SWA overrun NTSB preliminary facts. - Page 4

Maximillian_Jenius · December 18th, 2005, 12:47

...sorry to hear bout the furlough hopefully your on to bigger and better things in your aviation career!

-Matthew

FlyChicaga · December 18th, 2005, 16:55

How much of a delay in sensing does the B738 FMS have in the wind vector display? I know ours is a minute or more. Takes only two minutes to get from 2000 feet to the runway on the approach, therefore at least in our aircraft the FMS reported winds are not extremely accurate for touchdown winds. Plus, winds at 300 feet AGL (especially at MDW with the fenceline) are often much different than at the surface. I've noticed normally around 300-600 feet is where you get a slight "shear" with surface and winds for the approach.

We didn't have the luxury of an FMS wind vector in the Saab at MDW, so we just went by ATC.

I've never landed there with more than a 10 knot reported tailwind. I have experienced many times a large variation in the surface wind there though, like the time we had a 30 knot loss in the flare with winds from 250 @ 35 landing 31C. MDW is certainly a different breed of animal, that's for sure.

If the winds were from an easterly heading, I'm not sure why they weren't just landing 4R. Even though the DA is 100+ feet higher, it would have made a great benefit for landing distance in this case.

Doug Taylor · December 18th, 2005, 17:06

I don't know if it even has much of a delay in the -88, the usually seemed fairly consistent with what ATC was saying unless there was an ulterior motive.

Best bet I've learned? The windsock. But I wish the FAA would do a better job with regulations about them being available, discernable and well-lit.

Cruise · December 19th, 2005, 01:48

Quote:

Originally Posted by Doug Taylor

Best bet I've learned? The windsock. But I wish the FAA would do a better job with regulations about them being available, discernable and well-lit.

I'll second that.......

FlyChicaga · December 19th, 2005, 17:36

Quote:

Originally Posted by Doug Taylor

Best bet I've learned? The windsock. But I wish the FAA would do a better job with regulations about them being available, discernable and well-lit.

Seriously! There are many airports where I'll get down to around 200 feet and start looking for the windsock, and can't find one. I always use it to determine how to flare and adjust for a crosswind. Irks me when it's not there... really, how much does it cost? For a piece of orange fabric, a pole, and a lightbulb?

December 18th, 2005, 12:47	#76
Maximillian_Jenius Old Skool Join Date: Nov 2003 Location: KPHX, KFFZ, KIWA Posts: 19,032	...sorry to hear bout the furlough hopefully your on to bigger and better things in your aviation career! -Matthew __________________ Rear Admiral www.gayviator.com Maximillian Pegasus

December 18th, 2005, 16:55	#77
FlyChicaga Old Skool Join Date: Dec 2001 Location: Chicago, IL Posts: 4,833	How much of a delay in sensing does the B738 FMS have in the wind vector display? I know ours is a minute or more. Takes only two minutes to get from 2000 feet to the runway on the approach, therefore at least in our aircraft the FMS reported winds are not extremely accurate for touchdown winds. Plus, winds at 300 feet AGL (especially at MDW with the fenceline) are often much different than at the surface. I've noticed normally around 300-600 feet is where you get a slight "shear" with surface and winds for the approach. We didn't have the luxury of an FMS wind vector in the Saab at MDW, so we just went by ATC. I've never landed there with more than a 10 knot reported tailwind. I have experienced many times a large variation in the surface wind there though, like the time we had a 30 knot loss in the flare with winds from 250 @ 35 landing 31C. MDW is certainly a different breed of animal, that's for sure. If the winds were from an easterly heading, I'm not sure why they weren't just landing 4R. Even though the DA is 100+ feet higher, it would have made a great benefit for landing distance in this case. __________________ "Anyone can do the job when things are going right. In this business we play for keeps." Ernest K. Gann

December 18th, 2005, 17:06	#78
Doug Taylor Agent Smith Join Date: Dec 1969 Location: KSDL Posts: 41,223 Blog Entries: 1	I don't know if it even has much of a delay in the -88, the usually seemed fairly consistent with what ATC was saying unless there was an ulterior motive. Best bet I've learned? The windsock. But I wish the FAA would do a better job with regulations about them being available, discernable and well-lit. __________________ Doug Taylor http://76school.flyblog.com (old!) http://30west.flyblog.com (updated 11/28)

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