dragon-wings
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Only 2 Reversers On The A380?

Fri Apr 15, 2005 2:37 pm


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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
 
DLKAPA
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RE: Only 2 Reversers On The A380?

Fri Apr 15, 2005 2:43 pm

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?
And all at once the crowd begins to sing: Sometimes the hardest thing and the right thing are the same
 
dragon-wings
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RE: Only 2 Reversers On The A380?

Fri Apr 15, 2005 2:49 pm

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
 
RIGS
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RE: Only 2 Reversers On The A380?

Fri Apr 15, 2005 3:18 pm

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.
 
Lemurs
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RE: Only 2 Reversers On The A380?

Fri Apr 15, 2005 3:22 pm

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.
 
DLKAPA
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RE: Only 2 Reversers On The A380?

Fri Apr 15, 2005 3:30 pm

But doesn't the lack of reversers mean that they now have to build two engine subtypes?
And all at once the crowd begins to sing: Sometimes the hardest thing and the right thing are the same
 
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HAWK21M
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RE: Only 2 Reversers On The A380?

Fri Apr 15, 2005 4:17 pm

Whats the MEL requirements with INOP T/R on one side in this senario.
regds
MEL
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RayChuang
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RE: Only 2 Reversers On The A380?

Fri Apr 15, 2005 11:15 pm

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.
 
JGPH1A
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RE: Only 2 Reversers On The A380?

Fri Apr 15, 2005 11:20 pm

Isn't the same true for the A340 ? I seem to recall reading that somewhere.
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Lemurs
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RE: Only 2 Reversers On The A380?

Sat Apr 16, 2005 12:08 am

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.
 
air2gxs
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RE: Only 2 Reversers On The A380?

Sat Apr 16, 2005 3:13 am

Most reverser components are installed on the cowls (normally) with a few control parts on the engine itself.
 
jorge1812
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RE: Only 2 Reversers On The A380?

Sat Apr 16, 2005 3:33 am

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.
 
JBirdAV8r
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RE: Only 2 Reversers On The A380?

Sat Apr 16, 2005 10:26 am

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
 
FrequentFlyKid
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RE: Only 2 Reversers On The A380?

Sat Apr 16, 2005 10:55 am

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...
 
SPREE34
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RE: Only 2 Reversers On The A380?

Sat Apr 16, 2005 10:57 am

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.
 
CORULEZ05
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RE: Only 2 Reversers On The A380?

Sat Apr 16, 2005 11:02 am

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.
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FrequentFlyKid
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RE: Only 2 Reversers On The A380?

Sun Apr 17, 2005 2:04 am

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
 
stirling
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RE: Only 2 Reversers On The A380?

Sun Apr 17, 2005 2:52 am

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
 
lmml 14/32
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RE: Only 2 Reversers On The A380?

Sun Apr 17, 2005 4:40 am

Now that the B52 has been mentioned, I always wondered why Tornado's have reversers.
 
Alessandro
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RE: Only 2 Reversers On The A380?

Sun Apr 17, 2005 5:25 am

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....
From New Yorqatar to Califarbia...
 
FedEx
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RE: Only 2 Reversers On The A380?

Sun Apr 17, 2005 7:03 am

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.
 
bond007
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RE: Only 2 Reversers On The A380?

Sun Apr 17, 2005 7:16 am

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!
 
gerardo
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RE: Only 2 Reversers On The A380?

Sun Apr 17, 2005 7:51 am

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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