Narrative:

While on routine pipeline patrol I entered bwi class B surface area with controller's consent. I was given squawk code and idented. My route takes me approximately 1 mi north of bwi airport off the approach end of runway 15R and 15L. The controller called traffic arriving runway 10 and I confirmed visual and separation. As I passed runway 15R I saw under and to my right a commuter aircraft which appeared to be landing on runway 15R. The controller did not call traffic and due to my maneuvering I did not see the aircraft until it had passed me. I was handed off to another controller, and all I heard was the commuter pilot asking if anyone was talking to me. I checked in and was cleared on my route. I later found out the commuter pilot filed a near miss report with the tower. I do not feel the fault is with me, however, I will not take a chance. I feel it was controller error but if I could have known in advance of the use of runway 15R I would have been more alert. I was very preoccupied with avoiding traffic and following the pipeline I feel I was maxed out in workload. In my estimation the 2 aircraft came within 100-200 ft of each other. At the altitude and position of the 2 aircraft no evasive action could be taken due to the proximity of the ground and the aircraft speeds and confign.

Related reports:

Google
 

Original NASA ASRS Text

Title: SMA HAD LTSS FROM ACR ACFT ON APCH TO MULTIPLE RWY OP INTERSECTING RWYS.

Narrative: WHILE ON ROUTINE PIPELINE PATROL I ENTERED BWI CLASS B SURFACE AREA WITH CTLR'S CONSENT. I WAS GIVEN SQUAWK CODE AND IDENTED. MY RTE TAKES ME APPROX 1 MI N OF BWI ARPT OFF THE APCH END OF RWY 15R AND 15L. THE CTLR CALLED TFC ARRIVING RWY 10 AND I CONFIRMED VISUAL AND SEPARATION. AS I PASSED RWY 15R I SAW UNDER AND TO MY R A COMMUTER ACFT WHICH APPEARED TO BE LNDG ON RWY 15R. THE CTLR DID NOT CALL TFC AND DUE TO MY MANEUVERING I DID NOT SEE THE ACFT UNTIL IT HAD PASSED ME. I WAS HANDED OFF TO ANOTHER CTLR, AND ALL I HEARD WAS THE COMMUTER PLT ASKING IF ANYONE WAS TALKING TO ME. I CHKED IN AND WAS CLRED ON MY RTE. I LATER FOUND OUT THE COMMUTER PLT FILED A NEAR MISS RPT WITH THE TWR. I DO NOT FEEL THE FAULT IS WITH ME, HOWEVER, I WILL NOT TAKE A CHANCE. I FEEL IT WAS CTLR ERROR BUT IF I COULD HAVE KNOWN IN ADVANCE OF THE USE OF RWY 15R I WOULD HAVE BEEN MORE ALERT. I WAS VERY PREOCCUPIED WITH AVOIDING TFC AND FOLLOWING THE PIPELINE I FEEL I WAS MAXED OUT IN WORKLOAD. IN MY ESTIMATION THE 2 ACFT CAME WITHIN 100-200 FT OF EACH OTHER. AT THE ALT AND POS OF THE 2 ACFT NO EVASIVE ACTION COULD BE TAKEN DUE TO THE PROX OF THE GND AND THE ACFT SPDS AND CONFIGN.

Data retrieved from NASA's ASRS site as of July 2007 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.