Flight Data Recorder (FDR)

Flight Data Recorder (FDR) is a device used to record specific aircraft performance parameters. The purpose of an FDR is to collect and record data from a variety of aircraft sensors onto a medium designed to survive an accident. Main purpose of the device is to preserves the recent history of the flight through the recording of dozens of parameters collected several times per Flight Data Recordersecond.

The Flight Data Recorder (FDR) can be a  cockpit mounted unit, which fits into a standard instrument slot in one of the cockpits side panels, or mounted in one of the aircraft bays. Data is stored on standard CF Flash Memory cards capable of recording large amounts of data, limited only by the capacity of commercially available CF Flash. The FDR can record both digital and analog data. The digital data is normally read from one of the busses in the system, such as a 1553 Mux Bus, ARINC-429, RS-232/422/485 or PCM. The recorded data is then stored on rugedized CF Flash Memory Cards. The cards are inserted into two slots on the front panel of the unit, which features a rugged retention and ejection mechanism with a sealed access cover. The use of commercially available CF Cassettes provides an attractive solution for mass data storage, both in its availability, low cost and its ease of use. Such Flash Memories have become very common in numerous applications and are today readily available. The FDR selects specified data words from its interface communication channels and stores them on the internal CF compatible Flash cards. It synchronizes the recorded data from these sources to the time of flight. A setup file provides the FDR with predetermined user setup information. This information defines the selected messages to be recorded and any other user supplied information required for each input source. The FDR uses the setup information to correctly initialize its communication channels and filter out the selected messages from different input sources for recording:

  • MIL-STD 1553 data bus – up to two different busses
  • Serial digital data busses, including RS-232, RS-422, RS-485
  • 4 ARINC 429 channels (16 channels when optional interface card is used)
  • Optional analog interface card, includes 8 Analog inputs + 2 Frequency inputs
  • Two PCM channels
  • One IRIG-B input
  • 8 Discrete signals
  • One 10/100 Base-T Ethernet channel


  • Harsh environments, qualified to Mil-Std-810F
  • Mounted in either cockpit panel (with Dzus) or avionics bay
  • Solid State recording on CF Flash
    Recorded data is user defined
  • Two CF slots
  • Records:
  • Video/Audio
    • Mil-Std-1553
    • RS-422/485
    • ARINC 429
    • PCM
    • Analog
    • Discrete
    • IRIG-B
  • Harsh environments, qualified to Mil-Std-810F
  • Mounted in either cockpit panel (with Dzus) or avionics bay
  • Powered by RTEMS Real Time Operating System
  • Built in Test,
  • Independent Watchdog
  • Communication channel monitoring failure reporting on front panel, Ethernet and on CF

Environmental Conditions:

  • Operating Temperature:     -40C to +70C
  • Storage Temperature:     -40C to +85C
  • Vibration:     Per MIL-STD-810E Method 514.4
  • Shock:     15g, 11msec


  • Mil Std 1553 Mux Bus:     Remote Terminal/Bus Monitor Up to 3 separate dual redundant busses
  • ARINC-429: 4 Receive + 2 Transmit channel
  • RS-485: 3 full duplex channels
  • RS-232/422: 2 full duplex channels
  • Discrete:     16 inputs
  • Ethernet:     10 BT channel (optional)

FDR has many more features including spare slots for expansion, expandable memory, Alphanumeric 8 digit display to show Record state activated, Failure detected, Remaining recording capacity, Panel Mounted with 4 x Dzus, compatible with MS25213.