Narrative:

While climbing on the POM6, dag transition, a TA occurs at 15800 MSL. Check radar screen for target, then visually acquire a glider low and right of the nose. Time elapsed between TA alert and visual acquisition of target was approximately 2 seconds. Glider was heading approximately 40-60 degrees relative to our heading. We were on a vector of 060 degrees. Notified ATC of near miss. Controller informed us that he showed no radar contact in our vicinity and we were never issued a TA prior to the event. If glider activity is common over the san gabriel mountains, then jet departures flying POM6 dag transition will be transitioning a hazardous area due to the lack of a radar return from gliders and ATC not able to issue a TA. Either stop the glider flying over the san gabriel mountains in the dag transition or change the path of the transition away from the mountains.

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Original NASA ASRS Text

Title: AN MD90 FLT CREW RECEIVES A TCASII TA FROM A GLIDER OPERATING IN THE VICINITY.

Narrative: WHILE CLBING ON THE POM6, DAG TRANSITION, A TA OCCURS AT 15800 MSL. CHK RADAR SCREEN FOR TARGET, THEN VISUALLY ACQUIRE A GLIDER LOW AND R OF THE NOSE. TIME ELAPSED BTWN TA ALERT AND VISUAL ACQUISITION OF TARGET WAS APPROX 2 SECONDS. GLIDER WAS HDG APPROX 40-60 DEGS RELATIVE TO OUR HDG. WE WERE ON A VECTOR OF 060 DEGS. NOTIFIED ATC OF NEAR MISS. CTLR INFORMED US THAT HE SHOWED NO RADAR CONTACT IN OUR VICINITY AND WE WERE NEVER ISSUED A TA PRIOR TO THE EVENT. IF GLIDER ACTIVITY IS COMMON OVER THE SAN GABRIEL MOUNTAINS, THEN JET DEPS FLYING POM6 DAG TRANSITION WILL BE TRANSITIONING A HAZARDOUS AREA DUE TO THE LACK OF A RADAR RETURN FROM GLIDERS AND ATC NOT ABLE TO ISSUE A TA. EITHER STOP THE GLIDER FLYING OVER THE SAN GABRIEL MOUNTAINS IN THE DAG TRANSITION OR CHANGE THE PATH OF THE TRANSITION AWAY FROM THE MOUNTAINS.

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.