ADIRS Panel

Question 1

What does the ON BAT light indicate?

Answer 1

It is illuminated amber if one or more ir(s) is supplied by the aircraft battery. Also illuminates briefly during the beginning of a full alignment

Question 2

How long will each ADIRU stay on battery power?

Answer 2

ADIRS 2 and 3 will remain on battery power for 5 minutes to hold alignment until a generator can be restored. ADIRU 1 (ADIRU 3 if captain selected ATT HDG CAPT 3) will remain on battery power until generator power is restored or battery #2 fails

Question 3

What information is provided by the “IR” units (HAT GAAF)?

Answer 3

H-Heading
A-Attitude
T-Track
G-Ground Track
A-Acceleration 
A-Airplane Position
F-Flight Path Vector

Question 4

What information is provided by the “ADR” units (BOATS)?

Answer 4

B-Barometric Altitude 
O-Overspeed Warnings 
A-AOA
T-Temperatures 
S-Speed/Mach

Question 5

What does a steady white ALIGN light indicate (older panel with keypad)?

Answer 5

The respective IR is in the Align mode

Question 6

What are the indications on the E/WD when an IR is in ALIGN mode?

Answer 6

Before any engine is started (displayed on E/WD):
IR IN ALIGN X MN memo appears in green when at least one active IRS is being aligned
When one engine is started (displayed on E/WD):
IR IN ALIGN X MN memo appears in amber during IRS alignment
IR NOT ALIGNED is displayed as an ECAM Caution Message if the alignment of one IRS is faulty
IR IN ATT ALIGN appears in green during the IR alignment in Attitude Mode

Question 7

What does a flashing white align light mean (older panel with keypad)?

Answer 7

There are three reasons that the white align lights will flash: There is no current position
The position is incorrect
The aircraft moved during alignment

Question 8

How is the crew alerted to the FMGS having no current position, an incorrect position or if the aircraft has moved during the alignment?

Answer 8

IR IN ALIGN X MN memo pulses in green on the E/WD

Question 9

How do you fast align an IR?

Answer 9

Select each ADIRS selector OFF and then back to NAV (one at a time) within 5 sec

Question 10

What does the IR pushbutton do on the newer ADIRS panel?

Answer 10

Inertial data output of the respective IR is disconnected

Question 11

What does steady illumination of the amber IR FAULT light indicate?

Answer 11

A fault affects the respective IR

Question 12

What does flashing illumination of the amber IR FAULT light indicate?

Answer 12

Attitude and heading may be recovered in ATT mode (you have lost the navigation portion)

Question 13

What does the amber ADR FAULT light indicate?

Answer 13

A fault is detected in the Air Data Reference portion

Question 14

Does turning the IR Mode Rotary Switch to OFF also turn off the ADR?

Answer 14

Yes

Question 15

Can you turn the ADR OFF and still have the IR?

Answer 15

Yes

Question 16

When is a full alignment required/quick alignment of the ADIRU required?

Answer 16

A complete alignment must be accomplished in the following cases:
•Before the first flight of the day;
•When there is a crew change;
•When GPS is not available and NAVAID coverage is poor on the expected route;
•When GPS is not available and expected flight time exceeds 3 hours;
•All international and Alaska flights;
•Flight in Class 2 airspace.

On other flights, a fast alignment must be accomplished any time the difference between the IRS position and the FMGC position exceeds 5 NM (see MCDU POSITION MONITOR page).

Question 17

Describe the process for a full alignment of the ADIRU when the temperature is above 35 C and the Flaps Lever is selected to 1.

Answer 17

To perform a complete alignment with Flaps 1 and temp above 35C:
Confirm the aircraft area is clear with ground personnel prior to pressurizing the hydraulic system
Once the area is clear, turn the Y ELEC Pump ON
BLUE ELEC PUMP pb to AUTO
BLUE PUMP OVRD pb to ON
Verify Hydraulic Pressure (on SD page)
Raise the flaps to 0
Turn the Y ELEC Pump OFF
Turn BLUE PUMP OVRD pb OFF
Perform the complete ADIRS alignment
Confirm the aircraft area is clear with ground personnel prior to pressurizing the hydraulic system
Once the area is clear, turn the Y ELEC Pump ON
Return the flaps to 1 if still in hot weather conditions
Turn the Y ELEC Pump OFF

Question 18

What would be missing on the Captain’s PFD and ND if IR1 failed or was turned OFF?

Answer 18

Attitude and navigation information would be lost. ATT and HDG flags will be displayed on the PFD and MAP NOT AVAIL will be on the ND

Question 19

What action would recover the attitude and navigation information if IR1 failed or was turned off?

Answer 19

Selecting CAPT 3 on the EIS switching panel ATT/HDG selector

Question 20

What would restore the lost altitude and airspeed information if ADR1 failed or was turned off?

Answer 20

Selecting CAPT 3 on the EIS Switching Panel AIR DATA Selector

Question 21

Describe a post flight ADIRU accuracy check?

Answer 21

If the drift for any IR is >5nm, refer to the IRS performance chart located in FOM VOL II, Section 3.20.