rdale
EF5
What Jeff is saying is that it's really not possible for downward air to move 12,000 feet in 60 seconds at that level.
Plane damaged by hail makes emergency landing
- Thread starter John Farley
- Start date
MClarkson
EF5
http://flightaware.com/live/flight/DAL1889/history/20150807/2130Z/KBOS/KDEN/tracklog
The flightaware track is pretty clear: The aircraft descended at the reasonable rate of about 2000 feet per minute. This was an intentional descent initiated after the hailstorm. The aircraft had to descend into Denver and it would be quite reasonable to distrust the integrity of ones windshields after that. I don't know where the 12,000 fpm quote started, but like most generic media reports on aviation, is clearly wrong.
The flightaware track is pretty clear: The aircraft descended at the reasonable rate of about 2000 feet per minute. This was an intentional descent initiated after the hailstorm. The aircraft had to descend into Denver and it would be quite reasonable to distrust the integrity of ones windshields after that. I don't know where the 12,000 fpm quote started, but like most generic media reports on aviation, is clearly wrong.
ScottCurry
EF3
OK, obviously the aircraft in this article did not descend as fast as the media reported. But it is possible for an aircraft to descend that fast...
http://www.rvs.uni-bielefeld.de/publications/Incidents/DOCS/ComAndRep/ChinaAir/AAR8603.html
According to this accident report, in 1985 a commercial airliner descended at a rate of 18,745 feet per minute. The aircraft experienced a peak force of 5.1G, causing damage to the plane. The plane landed safely and amazingly only 2 people were seriously injured and there were no fatalities.
"Between 1014:50 and 1015:23, the DFDR recorded a 10,310-foot descent to 30,132 feet." -- That's a 10,310 foot descent in only 33 seconds.
"Between 1015:23 and 1017:15, the airplane descended from 30,132 feet to 9,577 feet." -- That's a 20,555 foot descent in only 1 minute and 52 seconds.
http://www.rvs.uni-bielefeld.de/publications/Incidents/DOCS/ComAndRep/ChinaAir/AAR8603.html
According to this accident report, in 1985 a commercial airliner descended at a rate of 18,745 feet per minute. The aircraft experienced a peak force of 5.1G, causing damage to the plane. The plane landed safely and amazingly only 2 people were seriously injured and there were no fatalities.
"Between 1014:50 and 1015:23, the DFDR recorded a 10,310-foot descent to 30,132 feet." -- That's a 10,310 foot descent in only 33 seconds.
"Between 1015:23 and 1017:15, the airplane descended from 30,132 feet to 9,577 feet." -- That's a 20,555 foot descent in only 1 minute and 52 seconds.
MClarkson
EF5
Man, that is quite a plunge(Scotts link, not the DAL A320). 5.1G pulling out of that dive? In a 747. Good thing Boeing makes good planes. Transport planes are regulated only up to 3.8G if I remember correctly. Look at that horizontal stabilizer!
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