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A PA-30 pilot experienced an near midair collision with a same direction high wing aircraft that passed 200 ft below the piper.
| Attributes | |
| ACN | 998541 |
| Time | |
| Date | 201203 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | BFI.Airport |
| State Reference | WA |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | PA-30 Twin Comanche |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise |
| Route In Use | None |
| Flight Plan | None |
| Aircraft 2 | |
| Make Model Name | Small Aircraft High Wing 1 Eng Fixed Gear |
| Person 1 | |
| Function | Single Pilot |
| Qualification | Flight Crew Multiengine Flight Crew Instrument Flight Crew Private |
| Experience | Flight Crew Last 90 Days 16 Flight Crew Total 613 Flight Crew Type 365 |
| Events | |
| Anomaly | Airspace Violation All Types Conflict NMAC |
| Miss Distance | Horizontal 0 Vertical 200 |
Narrative:
[I was] flying southbound just southwest of boeing field's delta airspace when southbound highwing plane passed just beneath me. I did not see it until just as it passed under my left wing. I waited to see it pass out on the other side but did not see it. I was concerned that it may be maneuvering rather than in straight and level flight and took evasive action via a turn to my left back to a northbound direction while looking for the traffic. I never did see it again; but I may have inadvertently entered boeing field's delta airspace without communication during my turn to avoid the traffic. Attitude estimated at 2;400 MSL but may be a couple of hundred feet either side of that as well. I was looking for traffic forward and to my side; but not approaching from my rear quarter. It was approaching me from my rear quarter and I should have been very visible to the other aircraft inasmuch as I was in front of it. I do not know how to prevent this type of encounter.
Original NASA ASRS Text
Title: A PA-30 pilot experienced an NMAC with a same direction high wing aircraft that passed 200 FT below the Piper.
Narrative: [I was] flying southbound just southwest of Boeing Field's Delta airspace when southbound highwing plane passed just beneath me. I did not see it until just as it passed under my left wing. I waited to see it pass out on the other side but did not see it. I was concerned that it may be maneuvering rather than in straight and level flight and took evasive action via a turn to my left back to a northbound direction while looking for the traffic. I never did see it again; but I may have inadvertently entered Boeing Field's Delta airspace without communication during my turn to avoid the traffic. Attitude estimated at 2;400 MSL but may be a couple of hundred feet either side of that as well. I was looking for traffic forward and to my side; but not approaching from my rear quarter. It was approaching me from my rear quarter and I should have been very visible to the other aircraft inasmuch as I was in front of it. I do not know how to prevent this type of encounter.
Data retrieved from NASA's ASRS site as of July 2013 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.