QF 747-400 blows 4 tires during aborted takeoff at LAX
03-25-2008, 09:35 AM
#1
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QF 747-400 blows 4 tires during aborted takeoff at LAX
747 blows 4 tires, aborts takeoff from LAX
None of the 232 passengers or crew hurt on Australia-bound jetliner
http://www.msnbc.msn.com/id/23790476
The media is making this out as the 747 blew 4 tires, then aborted as a result; which maybe the correct sequence of events.
However, it says that the CA noticed a warning light go off during the t/o and so decided to abort. Wouldn't it be more likely that after the decision was made to abort, that the tires then blew out during deceleration on the rejected t/o?
Discuss
None of the 232 passengers or crew hurt on Australia-bound jetliner
http://www.msnbc.msn.com/id/23790476
The media is making this out as the 747 blew 4 tires, then aborted as a result; which maybe the correct sequence of events.
However, it says that the CA noticed a warning light go off during the t/o and so decided to abort. Wouldn't it be more likely that after the decision was made to abort, that the tires then blew out during deceleration on the rejected t/o?
Discuss
03-25-2008, 10:23 AM
#2
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I read this article too and wondered how you could blow 4 tires on takeoff, then abort. Now, I see how you could blow 4 tires after slamming yourself down after abort. Either way, I'm glad they got her slowed down and no one was hurt.
03-25-2008, 10:38 AM
#3
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Brake-Energy and Aborted Takeoffs
I used to fly the -400. During ground school, they showed us the certification video of the -400 doing a max gross-weight rejected takeoff.
The jet has carbon brakes. As they initiated abort at V1, the jet passed the camera--the brakes were visibly glowing cherry-red to dull-white-hot.
After the abort, it takes about 20-30 minutes, but the heat propagates through the brakes and rim to heat up the nitrogen in the tires. This causes the tire pressure to increase dramatically.
To prevent the tires from blowing up (which can be damaging or lethal), the rims have fuse plugs. Think of it as a hole sealed with lead or solder. This has been true on all 7 types of jets I have flown. They melt and blowout the tire pressure in a controlled fashion.
Probably what happened here.
The jet has carbon brakes. As they initiated abort at V1, the jet passed the camera--the brakes were visibly glowing cherry-red to dull-white-hot.
After the abort, it takes about 20-30 minutes, but the heat propagates through the brakes and rim to heat up the nitrogen in the tires. This causes the tire pressure to increase dramatically.
To prevent the tires from blowing up (which can be damaging or lethal), the rims have fuse plugs. Think of it as a hole sealed with lead or solder. This has been true on all 7 types of jets I have flown. They melt and blowout the tire pressure in a controlled fashion.
Probably what happened here.
03-25-2008, 12:36 PM
#5
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Originally Posted by tpaRob
Thanks for the explanation. How fast would that plane be going at V1?
03-25-2008, 01:04 PM
#7
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Originally Posted by UAL T38 Phlyer
The jet has carbon brakes. As they initiated abort at V1, the jet passed the camera--the brakes were visibly glowing cherry-red to dull-white-hot.
After the abort, it takes about 20-30 minutes, but the heat propagates through the brakes and rim to heat up the nitrogen in the tires. This causes the tire pressure to increase dramatically.
To prevent the tires from blowing up (which can be damaging or lethal), the rims have fuse plugs. Think of it as a hole sealed with lead or solder. This has been true on all 7 types of jets I have flown. They melt and blowout the tire pressure in a controlled fashion.
Probably what happened here.
After the abort, it takes about 20-30 minutes, but the heat propagates through the brakes and rim to heat up the nitrogen in the tires. This causes the tire pressure to increase dramatically.
To prevent the tires from blowing up (which can be damaging or lethal), the rims have fuse plugs. Think of it as a hole sealed with lead or solder. This has been true on all 7 types of jets I have flown. They melt and blowout the tire pressure in a controlled fashion.
Probably what happened here.
)http://www.youtube.com/watch?v=UocxPoUUnIQ - punchline is at 8 minutes
Looks like someone posted the Boeing Go/No-Go videos:
http://www.youtube.com/watch?v=raCnJgDnijw Pt 1
http://www.youtube.com/watch?v=WhVVA...eature=related Pt 2
03-28-2008, 12:09 PM
#9
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Originally Posted by HSLD
Here is a certification video to illustrate thermal failure of the fuse plugs (a fancy way of saying things get hot....and melt )
http://www.youtube.com/watch?v=UocxPoUUnIQ - punchline is at 8 minutes
Looks like someone posted the Boeing Go/No-Go videos:
http://www.youtube.com/watch?v=raCnJgDnijw Pt 1
http://www.youtube.com/watch?v=WhVVA...eature=related Pt 2
)http://www.youtube.com/watch?v=UocxPoUUnIQ - punchline is at 8 minutes
Looks like someone posted the Boeing Go/No-Go videos:
http://www.youtube.com/watch?v=raCnJgDnijw Pt 1
http://www.youtube.com/watch?v=WhVVA...eature=related Pt 2
03-28-2008, 02:57 PM
#10
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I'm impressed it wasn't all the tires blown. Way to go QF!
Spongebob
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