Narrative:

For departure from mtn and entry into the washington sfra an FSS abbreviated briefing was obtained specifically requesting notams and tfrs expected on the intended flight; status of R-4001 a and B and to file a sfra plan for entry at wooly at 4;300 MSL.after takeoff from runway 31 at mtn; runway heading was held and climb was made at about 700 ft/minute and 90 KTS. After takeoff I was advised to contact potomac approach. At this point my recollection of the sequence of events is uncertain but my best recollection is:I was given a squawk code.I was advised of king air traffic to my left and coming through my altitude and was focused on this while also being concerned about contact with ATC for entry into the sfra. I assumed radar contact had been made as a result of the traffic advisory.I was advised to change frequency. On contact I was advised to ident then advised to return to the previous frequency; I advised the controller I had just left that frequency. I was advised to ident again. I think I was climbing through 3;700 ft MSL. At this point a male voice came on (probably a trainer) and I was advised to descend immediately. I descended rapidly to 2;000 ft MSL. I was then advised to contact via landline at the conclusion of my flight and that I had entered class B without authorization and a commercial carrier had passed with in 300 ft. I did not see this aircraft. I do not recall getting specific authorization to enter class B airspace.it is evident by the request for a phone call that I failed to assure specific approval from the appropriate frequency to enter class B airspace though it was evident to me that radar contact and communications had been established. I was not aware that potomac approach could not issue authorization to enter class B. I thought I was authorized entry.

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Original NASA ASRS Text

Title: Pilot reports filing an SFRA flight plan for departure from MTN with entry at the WOOLY gate and a planned altitude of 4;300 FT. After takeoff from Runway 31 he is chastised for entering Class B airspace without a clearance to do so.

Narrative: For departure from MTN and entry into the Washington SFRA an FSS Abbreviated Briefing was obtained specifically requesting NOTAMs and TFRs expected on the intended flight; status of R-4001 A and B and to file a SFRA plan for entry at WOOLY at 4;300 MSL.After takeoff from Runway 31 at MTN; runway heading was held and climb was made at about 700 FT/minute and 90 KTS. After takeoff I was advised to contact Potomac Approach. At this point my recollection of the sequence of events is uncertain but my best recollection is:I was given a squawk code.I was advised of King Air traffic to my left and coming through my altitude and was focused on this while also being concerned about contact with ATC for entry into the SFRA. I assumed radar contact had been made as a result of the traffic advisory.I was advised to change frequency. On contact I was advised to ident then advised to return to the previous frequency; I advised the Controller I had just left that frequency. I was advised to ident again. I think I was climbing through 3;700 FT MSL. At this point a male voice came on (probably a trainer) and I was advised to descend immediately. I descended rapidly to 2;000 FT MSL. I was then advised to contact via landline at the conclusion of my flight and that I had entered Class B without authorization and a commercial carrier had passed with in 300 FT. I did not see this aircraft. I do not recall getting specific authorization to enter Class B airspace.It is evident by the request for a phone call that I failed to assure specific approval from the appropriate frequency to enter Class B airspace though it was evident to me that radar contact and communications had been established. I was not aware that Potomac Approach could not issue authorization to enter Class B. I thought I was authorized entry.

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.