Air Data Inertial Reference Units.
Provides the following information to the instruments, engines, B737 Flight Controls, FMC, and all other systems requiring inertial and air data.:
- Position
- Speed
- Altitude
- Attitude
The system includes two IRUs (Left and Right) which contain internal gyros and accelerometers for position information.
Other components of the ADIRS include:
Two main pitot tubes and four static ports provide pressure information for for speed and altitude. Two Alpha Vanes provide AoA information, and a Total Air Temperature probe provides air temperature to the ADIRS system.
This information is sent to the flight displays by two DEUs.