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requirements are necessary to stay within the protected airspace and maintain adequate obstacle clearance. [Figure 4-32] A minimum of 1,000 feet of obstacle clearance is provided in the procedure turn primary area. [Figure 4-33] In the secondary area, 500 feet of obstacle clearance is provided at the inner edge, tapering uniformly to 0 feet at the outer edge. 

The primary and secondary areas determine obstacle clearance in both the entry and maneuvering zones. The use of entry and maneuvering zones provides further relief from obstacles. The entry zone is established to control the obstacle clearance prior to proceeding outbound from the procedure turn fix. The maneuvering zone is established to control obstacle clearance after proceeding outbound from the procedure turn fix. 

