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Class B clearance expiration

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FAA Regulations

Is there a rule on Class B clearance expiring once you leave the airspace? For instance, on flight-following, you're cleared through B airspace: enter a corner of B, then exit it, and continue on the same vector, which will lead you through B again. Does your first clearance still apply? Does the phrase from the controller, "leaving Bravo Airspace" officially negate your Class B airspace clearance? If the controller doesn't say this phrase, is your clearance still valid?

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1 Answers



  1. Kris Kortokrax on Nov 10, 2014

    91.131 requires a clearance prior to entering Class B.
    I would say that once you leave the Class B, you need another clearance to reenter.

    Your question implies that there is some mission involved with the flight that would prevent you from deviating around the Class B airspace. In other words, you have no other choice, but to fly through the corner of the B airspace, leave and then reenter the B.

    I could envision this if I were conducting pipeline patrol or powerline patrol, where I need to follow a certain course to conduct the inspection. If this is the case, I would know ahead of time what the mission is and would coordinate with ATC over the phone before flying the mission. They would probably let me keep the same squawk code and would state whether they needed notification upon leaving and reentering the B airspace.

    If I am not flying a mission that would require this type of operation, I would just deviate around the B airspace.

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