Discussion
Altimeter settings and what each reads.
| Setting | Datum | Reads on the aerodrome |
|---|---|---|
| QFE | Aerodrome level | Zero |
| QNH | Mean sea level | Aerodrome elevation |
| QNE at 1013.25 | Standard datum | Pressure altitude |
| QNH on a low pressure day | Mean sea level | Aerodrome elevation |
Why is the standard setting used above the transition altitude?
Answer: C
Correct answer: So that every aircraft shares one common reference
Above the transition altitude every aircraft sets 1013.25 hPa, so all of them are measuring from the same datum and their indicated levels can be compared directly. Vertical separation depends on that consistency, not on accuracy: the standard setting does not give true altitude, and on a day far from standard pressure every aircraft is displaced together, which preserves the separation between them.
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