- minimum flight altitude
- The lowest safe height above sea level at which aircraft may operate under IFR (instrument flight rules) conditions.
Aviation dictionary. 2014.
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Minimum safe altitude — Minimum safe altitude(MSA) is a concept used in planning and executing aircraft flights. It is an altitude which allows adequate vertical clearance from nearby terrain and manmade obstacles, and allows proper navigational functions. Contents 1… … Wikipedia
minimum IFR altitude — The lowest IFR (instrument flight rules) altitude established for use in a specific airspace. Depending on the airspace concerned, the minimum IFR altitude may be a minimum obstacle clearance altitude (MOCA), a minimum en route altitude (MEA), a… … Aviation dictionary
Minimum crossing altitude — In aviation, a minimum crossing altitude, or MCA, is the lowest altitude at which a navigational fix can be crossed when entering or continuing along an airway that will allow an aircraft to clear all obstacles while carrying out a normal climb… … Wikipedia
Minimum reception altitude — In aviation, minimum reception altitude (MRA) is the lowest altitude on an airway segment where an aircraft can be assured of receiving signals from navigation aids like VOR or NDB. Typically, the greater the distance between navigation aids, the … Wikipedia
minimum holding altitude — The lowest altitude prescribed for a holding pattern, which complies with requirements for obstruction clearance and ensures good reception of radio signals and of navigational aids. The minimum holding level provides a clearance of at least 1000 … Aviation dictionary
Minimum safety altitude — Altitude specified at the flight planning stage as the minimum altitude that can be descended to in order to maintain safe terrain separation. Generally, for VFR flight, a safe margin would be; Take a terrain elevation of 1,250 ft above mean sea… … Wikipedia
minimum crossing altitude — The lowest altitude at certain radio fixes at which an aircraft must cross when proceeding in the direction of a higher minimum en route instrument flight rules altitude … Military dictionary
minimum crossing altitude — The lowest altitude at specified radio fixes at which an aircraft must cross when proceeding in the direction of a higher minimum en route instrument flight rules altitude. It is depicted on the aeronautical charts as shown in the illustration … Aviation dictionary
Minimum Safe Altitude Warning — (MSAW) is an automated warning system for air traffic controllers (ATCO). It is a ground based safety net intended to warn the controller about increased risk of controlled flight into terrain accidents by generating, in a timely manner, an alert … Wikipedia
minimum descent altitude (MDA)/minimum descent height — A specified altitude or height in a non precision approach or circling approach below which descent must not be made without the required visual reference (ICAO). The MDA is referenced to the mean sea level, and the MDH is referenced to the… … Aviation dictionary