![]() These altitudes are normally used only in military procedures and are identified on published procedures as “Emergency Safe Altitudes. Its depicted as black letters with an asterisk along an airway. 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. Minimum Obstacle Clearance Altitude (MOCA) provides obstacle clearance plus of NAVAID reception. Minimum obstacle clearance altitude (MOCA) i: MOCA is the sum of: A: the maximum terrain or obstacle elevation, whichever is higher plus: B: 1 000 ft for elevation up to and including 6 000 ft or: C: 2 000 ft for elevation exceeding 6 000 ft rounded up to the next 100 ft. That last figureis a very low rate about 150 feet per minute at 100 knots. lowest published altitude that meets the obstacle clearance requirements for the route segments between radio fixes on airways, off-airway routes, or route. Below 5000 feet, it’s 150 feet pernautical mile, it’s 120 feet per mile between 5000 and 10,000feet and above that, it’s 100 feet per mile. The minimum en route altitude (MEA) ensures a navigation signal strong enough for adequate reception by the aircraft navigation (NAV) receiver and obstacle. 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. What is the standard rate of climb Actually, it’s a climb gradientthat varies with altitude. ![]() Altitudes depicted on approach charts which provide at least 1,000 feet of obstacle clearance for emergency use. 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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