Thank you for your answer Michael,
You say that there won’t be substantial performance changes, but there are significant differences between the requirements of the FAR23/CAR 3 normal category and the ones of the FAR23 commuter, and this should affect significantly (limit) the takeoff and landing performances, in my own opinion. Since you’ll be forced to consider the worst case scenario of OEI, you’ll have to provide a accelerate/stop distance (not demanded on normal category nor in SFAR 23), there will be brake energy limits imposed, just to mention some of the requirements not demanded in the previous certifications and that could probably further affect the DHC-6 performances…no?
Best regards