A320 flap 2 VLS increase
Joined: Nov 1999
Aviation Qualifications: ATPL
Posts: 3,150
Likes: 744
From: UK
A321 yesterday. There is definitely no VLS increase when Config 1 and Config 2 go out; it just drops away as you would expect.
On the youtube clip of the raw data approach you posted James, I think the speed brake is out - VLS is right up against the speed bug, so I think this brief few knots increase only occurs if the speed brake is deployed AND when only the slats are moving out.
On the youtube clip of the raw data approach you posted James, I think the speed brake is out - VLS is right up against the speed bug, so I think this brief few knots increase only occurs if the speed brake is deployed AND when only the slats are moving out.
Last edited by Uplinker; 6th February 2017 at 10:01. Reason: spelling
Joined: Jun 2007
Posts: 3,443
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From: Wanderlust
There are a few threads that start on a wrong assumption and members enjoy giving free reign to their imagination. It never ends because nobody can produce an official answer nor anybody is ever sure that it really happens.
Joined: Nov 1999
Aviation Qualifications: ATPL
Posts: 3,150
Likes: 744
From: UK
I hope that wasn't a dig at me vilas?
I have reported what I have seen in actual A320 and A321s when configuring for actual approaches.
I have watched the youtube clip James posted and have offered my observations about what I saw there and how I know the slats and flaps deploy on the A320 family.
KayPam has offered to find out the real reason, which seems reasonable.
I have reported what I have seen in actual A320 and A321s when configuring for actual approaches.
I have watched the youtube clip James posted and have offered my observations about what I saw there and how I know the slats and flaps deploy on the A320 family.
KayPam has offered to find out the real reason, which seems reasonable.
Joined: Dec 2015
Posts: 507
Likes: 1
From: France
It's actually pretty simple and should occur in all configurations (most easily seen when flaps are extending)
When flaps lever is in intermediate position, coefficients for the computation of VLS change (increase) due to A/C realizing it is not in a stable phase of flight
When flaps lever is in intermediate position, coefficients for the computation of VLS change (increase) due to A/C realizing it is not in a stable phase of flight
Joined: Dec 2015
Posts: 507
Likes: 1
From: France
My previous message on this topic was guestimating.
For the above, I do have a very precise reference but if I told you I would have to kill you thereafter
The reason I was given is because the design office considered the A/C to not be in a stable phase of flight when flap lever is moved.
For the above, I do have a very precise reference but if I told you I would have to kill you thereafter
The reason I was given is because the design office considered the A/C to not be in a stable phase of flight when flap lever is moved.
