Millibar: The thousandth part of a bar, a bar being a unit of barometric pressure equal to 750Â-1mm (29Â-531in) of mercury at 0°C in latitude 45°.
mb: millibar(s).
MDA: Minimum Descent Altitude (approach limitation).
METAR: Meteorological Airfield Report.
mb - millibar.
MCU - management control unit
MDA - minimum descent altitude. The lowest altitude, in feet amsl, to which descent is authorised on final approach during a non-precision instrument landing (i.e.
25 millibar or the equivalent setting of 29.921 inches of mercury is entered into the altimeter and altitude is then referred to as a flight level.
25 millibars, or equivalently 29.92126 inches of mercury. As the altitude increases, the ISA temperature decreases at a rate of 6.5 degrees centigrade per kilometer, or very nearly 2 degrees C per thousand feet.
Hectopascal (hPa) - unit of pressure measurement, equivalent to one millibar (which see), now the ICAO standard for altimeter setting.
HEMS - helicopter emergency medical services.
ISA - Agreed International Standard Atmosphere (1013.2 millibars at 15'C) to permit accurate comparison of aircraft performance figures.
JASDF - Japan Air Self-Defense Force.
International Standard Atmosphere An imaginary atmosphere that assumes at mean sea level a temperature of 15° C and a pressure of 1,013Â-2 millibars, and a fall in temperature of 6Â-5°C per 1,000m of increased height from sea level up to 11,000m, ...
2 millibars (standard pressure) when the aircraft is at aerodrome elevation.
QNH: altitude above mean sea level based on local station pressure.
QTE: true line of position from a direction-finding station.
QUJ: true bearing ...
separated by notified intervals and each expressed as the number of hundreds of feet which would be indicated at that level on a pressure altimeter calibrated in accordance with the International Standard Atmosphere and set to 1013.2 millibars (ANO).
 See also: Aircraft, Aviation, Pilot, Flight, Altitude
  
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