ADIRS panel

Question 1

What is ADIRS?

Answer 1

Air Data and Inertia Reference System

Question 2

What are some of the parameters that the Air Data Reference System provides?

Answer 2

Barometric altitude 
Over speed warning
Angle of attack
Temperatures
Speed/Mach

Question 3

What are some of the parameters the IR provides?

Answer 3

Flight path vector
Attitude
Acceleration 
Track
Heading
Angular rates
Groundspeed and aircraft position

Question 4

If there was an IR1/ADR1 FAULT,what should be done with the switching panel to display backup data appropriately?

Answer 4

ATT/HDG to CAPT 3

Question 5

Explain the ADIRS Power-up and Initialization.

Answer 5

• switch from OFF to NAV
• ON BAT light illuminates for the duration of alignment (only on A319 502-534)
• In A319 535,536, A320s, A321s, the E/WD memo section displays “IRS IN ALIGN” during alignment and replaces the ALIGN lights on the overhead panel.

Question 6

What is the important of observing the ON BAT light?

Answer 6

It confirms the ADIRS ability to revert to aircraft battery power.

Question 7

What are some indications of an ADIR having reverted to battery power on the ground

Answer 7

• An external horn sounds

- An ADIRU and AVNCS light illuminates in blue on the external power panel.

Question 8

What is the significance of a steady FAULT light on the IR?

Answer 8

IR has failed and cannot be recovered

Question 9

What is the significance of a flashing FAULT light on the IR?

Answer 9

Navigation function is lost. Attitude and Heading may be recovered in ATT mode.

Question 10

What could cause the flashing white ALIGN light to illuminate on the ground

Answer 10

• PPOS not enter within 10 minutes of alignment or within 3 minutes of last alignment.
• Large difference in LAT/LONG between shutdown position and entered position
• Aircraft movement during alignment
• No align light on A320-The E/WD memo section displays “IRS IN ALIGN” during alignment and replaces ALIGN lights on the overhead panel. This memo flashes in green for the same reasons as the ALIGN lights flash on other aircraft.

Question 11

Describe what would happen if an ADR was selected OFF?

Answer 11

• The pilots would lose barometric altitude, airspeed, Mach, angle of attack, temp, and over speed warnings from that one ADR.
• The ECAM would instruct the pilot to select the AIR DATA SWTG to CAPT 3 or FO 3 as appropriate.
• At that point the affected pilot’s side would return to normal

Question 12

What functions are lost when an IR is turned OFF?

Answer 12

• There are two ADIRS control panels installed on the fleet. On the older panel with a keypad and digital, the pilot would lose the IR part ( Inertial Reference) which supplies attitude, flight path vector, track, heading, accelerations, angular rates, ground speed, and aircraft position, along with all the ADR information. The ECAM instructs the pilot to slect the ATT HDG SWTG to CAPT 3 or FO 3 as appropriate. At that point the affected pilot’s side to normal.
• The newer panel with no panel and digital display allows the pilot to turn off only the IR, and in this case, only the IR information would be lost and the ADR information would still be available.

Question 13

If the AIR DATA portion of the #1 ADIRU failed, what should be done with the switching panel to display backup data appropriately?

Answer 13

Air data to Capt 3