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What is meant by pressure altitude?

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What is meant by pressure altitude?

(a) It is the indicated altitude measured with respect to appropriate datum pressure setting

(b) It is the indicated altitude measured with respect to appropriate gauge  pressure setting

(c) It is the indicated altitude measured with respect to appropriate static pressure setting

(d) It is the indicated altitude measured with respect to appropriate vacuum pressure setting

I got this question in final exam.

Enquiry is from Measurement of Height topic in division Atmosphere and Air Data Measurement of Aircraft Performance

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The correct answer is (a) It is the indicated altitude measured with respect to appropriate datum pressure setting

To elaborate: Pressure altitude it is the indicated altitude measured with respect to appropriate datum pressure setting. It is corrected for static pressure error. This error is caused due to the static source being located within the disturbed pressure field caused due to presence of aircraft.

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