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About spoilers and speed brakes

Alberto asked:

Lito @: A modified approach Rio de Janeiro, 737-200, saw the spoilers being fired, had never seen it in flight. This is a common procedure to reduce speed for landing?

It is a common procedure to use the spoilers in flight (in case you cited is given the name of speedbrakes), but serves to reduce speed for landing (that is a function of flaps).
The photo below shows the speed brakes acting on a Boeing 767 737. The main function of speed brakes is to increase the rate of descent of an aircraft without increasing the speed considerably. And excuse the analogy, it would be like going down a very steep mountain drive with second gear engaged, that is, despite the car being cocked down, walking a safe speed limit which is (of course by plane is different, since the falls may occur with the plane's nose lifted, but the analogy're worth). Another example: Say that an airplane can descend 3000 feet in a minute, but this would reach 270 knots. With speedbrakes raised, he could descend to 5,000 feet per minute with the same speed (totally fictitious numbers to illustrate).

Often, when planning a descent into the airport, the controller of the airspace may require a pilot to cross a fixed (point on route) to 10,000 feet and 250 knots for example. And often, to descend rapidly and reaching this point without extrapolate the speed, the speed brakes are used and probably that's what happened on your flight.

Spoilers Speed Brakes 767

This photo gives to realize that there are boards raised (the flight spoilers or speed brakes) but also has other cards that are not. Those others may be of two types: Ground Spoilers (as the name says only open on landing, the plane already on the ground to destroy the support of the wing and put by weight on the wheels to increase the efficiency of the brakes) and flight spoilers, which help to tilt the wing during turns, thereby reducing the surface of the ailerons maintaining the same efficiency.

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8 Comments to "About spoilers and speed brakes"

  1. And the famous and friendly "Flight Level Change" to save sometimes rapid descent as above ...

    Lito, fleeing a little of the subject, but from what I noticed this image, on the wing, there is one "pipe" used in Fuel jettison system near the ailerons. In Airbus, is located in the structure of Flaps. In Boeing, which I know is the right aileron (wing). This is "optional" for the airline or this 767 does not have this?

    • @ Tully, that wing has not jettison the wing because it is not a 767! haha, already corrected the post. Either type of 767 work just wrong here, this wing is 737.
      Since he asked, in 767 are two "nozzles", one in each wing, are inside the outer aileron. Abs

      • Hahahahaha!

        Doubt informed! And me saying "pipe" ... "nozzles"! Thanks!

        Thanks!

  2. Thanks Lito, his response clarified a doubt the former, by the way I would like to invite you join our group HELIFORTALEZA, dealing with our activities in helimodelismo and model airplanes in the beautiful capital of Ceara, will be an honor to have you with us. The link below:
    http://groups.google.com.br/group/heli-parkside

    • @ Alberto, thanks for the link is saved for me to join when you have a little more time. A hug.

  3. Thank you Lito, you clarified a doubt old

  4. SEN-SA-CIO-NAL

  5. I was wondering if Fortress has programs for airline pilots??

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