Narrative:

Event occurred at the top of descent (while squawking 1200 with mode C) during a routine intra-state repositioning flight.twenty nautical miles after crossing directly over tampa's class bravo geographic center-point; we initiated a VFR/VMC descent from 10;500 feet while continuing to fly southwest.we were avoiding local traffic visually; monitoring local tpa TRACON radio; TCAS as well as ads-B (participating traffic). Inside the 30 mile mode C ring there was only one other aircraft in our vicinity; which we maneuvered to cross five miles in trail. No traffic conflict occurred.thirty nautical miles southwest of tpa we reversed course while continuing to descend to 1;600 ft. We also flew to be 500 ft. Below tpa's 3;000-10;000 ft. Twenty nautical mile outer shelf.at that time we proceeded to contact tpa on their local TRACON frequency. We informed tpa who we were; where we were and what we wanted to do.tampa's TRACON controller asked us if we knew that we had entered class B airspace without a clearance. I responded 'no' and said we had remained at 10;500 ft. Until crossing beyond and outside of the twenty mile 10;000 ft. Ring and that we had then re-crossed the same 20 mile ring at 2;500 ft.; which was 500 feet below the outer shelf's floor.he replied; yes you did; but that the southwestern control airspace at tampa now extends all the way out to the 30 NM mode C ring. My first officer and I simultaneously expanded out our VFR charts utilizing the efb foreflight on ipads to discover this to be true. I acknowledged the controller's reprimand apologetically and said it would never happen again.my first officer and I had thoroughly reviewed the flight to be conducted; including a standard briefing with flight services; but had not detected this change from the standard class B configuration. At the time of our transgression we had our VFR and GPS maps zoomed in to cleanly display traffic on our navigation devices.this was very embarrassing. A lesson learned; which will be put into practice during all subsequent flights.

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Original NASA ASRS Text

Title: LR55 flight crew reported that their failure to correctly read airspace parameters resulted in a Class B airspace incursion.

Narrative: Event occurred at the top of descent (while squawking 1200 with Mode C) during a routine intra-state repositioning flight.Twenty nautical miles after crossing directly over Tampa's Class Bravo geographic center-point; we initiated a VFR/VMC descent from 10;500 feet while continuing to fly southwest.We were avoiding local traffic visually; monitoring local TPA TRACON radio; TCAS as well as ADS-B (participating traffic). Inside the 30 mile Mode C ring there was only one other aircraft in our vicinity; which we maneuvered to cross five miles in trail. No traffic conflict occurred.Thirty nautical miles southwest of TPA we reversed course while continuing to descend to 1;600 ft. We also flew to be 500 ft. below TPA's 3;000-10;000 ft. twenty nautical mile outer shelf.At that time we proceeded to contact TPA on their local TRACON frequency. We informed TPA who we were; where we were and what we wanted to do.Tampa's TRACON Controller asked us if we knew that we had entered Class B Airspace without a clearance. I responded 'no' and said we had remained at 10;500 ft. until crossing beyond and outside of the twenty mile 10;000 ft. ring and that we had then re-crossed the same 20 mile ring at 2;500 ft.; which was 500 feet below the outer shelf's floor.He replied; yes you did; but that the Southwestern Control Airspace at Tampa now extends all the way out to the 30 NM Mode C Ring. My First Officer and I simultaneously expanded out our VFR Charts utilizing the EFB Foreflight on iPads to discover this to be true. I acknowledged the Controller's reprimand apologetically and said it would never happen again.My First Officer and I had thoroughly reviewed the flight to be conducted; including a standard briefing with Flight Services; but had not detected this change from the standard Class B configuration. At the time of our transgression we had our VFR and GPS maps zoomed in to cleanly display traffic on our navigation devices.This was very embarrassing. A lesson learned; which will be put into practice during all subsequent flights.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.