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20 Apr 2021, 19:03 [ UTC - 5; DST ]


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 Post subject: Watch a 747-8 perform an RTO at MTOW
PostPosted: 15 Apr 2021, 16:33 
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Joined: 04/16/11
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Company: P & S Machine
Location: Burlington, NC
Aircraft: Bonanza V35B
http://youtu.be/_g6UswiRCF0

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 Post subject: Re: Watch a 747-8 perform an RTO at MTOW
PostPosted: 15 Apr 2021, 16:52 
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Location: Florida panhandle
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I wonder what airport that is?

I remember seeing them doing similar tests on the 787 in Roswell on 3/21 (which is 13,000 feet long- I can see a 12 board in the video), but the mountains in the background of that video look different- and ROW doesn't have a Million Air.

The smoke show is impressive- I guess that is what a million pounds and 200mph looks like!


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 Post subject: Re: Watch a 747-8 perform an RTO at MTOW
PostPosted: 15 Apr 2021, 16:57 
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that was cool. I was waiting for 16 brake fires!

I thought the 747 was done? is the -8 the new variant? still being sold?

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 Post subject: Re: Watch a 747-8 perform an RTO at MTOW
PostPosted: 15 Apr 2021, 17:21 
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Username Protected wrote:
that was cool. I was waiting for 16 brake fires!

It's not every day you see glowing brakes, let alone that many of them, not unless you're a car racing fan or something like that.


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 Post subject: Re: Watch a 747-8 perform an RTO at MTOW
PostPosted: 15 Apr 2021, 17:35 
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Location: Cambridge, MA (KLWM)
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I wonder what airport that is?
Might be Moses Lake: https://www.airnav.com/airport/KMWH

(Boeing has a lot of 737-Maxes stored there now.)

Or Victorville, CA: https://www.airnav.com/airport/KVCV


Last edited on 15 Apr 2021, 17:38, edited 1 time in total.

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 Post subject: Re: Watch a 747-8 perform an RTO at MTOW
PostPosted: 15 Apr 2021, 17:35 
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Username Protected wrote:
that was cool. I was waiting for 16 brake fires!

I thought the 747 was done? is the -8 the new variant? still being sold?


The video is old. Also, some of these test have resulted in brake and tire fires. Watching the flames grow while the fire teams are standing by looking at their watches is fairly amusing as long as you aren’t part of the test team inside the burning jet full of fuel! :bugeye:

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 Post subject: Re: Watch a 747-8 perform an RTO at MTOW
PostPosted: 15 Apr 2021, 17:37 
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Username Protected wrote:
that was cool. I was waiting for 16 brake fires!

I thought the 747 was done? is the -8 the new variant? still being sold?


There are 12 747-8's left to build, after that the 747 is done.


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 Post subject: Re: Watch a 747-8 perform an RTO at MTOW
PostPosted: 15 Apr 2021, 18:11 
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I wonder what airport that is?
I'm guessing Mojave.

On the Space Shuttle, they installed a drag chute because of overheating brakes.


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 Post subject: Re: Watch a 747-8 perform an RTO at MTOW
PostPosted: 15 Apr 2021, 21:18 
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Thanks Matt, good video. The key here is to get it off the runway before the fuse plugs blow and you close the runway. :eek: Even then, depending on where the RTO happens, like a remote airport, it's usually good for a few days of layover while they ship in 16 tires and brakes. :D


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 Post subject: Re: Watch a 747-8 perform an RTO at MTOW
PostPosted: 15 Apr 2021, 21:36 
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Location: 5B2 Saratoga Springs, NY
Aircraft: N35+7GCBC w/floats
Landed the Citabria on pavement after removing floats, headed for the weeds, stayed on runway, but this is what I saw as trying to taxi off with full right brake & lots of power .... tire didn't pop .... might admit to the cause over a good Scotch


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 Post subject: Re: Watch a 747-8 perform an RTO at MTOW
PostPosted: 16 Apr 2021, 00:59 
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I love this video for the full appreciation of the trauma in play.

https://youtu.be/qew09gao3S8

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 Post subject: Re: Watch a 747-8 perform an RTO at MTOW
PostPosted: 16 Apr 2021, 07:09 
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This is what it looks like when it doesn't go so well

https://youtu.be/irTizOVM-3U


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 Post subject: Re: Watch a 747-8 perform an RTO at MTOW
PostPosted: 16 Apr 2021, 07:35 
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Company: USAF Simulator Instructor
Location: Wichita Valley Airport (F14)
Aircraft: Bonanza G35
Many years ago a friend of mine, also an Air Force pilot, was riding an airliner that rejected the takeoff. The crew stopped, popped the slides and evacuated the aircraft. My friend was near an exit and was one of the first down the slide so he started helping people off the slide. He was near a main gear and kept looking back at the brakes glowing cherry red. The people he helped off the slide mostly just wandered around in a daze, some of them walking past the brakes in the potential “frag pattern” out the sides of the wheels. He stopped helping people off the slide and started shooing them away from the brakes. Nothing blew and everybody evacuated ok as far as he knew. Lucky.

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 Post subject: Re: Watch a 747-8 perform an RTO at MTOW
PostPosted: 16 Apr 2021, 11:58 
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Username Protected wrote:
Many years ago a friend of mine, also an Air Force pilot, was riding an airliner that rejected the takeoff. The crew stopped, popped the slides and evacuated the aircraft. My friend was near an exit and was one of the first down the slide so he started helping people off the slide. He was near a main gear and kept looking back at the brakes glowing cherry red. The people he helped off the slide mostly just wandered around in a daze, some of them walking past the brakes in the potential “frag pattern” out the sides of the wheels. He stopped helping people off the slide and started shooing them away from the brakes. Nothing blew and everybody evacuated ok as far as he knew. Lucky.


Our mechanics always approached wheels with hot brakes at a 45 degree angle to avoid wheel frags and the tread which tend to blow longitudenally. And of course we'd give them a heads up for hot brakes.

Blowing the slides for emergency evac is a tough decision . Often somebody gets hurt, sometimes seriously or fatally, so that risk has to factored to the situation at hand. People were killed when a 747 with a collapsed nose gear did an emergency evac when they went out the back and the slides didn't reach the ground because they were blowing in the wind. Always best to coordinate with CFR on the scene to make the decision to blow the slides, including whether one side or both sides of the plane


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 Post subject: Re: Watch a 747-8 perform an RTO at MTOW
PostPosted: 16 Apr 2021, 14:22 
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Location: MCW
Aircraft: 7ECA
Username Protected wrote:
Our mechanics always approached wheels with hot brakes at a 45 degree angle to avoid wheel frags and the tread which tend to blow longitudenally. And of course we'd give them a heads up for hot brakes.

Blowing the slides for emergency evac is a tough decision . Often somebody gets hurt, sometimes seriously or fatally, so that risk has to factored to the situation at hand. People were killed when a 747 with a collapsed nose gear did an emergency evac when they went out the back and the slides didn't reach the ground because they were blowing in the wind. Always best to coordinate with CFR on the scene to make the decision to blow the slides, including whether one side or both sides of the plane


As airport firefighters, we have the same protocol for hot brakes. Wheel frag and the fuseable plug will go out at a 90 degree angle, tread tends to go fore and aft.

As a responder, I usually wouldn't encourage an evacuation for hot brakes unless we had an uncontrollable fire. Far better to shelter in place. Even if the tires blow, the fire will usually be minimal and can be controlled.


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