Happy-flier
Topic Author
Posts: 286
Joined: Sat Dec 25, 1999 4:41 pm

MD-11 Flaperon Use Vs. Non-use

Thu Dec 03, 2009 5:30 pm

An interesting thing has come to my attention as I browse photos of MD-11s in action. It appears that while the MD-11 is able to use both inboard and outboard ailerons simultaneously as flaperons, to augment flap function much as the 777 does, in some cases, it is clear that they are not used, and the MD-11 wing in those cases appears to function exactly as its predecessor, the DC-10 (i.e. just flaps, while inboard and outboard ailerons are flush).

Why is this? What flight management decision governs whether a crew will program the system to droop ailerons for flap augmentation, or not?
May the wind be always at your back . . . except during takeoff & landing.
 
DL_Mech
Posts: 2061
Joined: Fri Feb 18, 2000 7:48 am

RE: MD-11 Flaperon Use Vs. Non-use

Thu Dec 03, 2009 5:53 pm

Not all MD-11 a/c are equipped with it ( I think it was a Service Bulletin)..IIRC, If you look on the Ident page of the FMS it is either "MD-11" or "MD-11 DEF AIL"
This plane is built to withstand anything... except a bad pilot.
 
Happy-flier
Topic Author
Posts: 286
Joined: Sat Dec 25, 1999 4:41 pm

RE: MD-11 Flaperon Use Vs. Non-use

Thu Dec 03, 2009 6:17 pm

Interesting. I had another thought after posting: Maybe using more trailing edge flap but no aileron deflection (e.g. 30º flap for takeoff) would mean that a tailstrike on takeoff would be less likely than if you used, say, 10º flap + aileron deflection.

Just a thought.
May the wind be always at your back . . . except during takeoff & landing.
 
113312
Posts: 580
Joined: Sat Apr 16, 2005 9:09 am

RE: MD-11 Flaperon Use Vs. Non-use

Thu Dec 03, 2009 11:51 pm

At our airline, most MD11 takeoffs are with Flap 25 and no aileron deflection. Note that the leading edge slats on the MD11 have two positions: Extended and Retracted.

On the DC10-30, the slats have 3 positions: Retract, Takeoff, and LDG.

Most takeoffs in the DC10 (MD10)-30 are with Flaps 20.
 
CosmicCruiser
Posts: 2049
Joined: Tue Feb 22, 2005 3:01 am

RE: MD-11 Flaperon Use Vs. Non-use

Fri Dec 04, 2009 12:04 am

As far as I know they came with it but some aren't used. We used them for a short time after I chkd out in the MD-11 and then they were disabled due to maint costs.
 
bri2k1
Posts: 952
Joined: Sun Dec 19, 2004 4:13 am

RE: MD-11 Flaperon Use Vs. Non-use

Fri Dec 04, 2009 2:27 pm



Quoting 113312 (Reply 3):
At our airline, most MD11 takeoffs are with Flap 25 and no aileron deflection.

I must be misunderstanding this. No aileron deflection? What if there's a crosswind?
Position and hold
 
CosmicCruiser
Posts: 2049
Joined: Tue Feb 22, 2005 3:01 am

RE: MD-11 Flaperon Use Vs. Non-use

Fri Dec 04, 2009 2:38 pm



Quoting Bri2k1 (Reply 5):
must be misunderstanding this. No aileron deflection? What if there's a crosswind?

He's talking about "drooped" ailerons. Nothing to do with a x-wind.

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