emergency safe altitude

Also found in: Acronyms.

emergency safe altitude (ESA)

Altitudes depicted on approach charts, which provide at least a 1000-ft obstacle clearance in nonmountainous areas and a 2000-ft obstacle clearance in designated mountainous areas within a 100-mile radius of the navigational aid on which the procedure is based. ESA is normally used in military procedures. These altitudes are identified on published procedures as “Emergency Safe Altitudes.”
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