From: "P.J. Bunyon" <P.J.Bunyon@newcastle.ac.uk> Date: 01 Feb 95 02:16:21 References: 1
View raw article or MIME structure
On 29 Jan 1995, Ian Urquhart wrote: > Please excuse my ignorance but what is QNH and QFE? I hold a US > commercial certificate and instrument rating and have not come across > these terms. There is only one altimeter setting and that's it. > Simple. Do Canadian pilots deal with this QNH and QFE business? > Just interested. QFE is the atmospheric pressure at AERODROME level. With this set, the altimeter shows your HEIGHT above the aerodrome. QNH is the atmospheric pressure at MEAN SEA LEVEL. With this set, the altimeter shows your ALTITUDE above MEAN SEA LEVEL. On a normal flight, you would take off with QNH set as this would give your altitude above sea level. The exception to this is if you're staying in the circuit, when your height above the aerodrome is more important. When approaching your destination aerodrome, if flying visually, you would change to the QFE when the field was in sight and then let down. Hope this helps, Pete.