C310 pilot is informed after landing that he may have been involved in a near midair collision with ...

Attributes
ACN	1176746
Time
Date	201406
Local Time Of Day	0601-1200
Place
Locale Reference	BDU.Airport
State Reference	CO
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Cessna 310/T310C
Operating Under FAR Part	Part 91
Flight Phase	Descent
Flight Plan	VFR
Aircraft 2
Make Model Name	Sail Plane
Operating Under FAR Part	Part 91
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Private
Experience	Flight Crew Last 90 Days 12 Flight Crew Total 2760 Flight Crew Type 2120
Events
Anomaly	Conflict NMAC
Miss Distance	Vertical 100

Narrative:

After landing at bdu I received a radio call from a glider pilot. Though he wasn't sure I was the aircraft; he said we had a near miss; even though he said he did not see the other aircraft; he heard it and that I had passed about 100 ft beneath him. I never saw his aircraft. I had been keeping a lookout and watching for other aircraft on my G500 (tis). I asked if he had a transponder; and he said no because he was a glider. If I was the aircraft that nearly collided with this glider; it was my responsibility to see and avoid him. That said; it is very difficult to spot gliders in the boulder; co; area due to terrain; size and flight characteristics. While this event has made me more aware of the potential conflicts with gliders in vicinity of the boulder airport; and I intend to be even more vigilant in my visual scan; I would suggest that it would be even more helpful if the FAA encouraged gliders to carry transponders given the greater use of TCAS; tis and ads-B traffic alerting.

Original NASA ASRS Text

Title: C310 pilot is informed after landing that he may have been involved in a NMAC with a glider. The glider pilot believes that the reporters aircraft passed 100 FT beneath him although he only heard the aircraft pass.

Narrative: After landing at BDU I received a radio call from a glider pilot. Though he wasn't sure I was the aircraft; he said we had a near miss; even though he said he did not see the other aircraft; he heard it and that I had passed about 100 FT beneath him. I never saw his aircraft. I had been keeping a lookout and watching for other aircraft on my G500 (TIS). I asked if he had a transponder; and he said no because he was a glider. If I was the aircraft that nearly collided with this glider; it was my responsibility to see and avoid him. That said; it is very difficult to spot gliders in the Boulder; CO; area due to terrain; size and flight characteristics. While this event has made me more aware of the potential conflicts with gliders in vicinity of the Boulder airport; and I intend to be even more vigilant in my visual scan; I would suggest that it would be even more helpful if the FAA encouraged gliders to carry transponders given the greater use of TCAS; TIS and ADS-B traffic alerting.

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.

C310 pilot is informed after landing that he may have been involved in a near midair collision with a glider. The glider pilot believes that the reporters aircraft passed 100 ft beneath him although he only heard the aircraft pass.