ADIRS

Question 1

What does ADIRS stand for?

Answer 1

Air Data Inertial Reference System

Question 2

What does the ADIRS system consist of?

Answer 2

A. 3 identical ADIRU (Air Data and Inertial Reference Units)
B. Four types of sensors:
1. 3 Pitot probes
2. 6 Static pressure probes (STAT)
3. 3 Angle of attack sensors (AOA)
4. 2 Total air temperature probes (TAT)
C. All sensors are electrically heated to prevent icing
D. Eight ADM (Air Data Module) convert pnuematic data from the Pitot and STAT into numerical data for the ADIRU
E. ADIRU 3 as back up via the switching panel in case of ADIRU 1 or 2 fault

Question 3

Some examples of the systems supplied by the ADIRS?

Answer 3

EFIS (PFD/ND), FMGC, FADEC, flight controls, FAC, communications (ATC), transponder, etc.

Question 4

What information do the Air Data References (ADR) present to the pilot?

Answer 4

1. Mach
2. Air speed
3. Over speed warnings
4. Temperature
5. Barometric altitude
6. Angle of attack

Question 5

What information do the Inertial References (IR) present to the pilots?

Answer 5

1. Track
2. Heading
3. Flight path vector
4. Aircraft position
5. Attitude
6. Acceleration
7. Ground speed

Question 6

The 3 ways the ADIRS is accessed?

Answer 6

1. MCDU
2. On the Overhead Panel
3. By the switching panel on the Pedestal

Question 7

Which ADIRU supplies the Captain and First Officer’s EFIS and which one is the back up?

Answer 7

ADIRU 1 - Captain’s EFIS
ADIRU 2 - FO EFIS
ADIRU 3 - back up
*Displayed from the EFIS (PFD + ND)