View Full Version : Airbus A320 Family Ailerons

17th Mar 2009, 18:08
Do both ailerons on the wings raise together in the same direction on landing to assist the spoilers ?

Engine overtemp
17th Mar 2009, 18:25
Nope but they both droop a bit with the flaps.

17th Mar 2009, 18:26
No, only the ground spoilers (1 to 5) on each wing will deploy.

17th Mar 2009, 18:51
There is a video showing the A318 landing at london city Airport and looking at the ailerons from the back it looks like both ailerons are in an up position.

I know from my knowledge this should not happen , but has airbus introduced new software for this to happen.

Nick 1
17th Mar 2009, 18:55
Are those ones with the electronic packages for short runway ops.

Nick 1

Swedish Steve
17th Mar 2009, 20:11
Are those ones with the electronic packages for short runway ops.

The Airbus A318 demonstrator that landed at LCY had the 6deg glideslope mod fitted. It is now approved and the first production aircraft will be the two BA A318 to be delivered in Aug/Sep this year

17th Mar 2009, 20:53

Sorry this doesn't really answer the original question but thought you might be interested.
I'm neither a pilot nor an proper engineer (2nd year Aeronautical Engineering) but I believe the A320 series has gust alleviation which deflects the ailerons upwards to reduce the load on the wing structure. (Don't ask me to explain how this is achieved with regards to control systems etc though!)

Alistair Strong

Swedish Steve
17th Mar 2009, 22:17
The original A320s built in 87/88 had a gust alleviation system that used a pair of spoilers on each wing. There is a little nitrogen cylinder that is used to push the spoilers up. Later A320 don't have this. The ailerons are not involved. I don't know when this stopped, but 99 built don't have it.

17th Mar 2009, 23:21
LAF (load alliviation function)

Its coming back for increased TOGW.


Airbus (http://www.airbus.com) has started formally offering A320 (http://www.flightglobal.com/landingpage/airbus%20a320.html) customers a modification to increase the type's maximum take-off weight, available through a software upgrade to its flight-control system.
The airframer says the upgrade raises the MTOW to 78t, an increase of about 1t, providing around 150nm (278km) additional range.
Airbus (http://www.flightglobal.com/landingpage/airbus.html) is expecting International Aero Engines (http://www.v2500.com/) V2500 (http://www.v2500.com/)-powered versions to be certified this month, and CFM International (http://www.cfm56.com/) CFM56 (http://www.cfm56.com/) variants next March.
The modification takes advantage of the A320 (http://www.flightglobal.com/landingpage/airbus%20a320.html)'s load-alleviation system, software which uses control surfaces of the wings - the ailerons and outer spoilers - to relieve structural loads during manoeuvring and gust turbulence.
While aspects of the load-alleviation function were originally introduced for a specific certification purpose, these subsequently became redundant. The software was removed, although the mechanical systems in the wing remained in place.
But Airbus has concluded that, with new software, it can use the load-alleviation system to increase the A320's payload-range capability

Dan Winterland
18th Mar 2009, 12:58
The MLA function uses an accumulator, not a nitrogen bottle. The accumulator has hydraullic fluid one side of a piston, pressurized nitrogen the other. Accumulators damp out fluctuations in the hydraullic system pressure caused by changes in demand.

18th Mar 2009, 17:05
The modification is called the florence kit and it is to allow landings at airports such as London city

tubby linton
27th Mar 2010, 13:13
I remember walking around a 320 on the ground and the starboard aileron was drooping down but the other wasn't.The aircraft had LAF fitted.

I cannot remember now why it does this.Any answers?

27th Mar 2010, 17:38
Hi tubby,

When the aircraft are brand new, and after hydraulic pressure has decayed, the ailerons remain in their neutral position for a considerable time. With age, the leak rate past the various valves in the hydraulic flight control system increases, and the aileron(s) will droop over time. It's perfectly normal.

27th Mar 2010, 18:01
Left Aileron is G+B, Right Aileron is B+Y.

As the cargo doors are Yellow system powered, nearly anytime the aircraft is being loaded or unloaded the Yelllow system will have been recently pressurized, thus the right aileron is in trail and the left droops.

Edit: Yeah, the entirety of this post was in error, that's what I get for guessing instead of looking it up.

27th Mar 2010, 18:22
You're not quite right Cardinal. Yeah the cargo doors are operated by the yellow hydraulic system electric pump but when selecting a door to open or close........only the door system is pressurised. We can't have loaders pressurising the whole yellow system can we!

tubby linton
27th Mar 2010, 19:10
Cardinal on my old 320s the ailerons are both on blue and green.

28th Mar 2010, 07:07
There is a video showing the A318 landing at london city Airport and looking at the ailerons from the back it looks like both ailerons are in an up position.

Hello Everyone,
the Airbus A318 is certified for steep approach operations (from -4.5 to -5.5 FPA). In order to increase the descent capability and to cope with the -5.5 slope, the following aerodynamic configuration has been chosen for approach: GEAR DOWN + CONF FULL + SPD BRKS lever FULL (Spoilers 3+4 are extended to 30).

At around 85ft speed brakes automatically retracts to 8; they fully deploy at touchdown. Here my guess is that ailerons will partially deploy, assisting the spoilers doing their job (at touchdown). Thrust levers must both be at idle ...

Best Regards,

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