General Planning

Question 1

Minimum Safe Altitude (MSA)

Answer 1

• provides at least 1000ft of vert obstacle clearance for emergency use within a specified distance from a nav facility
• minimum sector altitudes must be described at a minimum 90 degrees in scope

Question 2

Emergency Safe Altitudes (ESA)

Answer 2

• provide at least 1000 feet of obstacle clearance (2000 feet in designated mountainous terrain)
• 100 mile radius of nav facility; normally only used by military