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When any aircraft passes the critical Mach of that particular airframe, the centre of pressure shifts ________

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When any aircraft passes the critical Mach of that particular airframe, the centre of pressure shifts ________

(a) Rightwards

(b) Leftwards

(c) Rearwards

(d) Frontwards

This question was posed to me in a job interview.

This intriguing question comes from Aircraft Systems and Aviation topic in portion Aircraft Systems and Aviation Overview of Aircraft Maintenance

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The correct choice is (c) Rearwards

To explain I would say: The centre of pressure shifts rearwards when any aircraft passes the critical Mach of that particular airframe. This phenomenon causes a pitch down moment on the aircraft, if the centre of gravity still remains where it was.

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