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Aviation => Aviation News (General) => Topic started by: RonR on January 07, 2014, 08:30:06 AM

Title: Heavy Jet Reverse Thrust Action on a Wet Runway
Post by: RonR on January 07, 2014, 08:30:06 AM
Video showing a number of heavy jets landing on a wet runway.  Gives you an idea of the power of these big engines.

One thing I noticed though, the first plane in the video is a 747-400 and she used all four engines in reverse while a little later on there was an A380 and that plane only used the two inboard engines in reverse, not the other two.  Just wondering, is this SOP for the A380?  I never noticed that before...

Ron

https://www.youtube.com/watch?v=eu9OIZhCOvM
Title: Re: Heavy Jet Reverse Thrust Action on a Wet Runway
Post by: joeyb747 on January 07, 2014, 11:14:20 AM
...only used the two inboard engines in reverse, not the other two.  Just wondering, is this SOP for the A380?  I never noticed that before..
https://www.youtube.com/watch?v=eu9OIZhCOvM

Yes, that is SOP on the A380. The A380 is only equipped with TR on the inboard powerplants. The most significant reason is that on standard width runways, the outboard powerplants are over or near the edges, and deploying TR over grass would throw dirt, grass and what not into the air, causing a FOD nightmare. Secondly, the A380 is certified to stop without using any TR, as she has very large brakes. TR aids slowing on short runways, poor braking action situations (wet/snow/ice), or when an early turnoff is needed. Hope this helped!
Title: Re: Heavy Jet Reverse Thrust Action on a Wet Runway
Post by: RonR on January 07, 2014, 11:25:34 AM
Thanks Joeyb, that answers it.  It never occurred to me that their outboards might hang out further than those of a 747...

Here's a good pic that shows the size comparison...
Title: Re: Heavy Jet Reverse Thrust Action on a Wet Runway
Post by: joeyb747 on January 07, 2014, 11:30:21 AM
That is a great size comparison. I've seen an AN225 up close only one time...talk about MASSIVE!!  :-o 8-)
Title: Re: Heavy Jet Reverse Thrust Action on a Wet Runway
Post by: RonR on January 07, 2014, 11:44:11 AM
Yeah, looks like you could fit an aircraft carrier in that monster  :-)
Title: Re: Heavy Jet Reverse Thrust Action on a Wet Runway
Post by: ORD Don on January 07, 2014, 02:50:27 PM





                  Very cool video !!        Thanks for the post....
Title: Re: Heavy Jet Reverse Thrust Action on a Wet Runway
Post by: Flyingnut on January 10, 2014, 10:13:09 PM
...Secondly, the A380 is certified to stop without using any TR, as she has very large brakes....

Regarding the A380 brakes, this new video from JustPlanes has some info.  In the 5 minute portion of the video, the captain shows the computed turnaround of 145-165 minutes due to brake cooling.

http://youtube.com/watch?v=ryO170RPwZg