3-473: QFF is an aeronautical code Q code . It is the MSL pressure derived from local meteorological station conditions in accordance with meteorological practice. This is the altimeter setting that is intended to produce correct altitude indication (i.e., no error) on an altimeter at the actual sea level elevation, while QNH is intended to have no error at the station elevation (or, especially when applied within
6-402: A region with a relatively small range of surface elevations, at the altitudes close to the surface elevation within the region). Meteorological practice of calculating QFF differs between meteorological organizations around the world. Some examples: Aeronautical Code signals The Aeronautical Code signals are radio signal codes. They are part of a larger set of Q Codes allocated by
9-709: The ITU-R . The QAA–QNZ code range includes phrases applicable primarily to the aeronautical service, as defined by the International Civil Aviation Organisation. First defined in ICAO publication "Doc 6100-COM/504/1" in 1948 and in "ICAO Procedures for Air Navigation Services, Abbreviations and Codes (PAN a S-ABC)" [Doc8400-4] (4th edition 1989), the majority of the Q codes have slipped out of common use; for example today reports such as QAU ("I am about to jettison fuel") and QAZ ("I am flying in
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