A CFR that requires an aircraft structure be capable of supporting 1.5 times limit load factors without failure describes which design concept?

A CFR that requires an aircraft structure be capable of supporting 1.5 times limit load factors without failure describes which design concept?

• A. Factor of Safety
• B. Ultimate Load
• C. Limit Load
• D. Rate of Turn

Answer: (A)

The main idea being tested is how safety margins are expressed in aircraft design. Saying the structure must be able to support 1.5 times the limit load without failure sets a margin of 1.5 over what is expected in normal operation. That margin is the Factor of Safety, which is the ratio of the structure’s strength to the limit load. In other words, the design is built to be 1.5 times as strong as the maximum load anticipated in service. For context, the limit load is the maximum load expected during normal operation, and the ultimate load is 1.5 times that limit load—the load at which failure would occur if the margin were exceeded. The rate of turn is unrelated to this structural load concept.

The main idea being tested is how safety margins are expressed in aircraft design. Saying the structure must be able to support 1.5 times the limit load without failure sets a margin of 1.5 over what is expected in normal operation. That margin is the Factor of Safety, which is the ratio of the structure’s strength to the limit load. In other words, the design is built to be 1.5 times as strong as the maximum load anticipated in service.

For context, the limit load is the maximum load expected during normal operation, and the ultimate load is 1.5 times that limit load—the load at which failure would occur if the margin were exceeded. The rate of turn is unrelated to this structural load concept.