Screen height
Moderator
Generally, the defined
(a) end of the declared takeoff distance - point at which the calculated aircraft flight path has climbed to a nominated height - 35ft (heavy aircraft), 50ft (light aircraft). Gets a bit complicated for heavy aircraft in the detail but, if you have an ATPL as your profile indicates, you have had the usual theory training in the various takeoff distance considerations ...
(b) commencement of the declared landing distance - point at which the calculated aircraft flight path passes 50ft height
(a) end of the declared takeoff distance - point at which the calculated aircraft flight path has climbed to a nominated height - 35ft (heavy aircraft), 50ft (light aircraft). Gets a bit complicated for heavy aircraft in the detail but, if you have an ATPL as your profile indicates, you have had the usual theory training in the various takeoff distance considerations ...
(b) commencement of the declared landing distance - point at which the calculated aircraft flight path passes 50ft height
Moderator
Not so ...
(a) for a light aircraft, engine failure is not considered
(b) for a heavy aircraft, the all engines distance is one of the takeoff cases to be considered and, likewise, finishes at the factored distance where screen is achieved.
(a) for a light aircraft, engine failure is not considered
(b) for a heavy aircraft, the all engines distance is one of the takeoff cases to be considered and, likewise, finishes at the factored distance where screen is achieved.
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Was only thinking of heavies.
See what you mean though in regard to the all engine perspective.
I was thinking backwards from the perspective of TODR/TORR, where it must be the longest of...
All eng to V1 - 1 sec, Eng Fail, Continue, reach 35' @V2
or
All eng to V1 - 1 sec, Eng Fail, Abort, Stop
or
All eng to 35' above runway X 1.15
I imagine there are a/c around (do you have an example?) where the most limiting is the 1.15X all engine dist to screen ht (Civil b-52?)
Bow to your wisdom.
See what you mean though in regard to the all engine perspective.
I was thinking backwards from the perspective of TODR/TORR, where it must be the longest of...
All eng to V1 - 1 sec, Eng Fail, Continue, reach 35' @V2
or
All eng to V1 - 1 sec, Eng Fail, Abort, Stop
or
All eng to 35' above runway X 1.15
I imagine there are a/c around (do you have an example?) where the most limiting is the 1.15X all engine dist to screen ht (Civil b-52?)
Bow to your wisdom.
Moderator
Will depend on the individual Type .. however, all engine distance with the factor will tend to be limiting when the OEI performance is comparatively good .. ie low Hp, low OAT, low GW, high V1/VR.
Keep in mind that the limiting case will likely vary throughout the operational envelope.
Keep in mind that the limiting case will likely vary throughout the operational envelope.
Last edited by john_tullamarine; 2nd May 2005 at 21:59.