J_T and Mutt
Here is the relavant passage in FAR 121.189 relating to take-off path:
2) In the case of an airplane certificated after September 30, 1958 (SR 422A, 422B), that allows a net takeoff flight path that clears all obstacles either by a height of at least 35 feet vertically, or by at least 200 feet horizontally within the airport boundaries and by at least 300 feet horizontally after passing the boundaries.
(e) In determining maximum weights, minimum distances, and flight paths under paragraphs (a) through (d) of this section, correction must be made for the runway to be used, the elevation of the airport, the effective runway gradient, the ambient temperature and wind component at the time of takeoff, and, if operating limitations exist for the minimum distances required for takeoff from wet runways, the runway surface condition (dry or wet).
Which what
aterpster is referring to. Yes, a ridiculous standard of performance, especially with regards to using 400 feet AFL as a standard acceleration height. BTW, I happen to know him by reputation and reading and, at least, one very good bit of advice via email on MVAs
GF
Firmly resisting any excursions in Vmcg discussions!