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I am flying with thomson soon and want to be able to tell what position the flaps are in. How can i figure this out?

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    $\begingroup$ I thought that there was different positions for flaps? e.g. 1,2,3,4 $\endgroup$ – L.Halfpenny Jul 31 '17 at 10:03
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    $\begingroup$ @L.Halfpenny sure, different aircraft number it different though, with different visual effects as well. And to see anything you need to be seated in just the right place or you can't see the flaps at all. $\endgroup$ – jwenting Jul 31 '17 at 11:34
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    $\begingroup$ 1. Launch a flight simulator with a quality addon for the aircraft in question. 2. Set the flaps and remember the appearance in the simulator. 3. Compare with observed visual. $\endgroup$ – kevin Jul 31 '17 at 12:02
  • $\begingroup$ @L.Halfpenny indeed there are, but the difference is usually quite noticeable on most airframes. The common settings are cruise (retracted), takeoff and landing. Slightly less common are variations on those, like climb (a bit less extended that take-off) or short-field landing (on aircraft that sometimes operate on unusually short or improvised airfields) $\endgroup$ – AEhere supports Monica Jul 31 '17 at 12:40
  • $\begingroup$ See also the answers to aviation.stackexchange.com/questions/39634/… $\endgroup$ – AdrianHHH Jul 31 '17 at 13:15
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If you are seated behind the wings, but close, you can usually see black markings (thick line and a number) near the inboard side of the engine pylon which indicate their extension. Some might not be visible when the wing is in cruise configuration.

Same goes for leading edge slats, only you'd need to be seated near the overwing emergency exit to see those.

I've personally seen them on both Airbus and Embraer jets (no recent flights on Boeing airframes so can't confirm if they mark them too).

enter image description here
(Source)

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    $\begingroup$ bombardier doesn't have markings $\endgroup$ – dalearn Jul 31 '17 at 14:22
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    $\begingroup$ I think Embraer has consecutive numbers and not degrees. $\endgroup$ – Martin Argerami Jul 31 '17 at 15:40
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    $\begingroup$ FWIW, I don't recall ever seeing these markings on a Boeing aircraft. $\endgroup$ – reirab Jul 31 '17 at 15:47
  • $\begingroup$ @reirab: Me either. $\endgroup$ – Sean May 6 at 2:55

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