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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Near midair collision between a glider landing on opposite end of active runway where a tow aircraft, with glider in tow, are taking off. This was caused by the glider running out of lift to make the runway in use. WX factors sinking air. Emergency situation. Evasive action both spn (Y) and tow plane (Z).
| Attributes | |
| ACN | 346385 |
| Time | |
| Date | 199609 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : hdh |
| State Reference | HI |
| Altitude | agl bound lower : 300 agl bound upper : 500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : personal |
| Make Model Name | Cessna Aircraft Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : initial |
| Flight Plan | None |
| Aircraft 2 | |
| Operator | general aviation : instructional |
| Make Model Name | Sail Plane |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other descent : approach landing other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | other other : other pilot : cfi pilot : atp pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 200 flight time total : 1900 flight time type : 8 |
| ASRS Report | 346385 |
| Person 2 | |
| Affiliation | Other |
| Function | instruction : instructor |
| Qualification | pilot : commercial pilot : cfi |
| Events | |
| Anomaly | conflict : nmac inflight encounter : weather other anomaly other other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
I was towing gliders at dillingham airfield. On the last tow, the glider instructor told me to advise the unicom operator that he was going to do a simulated rope break. He also indicated that he would do a 180 degree turn and enter right traffic for runway 8. This was reported to the unicom. After simulating the rope break at approximately 300 ft, the glider encountered severe sink and had to land on runway 26. While turning for the runway, another tow plane with a glider took off on runway 8. Each aircraft saw each other and took evasive action. On days with unusual WX conditions, it would probably be better to allow more spacing between gliders and tow planes for better collision avoidance.
Original NASA ASRS Text
Title: NMAC BTWN A GLIDER LNDG ON OPPOSITE END OF ACTIVE RWY WHERE A TOW ACFT, WITH GLIDER IN TOW, ARE TAKING OFF. THIS WAS CAUSED BY THE GLIDER RUNNING OUT OF LIFT TO MAKE THE RWY IN USE. WX FACTORS SINKING AIR. EMER SIT. EVASIVE ACTION BOTH SPN (Y) AND TOW PLANE (Z).
Narrative: I WAS TOWING GLIDERS AT DILLINGHAM AIRFIELD. ON THE LAST TOW, THE GLIDER INSTRUCTOR TOLD ME TO ADVISE THE UNICOM OPERATOR THAT HE WAS GOING TO DO A SIMULATED ROPE BREAK. HE ALSO INDICATED THAT HE WOULD DO A 180 DEG TURN AND ENTER R TFC FOR RWY 8. THIS WAS RPTED TO THE UNICOM. AFTER SIMULATING THE ROPE BREAK AT APPROX 300 FT, THE GLIDER ENCOUNTERED SEVERE SINK AND HAD TO LAND ON RWY 26. WHILE TURNING FOR THE RWY, ANOTHER TOW PLANE WITH A GLIDER TOOK OFF ON RWY 8. EACH ACFT SAW EACH OTHER AND TOOK EVASIVE ACTION. ON DAYS WITH UNUSUAL WX CONDITIONS, IT WOULD PROBABLY BE BETTER TO ALLOW MORE SPACING BTWN GLIDERS AND TOW PLANES FOR BETTER COLLISION AVOIDANCE.
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.