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Spoilers Vs. Airbrakes  
User currently offlineVivek1979 From United States of America, joined May 2002, 50 posts, RR: 0
Posted (14 years 3 days 20 hours ago) and read 4024 times:

Aren't they same thing? Or are they different on bigger planes.

10 replies: All unread, jump to last
User currently offlineFredT From United Kingdom, joined Feb 2002, 2185 posts, RR: 26
Reply 1, posted (14 years 3 days 12 hours ago) and read 3961 times:

They're not always the same, no. Check the airbrakes on an F-28. They're very clearly not spoilers...


I thought I was doing good trying to avoid those airport hotels... and look at me now.
User currently offlineFokker Lover From , joined Dec 1969, posts, RR:
Reply 2, posted (14 years 2 days 22 hours ago) and read 3919 times:

On F28's and F100's the spoilers are called lift dumpers. There are 5 on each wing and they can only be deployed on the ground. The speed brakes are two large barn doors that are mounted where the tail cone should be. When they are open there is a span of twelve feet from tip to tip. Speed brakes are used in flight and they work very well. On an F28 the control lever is about a foot long (on the captains side of the center pedestal) and the pilot can control how far he wants to open them. On an F100 the lever is about 3 inches and the speed brakes are either open or closed. There is no in between. Man, I love talking about Fokkers. I think it's some kind of sickness.......

User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 3, posted (14 years 2 days 15 hours ago) and read 3893 times:

For most A/C out there, Spoilers ARE speedbrakes in many cases, but it depends upon the A/C...and/or whether the A/C is in flight or on the ground...and/or if the spoilers are used for roll control or true "speedbrakes". Often, a distinction must be made between 'Flight Spoilers' and 'Ground Spoilers', even if flight spoilers are deployed on the ground. A "one size fits all" answer is difficult in this ( and most other systems ) questions on commercial airliners. -- As 'Fokkerlover' ( and 'FredT' ) pointed out, Fokker jets do not combine the two functions in one set of flight controls.

User currently offlineBroke From United States of America, joined Apr 2002, 1325 posts, RR: 3
Reply 4, posted (14 years 2 days 11 hours ago) and read 3880 times:

Boeing jets pretty much use spoilers for three different things. First, as part of the flight control system in conjunction with the ailerons to roll the airplane (you'll will see the outboard spoilers go up on the wing that is going down); second, as speed brakes (usually used when you want to descend quickly, can also be used if ATC gives the crew a significant speed reduction, outboard spoilers only); third, to decrease lift when landing (used only after the airplane is on the ground, all spoilers).
The DC-8 only uses spoilers on the ground to reduce lift. In flight, it can use the inboard thrust reversers to slow or descend. The DC-9/MD-80 family uses spoilers in a similar manner as the Boeing jets.
I believe that the A-300/A-310 family also uses spoilers similar to the Boeing jets.
I believe the BAE 146 has a speed brake similar to the Fokker's, but I don't know about it's spoiler system.

User currently offlineSailorOrion From Germany, joined Feb 2001, 2058 posts, RR: 5
Reply 5, posted (14 years 2 days 9 hours ago) and read 3869 times:

Broke is right about the BAE146:

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Click here for bigger photo!

Photo © Daniel Werner

you can clearly see the deployed spoilers (lift dumpers) on the wing, and the speedbrakes at the tail.


User currently offlineVivek1979 From United States of America, joined May 2002, 50 posts, RR: 0
Reply 6, posted (14 years 1 day 7 hours ago) and read 3821 times:

Thank you all for your input.

User currently offlineMagicMan_841 From Canada, joined Jan 2002, 182 posts, RR: 0
Reply 7, posted (14 years 4 hours ago) and read 3777 times:

usually, Airbrakes are there to make drag and slow the airplane so they dont have to reduce power while descending, which prevents icing problems. Spoiers are lift-killers, used mainly on the landing roll. They slow down the airplane and make it "stick to the ground" more.

Hope this helps
Magic  Yeah sure

User currently offlineSonic99 From , joined Dec 1969, posts, RR:
Reply 8, posted (13 years 12 months 2 days 5 hours ago) and read 3743 times:

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Click here for bigger photo!

Photo © Stephan Curkowskyj

Spoilers, flaps, airbrakes.


User currently offlineSllevin From United States of America, joined Jan 2002, 3376 posts, RR: 5
Reply 9, posted (13 years 12 months 2 days 3 hours ago) and read 3723 times:

Speedbrakes are devices like on the Fokker that only create drag by extending into the airstream.

Spoilers cause a wing to dump lift, therefor requiring a greater AOA for the same amount of lift, thereby creating drag. But they are also used, as mentioned for things like roll control.

I didn't realize that F100's had TR's -- on my two flights in them TR's weren't used.


User currently offlineFokker Lover From , joined Dec 1969, posts, RR:
Reply 10, posted (13 years 12 months 1 day 7 hours ago) and read 3697 times:

In your picture I see.... Lift dumpers deployed, flaps at 42 degrees, thrust reversers deployed, and speed brake closed. I also noticed that the "band aid" repair above the emergency exits has not been installed yet. The the thrust reverser mod to lengthen the finger stops has been completed, and the red beacon is installed on top of the vertical stab (panel 339AT) The USAir beacons are installed on the top of the mid fuselage. The T/R's were causing too much wear and tear on the tail so longer fingers were installed to prevent them from fully deploying. Eventually USAir changed policy when deploying the buckets power could only be pulled during an emergency stop. They could still open the buckets during landing but only at idle. I don't know if AA still powers back from the gate, but they were causing more damage than we were.

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