When the ISA mean sea level standard pressure of 1013.2 hPa is set onĪn aircraft altimeter subscale, the height so indicated upon landingĪt an airfield is known as the QNE reading. ICAO has described how they calculate Pressure Altitude (b) No person may operate any automatic pressure altitude reporting equipment associated with a radar beacon transponder or with ADS-B Out equipment unless the pressure altitude reported for ADS-B Out and Mode C/S is derived from the same source for aircraft equipped with both a transponder and ADS-B Out. (3) Unless the altimeters and digitizers in that equipment meet the standards of TSO-C10b and TSO-C88, respectively. (2) Unless, as installed, that equipment was tested and calibrated to transmit altitude data corresponding within 125 feet (on a 95 percent probability basis) of the indicated or calibrated datum of the altimeter normally used to maintain flight altitude, with that altimeter referenced to 29.92 inches of mercury for altitudes from sea level to the maximum operating altitude of the aircraft or (1) When deactivation of that equipment is directed by ATC ![]() (a) No person may operate any automatic pressure altitude reporting equipment associated with a radar beacon transponder. §91.217 Data correspondence between automatically reported pressure altitude data and the pilot's altitude reference. Applying a correction factor to the indicated altitude according to the reported altimeter setting.įrom Docket No. Setting the barometric scale of the altimeter to 29.92 and reading the indicated altitude.Ģ. The pressure altitude can be determined by either of two methods:ġ. Performance, as well as for assigning flight levels to airplanes Pressure altitude is important as a basis for determining airplane Pressure changes, the SDP may be below, at, or above sea level. The altitude indicated is the pressure altitude. ![]() If the altimeter is set for 29.92 "Hg SDP, An altimeter is essentially a sensitive barometer calibrated to indicate altitude in Which is a theoretical level where the weight of the atmosphere isĢ9.92 "Hg (1,013.2 mb) as measured by a barometer. Pressure altitude is the height above a standard datum plane (SDP), As defined by FAA in the Pilot's Handbook of Aeronautical Knowledge:
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