What is the difference between qnh qfe qne

Display as a link instead. Clear editor. Upload or insert images from URL. Share More sharing options Followers 1. Reply to this topic Start new topic. Recommended Posts. Posted April 15, Link to comment Share on other sites More sharing options MagMen Posted April 15, Thanks for adding that SW. I've always been confusing these terms for more than 20 years.

A picture helps. Posted April 16, Join the conversation You can post now and register later. The altimeter will read runway elevation when the aircraft is on the runway. As your altimeter is calibrated using ISA, it will indicate altitude correctly at the airfield reference point. At other altitudes, the indicated altitude is likely to be in error, depending on the temperature of the atmosphere.

QFE - The pressure set on the subscale of the altimeter so that the instrument indicates its height above the reference elevation being used. QFE is the isobaric surface pressure at the reference point. At other altitudes the altimeter will give an indication of the height above that reference point. With the aerodrome QFE set in the subscale, your altimeter will read zero on the highest point on the runway and at other altitudes will read the height above the airfield elevation.

For precision approach runways or for instrument runways when the threshold is 7 ft or more below aerodrome elevation, the QFE may be based on the threshold elevation [ICAO Doc , 4.

With the runway threshold QFE set in the subscale, your altimeter will read zero on the runway threshold. Please note: Gulfstream Aerospace Corporation has no affiliation or connection whatsoever with this website, and Gulfstream does not review, endorse, or approve any of the content included on the site. As a result, Gulfstream is not responsible or liable for your use of any materials or information obtained from this site.

Settings Altimetry. Eddie sez:. Easy enough you say? Not so fast. Make sure you also take a look at: Altimeter Temperature Compensation if you are flying where it is very cold, and Altimetry, Metric if you are flying where it isn't so westernized. Last revision: Note 1. Altimeter Setting Procedures. Inches in of mercury Most of us in the United States are accustomed to using inches for that scale.

Millimeters mm of mercury A competing system that has pretty much died out in all but a few countries is millimeters of mercury, or mm. See Also:. Learning never stops. Copyright Code LLC. All Rights Reserved.