 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Approach controller vectoring a B737 noticed 2 primary targets near the las VOR. Traffic was given to the B737 who spotted 1 spn low over the mountains, but did not see the second spn until it passed at the same altitude in close proximity. Approach controller had the targets merge on his scope which would indicate a proximity of about 300 ft.
| Attributes | |
| ACN | 337638 |
| Time | |
| Date | 199606 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : las |
| State Reference | NV |
| Altitude | msl bound lower : 12500 msl bound upper : 12500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : las tower : msy |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Sail Plane |
| Flight Phase | cruise other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller military : 9 controller non radar : 11 controller radar : 17 |
| ASRS Report | 337638 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : nmac non adherence : far |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | none taken : insufficient time |
| Consequence | Other |
| Miss Distance | horizontal : 300 vertical : 0 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
The B737 was being vectored to a downwind for runway 25. I observed 2 primary targets on radar approximately 20 mi west of las VORTAC. Traffic was issued to the B737. The pilot reported to see 1 glider low over the mountains. A few seconds later the pilot reported a glider at his altitude (12500 ft) opposite direction from his flight path. I observed the targets merge. The pilot stated the glider was right at his altitude when the targets had merged, I don't believe the pilot had time to take action.
Original NASA ASRS Text
Title: APCH CTLR VECTORING A B737 NOTICED 2 PRIMARY TARGETS NEAR THE LAS VOR. TFC WAS GIVEN TO THE B737 WHO SPOTTED 1 SPN LOW OVER THE MOUNTAINS, BUT DID NOT SEE THE SECOND SPN UNTIL IT PASSED AT THE SAME ALT IN CLOSE PROX. APCH CTLR HAD THE TARGETS MERGE ON HIS SCOPE WHICH WOULD INDICATE A PROX OF ABOUT 300 FT.
Narrative: THE B737 WAS BEING VECTORED TO A DOWNWIND FOR RWY 25. I OBSERVED 2 PRIMARY TARGETS ON RADAR APPROX 20 MI W OF LAS VORTAC. TFC WAS ISSUED TO THE B737. THE PLT RPTED TO SEE 1 GLIDER LOW OVER THE MOUNTAINS. A FEW SECONDS LATER THE PLT RPTED A GLIDER AT HIS ALT (12500 FT) OPPOSITE DIRECTION FROM HIS FLT PATH. I OBSERVED THE TARGETS MERGE. THE PLT STATED THE GLIDER WAS RIGHT AT HIS ALT WHEN THE TARGETS HAD MERGED, I DON'T BELIEVE THE PLT HAD TIME TO TAKE ACTION.
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.