Air data module

Illustration of the airspeed indication and detection system on fly-by-wire aircraft

An air data module is a component of the navigation system.[1] Each unit converts pneumatic (air pressure) information from a Pitot tube or a static port into numerical information which is sent on a data bus.[2] This pressure information is received and processed by the Air Data Reference (ADR) component of the Air Data Inertial Reference Unit (ADIRU).[1] This processed information is then sent to a display management computer(s) that present information on the cockpit's primary flight display.[3] Airspeed information is also sent to the flight computers and other electronics.[4] Airspeed information is also sent to the autoflight subsystem (.e.g. flight management and guidance system).[5]

Construction

The air data module is a gas pressure sensor which converts mechanical forces created by gas pressure into digital signals that can be carried to the air data reference unit. ADM generally have a maintenance bus and communication bus, and a connector on the housing for a pressurized gas line that is connected to the Pitot tube or static ports. The maintenance bus can be EIA-485 and the communication bus can be ARINC 429[2][6]

References

  1. 1 2 "SmartCockpit - Airline training guides, Aviation, Operations, Safety". Archived from the original on 2007-01-15.
  2. 1 2 "Erroneous flight instruments". Boeing Aero Magazine, Issue 08. Archived from the original on 12 June 2008. Retrieved 2008-07-14.
  3. ↑ "SmartCockpit - - A330 - Systems - Indicating and Recording". Archived from the original on 2007-01-15.
  4. ↑ "SmartCockpit - - A330 - Control systems". Archived from the original on 2009-06-12.
  5. ↑ "SmartCockpit -A330 - Autoflight systems". Archived from the original on 2007-01-15.
  6. ↑ "www51.honeywell.com" (PDF).


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