Single engine ops on a multi

There are two things that I think is important when it comes to a making a decision to either land (even on the grass part next to the runway) or perform a single engine go around. Aircraft type/performance, and your "go, no-go decision altitude" based on the normal altitude loss that happens during flap/gear retraction and transition to Vyse with terrain in mind. Bellow this altitude I would commit myself to land.
As stated only twins above 6000 lbs/ stall 61 CAS are required to show a positive single engine climb capability flying in clean configuration at 5000 ft with the prop feathered. The formula is ROC = 0.027 (Vso)2. Also I have heard that FAA does not require any sustained climb rate unless you can carry 10 or more passengers.

Example: A Cessna 310 (under 6000 lbs but stall at 64) only has to show 119 fpm for part 23

The Aztec does not even have to show a positive rate since it is less than 6000 lbs and stalls at something like 60 CAS. BTW, it has a 50FPM climb rate.
 
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