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Questions tagged [spoilers]

Spoilers are control surfaces which spoil the lift and increase the drag of a wing by disturbing the airflow around it.

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21 votes
2 answers
16k views

When can spoilers be used on airliners?

On airliners, are spoilers used in any part of flight other than landing?
Taher Elhouderi's user avatar
48 votes
2 answers
10k views

Why does one of the Boeing 777's spoilers deploy differently from the rest?

There is one spoiler that isn't totally deployed. Look: Source: Airliners.net And also on this other picture: Source: Airliners.net Why aren't they deployed at the same angle?
user13197's user avatar
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14 votes
2 answers
4k views

Is roll control achieved exclusively with spoilers on an A320 on final approach?

As a private pilot I have zero knowledge about how big jets are being flown so I was a little surprised to see that smaller Airbuses (A32x) only use spoilers for roll control on final approach. ...
Philippe Leybaert's user avatar
7 votes
4 answers
4k views

Why do spoilers seem to be slightly activated during take off?

In this video (minutes from 10:46 to 11:00), the spoilers seem to be slightly deployed during take off. What's the purpose of this? I've already seen this in other videos too. I've also read the ...
Claudi's user avatar
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4 votes
1 answer
2k views

Why do outboard spoilers deploy more than the inboard spoiler on the A320?

I was reading in the FCOM about the speedbrakes and ground spoilers when I came across the below lines. The maximum speedbrake deflection in manual flight is: 40° for spoilers 3 and 4 20° for ...
Jai's user avatar
  • 1,502
11 votes
3 answers
5k views

Why do some aircraft (e.g. Avro RJ85) have rear-mounted air brakes?

I recently saw an Avro RJ100 on approach and I wondered why the Avro RJ100 and also the RJ85 have the air brakes at the rear of the aircraft, and not on top of the wings like most airliners? (...
Pascal's user avatar
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7 votes
1 answer
4k views

Why is deploying speed brakes not recommended with the flaps extended?

I read this in the normal procedures section of the A320 FCOM. Why is it so? When the speed brakes are deployed, extending the flaps beyond FLAPS 1 may induce a slight roll movement, and in calm ...
Jai's user avatar
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20 votes
2 answers
3k views

Why do modern jetliners provide Thrust Reversers at all in their design decisions?

Let's start with the following knowns (please correct me if I am wrong about any): The braking force provided by the wheel brakes is much larger than that by the thrust reversers One is not allowed ...
curious_cat's user avatar
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3 votes
1 answer
549 views

Why is there a difference in the max spoilers extension between the A320 and A321 in a roll?

I was recently reading the Flight Controls chapter in the FCOM and I read that spoilers 2-5 extend a maximum of 35 degrees on the A320 however on the A321 spoilers 2,4 & 5 extend a max of 35 ...
Jai's user avatar
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42 votes
6 answers
17k views

Do airplanes need brakes in the air?

A few days ago I flew on a Boeing 737-900ER. Luckily I was sitting just beside the left wing, seat 26B. I observed that the spoilers were activated (opened) just after the pilot spoke on the Passenger ...
AirCraft Lover's user avatar
17 votes
2 answers
4k views

Do flaps have a maximum speed limit but spoilers don't? Why?

This related question on Aviation SE describes how in most aircraft spoilers (flight spoiler mode not ground spoilers) are deploy-able at any speed But flaps on the other hand mostly have a V_FE above ...
curious_cat's user avatar
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14 votes
1 answer
1k views

Why does spoiler extension cause straight-wing Learjets to pitch down, rather than up, and why did it take so long to discover this?

Straight-wing Learjets (the 23, 24, 25, 35, and 36), the first generation of the popular business-jet series, are (especially when not equipped with any of the many first- and third-party wing ...
Vikki's user avatar
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11 votes
3 answers
1k views

Do aircraft using only spoilerons for roll control, with no conventional ailerons, have a crossover airspeed?

Airplanes generally have a crossover airspeed (a minimum airspeed below which directional control of the airplane cannot be maintained in the event of a rudder hardover). This is because, as airspeed ...
Vikki's user avatar
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10 votes
4 answers
21k views

What are the differences between air brakes, spoilers and lift dumpers?

So many people use these words interchangeably, but after a little searching on Google, I found they are not quite the same thing. All the links I read explain things in a misleading way which pushed ...
Taher Elhouderi's user avatar
10 votes
1 answer
2k views

Why shouldn’t the A330/40’s speedbrakes be used in alternate law?

On page 30 of the ATSB report into the QF72 accident (page 50 of the PDF file of the report), in a table describing the actions required of the flightcrew in response to some of the ECAM messages ...
Vikki's user avatar
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10 votes
1 answer
2k views

Is the location of an aircraft spoiler really that vital?

I was wondering that spoilers in most of the aircraft are always placed aft (towards the tail) the CG location. Why aren't they placed ahead of the wings or near the nose of the aircraft? The same is ...
CuthillMckee's user avatar
4 votes
4 answers
485 views

Could flaps replace spoilers by deflecting more than 90°?

Could flaps replace spoilers by deflecting more than 90° after touchdown?
user avatar
1 vote
0 answers
166 views

Is there any reason spoilers would deploy just after liftoff? [duplicate]

I was watching this video of a 747-8F taking off. http://www.dailymotion.com/video/x273atd Just after liftoff the air brakes and ground spoilers deploy on the left wing causing a sharp roll to the ...
TomMcW's user avatar
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