Discussion
Assertion (A): The engine-out case frequently sizes the fin of a twin-engined transport.
Reason (R): The rudder must trim a yawing moment equal to the live engine's thrust times its lateral arm.
Select the correct answer from the options below.
Answer: B
Both are true and the second explains the first. For engines set well outboard the moment runs to hundreds of kilonewton metres, and the side load needed to balance it exceeds anything the fin meets in ordinary flight. It is checked at the critical speed with the aircraft near the ground.
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