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MD-11 Flaperon Use Vs. Non-use  
User currently offlineHappy-flier From Canada, joined Dec 1999, 299 posts, RR: 0
Posted (4 years 10 months 3 weeks 5 days 13 hours ago) and read 3345 times:

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.
6 replies: All unread, jump to last
 
User currently offlineDL_mech From United States of America, joined Feb 2000, 1968 posts, RR: 9
Reply 1, posted (4 years 10 months 3 weeks 5 days 13 hours ago) and read 3327 times:

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.
User currently offlineHappy-flier From Canada, joined Dec 1999, 299 posts, RR: 0
Reply 2, posted (4 years 10 months 3 weeks 5 days 12 hours ago) and read 3312 times:

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.
User currently offline113312 From United States of America, joined Apr 2005, 573 posts, RR: 1
Reply 3, posted (4 years 10 months 3 weeks 5 days 7 hours ago) and read 3216 times:

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.


User currently offlineCosmicCruiser From United States of America, joined Feb 2005, 2255 posts, RR: 15
Reply 4, posted (4 years 10 months 3 weeks 5 days 7 hours ago) and read 3210 times:

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.

User currently offlineBri2k1 From United States of America, joined Dec 2004, 988 posts, RR: 4
Reply 5, posted (4 years 10 months 3 weeks 4 days 16 hours ago) and read 3025 times:



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
User currently offlineCosmicCruiser From United States of America, joined Feb 2005, 2255 posts, RR: 15
Reply 6, posted (4 years 10 months 3 weeks 4 days 16 hours ago) and read 3023 times:



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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