If you wish to contribute or participate in the discussions about articles you are invited to join SKYbrary as a registered user
Minimum Sector Altitude
From SKYbrary Wiki
| Article Information | ||
|---|---|---|
| Category: | General | 
|
| Content source: | SKYbrary | 
|
| Content control: | EUROCONTROL | 
|
MSA
Definition
The Minimum Sector Altitude (MSA) is the lowest altitude which may be used which will provide a minimum clearance of 300 m (1 000 ft) above all objects located in the area contained within a sector of a circle of 46 km (25 NM) radius centred on a radio aid to navigation. (ICAO PANS-OPS/I - definitions)
Description
Minimum sector altitudes or terminal arrival altitudes are established for each aerodrome and provide at least 300m (1 000 ft) obstacle clearance within 46 km (25 NM) of the navigation aid, initial approach fix, or intermediate fix associated with the approach procedure for that aerodrome. (ICAO PANS-OPS/1 - Section 5, Chapter 2, ยง2.3)
Note. Sometimes the acronym MSA is also used to represent minimum safe altitude, which has a different meaning from minimum sector altitude, so care should always be taken to establish which term the abbreviation MSA is referring to in any particular circumstance.