Narrative:

Aircraft X is a two-seat glider. It is a 67-foot wingspan carbon fiber aircraft visible on radar.while none of these are required; it is equipped with:- mode south transponder (with integral encoder)- flarm collision avoidance; including- 1090-only ads-B receiver (no 978; tis; or adsr);- cockpit display of traffic with impending collision warningroute was just west of class D [airspace]. Intent was to overfly class D on next leg to south-east. ATC was dialed in as 2nd radio frequency was but not selected as active frequency.while circling (climbing) above class D; imminent collision warning displayed (with audio warning). I looked but could not spot the other aircraft. I rolled out of the climb and rocked my wings vigorously while trying to spot the other aircraft. At about the same time I spotted it. The small bizjet [was] departing runway 27; spotted me and reduced rate of climb to pass underneath me. At this point I had inadvertently descended into class D due to descending during evasive maneuver.I switched to ATC frequency during evasive maneuver. ATC advised they were not receiving my altitude. I cycled the transponder and they then received altitude.mistake 1: I'm not absolutely sure; but I believe I had inadvertently selected the transponder 'on' rather than 'alt'. The transponder control is extremely small and a bit hard to see. Obviously its not helpful for ras if the transponder is not sending altitude! Needless to say I will check carefully in future that the switch is in the correct position. Mistake 2: I should have switched to ATC frequency sooner and advised my position; especially as I was near the departure route for the active runway. Because of evasive maneuver I was already in the class D when I established contact (and without permission).

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Original NASA ASRS Text

Title: Sailplane pilot reported a near-midair-collision and evasive action that resulted in an airspace incursion.

Narrative: Aircraft X is a two-seat Glider. It is a 67-foot wingspan carbon fiber aircraft visible on radar.While none of these are required; it is equipped with:- Mode S transponder (with integral encoder)- FLARM collision avoidance; including- 1090-only ADS-B receiver (no 978; TIS; or ADSR);- cockpit display of traffic with impending collision warningRoute was just west of Class D [airspace]. Intent was to overfly Class D on next leg to south-east. ATC was dialed in as 2nd radio frequency was but not selected as active frequency.While circling (climbing) above Class D; imminent collision warning displayed (with audio warning). I looked but could not spot the other aircraft. I rolled out of the climb and rocked my wings vigorously while trying to spot the other aircraft. At about the same time I spotted it. The small bizjet [was] departing runway 27; spotted me and reduced rate of climb to pass underneath me. At this point I had inadvertently descended into Class D due to descending during evasive maneuver.I switched to ATC frequency during evasive maneuver. ATC advised they were not receiving my altitude. I cycled the transponder and they then received altitude.Mistake 1: I'm not absolutely sure; but I believe I had inadvertently selected the transponder 'On' rather than 'Alt'. The transponder control is extremely small and a bit hard to see. Obviously its not helpful for RAs if the transponder is not sending altitude! Needless to say I will check carefully in future that the switch is in the correct position. Mistake 2: I should have switched to ATC frequency sooner and advised my position; especially as I was near the departure route for the active runway. Because of evasive maneuver I was already in the class D when I established contact (and without permission).

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.