How to know if you can make required climb gradient?

[Zeffy]

g450cpt

I really can't believe...

Let's begin by examining some authoritative references.

By all means, feel free to cite your own.

FAA AIM 5-2-8:



FAA AC 120-91:




The AC is quite clear -- Thus, one-engine-inoperative obstacle clearance requirements and the all-engines-operating TERPS requirements are independent, and one- engine-inoperative procedures do not need to meet TERPS requirements.


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Without a performance engineering analysis, how would you determine the maximum allowable takeoff weight for your G450 (if that is indeed your current ride) at KLAS:



350'/nm to 11,000 MSL.

Per the AC, "...any gradient requirement, specified or unspecified, will be treated as a plane which must not be penetrated from above until reaching the stated height, rather than as a gradient which must be exceeded at all points in the path."

If you are going to insist that it's necessary to fly the COWBY4 with OEI -- and without using a performance engineering analysis:

1. How would you calculate the correct acceleration height and know with certainty that the airplane would not penetrate the plane from above?
   
   
2. How would you propose to comply with time limits on takeoff thrust?