Understanding takeoff performance

[FlightPathOBN]

The presentation is to illustrate the difference between what the cert states and surfaces, versus the actual areas and surfaces that are surveyed and taken into account in a procedure design. (ie the difference between the gross/net stepped perf vs the linear perf)

The FAA DEP procedure, and missed approach procedure designs use an all engine linear performance gradient for the obstacle clearance surface, which does not take into account the cert stepped performance EO.

As noted by the FAA, if you are DEP/MA EO, you may not be covered, and cannot rely on the published procedure unless it is specifically noted on the plate.

To follow JT, it is up to the operator, given the real time conditions, for EO DEP/MA, to determine the aircraft performance with procedure design criteria, not the cert criteria.

EDIT: To tell you the truth, one of the best ways to learn is DEP performance is to look at BCOP, the Boeing climb out performance program. This encompases all of the relevant issues such as aircraft performance, weight, altitude, and especially temperatures...