![]() These altitudes are normally used only in military procedures and are identified on published procedures as “Emergency Safe Altitudes. The MSA element contains one or several sectors and indicates the minimum safe altitude that provides a 1,000-foot or 300-meter obstacle clearance at a. MSAs are for emergency use only and do not necessarily assure acceptable navigational signal coverage.Īltitudes 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 navigation facility or waypoint used as the ESA center. ![]() These altitudes will be identified as Minimum Safe Altitudes or Emergency Safe Altitudes and are established as follows:Īltitudes depicted on approach charts which provide at least 1,000 feet of obstacle clearance within a 25-mile radius of the navigation facility, waypoint, or airport reference point upon which the MSA is predicated. Over any congested area of a city, town, or settlement, or over any open air assembly of persons, an altitude of 1,000 feet above the highest obstacle. Altitudes depicted on approach charts which provide at least 1,000 feet of obstacle clearance for emergency use. Departure Procedures Pretaxi Clearance Procedures Certain airports have established pretaxi clearance programs whereby pilots of departing instrument flight rules (IFR) aircraft may elect to receive their IFR clearances before they start taxiing for takeoff. The minimum altitude specified in 14 CFR Part 91 for various aircraft operations.ī. Perhaps this helps - from the FAA Glossary -Ī. ![]()
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