Welcome Guest. Sign in or Signup

1 Answers

Class B clearance expiration

Asked by: 2927 views , ,
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?

Ace Any FAA Written Test!
Actual FAA Questions / Free Lifetime Updates
The best explanations in the business
Fast, efficient study.
Pass Your Checkride With Confidence!
FAA Practical Test prep that reflects actual checkrides.
Any checkride: Airplane, Helicopter, Glider, etc.
Written and maintained by actual pilot examiners and master CFIs.
The World's Most Trusted eLogbook
Be Organized, Current, Professional, and Safe.
Highly customizable - for student pilots through pros.
Free Transition Service for users of other eLogs.
Our sincere thanks to pilots such as yourself who support AskACFI while helping themselves by using the awesome PC, Mac, iPhone/iPad, and Android aviation apps of our sponsors.

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.

    -1 Votes Thumb up 0 Votes Thumb down 1 Votes


The following terms have been auto-detected the question above and any answers or discussion provided. Click on a term to see its definition from the Dauntless Aviation JargonBuster Glossary.

Answer Question

Our sincere thanks to all who contribute constructively to this forum in answering flight training questions. If you are a flight instructor or represent a flight school / FBO offering flight instruction, you are welcome to include links to your site and related contact information as it pertains to offering local flight instruction in a specific geographic area. Additionally, direct links to FAA and related official government sources of information are welcome. However we thank you for your understanding that links to other sites or text that may be construed as explicit or implicit advertising of other business, sites, or goods/services are not permitted even if such links nominally are relevant to the question asked.