ADIRS – Air Data Inertial Reference System

[Ref Youtube]

The above two video clip are also describing the Air Data Inertial Reference System (ADIRS – pronounced “Ada-s”), of which major purpose are to feed 1) air data and 2) inertial information for various flight management computers and components (e.g Engine). Also, it provide information to flight crews on flight displays.

Composition of ADIRS – Airbus

  1. Pitot-Static system
  2. Air Data Module (ADM)
  3. AoA sensor
  4. TAT probe  (TAT pronounced “Tech”)
  5. Air Data Inertial Reference Unit (ADIRU – pronounced “Ada-ru“) – receive data from probes, sensors and transducers

Notes: ADR and IR are operating independently 

ADIRU have 2 parts – two distinct partitions with independent processors – for Air Data function and Inertial Reference computing.

Air Data Reference function –

  1. Airspeed
  2. Mach
  3. AoA
  4. Air temperature and
  5. Barometric Altitude and

Inertial Reference computing –

  1. Attitude
  2. Heading
  3. Ground speed
  4. Position
  5. Acceleration

INS/IRS – Inertia Navigation System / Inertia Reference System

Composition of ADIRS – Boeing

  1. Pitot-Static system
  2. Air Data Module (ADM)
  3. AoA sensor
  4. TAT probe  (TAT pronounced “Tech”)
  5. Air Data Module (ADM)
  6. Air Data Inertial Reference Unit (ADIRU)
  7. Secondary Attitude Air Data Reference Unit (SAARU pronounced “沙-Ru”) – source fed from standby pitot-static probes

Basically, different aircraft manufacturer as well as original equipment manufacturer (OEM) might have slightly difference about the name of components, but the overall operating principle are vary similar.

 

 

 

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