Discussion
Statement I: Second segment climb frequently sizes the engines of a twin.
Statement II: The gradient must be achieved on the remaining engine after a failure at takeoff.
In the light of the above statements, choose the correct answer.
Answer: D
Correct answer: Both Statement I and Statement II are correct
Both statements are correct and the second explains the first. Certification requires a minimum second segment gradient - 2.4 per cent for a twin - to be achieved after the critical engine has failed at takeoff, so the remaining engine alone must supply both the drag and the gradient.
For a twin that means installing roughly twice the required \( T/W \), since half of it is lost with the failed engine. That doubling frequently makes second segment climb the binding constraint, so a twin often carries more thrust in normal operation than its cruise or takeoff performance alone would need.
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