Sponsor Message:
Civil Aviation Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
What Is Sticking Out The Back Of This RJ85?  
User currently offlineJean Leloup From Canada, joined Apr 2001, 2116 posts, RR: 18
Posted (15 years 1 month 2 days 13 hours ago) and read 3346 times:

I'm sure all you guys know this, but I've never noticed it before. AS you can see it comes out from the rear starbord side.. I guess there's one on the other side too. Is it some kind of brake that pops out?

Click for large version
Click here for full size photo!

Photo © Scandpix

Thanks for your reply!

Next flight.... who knows.
11 replies: All unread, jump to last
User currently offlineAA737-823 From United States of America, joined Mar 2000, 6291 posts, RR: 10
Reply 1, posted (15 years 1 month 2 days 13 hours ago) and read 3262 times:

Yes, that is an airbrake. It is used on final approach and landing to.. slow the plane. Avro RJ's don't have thrust reversers, and this acts as a replacement of sorts.


By the way, yes there is also one on the port side.

User currently offlineSamurai 777 From Canada, joined Jan 2000, 2461 posts, RR: 4
Reply 2, posted (15 years 1 month 2 days 13 hours ago) and read 3248 times:

You'll also see the same kind of thing on the Fokker F28! The airbrake opens and closes like a clamshell.

User currently offlineApuneger From Belgium, joined Sep 2000, 3036 posts, RR: 10
Reply 3, posted (15 years 1 month 2 days 9 hours ago) and read 3212 times:

Yes indeed, it's an airbrake, and it consists of 2 parts, one on the port side , and one on the starboard side. These two parts open up, in order to slow the aircraft down. The opening takes only 2 seconds or so.

From what I've seen so far at EBBR (Brussels), pilots landing the RJ usually open up this airbrake only a few moments before touching down. Some pilots only deploy them just after touching down. It all depends on the approach I guess.


Ivan Coninx - Brussels Aviation Photography
User currently offlineHlywdCatft From United States of America, joined Jan 2001, 5321 posts, RR: 6
Reply 4, posted (15 years 1 month 2 days 7 hours ago) and read 3181 times:

Yeah it often depends where the pilot deploys them. I live in Detroit, Northwest/Mesaba fly a ton of them into their Detroit hub and I have noticed that some aren't deployed until they are practically on the ground while some others deploy them several thousand feet up before they even circle in to land over my house which is about 20 miles away from the airport and not in the landing pattern of DTW.

Most of them do their turns around my house though.

Since we are on the subject of RJ85s, what is that strange noise that they make when they circle in to land??? It is something that they do with their engine like changing power or something that makes the strangest eeriest groaning sound.

User currently offlineBlackened From , joined Dec 1969, posts, RR:
Reply 5, posted (15 years 1 month 2 days 7 hours ago) and read 3180 times:

It's true that some Avro RJ pilots open the rear speedbrake long before touching down and some only after. The Avro RJ has also speedbrakes on the wings that are mostly opened after touchdown.
I flew on one of those two weeks ago. I sat behind the engines and it was awfully loud. I noticed that the exhaust of the inboard engines hit the flaps if they're fully deployed. When the engines spool up the flaps start to vibrate and the sound is incredible. It's the same when landing. Maybe the sound you're hearing is when the flaps finally heat the airflow of the engine.

User currently offlineAir Orange From , joined Dec 1969, posts, RR:
Reply 6, posted (15 years 1 month 2 days 6 hours ago) and read 3165 times:

Air brakes!

User currently offlineMirrodie From United States of America, joined Apr 2000, 7459 posts, RR: 60
Reply 7, posted (15 years 1 month 2 days 5 hours ago) and read 3149 times:
Support Airliners.net - become a First Class Member!

Hey, Blackend, perhaps you can advise me. What row did you sit in? I'd like to sit behid the wings and engines too. Thansk for any advice.

Forum moderator 2001-2010; He's a pedantic, pontificating, pretentious bastard, a belligerent old fart, a worthless st
User currently offlineDerekF From United Kingdom, joined Feb 2001, 920 posts, RR: 0
Reply 8, posted (15 years 1 month 1 day 22 hours ago) and read 3109 times:

On the RJ/RJX/146, the airbrakes are the clamshell doors at the rear fuselage. They can be used at any speed. The lift spoilers are for ground use only and are on the top surface of the wings immediately ahead of the flaps. They are deployed automatically on touchdown on the RJ/RJX. The hooting noise is generated when the flaps are deployed from up to the 18deg position and is caused by reverse flow under the wing. It is not dependent on engine RPM but does vary with the speed at which the flaps are deployed. In the landing position the flaps do come close to the jet efflux. If you want a quiet ride I would sit near the front. Also at the back you get the hot jet efflux distorting the air behind the exhaust nozzles.

Hope this clears up a few points.


Derek Ferguson
RJ/RJX Flight Test Engineer

User currently offlineLMML 14/32 From Malta, joined Jan 2001, 2566 posts, RR: 6
Reply 9, posted (15 years 1 month 1 day 22 hours ago) and read 3108 times:

Isn't it awful the sound of the flaps extending? It is even audible from the ground. It is unmistakeable. Like a train coming to a stop at an underground station. The sound was even detected by the DB noise meter during trials ! And yes I noticed the flaps vibrating too. The RJ's with LF505 engines have a lot of problems with them. When Airmalta used to operate four RJ70's we used to have an average of one engine write off a month.

User currently offlineRayChuang From United States of America, joined Jun 2000, 8363 posts, RR: 4
Reply 10, posted (15 years 1 month 1 day 22 hours ago) and read 3092 times:

By the way, one very interesting beneficial side effect of the rear-mounted split airbrake is that they mitigate the effects of a nasty aerodynamic effect called deep stall, where the horizontal stabilizers on a T-tail airplane lose effectiveness at certain angles of attack and the plane literally can fall out of the sky.

Indeed, when Fokker introduced them on the F28 Friendship, it allowed the plane to have much more benelovent stall regimes.

User currently offlineBlackened From , joined Dec 1969, posts, RR:
Reply 11, posted (15 years 1 month 1 day 3 hours ago) and read 3064 times:

I sat in the 2nd last row on a Crossair flight from ZRH to BSL. It was a 20 minutes flight so the sound was no problem. Might be worse on a longer flight. You can really hear it when the flaps are deployed. It's about twice as loud.

Top Of Page
Forum Index

This topic is archived and can not be replied to any more.

Printer friendly format

Similar topics:More similar topics...
What Is Extended From The Back Of This Aircraft? posted Sun Mar 16 2003 18:44:09 by Lacke
What Is This By The Window Of This TU-154? posted Thu Sep 21 2006 06:35:10 by Csavel
What Is On The Nose Of This 757? (Photo) posted Tue Sep 5 2006 16:17:46 by United787
What Is In The Back Of The Headrest? posted Sat Apr 30 2005 17:56:13 by Nycfuturepilot
What Is The Sense Of This RE: AZ posted Sat Jan 8 2005 06:14:26 by TUNisia
What Is The Future Of This Aircraft? posted Mon Oct 6 2003 19:40:52 by Kevin752
What Would Be The Point Of This? posted Fri Nov 10 2006 22:21:14 by Glom
What Are The Odds Of This? posted Fri Jun 2 2006 10:08:35 by PDXflyer31
Ryanair - What's The Point Of This? posted Mon Sep 26 2005 21:24:54 by Drinkstrolley
What's That On The Back Of DL Seats? posted Mon Mar 8 2004 21:48:26 by A340600