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Old 04-17-2010, 09:51 AM
 
Location: By the sea, by the sea, by the beautiful sea
68,437 posts, read 54,934,362 times
Reputation: 40964

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Quote:
Originally Posted by GCSTroop View Post
Yeah. It most certainly is but there are a number (a plethora, actually) of aircraft systems that rely on raw air data to do a number of other functions. On many aircraft, airspeed (from the air data systems) is also tied to the operation of certain flight controls in various phases of flight. For example, on many aircraft, depending on your speed, various flight control movements are dampened to prevent an excessive movement around any given axis. If you kick the rudder left three degrees while going 350 kts. it's going to have a far more pronounced effect than if you kick it three degrees left while going 200 kts. Systems like that are almost always exclusively fed by computed airspeed data originating from the airspeed (pitot) sensors. If they're clogged with volcanic ash, it could affect a number of other systems. While the pilots could still gather airspeed data from GPS to get an accurate depiction of where they're headed and where they need to go, there a number of systems still dependent on that air data information coming from the pitot/static systems.

I was just thinking the USAF probably has access to a few tricks that might well be prohibitively expensive to the commercial fleet.
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Old 04-17-2010, 10:07 AM
 
Location: 3rd rock from the sun
3,857 posts, read 6,996,979 times
Reputation: 1817
The main danger, as shown in the 1982 incident, is starving the engines of air. All 4 engines of British Airways 747 Flight 9 shut down and didn't restart until the plane fell below 14,000 feet - below the ash.

Flying at 14,000 feet uses much more fuel and speed is slower, than at 35,000 feet - a consideration for airlines flying granny to Manchester on a bargain basement fare. Air Force 1 and military planes don't have these economic restraints & AF1 would have more resources to detect and avoid.

http://en.wikipedia.org/wiki/British_Airways_Flight_9

Typical British understatement:
Ladies and gentlemen, this is your captain speaking. We have a small problem. All four engines have stopped. We are doing our damnedest to get them under control. I trust you are not in too much distress.
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Old 04-17-2010, 02:03 PM
Kuh
 
51 posts, read 39,357 times
Reputation: 19
I just read that they did cancel Obama's flight. That really is too bad! Poor Poland... first the plane crash and now this.
Gosh, what a mess over there! I also heard that this volcano's last eruption back in the 18th century lasted 2 years
I've got a flight scheduled to Germany for May 5th. I hope everything is gonna be ok by then!
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Old 04-17-2010, 02:12 PM
 
Location: West Coast of Europe
25,947 posts, read 24,953,286 times
Reputation: 9728
Several presidents, prime ministers etc. had to cancel their flights to Poland, but frankly I guess people have been making too much of a fuss about that polish politician. Sure, it is sad whenever someone dies, but I assume most people had never even heard of that guy.
I am sure there are official representatives such as diplomats and consuls of all countries taking part in the funeral
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Old 04-17-2010, 04:54 PM
 
Location: Inland Empire, Calif
2,884 posts, read 5,668,993 times
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I hope dumbo goes. Poland needs a president and we have a useless one we sure would like to dump. maybe we can make a deal and unload some garbage on them.. We could probably get some sausage for him...
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Old 04-17-2010, 09:12 PM
 
Location: Foot of the Rockies
90,295 posts, read 121,551,497 times
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From about 8 hours ago:

Volcanic Ash Forces Obama To Cancel Trip To Polish President's Funeral - The Two-Way - Breaking News, Analysis Blog : NPR
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Old 04-17-2010, 09:29 PM
 
4,500 posts, read 12,410,433 times
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I was about to say, Norwegian press is reporting that Obama will miss the funeral, as will many other heads of state.
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