M/A climb 2

15.10.2007

Submission:

I believe the 2.1% is based on a certification requirement. Following is the USA transport category certification requirements for a single engine climb (M/A) following an approach.
14 CFR Part 25.121 Climb: One-engine-inoperative. (d) Approach. In a configuration corresponding to the normal all-engines-operating procedure in which VSR for this configuration does not exceed 110 percent of the VSR for the related all-engines-operating landing configuration, the steady gradient of climb may not be less than 2.1 percent for two-engine airplanes, 2.4 percent for three-engine airplanes, and 2.7 percent for four engine airplanes, with (1) The critical engine inoperative, the remaining engines at the go-around power or thrust setting; (2) The maximum landing weight; (3) A climb speed established in connection with normal landing procedures, but not more than 1.4 VSR; and (4) Landing gear retracted.
Mark Cato, ALPA, USA