juventus
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CO`s Winglet 757s. Problems With Autoland

Fri Jan 07, 2005 12:35 am

My friend is a CO mechanic, based in IAH. I asked about the 757-winglet project that CO has undertaken. He said they are having problems, ``the winglets and autoland are not getting alone``. Is this true? Is it a speed, or a flare problem? anybody...
 
bapilot2b
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RE: CO`s Winglet 757s. Problems With Autoland

Fri Jan 07, 2005 12:39 am

Is there even a CO 757 with the winglets attached yet?? Suprised nobody has not shot it yet if there is one!
Jason Nicholls - v1images
 
CPH-R
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RE: CO`s Winglet 757s. Problems With Autoland

Fri Jan 07, 2005 12:54 am

Perhaps they're still in the test phase? IIRC, the 757 winglet programme is only just gearing up.
 
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solnabo
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RE: CO`s Winglet 757s. Problems With Autoland

Fri Jan 07, 2005 1:06 am

....and are there to be wing-lets on CO B753 too?

Micke/SE
Airbus SAS - Love them both
 
drerx7
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RE: CO`s Winglet 757s. Problems With Autoland

Fri Jan 07, 2005 1:18 am

Not on the 753s--not yet at least. The 753s role at CO is different from the 752s.
Third Coast born, means I'm Texas raised
 
gigneil
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RE: CO`s Winglet 757s. Problems With Autoland

Fri Jan 07, 2005 1:23 am

The test phase just began a few short days ago, so I would imagine some problems are to be expected.

N
 
Sinlock
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RE: CO`s Winglet 757s. Problems With Autoland

Fri Jan 07, 2005 3:22 am

I recall reading that in the early in the 737 (BBJ) winglet program that the center of lift on the wing moved forward a small %. Now that caused the Trim characteristics to change, in this case it made the 737 tend to over trim.
If an aircrafts center of lift moved aft then it would tend to under trim.
The 737s was having this issue at cruise and the autopilot was updated with a the changes.

A 757 in a landing configuration is very different from a 737 in cruise, but the principal of center of lift would basically be the same. A trim issue would certainly show up with the autopilot in an autoland mode, as most of the flight down the glideslope is done with trim, with the flare being done with elevator input.


 
aeroweanie
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RE: CO`s Winglet 757s. Problems With Autoland

Fri Jan 07, 2005 5:46 pm

Only the baseline (winglet off) flight tests have been completed. No flights have been made of any 757 with winglets. Hence, this report is nonsense.
 
Sinlock
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RE: CO`s Winglet 757s. Problems With Autoland

Sat Jan 08, 2005 5:05 am

My post was made with the assumption that information was based results found during simulation.
 
calpilot
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RE: CO`s Winglet 757s. Problems With Autoland

Sat Jan 08, 2005 9:17 am

Well From what I heard from a IOE Captain this is not nonsence Aero.

After the engineering came out, they discovered that the airplane would lose Cat3 because the Auto flight system softwear, did not recognize the changes during the "flare mode". They relized that the increased lift during ground effect, was going to produce a unacceptable over shoot in the touchdown zone.

I suspect the computer experts will solve this soon...?
 
aeroweanie
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RE: CO`s Winglet 757s. Problems With Autoland

Sat Jan 08, 2005 2:25 pm

Until the aircraft is flown with winglets, this is all speculation. The flare might change and it might not.
 
cdfmxtech
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RE: CO`s Winglet 757s. Problems With Autoland

Mon Jan 10, 2005 2:08 pm

The aircraft is being flown with the winglets if I am not mistaken.
 
aeroweanie
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RE: CO`s Winglet 757s. Problems With Autoland

Wed Jan 12, 2005 9:35 am

Just checked - the winglets have not been installed yet, so it hasn't flown with them.
 
Max Q
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RE: CO`s Winglet 757s. Problems With Autoland

Wed Jan 12, 2005 1:36 pm

Even if this was true, it's a non event, the NG 737's had the same problem, it will just require some refining and software changes, that's what a flight test program is for.

The bs that float's around airlines is endless but baffling in it's number of believers, before our 764's were delivered such priceless one's as 'there's no tail clearance so you'll have to rotate at 200kts' or 'with the new windows and the weight saved in the structure it bend's too much and will have to be redesigned' or 'it's so underpowered it will barely make NY-LA'

I wouldn't put much stock in ANYONES opinion until the flight test program is complete, as noone would know until then.
The best contribution to safety is a competent Pilot.

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