General

Question 1

The Air Data and Inertial Reference System (ADIRS) supplies temperature, anemometric, barometric and inertial parameters to the:

Answer 1

EFIS system (PFD and ND) and to other user systems (FMGC, FADEC, ELAC, SEC, FAC, FWC, SFCC, ATC, GPWS, CFDIU, CPC).

Question 2

The system includes:

Answer 2

‐ Three identical ADIRUs (Air Data and Inertial Reference Units).
-One ADIRS control panel on the overhead panel for selection of modes (NAV, ATT, OFF) and indications of failures.
‐ Four types of sensors
‐ Eight ADMs (Air Data Modules) which convert pneumatic data from PITOT and STAT probes into numerical data for the ADIRUs.
‐ A switching facility for selecting ADR3 or IR3 for instrument displays in case of ADIRU1 or 2 failure.

Question 3

Each ADIRU is divided in two parts, either of which can work separately in case of failure in the other:

Answer 3

• The ADR part (Air Data Reference) which supplies barometric altitude, airspeed, Mach, angle of attack, temperature and overspeed warnings.
• The IR part (Inertial Reference) which supplies attitude, flight path vector, track, heading, accelerations, angular rates, ground speed and aircraft position.

Question 4

Four types of sensors:

Answer 4

• Pitot probes (3)
• Static pressure probes (STAT) (6)
• Angle of attack sensors (AOA) (3)
• Total air temperature probes (TAT) (2)

These sensors are electrically heated to prevent from icing up.

Question 5

ADIRU (1) is supplied by

Answer 5

CAPT probes

Question 6

ADIRU (2) is supplied by

Answer 6

F/O probes

Question 7

ADIRU (3) is supplied by

Answer 7

STBY probes and CAPT TAT.