The A320 normally lands with flaps full, flap 3 is generally for abnormal procedures (like an engine out).
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The A320 normally lands with flaps full, flap 3 is generally for abnormal procedures (like an engine out). I generally want some flap out (usually flap 1) as I start descending on final since the drag keeps the speed under control.
Touching down with full flaps gives you the lowest stalling speed. It also gives you an additional benefit: maximum drag so you will decelerate as rapidly as possible with the power off, getting you down through that red zone of poor control, rapidly.
Most airlines IRL use Flaps 30 as the standard. It would go something like (1/5/15/25/30) 40 is used when there are higher wind conditions of the sort to try and stablize the aircraft on approach.
The A320 and A321 have the same wingspan (35.8m), but the A321 has a higher wing area, and consequently a lower aspect ratio (10 compared to the A320's 10.3). Another physical difference that can be noted is that the A321 has double slotted flaps versus the single slotted flaps on other A320 family aircraft.
So a Flap 3 landing would be a landing with the flap handle in the Flaps 3 position, one short of full extension. Why would a pilot want to do that? The ideal landing speed would be a little higher than with full flaps, which might be advisable if the winds are gusty and the runway length is not a constraining factor.
When it comes to the original crop of the Airbus A320 family, these twinjets have a service ceiling of between 39,100 ft and 41,000 ft. This is between 11,917 m and 12,497 m.
Most of the time, landing flap will be determined by the landing performance required, flap 30 is nearly always desirable unless we need the lower approach speed, or if increased forward visibility is required such as during low vis ops. Performance is the determining factor.