Minimum descent altitude (MDA)
Minimum descent altitude (MDA) - 14 CFR 1.1
Minimum Descent Altitude/Height ...
Minimum descent altitude (MDA). The lowest altitude (in feet MSL) to which descent is authorized on final approach, or during circle-to-land maneuvering in execution of a nonprecision approach.
Minimum Descent Altitude (MDA)
As written by the FAA the lowest altitude, expressed in feet above mean sea level, to which descent is authorized on final approach or during circle-to-land manoeuvring, ...
Minimum Descent Altitude - The lowest altitude to which a crew may descend in an attempt to obtain visual reference to the runway when flying a non-precision approach.
(See MINIMUM DESCENT ALTITUDE.)
HEIGHT ABOVE LANDING- The height above a designated helicopter landing area used for helicopter instrument approach procedures.
MDA: Minimum Descent Altitude (approach limitation).
METAR: Meteorological Airfield Report.
mm: millimetre(s).
MDA: Minimum Descent Altitude: During an instrument approach, this is how far down you're permitted to go before seeing the airport. If you go lower, you risk bumping into something (like the ground!) ...
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. where no glideslope guidance is given) without visual reference to the runway.
A minimum descent height (MDH) or minimum descent altitude (MDA) is the equivalent of the DA for non-precision approaches, however there are some significant differences.
Furthermore, if somebody built a 190-foot tower atop Blue Hill, the FAA would not change the Minimum Descent Altitude for this procedure, and there would be problems for sure.
 See also: Runway, Altitude, Flight, Service, Aircraft
  
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