Controls and Indicators

Question 1

The ADIRS CDU on the overhead panel provides the controls and indicators to permit:

Answer 1

‐ Selection of power supplies to the ADR and IRS systems
‐ Selection and display of navigation data ‐ Status and fault indication of IRS or ADRs.
‐ Manual initialization of IRS

Note: IRS are normally initialized with the FMGC, but IRS may be initialized with the ADIRS CDU as a backup.

Question 2

IR 1(2)(3) Mode rotary sel

OFF :

Answer 2

The ADIRU is not energized. ADR and IR data are not available.

Question 3

IR 1(2)(3) Mode rotary sel

NAV :

Answer 3

Normal mode of operation. Supplies full inertial data to aircraft systems.

Question 4

IR 1(2)(3) Mode rotary sel

ATT :

Answer 4

IR mode supplying only attitude and heading information, if the system loses its ability to navigate. The heading must be entered using:
‐ The CDU keyboard, or
‐ The MCDU (if the entry field is available).

The heading has to be reset frequently (about every 10 min).

Question 5

IR 1(2)(3) lt

FAULT light :

Answer 5

This amber light comes on with an ECAM caution when a fault affects the respective IR.

Steady : The respective IR is lost.

Flashing : The attitude and heading information may be recovered in ATT mode.

Question 6

IR 1(2)(3) lt

ALIGN light :

Answer 6

Steady : The respective IR is operating normally in align mode.

Flashing : IR alignment fault, or no present position entry after 10 min, or difference between position at shutdown and entered position exceeds 1 ° of latitude or longitude.

Extinguished: Alignment has been completed.

Question 7

ON BAT lt

Answer 7

The ON BAT light comes on in amber when the aircraft battery supplies at least one IRS. The ON BAT light also comes on for a few seconds at the beginning of a complete IRS alignment.

Note: When the aircraft is on ground and if at least one ADIRU is supplied by aircraft batteries:
‐ An external horn sounds
‐ The ADIRU and AVNCS light comes on amber on the EXTERNAL POWER panel.

Question 8

DATA selector knob

Answer 8

This knob selects the information to be displayed in the ADIRS display window.

Question 9

DATA selector knob

TEST

Answer 9

The ENT and CLR buttons on the keyboard come on, and the display shows all 8’s.

Question 10

DATA selector knob

TK/GS

Answer 10

The display shows true track and ground speed.

Question 11

DATA selector knob

PPOS

Answer 11

The display shows present latitude and longitude

Question 12

DATA selector knob

WIND

Answer 12

The display shows true wind direction and speed.

Question 13

DATA selector knob

HDG

Answer 13

The display shows true heading and the minutes remaining until alignment is completed.

Question 14

DATA selector knob

STS

Answer 14

The display shows an action code.

Question 15

SYS selector knob

OFF :

Answer 15

The CDU display is not energized.

ADIRS are still energized if the associated IR mode rotary selectors are not at OFF.

Question 16

SYS selector knob

1.2.3 :

Answer 16

System selected for data display.

Question 17

Display

Answer 17

The display presents the data selected by the DATA selector. A keyboard entry overrides the selected display.

Question 18

Keyboard

Answer 18

The flight crew can use the keyboard to enter the present position, or the heading in ATT mode, into the selected system.

Letter keys : Used to enter N, S, E, or W for position, or entering H for heading (ATT mode).

Number keys : Used to enter the present position (or the present magnetic heading in ATT mode).

CLR key : The integral cue light comes on after an entry operation, if the data has an unreasonable value. Pressing this key clears the data display, that has been keyed in but not yet entered.

ENT Key : The integral cue light comes on when a crew member has keyed in a number for N, S, W, E or H . Pressing the key enters data into the ADIRS.

Question 19

ADR 1(2)(3) pb (momentary action)

OFF light

Answer 19

Air data output disconnected.

Question 20

ADR 1(2)(3) pb (momentary action)

FAULT light

Answer 20

This amber light comes on with an ECAM caution, if a fault is detected in the air data reference part.

Question 21

ATT HDG and AIR DATA sel

Pedestal

Answer 21

NORM : ADIRU1 supplies data to PFD1, ND1, DDRMI and VOR/DME.

ADIRU 2 supplies data to PFD 2, and ND2.

CAPT 3 : ADR3 or IR3 replaces ADR1 or IR1. F/O 3 : ADR 3 or IR3 replaces ADR 2 or IR2.

Question 22

IR IN ATT ALIGN-MEMO

Answer 22

This memo appears in green during the IR alignment in Attitude mode.

Question 23

The memo “IRS IN ALIGN X MN” appears during IRS alignment in flight phase 1 or 2. X MN indicates the number of remaining minutes (1 < X < 10), until NAV mode is reached. Before any engine is started:

IRS IN ALIGN X MN

Answer 23

This memo appears in green when at least one active IRS is being aligned.

This memo pulses in green, if the alignment of one IRS is faulty.

Question 24

When one engine is started:

IRS IN ALIGN X MN

Answer 24

This memo appears in amber during IRS alignment. If the alignment of one IRS is faulty, this memo is replaced by the “IR NOT ALIGNED” ECAM caution.