Woodreau wrote:One of the one things that stand out from a pilot's perspective is engine out performance. Both Part 23 and part 25 aircraft are required to publish a performance number in the event of an engine failure.
Under Part 23 the engine out performance after takeoff is not required to be a positive climb (i.e it can be negative into the ground where the remaining engine merely takes you to the crash site.) Under Part 25 the engine out performance is required to be net positive during the first, second, third segment climb. So the aircraft is required to be able to still fly with an engine failure after takeoff.
Just one item as an example as a difference between Part 23 and Part 25 certification.
6,000 pounds or less maximum certificated takeoff weight and Vso 61 knots or less:
The single engine rate of climb or climb gradient at 5,000 MSL must simply be determined. The rate of climb could be a negative number. There is no requirement for a positive single engine rate of climb at 5,000 feet or any other altitude.
Rate of climb is the altitude gain per unit of time, while climb gradient is the actual measure of altitude gained per 100 feet of horizontal travel, expressed as a percentage. An altitude gain of 1.5 feet per 100 feet of horizontal travel is a climb gradient of 1.5 percent.
With regard to climb performance, the light twin with one engine inoperative will perform marginally at best, and may not be capable of climbing at all under existing conditions. There is no requirement that a light twin in the takeoff or landing configuration be able to maintain altitude, even at sea level, with one engine inoperative.
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