module
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L -left
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LAN -local area network
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lat -latitude
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long -longitude
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LRU -line replaceable unit
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maint -maintenance
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MAT -maintenance access terminal
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nav -navigation
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PDF -primary display function
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PMA -permanent magnet alternator
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pwr -power
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R -right
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rec -recorder
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rly -relay
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RPM -revolutions per minute
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rtn -return
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TAT -total air temperature
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ULD -underwater locating device
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V -volt
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VHF -very high frequency
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wps -words per second
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xdcr -transducer
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xfr -transfer
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xmtr -transmitter
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FLIGHT DATA RECORDER SYSTEM -INTRODUCTION
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FDRS -GENERAL DESCRIPTION
General
The flight data recorder (FDR) receives and stores selected airplane parameters from various airplane systems and sensors in a crash-protected solid state memory. The digital flight data acquisition function (DFDAF) of the airplane information management system (AIMS) receives all the flight recorder data. The DFDAF then processes the data and sends it to the FDR, where it is stored. The DFDAF is in the CPM/Comm module of both AIMS cabinets.
The flight data recorder system (FDRS) operates during any engine start, while any engine is running, during test or when the airplane is in the air.
The FDR records the most recent 25 hours of flight.
In addition to the data recording function, the FDR also has monitor circuits which send fault data to the DFDAF within AIMS.
DFDAF
The DFDAF receives all flight parameters to record. The DFDAF converts these parameters to a digital format and sends them to the FDR.
Analog Signals and Analog Discretes
The DFDAF processes and the FDR stores analog signals and analog discretes.
The FDR sends discrete signals to the DFDAF. The discretes show fault status.
Data Bus Interfaces
AIMS gets power control data from several airplane systems. Power goes to the FDR when the logic is valid. The power control data includes:
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Engine start
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Engine running
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Air/ground logic
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Test.
The FDR gets airplane parameters from the DFDAF in AIMS. Data goes on ARINC 717 buses. Each ARINC 717 bus has a shielded twisted pair of wires.
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