Definition
QNE is the altimeter setting of 29.92 inches of mercury (1013.2 hectopascals), used at and above the transition altitude so that all aircraft operating at high altitude reference the same standard pressure datum. When QNE is set, the altimeter displays pressure altitude, which is reported as a flight level (e.g., FL350 = 35,000 feet at 29.92).
Plain English
QNE means setting your altimeter to the standard pressure value of 29.92 so that every aircraft up high is measuring altitude against the same reference. The number on your altimeter then becomes a flight level rather than a true height above sea level.
Context Anchor
Seen in altimeter-setting procedures, especially when aircraft are assigned high-altitude levels based on standard pressure rather than local airport pressure.
Derivation
QNE is one of the ICAO Q-codes, a system of three-letter codes starting with Q that originated in early radio communication for sending standard messages quickly. The Q-codes for altimeter settings (QNE, QNH, QFE) have stuck around in aviation even though their original telegraph use is long gone.
Why Pilots Care
Using the same QNE value above the transition altitude guarantees consistent pressure-altitude reporting and safe vertical separation between aircraft.
Intuition Check
QNE is not a local weather pressure setting. It is the fixed standard setting: 29.92 inches of mercury, or 1013.2 hectopascals.
Example Sentence 1
Climbing through the transition altitude, the pilot set QNE and reported reaching FL240.
Example Sentence 2
Flight planning software automatically applies QNE when calculating performance numbers in the flight levels.