Moderators: richierich, ua900, PanAm_DC10, hOMSaR

 
WorldTraveller
Topic Author
Posts: 594
Joined: Sun Jun 06, 1999 3:47 am

A340 Thrust Reversers

Sat Mar 10, 2001 7:18 pm

Hello everybody!

I've got a question concerning the thrust reversers of the A340.

I think I read that the "newer" versions of the A340-300 only have trust reversers on engines no.2 and no.3.
This picture would support this thesis:


Click for large version
Click here for full size photo!

Photo © Simone Kuemer


A340-313X with 2 thrust reversers deployed


Click for large version
Click here for full size photo!

Photo © Rajesh Changela


"older" A340-300 with 4 thrust reversers (great shot BTW!!)

However, this "new" A340-313X also has 4 thrust reversers:


Click for large version
Click here for full size photo!

Photo © Darcy Stevens



And finally an A340 with thrust reversers deployed on engines no.3 and no.4 only!?


Click for large version
Click here for full size photo!

Photo © Matthew Lee



Could anyone please enlighten me?

Is it up to the airline customer to choose 2 or 4 thrust reversers or can each thrust reverser be deployed as the crew wishes it (like no.1 and no.4 or no.2 and no.4 etc.)?

Any help appreciated!

Best regards
the WorldTraveller
 
VC-10
Posts: 3552
Joined: Tue Oct 26, 1999 11:34 am

RE: A340 Thrust Reversers

Sat Mar 10, 2001 8:25 pm

The a/c will not allow in assymetrical deployment of the Otbd eng reversers. I cannot explain the AC picture however, other than the LH engines have just had the reversers stowed.
 
TK
Posts: 222
Joined: Tue Oct 31, 2000 11:41 am

RE: A340 Thrust Reversers

Sat Mar 10, 2001 10:53 pm

I think I've read somewhere that deployment of number 1 and 4 reversers are inhibited until the main landing gears are fully compressed. That explains the first picture, but I'm puzzled by the AC one!
 
A/c train
Posts: 674
Joined: Sun Jun 10, 2001 7:57 am

RE: A340 Thrust Reversers

Tue Mar 13, 2001 12:12 am

Correct me if im wrong as I am on the site to learn from the experts.
Sometimes a/c used full reverse thrust if landing is overshot or there is a high speed landing . The pilot needs to select appropriate engines to use reverse thrust as in one on each wing or all of them as you get asymmetric loading on one side . Pilots rarely use full reverse as this causes engine vibration and will reduce engine life.
 
User avatar
c172akula
Posts: 826
Joined: Tue Mar 13, 2001 1:53 pm

RE: A340 Thrust Reversers

Wed Mar 14, 2001 8:27 am

I know this is a late response, but in the AC picture the #1 Thrust reversers are just barely visible, maybe because of the angel of the shot the #3 and 4 reversers are more prominent, and the hazy weather also plays with the ability to see clearly. But take a look and the #1 Engine, you can make out the thrust reverser, probably closing.
 
WorldTraveller
Topic Author
Posts: 594
Joined: Sun Jun 06, 1999 3:47 am

RE: A340 Thrust Reversers

Wed Mar 14, 2001 4:33 pm

I get your point C172Akula, but I think all thrust reversers should close at the same time, shouldn't they?

Anyone with more info on this?

Is it possibly to deploy thrust reversers one by one, if you wish?

Do the newer A340's only have thrust reversers on engines 2 and 3?

Thank's for the input so far!

Best regards
the WorldTraveller
 
TK
Posts: 222
Joined: Tue Oct 31, 2000 11:41 am

RE: A340 Thrust Reversers

Wed Mar 14, 2001 8:13 pm

Yes, its possible to operate each thrust reverser individually, this is used in engine out conditions when its necessary to apply asymmetric thrust in order to keep the plane straight on the ground.
I strongly doubt the newer A340's having only thrust reversers on numbers 2 and 3. Airbus was considering getting rid of thrust reversers altogether on the series 500 & 600 to save weight though I don't think it materialized.
 
F-WWAI
Posts: 129
Joined: Thu Dec 30, 1999 7:41 am

RE: A340 Thrust Reversers

Thu Mar 15, 2001 12:13 am

All the A340's, old and new, have four thrust reversers.
Current proposal for -> A380 is to have inboard engine thrust reversers only.
A340 has an interlock between thrust reversers of outboard engines which would allow dissymmetric deployment, but would inhibit reverse thrust increase on the deployed T/R engine in case the opposite fellow would not deploy. This is done, obviously, to avoid lateral control problems at low speeds.

hope this clarifies,
 Smile/happy/getting dizzy
FW

Who is online

Users browsing this forum: Jonne1184, PepperTaco and 24 guests

Popular Searches On Airliners.net

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos