ADIRS Panel Flashcards
When is a full alignment required?
o First flight of the day
o Crew change
o GPS unavailable – FMGC position on previous flight updated with
radio aids.
When is a quick alignment acceptable?
o When aircraft is in transit (full alignment not required).
o When deviation of the IRS position from the FMGC position is at or
above 5nm.
How is a quick align performed?
o Turn each IR selector off and back on (must occur within 5 seconds for each IR).
o Align on REF
When you turn the mode Selectors to NAV, what are you looking for on
the panel?
The ALIGN light illuminates steady.
What does the ON BAT light indicate?
o 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.
What does a steady white ALIGN light indicate?
The respective IR is in the Align mode.
What does it mean when the IR lights are extinguished?
o Alignment has been completed.
What does a flashing white align light mean?
o IR alignment fault (aircraft moved during alignment).
o No present position entered within 10 minutes of NAV selection.
o Difference of 1° LAT/LONG between shutdown and entered position
What does steady illumination of the amber IRU FAULT light indicate?
o A fault affects the respective IR.
What does flashing illumination of the amber IRU FAULT light indicate?
o Attitude and Heading may be recovered in ATT mode (you have lost
the navigation portion).
What does the amber ADR FAULT light indicate?
o A fault is detected in the Air Data Reference part.
Does turning the IR to OFF also turn off the ADR?
Yes
Can you turn the ADR OFF and still have the IR?
o Yes
With the loss of ADR 1, what would be lost on the Captains PFD?
o Airspeed and Altitude information (outside info)
What would restore the lost altitude and airspeed information?
o Selecting CAPT 3 on the EIS Switching Panel AIR DATA Selector.
