Descending to the 25nm MSA
Join Date: May 2008
Location: Euroland
Age: 53
Posts: 152
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- I do not really get the point of the question as under normal circumstances you would stick to the published altitudes on the approach plate, or the altitudes you are cleared to by ATC
- I have never done an arrival where I have chosen myself what altitude to descend to, unless I would be NORDO in which case you would have an emergency.
MINIMUM SAFE ALTITUDE/MSA (P/CG) -
(1) The minimum altitude specified in Federal Air
Regulations Part 91, for various aircraft operations.
(2) Altitudes depicted on approach charts which
provide at least 1000 feet of obstacle clearance for emergency
use within a specified distance from the navigation facility upon
which a procedure is predicated. These altitudes will be identified
as Minimum Sector Altitude or Emergency Safe Altitude and are
(1) The minimum altitude specified in Federal Air
Regulations Part 91, for various aircraft operations.
(2) Altitudes depicted on approach charts which
provide at least 1000 feet of obstacle clearance for emergency
use within a specified distance from the navigation facility upon
which a procedure is predicated. These altitudes will be identified
as Minimum Sector Altitude or Emergency Safe Altitude and are
established as follows:
(a) MINIMUM SECTOR ALTITUDES - Altitudes
depicted on approach charts which provide at least 1,000 feet of
obstacle clearance within a 25-mile radius of the navigation facility
upon which the procedure is predicated. Sectors depicted on
approach charts must be at least 90 degrees in scope. These
altitudes are for emergency use only and do not necessarily assure
acceptable navigational signal coverage.
(b) EMERGENCY SAFE ALTITUDES - Altitudes
depicted on approach charts which provide at least 1,000 feet of
obstacle clearance in non-mountainous areas and 2,000 feet of
obstacle clearance in designated mountainous areas within a 100-
mile radius of the navigational facility upon which the procedure is
predicated and normally used only in military procedures. These
altitudes are identified on published procedures as "Emergency
Safe Altitudes".
MINIMUM SECTOR ALTITUDE (ICAO) - The lowest altitude which
may be used under emergency conditions which will provide a
minimum clearance of 300 meters (1000 feet) above all obstacles
located in an area contained within a sector of a circle of 25 nautical
miles radius centered on a radio aid to navigation.
may be used under emergency conditions which will provide a
minimum clearance of 300 meters (1000 feet) above all obstacles
located in an area contained within a sector of a circle of 25 nautical
miles radius centered on a radio aid to navigation.
