Aircraft responded to a resolution advisory (RA) while on approach. During the evasive event there w...

Narrative:

VFR flight from to [airport X]. Level at 9;500 MSL and approximately 10 miles outside the outer limit of denver class B airspace I was switched over to denver approach. I checked in and requested clearance into class B airspace. This request was denied and I was told to remain clear of class B airspace and to descend below. I made a decent to 8;500 MSL to fly below the outer layer of class B airspace with a floor of 9;000 feet MSL. The next layer of class B airspace had a floor of 8;000 feet MSL. I again requested clearance into class B airspace and was told that I would not be cleared into the airspace and that they handle 100's of aircraft VFR in and out of [airport X] each day. I informed the controller I did not want to descend below the 8;000 MSL layer until I was closer to [airport X]. I was then informed by the controller that the floor of the airspace in front of me was 10;000 MSL. I responded that my charts said 8;000 MSL and started a descend to 7;800 MSL to remain clear of the class B airspace. As soon I leveled at 7;800 to remain clear of the airspace a traffic contact 500 below me came up on my TCAS as a yellow target. [Airport X] tower informed me of the traffic; said he thought they were talking to denver approach and that I might need to make a turn or climb to avoid the traffic if they continued to climb. The traffic did not level off and my TCAS gave me an RA 'traffic; climb climb!' I responded as necessary which caused me to climb into the class B airspace at an altitude of 8300 MSL. Where I temporarily leveled until my TCAS gave me the RA clear message and then I descended back to 7;800 MSL.

Original NASA ASRS Text

Title: Aircraft responded to a Resolution Advisory (RA) while on approach. During the evasive event there was a possible incursion into class B airspace; but it is not clear that it actually occurred. Denver approach control did not state as such.

Narrative: VFR flight from to [Airport X]. Level at 9;500 MSL and approximately 10 miles outside the outer limit of Denver Class B airspace I was switched over to Denver Approach. I checked in and requested clearance into Class B airspace. This request was denied and I was told to remain clear of Class B airspace and to descend below. I made a decent to 8;500 MSL to fly below the outer layer of Class B airspace with a floor of 9;000 feet MSL. The next layer of Class B airspace had a floor of 8;000 feet MSL. I again requested clearance into Class B airspace and was told that I would not be cleared into the airspace and that they handle 100's of aircraft VFR in and out of [Airport X] each day. I informed the controller I did not want to descend below the 8;000 MSL layer until I was closer to [Airport X]. I was then informed by the controller that the floor of the airspace in front of me was 10;000 MSL. I responded that my charts said 8;000 MSL and started a descend to 7;800 MSL to remain clear of the Class B airspace. As soon I leveled at 7;800 to remain clear of the airspace a traffic contact 500 below me came up on my TCAS as a yellow target. [Airport X] tower informed me of the traffic; said he thought they were talking to Denver Approach and that I might need to make a turn or climb to avoid the traffic if they continued to climb. The traffic did not level off and my TCAS gave me an RA 'Traffic; Climb Climb!' I responded as necessary which caused me to climb into the Class B airspace at an altitude of 8300 MSL. Where I temporarily leveled until my TCAS gave me the RA clear message and then I descended back to 7;800 MSL.

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.

Attributes
ACN	1317634
Time
Date	201512
Local Time Of Day	0601-1200
Place
Locale Reference	D01.TRACON
State Reference	CO
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Small Transport
Operating Under FAR Part	Part 91
Flight Phase	Descent
Route In Use	Direct
Flight Plan	VFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Function	Single Pilot Pilot Flying Captain
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 100 Flight Crew Total 4700 Flight Crew Type 100
Events
Anomaly	ATC Issue All Types Airspace Violation All Types Conflict Airborne Conflict
Miss Distance	Horizontal 1000 Vertical 200

Aircraft responded to a resolution advisory (RA) while on approach. During the evasive event there was a possible incursion into class B airspace; but it is not clear that it actually occurred. Denver approach control did not state as such.