Discussion
Consider the following statements about altimeter settings:
1. QNH makes the altimeter read height above mean sea level.
2. QFE makes it read zero on the aerodrome.
3. The standard setting gives true altitude above sea level.
Which of the statements given above is or are correct?
Answer: D
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: QNH references mean sea level so the altimeter reads elevation on the ground, and QFE references aerodrome level so it reads zero there. Statement 3 is wrong - the standard setting of 1013.25 gives pressure altitude, which equals true altitude only when the atmosphere happens to be standard. Its purpose is a common reference, not accuracy.
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