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13 Jun 2021, 20:00 [ UTC - 5; DST ]


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 Post subject: Re: Watch a 747-8 perform an RTO at MTOW
PostPosted: 16 Apr 2021, 20:40 
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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.


David, thanks for your insight as a responder and comment on uncontrollable fire. It's a real judgement call. Flying the Hadj with 500 passengers, many whom had never been on a plane, an emergency evac was something I hoped I would never have to do, and fortunately I didn't. It would have been pandemonium with likely loss of life just in the evac.

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 Post subject: Re: Watch a 747-8 perform an RTO at MTOW
PostPosted: 16 Apr 2021, 21:46 
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This is what it looks like when it doesn't go so well

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


5:31 "It's not an important fire"

Yea, about that on an airplane...


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 Post subject: Re: Watch a 747-8 perform an RTO at MTOW
PostPosted: 17 Apr 2021, 07:38 
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Username Protected wrote:
This is what it looks like when it doesn't go so well

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


I do love the French (after all, we fly one of their planes). but there's something comical about "it's not a serious fire..." and "stairs...," "stairs..." (i'm imagining the crew calmly sitting in the flight deck)

Americans be like "i'm outta here..."

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 Post subject: Re: Watch a 747-8 perform an RTO at MTOW
PostPosted: 17 Apr 2021, 09:13 
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Americans be like "i'm outta here..."


Quite the opposite actually! In the Boeing test I saw where there was a fire, actually multiple fires, everyone was far more calm. The fire crews waited patiently for the allotted time, and no one was rushing to bring stairs.

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 Post subject: Re: Watch a 747-8 perform an RTO at MTOW
PostPosted: 17 Apr 2021, 12:23 
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We fly a daily route to TLS, and every other day one of the runways is closed for some flight test at Airbus.

A few months ago, it was raining quite a lot, and the notam said 32L was closed. The runway was really wet, and as I was doing the walk-around, a brand new 350-1000 was lining up on 32L.

The RTO in itself is pretty impressive, and strangely not that noisy. But once the airplane was stopped... The amount of vapour from the wheel wells! And even from the gate, you could see the glowing, red hot brakes, through the vapour.

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 Post subject: Re: Watch a 747-8 perform an RTO at MTOW
PostPosted: 19 Apr 2021, 11:01 
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Username Protected wrote:
David, thanks for your insight as a responder and comment on uncontrollable fire. It's a real judgement call. Flying the Hadj with 500 passengers, many whom had never been on a plane, an emergency evac was something I hoped I would never have to do, and fortunately I didn't. It would have been pandemonium with likely loss of life just in the evac.


It is preferred, as long as its safe to do so, to avoid evacuation. As you pointed out there is a risk of injury during an evacuation. From our standpoint as the responder, once the seal is broken and people are coming out, we now have to divide our attention between fire attack and crowd control.

Now if the smoke and flames are impinging on the fuselage, then we have to get the people out no doubt about it. That is mission #1 of ARFF, secure a rescue path so the occupants can self extricate. Most airports aren't staffed and equipped to do much more than that.


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 Post subject: Re: Watch a 747-8 perform an RTO at MTOW
PostPosted: 19 Apr 2021, 22:31 
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Company: Corporate Air Technology
Aircraft: Pa28-235
Speaking of exploding wheels this video of Alberth Aviation tire cage variants is always a fun watch.

https://www.youtube.com/watch?v=4gBHoeB1vfk


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