DYNASTY HVY

Is that before or after they collapsed ?
Might want to check out a certain Aeroflot vid. in the hangar section.



Ally

frozenboxhauler

Pretty impressive,...47 second ground roll for a baby-bus
fbh

mike734

Yeah, that did seem really long.

mundo1

I believe that you may be confusing the terms deicing and anti-icing. In the conditions you described, deicing was appropriate and anti-icing woud have been required by my company's SOP with visible moisture (rain) and temperature of + 4. Further, don't underestimate the liability and accountability consequences should you decide to "save" a few minutes by not deicing.

DYNASTY HVY

Is it possible that one of the crew was able to reach up and touch the snow during the walkaround to see if it was fresh or begiinning to get frozen over on this type of aircraft ?



Ally

FAULTPUSH

Only in terms of the impact on safety. A little frost on the spoilers has about the same impact on safety margins as a reduced thrust takeoff, and a whole lot less than taking off in rain or with deicing fluid on the wing.

You think so? Check this out:
http://www.youtube.com/watch?v=925MgqyU2NA&sns=em

TheFly

The numbers don't lie.

http://www.ntsb.gov/doclib/speeches/...ner_020111.pdf

FAULTPUSH

Scary stuff. Makes me glad I'm not flying a non-slatted wing any more.

FastDEW

Anyone know what airport this was? I'm curious as to altitude.....seems like a really long takeoff run for a baby bus.

DBate

If I am not mistaken (there are at least two long threads about this incident on pprune) I read that this was a flight departing Moscow, so altitude would not have been a factor in a 'longish' takeoff run.

Generally speaking:

I remember a FAA publication a couple of year ago regarding contamination on wings (it was pinned to a board in our briefing room). In it was written, that a contamination the size of one grain of sand per square centimeter could impede lift by up to 30%.

With that information it should be clear, why SOPs ask for a clean wing prior to departure. Of course, most aircraft could deal with a certain amount of contamination without any problems - having thrus on all engines available. But what happens in case you loose an engine after V1. With decreased lift on your wings AND a failed engine you would be in for a nice treat...

As for the comment of one of the other posters before concerning the fact that de-icing fluid also has an impact on lift; Whilst that might be correct, we are talking about certified fluids whose characteristics have been thouroughly tested and certified for ops. Snow is not! You might THINK that the snow will blow off, but you can never be sure what will really happen during takoff roll.

Cheers,
DBate