ADIRS Panel

Question 1

What is the ADIRS?

Answer 1

Air Data and Inertial Reference System

Question 2

What type of information does the Air Data Reference System provide?

Answer 2

Barometric altitude, airspeed, overspeed warnings, temperature, angle of attack, Mach

Question 3

What type of information does the IR provide?

Answer 3

Attitude, Flight Path Vector (FPV), track, heading, acceleration, angular rates, groundspeed, and position

Question 4

If there was an IR1 FAULT, what should be done with the switching panel?

Answer 4

ATT/HDG to CAPT 3

Question 5

If there was an ADR1 FAULT, what should be done with the switching panel?

Answer 5

AIR DATA to CAPT 3

Question 6

Explain the ADIRS power-up and initialization.

Answer 6

Switch from OFF to NAV; ON BAT light comes on and then off; E/WD memo shows “IRS IN ALIGN”

Question 7

What are some indications of an ADIR reverting to battery power on the ground?

Answer 7

External horn sounds; ON BAT light comes on; amber ADIRU & AVNCS light on external power panel

Question 8

What does a steady FAULT light on the IR mean?

Answer 8

IR has failed and cannot be recovered

Question 9

What does a flashing FAULT light on the IR mean?

Answer 9

Navigation lost; attitude and heading can be recovered in ATT mode

Question 10

What happens if an ADR is selected OFF?

Answer 10

Loss of altitude, airspeed, Mach, AOA, temp, and overspeed warnings from that ADR; ECAM advises switching to CAPT 3 or F/O 3

Question 11

What happens when an IR is turned OFF?

Answer 11

Loss of IR data only — ADR data remains

Question 12

When should a pilot perform a complete alignment versus a fast alignment?

Answer 12

Complete alignment: first flight, crew change, near equator, poor GPS/NAVAID, or long flight without GPS; fast alignment: if IRS position differs from FMGC by ≥5 NM