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Preface

What kind of obstacle clearance are you provided while flying on an airway that is not within a designated mountainous area?

1.

1000 feet within four statute miles on each side of centerline

2.

1000 feet along the centerline, tapering to zero at four nautical miles on each side of centerline

3.

500 feet within four nautical miles on each side of centerline

4.

500 feet within two nautical miles on each side of centerline

5.

1000 feet within four nautical miles on each side of centerline

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