777 AIRCRAFT MAINTENANCE MANUAL
FDRS -GENERAL DESCRIPTION
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Aft Equipment Center
The flight data recorder (FDR) is in the E7 aft equipment rack. Access is through a ceiling panel that is forward of the aft galley.
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Main Equipment Center
The digital flight data acquisition function (DFDAF) is part of the airplane information management system (AIMS). The DFDAF is in the CPM/Comm LRM. The right AIMS cabinet is in the E2-1 shelf. The left AIMS cabinet is in the E3-1 shelf.
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777 AIRCRAFT MAINTENANCE MANUAL
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FDRS -SYSTEM INTERFACE
General
The flight data recorder system (FDRS) gets digital data and digital discrete data on ARINC 629 and ARINC 429 data buses. The FDRS also receives analog inputs from some of the airplane systems and sensors. The FDR receives power from the power management panel. The FDR sends analog data to the digital flight data acquisition functions (DFDAF) of AIMS.
The left AIMS cabinet sends DFDAF data on an ARINC 717 data bus to the FDR. If the left AIMS cabinet DFDAF fails, the right AIMS cabinet sends DFDAF data to the FDR. The DFDAF sends fault data, status and test result data to the CMCF and the display system functions within the AIMS cabinets.
Power
The FDR receives power from the P210 right power management panel. DFDAF uses engine, air/ground, and ground test logic to determine when to turn on the FDR.
Analog Data
The DFDAFs receive status and maintenance flag data from the FDR. The DFDAFs receive key events from the VHF and HF LRUs and variable analog data from TAT, AOA and engine RPM sensors.
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Digital Data
The systems ARINC 629 buses provides engine, airframe data, and air/ground logic. This is the engine data:
*
Engine parameters, normal and exceedances
*
Commands
*
Actual thrust.
This is the airframe data:
*
Flight deck switch position
*
Flight controls positions
*
Mode selections on control panels in the flight deck.
The DFDRS receives status from the engine and airframe sensors. The DFDRS also receives data and status from the electrical power system.
The flight controls ARINC 629 buses provide flight data and navigation data. This is the flight data:
*
Flight control position
*
Commands
*
Status.
This is the navigation data from the ADIRU and SAARU:
*
Pitch, roll and yaw attitude
*
Acceleration data
*
Status.
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FDRS -SYSTEM INTERFACE
ARINC 429 provides navigation (NAV) radio/NAV data and communication (COMM) radio data. This is the NAV radio data:
*
Radio frequencies
*
Mode
*
Parameters
*
Status.
NAV data is aircraft position (LAT/LONG) and sensor status. COMM data is radio control panel frequencies and sensor status.
The left AIMS cabinet sends left or right DFDAF data on an ARINC 717 bus to the FDR.
The DFDAF sends fault data, status data and ground test results to the CMCF.
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FDRS -SYSTEM INTERFACE
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FDRS -FLIGHT DATA RECORDER
Purpose
The flight data recorder (FDR) records flight data in a protected solid-state memory.
Physical Description
The FDR is made of stainless steel. It weighs approximately 18 pounds. The memory storage assembly in the FDR is crush-proof up to 5000 pounds. The FDR case also supplies protection for up to 3400 g’s of impact, deep sea pressures to 20,000 feet, and fire protection up to a temperature of 1100C for 1/2 hour.
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