What is the standard obstacle clearance?
What is the standard obstacle clearance? The required obstacle clearance is 1000 feet in non-mountainous terrain and 2000 feet in designated mountainous areas. The extra clearance over mountains is because of the Bernoulli effect as air flows over the mountains.
What is the standard climb gradient for takeoff?
The standard aircraft departure climb gradient (CG) is 200 feet per nautical mile. This value is designed to provide 48 feet of clearance at one nautical mile from the departure end of the runway (DER).