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Only 2 Reversers On The A380?  
User currently offlineDragon-wings From United States of America, joined Apr 2001, 3986 posts, RR: 0
Posted (9 years 5 months 1 week 5 days 4 hours ago) and read 6416 times:


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Photo © French Frogs AirSlides



Remark on the photo says: Low speed rolling with reverses (only 2 reverses on 380)

Am I reading this right? There are only 2 reversers on the A380? If I am reading this right will the A380 be able to stop when coming in for a landing with only 2 reversers??


Don't give up don't ever give up - Jim Valvano
22 replies: All unread, jump to last
 
User currently offlineDLKAPA From , joined Dec 1969, posts, RR:
Reply 1, posted (9 years 5 months 1 week 5 days 4 hours ago) and read 6389 times:

I thought each engine had it's own reverser. They'd have to make half the engines with reversers and half without if this was really the case, maybe they're just testing those two?

Of course I'm just talking out my ass, maybe they really did only plan for 2 reversers?


User currently offlineDragon-wings From United States of America, joined Apr 2001, 3986 posts, RR: 0
Reply 2, posted (9 years 5 months 1 week 5 days 4 hours ago) and read 6361 times:

Quoting DLKAPA (Reply 1):
Of course I'm just talking out my ass, maybe they really did only plan for 2 reversers?

Then that is a whole lot of plane to be stopping on just the breaks and 2 reversers. If they did plan it like that.



Don't give up don't ever give up - Jim Valvano
User currently offlineRIGS From South Africa, joined Oct 2003, 8 posts, RR: 0
Reply 3, posted (9 years 5 months 1 week 5 days 3 hours ago) and read 6279 times:

You guys must remember that they are testing every thing on this aircraft, and that they have a procedure to follow and that includes testing reverser's in stages, Boeing will do the same with any new aircraft.
WOW will have use all four reverser thrusters, it common sense.


User currently offlineLemurs From United States of America, joined Mar 2005, 1439 posts, RR: 4
Reply 4, posted (9 years 5 months 1 week 5 days 3 hours ago) and read 6265 times:

Friendly suggestion: Do some searches with the site tool. All of this has been discussed very recently. Quick summary:

There are only two revesers.
They're only on the inboard engines.
The outboards are without because of risk of FOD and weight savings.
Reversers are never factored into landing and breaking numbers when operating aircraft.



There are 10 kinds of people in the world; those who understand binary, and those that don't.
User currently offlineDLKAPA From , joined Dec 1969, posts, RR:
Reply 5, posted (9 years 5 months 1 week 5 days 3 hours ago) and read 6239 times:

But doesn't the lack of reversers mean that they now have to build two engine subtypes?

User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 6, posted (9 years 5 months 1 week 5 days 2 hours ago) and read 6161 times:

Whats the MEL requirements with INOP T/R on one side in this senario.
regds
MEL



Think of the brighter side!
User currently offlineRayChuang From United States of America, joined Jun 2000, 8018 posts, RR: 5
Reply 7, posted (9 years 5 months 1 week 4 days 19 hours ago) and read 5775 times:

I think per FAA and European JAA certification requirements, they will require that the A380-800 be able to land and stop in a reasonable distance on a dry runway without thrust reversers, the same rule that applies to other widebody jets. Now you know why modern widebody jets have such big wing spoilers, which actually do a very good job slowing down the plane after touchdown. Thrust reversers are a good idea, though, mostly for slowing down the plane after touchdown on wet or snowy runways and also as a way to slow the plane down fast enough so they get off the main runway quicker.

User currently offlineJGPH1A From , joined Dec 1969, posts, RR:
Reply 8, posted (9 years 5 months 1 week 4 days 19 hours ago) and read 5760 times:

Isn't the same true for the A340 ? I seem to recall reading that somewhere.

User currently offlineLemurs From United States of America, joined Mar 2005, 1439 posts, RR: 4
Reply 9, posted (9 years 5 months 1 week 4 days 18 hours ago) and read 5656 times:

Quoting DLKAPA (Reply 5):
But doesn't the lack of reversers mean that they now have to build two engine subtypes?

Two cowlings, but not two engine types. One engine, that can either have reverses installed, or not.



There are 10 kinds of people in the world; those who understand binary, and those that don't.
User currently offlineAir2gxs From , joined Dec 1969, posts, RR:
Reply 10, posted (9 years 5 months 1 week 4 days 15 hours ago) and read 5458 times:

Most reverser components are installed on the cowls (normally) with a few control parts on the engine itself.

User currently offlineJorge1812 From Germany, joined Apr 2004, 3149 posts, RR: 8
Reply 11, posted (9 years 5 months 1 week 4 days 15 hours ago) and read 5399 times:

Quoting Lemurs (Reply 4):
Friendly suggestion: Do some searches with the site tool. All of this has been discussed very recently. Quick summary:

There are only two revesers.
They're only on the inboard engines.
The outboards are without because of risk of FOD and weight savings.
Reversers are never factored into landing and breaking numbers when operating aircraft.

Exactly what i thought. when I saw the pic I wanted to start the same topic, but had a look in the Tech/Operation Forum and cleared the answer by myself. But still expected to see this topic here in Civil Aviation.

Georg.


User currently offlineJBirdAV8r From United States of America, joined Jun 2001, 4491 posts, RR: 21
Reply 12, posted (9 years 5 months 1 week 4 days 8 hours ago) and read 3294 times:

I've seen it more than a few times on 747's to use inboard reversers only, if that puts anything into perspective..


I got my head checked--by a jumbo jet
User currently offlineFrequentflykid From United States of America, joined Nov 2001, 1206 posts, RR: 1
Reply 13, posted (9 years 5 months 1 week 4 days 8 hours ago) and read 3161 times:

Quote:
If I am reading this right will the A380 be able to stop when coming in for a landing with only 2 reversers??

Besides the fact that reversers have zero to do with the braking capability do you really think they would design and build this aircraft with it being able to stop? I mean I understand what you're asking, but come on...


User currently offlineSPREE34 From United States of America, joined Jun 2004, 2248 posts, RR: 9
Reply 14, posted (9 years 5 months 1 week 4 days 8 hours ago) and read 3148 times:

This will not be the only multi engine aircraft to not have reversers on all engines. Falcon 50 comes to mind. The "Super27" conversions done on 727s used only the number 1 and 3 for reverse. To this day many large aircraft still have no reverse function. Examples- B52, some C-135s, even the 135s that were re-engined with the CFM56 did not get reversers.


I don't understand everything I don't know about this.
User currently offlineCORULEZ05 From , joined Dec 1969, posts, RR:
Reply 15, posted (9 years 5 months 1 week 4 days 8 hours ago) and read 3126 times:

I am sure that which ever the case may be, 4 reversers or 2. Airbus engineers thought this out and are sure it will work.

Quoting Frequentflykid (Reply 13):
do you really think they would design and build this aircraft with it being able to stop? I mean I understand what you're asking, but come on...

Exactly my point

I love it when some airliners members think they know more than Airbus or Boeing engineers and actually question decisions they make.


User currently offlineFrequentflykid From United States of America, joined Nov 2001, 1206 posts, RR: 1
Reply 16, posted (9 years 5 months 1 week 3 days 16 hours ago) and read 2298 times:

Well it's not that they think they know more than the engineers, it's that is just a plain dumb question. Some people get all uptight on this board when someone questions another persons post, but seriously, that's beyond a dumb question. I've asked my share on boneheaded questions, so we have all been there.

I can see it now:

Dear A-Netter, Thank you so much for informing us that we designed a mutlimillion dollar airplane but didn't realize it couldn't come to a safe stop upon landing. You have no doubt saved countless lives...and Airbus. Thank you! Signed, Airbus Industrie


User currently offlineStirling From Italy, joined Jun 2004, 3943 posts, RR: 21
Reply 17, posted (9 years 5 months 1 week 3 days 16 hours ago) and read 2246 times:

Quoting SPREE34 (Reply 14):
To this day many large aircraft still have no reverse function. Examples- B52,

Actually it does, it's called a parachute.



Delete this User
User currently offlineLMML 14/32 From Malta, joined Jan 2001, 2565 posts, RR: 6
Reply 18, posted (9 years 5 months 1 week 3 days 14 hours ago) and read 2185 times:

Now that the B52 has been mentioned, I always wondered why Tornado's have reversers.

User currently offlineAlessandro From , joined Dec 1969, posts, RR:
Reply 19, posted (9 years 5 months 1 week 3 days 13 hours ago) and read 2132 times:

I think the last commercial plane with drag-chutes are older versions of Tu-134 and the Caravelle.
A plane with only 2 of 4 engines that do the reverse is the IL-62....


User currently offlineFedex From , joined Dec 1969, posts, RR:
Reply 20, posted (9 years 5 months 1 week 3 days 12 hours ago) and read 2053 times:

What we were told by Airbus, is that originally they were not going to put t/r's on the aircraft at all due to the fact that the multiple brakes were more than enough for stopping on any forseen scenario. The addition of t/r's on the inboard engines evolved from the request of the pilots group during discussion sessions.

One thing that I have been totally impressed with during this entire A380 program up to date is the way that Airbus has bent over backwards to listen to every idea and concearn that has arisen during the development phase. they have asked each workgroup that has ANYTHING to do with this aircraft for their suggestions and comments.

Working on McD, Airbus, and Boeing products daily, I can honestly say that they each have their high pionts and low points. I am not an A or B man. In my opinion there is not one any better that the rest, just different. With that being said, from what I have been shown and seen on the A380, there may a change in my opinion.


User currently offlineBond007 From United States of America, joined Mar 2005, 5417 posts, RR: 8
Reply 21, posted (9 years 5 months 1 week 3 days 11 hours ago) and read 2033 times:

I don't know any figures, but as others have stated, reverse thrust is really an 'extra' form of braking anyway.

The actual effect it has on braking is not proportional to the amount of noise it makes, or the number of local residents it annoys  

It might save the brakes some, and help in slippery conditions, but the plane has gotta be able to land without them. Many airports have nightime restrictions on their use also.

Rgds,

Jimbo

[Edited 2005-04-17 00:17:03]


I'd rather be on the ground wishing I was in the air, than in the air wishing I was on the ground!
User currently offlineGerardo From Spain, joined May 2000, 3481 posts, RR: 30
Reply 22, posted (9 years 5 months 1 week 3 days 11 hours ago) and read 1993 times:

Quoting JGPH1A (Reply 8):
Isn't the same true for the A340 ? I seem to recall reading that somewhere.

Nope! As seen here:
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Photo © Gerardo Dominguez



Gerardo



dominguez(dash)online(dot)ch ... Pushing the limits of my equipment
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