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单选题
THE POWER TRANSFER UNIT (PTU) IS AUTOMATICALLY TESTED:
A
During the second engine start.
B
When the Power Transfer (PTU) P/B is latched in the "OFF" position.
C
During first engine start when the parking brake is selected "ON".
答案解析
正确答案：A
解析：
题目解析
THE POWER TRANSFER UNIT (PTU) IS AUTOMATICALLY TESTED: A. During the second engine start. B. When the Power Transfer (PTU) P/B is latched in the "OFF" position. C. During the first engine start when the parking brake is selected "ON". 答案:A
解析：动力转换组件(PTU)在第二次启动发动机时会自动进行测试。选项A是正确答案。这意味着在飞机的第二次发动机启动时，PTU会自动进行测试以确保其正常工作。
