You'll feel it in your bum and see it out the window, if you feel that you need thrust in the flare then do it.
Remember that in a Jet Pitch controls Sink rate and thrust controls Speed.
So, if the A/C is sinking too much at say 100' you will need to pull back to arrest the sink and THEN add thrust to stop the speed decay. If it's big enough you will need to keep the thrust on all the way to touchdown and then close the thrust.
One problem, not adding thrust will require the pitch attitude to be higher than normal to arrest the sink thus a tail strike is possible in extreme situations. Watch out. Sometimes in extreme undershoot shears it could require a lot of thrust to arrest the sink, in that case I'd strongly suggest a missed approach be conducted even if you touch down.
In a A/THR approach the A/THR will obviously add the thrust for you, all be it a little slowly for some!! ( another story )
On a normal stabilized landing in the A330 you'll need to close the thrust levers as you commence the flare otherwise it won't land!!
Last edited by nitpicker330; 24th Mar 2014 at 07:05.