PPRuNe Forums - ADIRS Operations ( Alignment )

PPRuNe Forums (https://www.pprune.org/)

- Tech Log (https://www.pprune.org/tech-log-15/)

- - ADIRS Operations ( Alignment ) (https://www.pprune.org/tech-log/417348-adirs-operations-alignment.html)

Neupielot

6th Jun 2010 14:47

ADIRS Operations ( Alignment )

Fcom 3.4.34-ADIRS

Quote:

Avoid alignment during an engine start, or while the engines are running.

Need a bit of help here plz.

If the aircraft is stationary ( not blocking any traffic eg. still at the remote stand ) and the engines started. Any potential problem with re-alignment ?

I know, u must be thinking , why realign after u start? Cos sometimes the computers do crazy things and I'm thinking a IRS realignment might help. But after reading the Fcom- i'm not sure if we can do that......

Many thanks.

LME (GOD)

6th Jun 2010 17:39

If ATC will let you block a taxiway for 10 minutes then fill your boots!! Probably not recommended due to the slight movement you get with the engines running.

Neupielot

6th Jun 2010 22:04

Thanks.

But as for

Quote:

If ATC will let you block a taxiway for 10 minutes then fill your boots

I know its highly unlikely but like i said

Quote:

eg. still at the remote stand

Some airfields have Remote parking that doesn't need push back eg. ZSPD ( shanghai ). So u won't be blocking anyone at all actually.

But thanks once again. :ok:

Bullethead

7th Jun 2010 01:30

I don't think the motion you get from having engines running is any worse than you get from sitting in strong gusty conditions or having passengers boarding and performing an alignment with engines off.

I have aligned IRSs countless times in gusty conditions witout any problem.

Regards,
BH.

Slasher

7th Jun 2010 02:38

Isnt an ADIRU input needed by the BMC to compute relative pressure like whats needed for engine start?

All times are GMT. The time now is 02:15.