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QNH is a Q code. It is a pressure setting used by pilots, air traffic control (ATC) and low frequency weather beacons to refer to the barometric altimeter setting which will cause the altimeter to read altitude above mean sea level within a certain defined region. This region may be fairly widespread, or apply only to the airfield for which the QNH was given. An airfield QNH will cause the altimeter to read field elevation on landing irrespective of the temperature. In the UK the lowest forecast value of QNH for an altimeter setting region is called the "Regional Pressure Setting" and may be used to ensure safe terrain separation when cruising at lower altitudes. In some parts of the world a similar procedure is adopted and this is known as "Regional QNH" however this name has been modified to the above in the UK for reasons of ambiguity. The Q code is a standardized collection of three-letter message encodings, all starting with the letter Q, initially developed for commercial radiotelegraph communication, and later adopted by other radio services, especially amateur radio. ... It has been suggested that Pilot (spaceflight) be merged into this article or section. ... Air Traffic Control Towers (ATCTs) at Schiphol Airport Air Traffic Control (ATC) is a service provided by ground-based controllers who direct aircraft on the ground and in the air. ... This article is being considered for deletion in accordance with Wikipedias deletion policy. ... A weather beacon is a tower which indicates the weather forecast, usually with colored or flashing lights. ... Kollsman-type barometric aircraft altimeter as used in North America An altimeter is an active instrument used to measure the altitude of an object above a fixed level. ... The term above mean sea level (AMSL) refers to the elevation (on the ground) or altitude (in the air) of any object, relative to the average sea level. ...


QNH differs from QFE which refers to the altimeter setting that will cause the altimeter to read the height above a specific aerodrome, and therefore zero on landing. While using QFE is convenient while flying in a traffic circuit of an airfield, the most common procedure when flying "cross country" is to set the altimeter to either the local QNH or the standard pressure setting (1013.2 hPa). When 1013 mbs is set on an altimeter subscale the aircraft's vertical position is referred to as a Flight level instead of an altitude. QFE is a three letter acronym which can have meanings in aviation, in software development, and in internet usage. ... In aviation, a flight level is the nominal altitude of an aircraft referenced to a standard pressure datum, as opposed to the real altitude above mean sea level. ...


Student pilots sometimes remember QNH as "Query Newlyn Harbour". Newlyn Harbour in Cornwall, UK is home to the National Tidal and Sea Level Facility which is a reference for mean sea level. Another way to remember is "Q - Not Here" meaning it refers to the pressure setting that applies away from the airfield. This is to distinguish it from QFE, which novices sometimes confuse. Newlyn Map sources for Newlyn at grid reference SW461284 Newlyn (Cornish: Lulynn) is a town in southwest Cornwall, UK. The town forms a small conurbation with neighbouring Penzance, and part of the civil parish of Penzance. ... Cornish Flag Cornwall (Cornish: Kernow) is a county in South West England on the peninsula that lies to the west of the River Tamar. ... The National Tidal and Sea Level Facility Is responsible for monitoring sea levels in the UK. Data Collected is used To create tidal predictions, monitor climate change and the determination of extreme sea levels for coastal engineering design. ... QFE is a three letter acronym which can have meanings in aviation, in software development, and in internet usage. ...


ATC will pass the QNH to pilots on clearing them to descend below the transition level, as part of air traffic control clearance, on request of the pilot or when the QNH changes. A typical radio conversation may be:- Air Traffic Control Towers (ATCTs) at Schiphol Airport Air Traffic Control (ATC) is a service provided by ground-based controllers who direct aircraft on the ground and in the air. ...

  • Pilot: Golf Whiskey Alpha Charlie Foxtrot, requesting Cotswold QNH
  • ATC: Golf Charlie Fox, Cotswold QNH one-zero-one-three
  • Pilot: QNH one-zero-one-three, Golf Charlie Fox

Here, the pilot of GWACF requests the regional air pressure, which is given as 1013 millibars for the Cotswold region (one of twenty Altimeter Setting Regions into which UK Lower Airspace is divided). The pilot reads back the safety-critical part of the transmission (in this case the QNH), as it is required to do. The Cotswolds is the name given to a range of hills in central England, sometimes called the Heart of England, a hilly area reaching over 300 m or 1000 feet. ...


In most parts of the world, QNH is given in millibars (or hectopascals). In North America, QNH is given in inches and hundredths thereof inches of mercury (in the example, ATC would say "Golf Charlie Fox, altimeter two niner niner two" as in 29.92 inches of mercury). A millibar (mbar, also mb) is 1/1000th of a bar, a unit for measurement of pressure. ... The pascal (symbol Pa) is the SI unit of pressure. ... World map showing North America A satellite composite image of North America. ... Pressure is the application of force to a surface, and the concentration of that force in a given area. ...


See also


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QNH is a Q code used by pilots, air traffic control (ATC) and low frequency weather beacons to refer to the barometric altimeter setting which will cause the altimeter to read altitude above mean sea level within a certain defined region.
In the UK the lowest forecast value of QNH for an altimeter setting region is called the "Regional Pressure Setting" and may be used to ensure safe terrain separation when cruising at lower altitudes.
In North America, QNH is given in inches and hundredths thereof inches of mercury (in the example, ATC would say "Golf Charlie Fox, altimeter two niner niner two" as in 29.92 inches of mercury).
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