What’s “Screen Height”?
Screen Height is the height of an imaginary screen which the aeroplane would just clear when taking off or landing in an unbanked attitude with landing gear extended.
– According to HK CAD 385 – Appendix 2 (Definitions)
Information from unofficial material, “screen height” relates to the minimum height achieved over the runway before the end of the clearway should an engine failure occur on takeoff. The screen height also marks the end of the takeoff distance.
If you have heard V1, Vr, V2 as well as screen height, then you may ask an interesting question – whether the screen height should be 35 feet or 50 feet?
Whether the screen height is 35 feet or 50 feet?
3.6 (1) The take-off distance shall be established and shall be the distance required to reach a screen height of 50 feet from a standing start, with:
(a) engine(s) operating within take-off power limitations; and
(b) wing flaps in the take-off position; and
(c) the aeroplane reaching the screen height at a take-off safety
speed not less than 1.2 VS1.
Indeed, according to CASA Civil Aviation Amendment Order (No. R92) 2004 – CAO 101.28 , “screen height” is also used in landing phase:
(1) The landing distance shall be established and shall be the distance required to land and come to a full stop from a screen height of 50 feet above the landing surface, with:
(a) wing flaps in the landing position; and
(b) the aeroplane reaching the screen height at an approach speed of not less than 1.3 VSO.
In Australia, there are two more provisions related to screen height
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