Airbus ADIRS Goundspeed.
 

Does the IRS groundspeed automatically reset to zero after engine shutdown? I seem to recall that this will happen after 2 minutes.

Re: Airbus ADIRS Goundspeed.
 

Almost correct. It's not depending on engine shutdown, but on aircraft stop - valid for A319/321 and the newer builds of the A320:

The GS check must be performed 2 min following airplane stop. After this delay the ADIRS automatically resets the GS.

Re: Airbus ADIRS Goundspeed.
 

Many thanks. I take it that the application of the park brake initiates this?

Re: Airbus ADIRS Goundspeed.
 

Didn't think that reply through before posting. However the only ref I can find is in FCOM Vol 3--SOPs. The ground speed check must be performed within two minutes following engine stop. (G/S reset to zero after 2 minutes)

Re: Airbus ADIRS Goundspeed.
 

Carefull guys

This is only the case if the aircraft is fitted with Litton ADIRU's. Our fleet is all Honeywell....and they don't reset.

DTG

Down Three Greens is totally correct.

I didn't think my reply through either and was not specific enough. It's the Litton ADIRS that resets after 2 mins (fitted on all our A319/321 and newer A320), while the Honeywell ADIRS does not reset the GS.