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Author Topic: Heavy Jet Reverse Thrust Action on a Wet Runway  (Read 22242 times)

Offline RonR

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Heavy Jet Reverse Thrust Action on a Wet Runway
« on: January 07, 2014, 13:30:06 UTC »
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

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Offline joeyb747

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Re: Heavy Jet Reverse Thrust Action on a Wet Runway
« Reply #1 on: January 07, 2014, 16:14:20 UTC »
Quote from: ronr530 on January 07, 2014, 13:30:06 UTC
...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..


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!
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Offline RonR

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Re: Heavy Jet Reverse Thrust Action on a Wet Runway
« Reply #2 on: January 07, 2014, 16:25:34 UTC »
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...
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Offline joeyb747

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Re: Heavy Jet Reverse Thrust Action on a Wet Runway
« Reply #3 on: January 07, 2014, 16:30:21 UTC »
That is a great size comparison. I've seen an AN225 up close only one time...talk about MASSIVE!!  :-o 8-)
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Offline RonR

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Re: Heavy Jet Reverse Thrust Action on a Wet Runway
« Reply #4 on: January 07, 2014, 16:44:11 UTC »
Yeah, looks like you could fit an aircraft carrier in that monster  :-)
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Offline ORD Don

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Re: Heavy Jet Reverse Thrust Action on a Wet Runway
« Reply #5 on: January 07, 2014, 19:50:27 UTC »





                  Very cool video !!        Thanks for the post....
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Offline Marty Becker

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Re: Heavy Jet Reverse Thrust Action on a Wet Runway
« Reply #6 on: January 11, 2014, 03:13:09 UTC »
Quote from: joeyb747 on January 07, 2014, 16:14:20 UTC
...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
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