ADIRS Flashcards
When is a full alignment required?
- First flight of the day
- Previous flight had limited position updating
- If any IRS drift error is 5 NM or greater
- When required per Company pages
When is a fast alignment acceptable?
-When turn around time is less than 4 hours
How is a quick align performed?
Turn each IR selector off and back on (must occur within 5 seconds for each IR)
Align on REF
When you turn the mode selector to NAV, what are you looking for on the panel?
The ALIGN light illuminates steady
What does the ON BAT light indicate?
- one or more IR is supplied by the aircraft battery
- also illuminates briefly during the beginning of a full alignment
What does a flashing white align light mean?
- IR alignment fault (aircraft moved during alignment)
- no present position entered within 10 mins of NAV selection
- difference of 1° LAT/LONG between shutdown and entered position
What does steady illumination of the amber IRU FAULT light indicate?
A fault affects the respective IR, IR is lost
What does a flashing illumination of the amber IRU FAULT light indicate?
Attitude and Heading may be recovered in ATT mode (navigation portion is lost)
What does the amber ADR FAULT light indicate?
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?
Yes
With the loss of ADR 1, what would be lost on the Captain’s PFD?
Airspeed and Altitude (outside info)
What would restore the lost altitude and airspeed information?
Selecting CAPT 3 on the EIS SWITCHING panel AIR DATA Selector
What would be missing on the Captain’s PFD if IR 1 failed or was turned off?
Attitude and navigation information (inside info)
What action would recover the attitude and navigation information?
Selecting CAPT 3 on the EIS SWITCHING panel ATT/HDG selector
