Speed brakes:
- Are aerodynamic surfaces identical to trailing edge flaps that increase both lift and drag simultaneously during the approach phase
- Are deployed to increase the maximum lift coefficient of the wing, allowing lower approach and landing speeds
- Are devices that increase drag to reduce airspeed or increase descent rate without significantly affecting lift
Explanation from PART66Online
Speed brakes are surfaces deployed to add drag so the aircraft can slow down or steepen its descent without a large change in lift. They are not high-lift devices like flaps and do not raise the maximum lift coefficient - their purpose is drag, not lift.
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wan.yc.justin asked · 13h ago
I fail to understand the different between speed brakes and spoilers. Even if i looked into google the photos basically identifies the spoiler parts as speed brakes as well.
Community Comments (1)
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Lisa_T
2h ago
Yeah this one's tricky, the photos label them the same because on most airliners the same upper wing panels do both jobs. Answer is C, a speed brake is deployed to add drag so you slow down or descend steeper, whereas a spoiler's job is to kill the lift the wing is making, which is what those panels do when they go fully up on landing. Think of an umbrella, holding it open into the wind is the speed brake slowing you down, and folding it shut is the spoiler taking away what was holding it up. That's how I'd read it.
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