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A rudder of 25 degrees travel needs 20 degrees for engine failure and 8 for crosswind. These demands

  • A.Cannot both be met simultaneously at full travel
  • B.Can both be met with 3 degrees to spare
  • C.Sum to exactly the travel available
  • D.Are unrelated to the travel available

Answer: A

The two requirements total 28 degrees against 25 available, so they cannot be combined at full value. Certification examines the critical combination rather than each case in isolation, which is what makes rudder sizing so demanding.

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