ADIRS Panel

Question 1

Explain the 3 positions of the rotary selector (Off, Nav, ATT)

Answer 1

1. Off - ADIRU 1(2)(3) is not energized
2. NAV - IR 1(2)(3) operates in NAV mode, the normal position, energized, full inertial data is provided to the systems. ADR is also active.
3. ATT -
   A. IR 1(2)(3) only provides altitude and heading entered by the flight crew
   B. The navigation data has to be reset every 10 mins
   C. Heading must be entered via MCDU.
   D. ADRs still operational and may be switched off by pushing the ADR button if needed

Question 2

On the IR button, a steady Align light means.

Answer 2

Normal operation in align sequence mode

Question 3

If all lights are off on the ADR pushbutton switch, it means?

Answer 3

ADR 1(2)(3) is on

Question 4

What do the OFF and FAULT lights represent on the ADR pushbuttons?

Answer 4

Off means the ADR was manually switched off and Fault when that ADR has failed

Question 5

Can you push in the black IR button? How do you affect the IR?

Answer 5

No. It only displays Fault or Align. To affect the IR, move the rotary switch. This will also affect the ADR.

Question 6

How do you shut down the ADR (1)(2)(3) without shutting down the IR (1)(2)(3)?

Answer 6

Push the black ADR button on the Overhead panel

Question 7

What do these positions on the Data Selector Knob mean and used for?

1. Wind
2. PPOS
3. HDG
4. STS
5. TK/GS
6. TEST

Answer 7

1. Wind - true wind direction and wind speed
2. Present Position
3. Heading - true heading, Shows TTN, Time To Nav, 10 mins
4. Status - shows IRU status or abnormal situation with guidance ex. STS - ENTER PPOS is displayed on the main display display
5. Track and Ground Speed. Uses true track and ground speed of the aircraft
6. Test - spring loaded, tests the lights on the keyboard and produces a test pattern on the main display

Question 8

How long does a fast and full alignment take?

Answer 8

Fast: 30 seconds
Full: 10 minutes

Question 9

What does the On light from the ON Battery mean? What does it mean if it is lights out?

Answer 9

Off
Lights out, all the ADIRU’s are either off or on and not supplied by the batteries

On

1. Batteries are supplying at least on ADIRU
2. Also comes on for a few seconds during a full alignment but not during a fast alignement

Question 10

When on the ground and one ADIRU is supplied by the batteries and ON BAT is lit, what happens?

Answer 10

1. An external horn sounds

2. The ADIRU and AVNCS light come on amber on the external power panel

Question 11

A flashing Align in white on an IR switch means?

Answer 11

1. No position entered after 10 mins

2. Difference between shutdown position and entered position exceeds 1 degree of longitude or latitude