A320 ailerons during rollout

[sierra_mike]

hi busdrivers!

i recently noticed, that the ailerons of A320 with sharklets are being deflect upwards during rollout without any sidestick input. i'm not 100% sure, but i suppose they deflect upwards simultaneously with ground spoiler extension to support deceleration. the ailerons of a classic A320 don't show that "behaviour" and remain in the neutral position without sidestick input. I searched the FCOM but i couldn't find any information about that so far. can anybody here give me a FCOM reference or some additional information about that (new?) aileron function?

[onehundred]

This is what i found i my companys fcom. It applies to a A319-111:

"GROUND SPOILER CONTROL
The ground spoiler function involves all spoilers and ailerons (“aileron anti-droop” function)."

[NZScion]

Not familiar with Airbuses generally, but I know this happens on the larger aircraft such as A330 and A340. Maybe it has been introduced alongside the sharklets on the A320?

[sierra_mike]

thanks for the replies! interestingly the FCOM of the respective aircrafts states

GROUND SPOILER CONTROL
Spoilers 1 to 5 act as ground spoilers.

i also searched the respective FCOM for "anti-droop" without any results. hmmmmmm :suspect:

onehundred, can you maybe give me the the chapter where u found the anti-droop information? thx!

[I-2021]

Hi sierra,

Onehundred is referring to a specific modification called the "florence kit" available for A319s and 318s that basically allows the ailerons to raise with the spoilers upon touchdown for better landing performances on very short runways (like Florence, Italy). I am not aware of the same kit being available for the A320 so far, but maybe somebody will shed some light on that.

Cheers.

[Cough]

More than just A320's.... Scroll to about 2:50... This is a 321...

TlDYK-OnmXw

[I-2021]

Thanks Cough !

[Uplinker]

And I guess London city as well?

[Capt Claret]

Not A320 but it's interesting how many folk roll out, with aileron input to try & maintain the centre line. All it does is prevent me seeing the speed tape and making the required calls.

I of course know that it's not a steering wheel and rolling left won't regain the c/l! :}

[compressor stall]

Not a problem with a sidestick!

[Cough]

Uplinker - Just looked - very surprisingly not! However, at the low landing speeds of the A318 I recon the effect could only be minor...

[ChristiaanJ]

Cough,
Thanks for the video, good illustration !
Totally off-topic, but it was also a good recording of the barking dog in the wheel well.

[sierra_mike]

question is answered now:

The ailerons are fully-extended, provided one aileron servocontrol is available on each side, when: - The ground spoilers are fully extended
- Flaps are not in clean CONF
- Pitch attitude is lower than ​2.5 °
- Flying manually
- In normal law only.

Ref: FCOM/DSC/27/10/20/SPEED BRAKES AND GROUND SPOILERS

[John Farley]

Anything to reduce wing lift in the landing roll of any aircraft has to be good news?

[dream747]

Any chance this have anything related to the Load Allevation Control function?

[sierra_mike]

the load alleviation function is intended to relieve structural loads during manoeuvring and gust turbulence.

[vilas]

I 2021and one hundred
You are correct this is aileron anti droop function installed vide MOI 34097 to improve braking effiency during landing, reject takeoff and operation on short runways.

[ilya1502]

I'll leave this here more for myself or others who seek a reference.

I could not find this in the FCOM as well, but this is mentioned in the Service Bulletin on the introduction of the standard 1.9.0 as for 25-Apr-2014 (p. 9):

ELAC L94 to L96:
Basic Aileron up deflection (25˚) at landing for Ground Spoiler efficiency

[JammedStab]

I noticed about a year ago on an airline that I fly regularly that both ailerons would deflect fully upward on landing roll. It didn't used to happen and the airline is not having Airbuses delivered. Therefore, I have been assuming that this is a software mod designed to improve landing performance, perhaps more so on contaminated runways.

I believe that the 787 is doing the same thing but have not seen it on the 777.

[Vessbot]

"Aileron anti-droop?"

Shoulda called it "aileron perk."