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Small aircraft at wrong altitude and had near midair collision with small transport. Small aircraft says hit updraft.
| Attributes | |
| ACN | 186676 |
| Time | |
| Date | 199108 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : las |
| State Reference | NV |
| Altitude | msl bound lower : 5500 msl bound upper : 5500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : las |
| Operator | common carrier : air carrier |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Flight Plan | VFR |
| Aircraft 2 | |
| Make Model Name | Small Aircraft, Low Wing, 1 Eng, Retractable Gear |
| Flight Phase | cruise other |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| ASRS Report | 186676 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : nmac inflight encounter : weather non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 400 vertical : 0 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Small aircraft Y was operating in the las vegas TCA without a transponder, he was assigned 4500 ft. Small transport X was overtaking the small aircraft Y at 5500 ft, I did not exchange traffic due to more than standard VFR separation that was present. Small transport X asked about small aircraft Y traffic that was at his altitude. I then asked the small aircraft Y his altitude and was told 5500, he said he, 'hit an updraft.' the pilot of small transport X had to take evasive action in order to prevent a mid air collision. I would suggest if any aircraft cannot comply with ATC instructions to advise immediately! Not only is it required but a darn good idea!
Original NASA ASRS Text
Title: SMA AT WRONG ALT AND HAD NMAC WITH SMT. SMA SAYS HIT UPDRAFT.
Narrative: SMA Y WAS OPERATING IN THE LAS VEGAS TCA WITHOUT A TRANSPONDER, HE WAS ASSIGNED 4500 FT. SMT X WAS OVERTAKING THE SMA Y AT 5500 FT, I DID NOT EXCHANGE TFC DUE TO MORE THAN STANDARD VFR SEPARATION THAT WAS PRESENT. SMT X ASKED ABOUT SMA Y TFC THAT WAS AT HIS ALT. I THEN ASKED THE SMA Y HIS ALT AND WAS TOLD 5500, HE SAID HE, 'HIT AN UPDRAFT.' THE PLT OF SMT X HAD TO TAKE EVASIVE ACTION IN ORDER TO PREVENT A MID AIR COLLISION. I WOULD SUGGEST IF ANY ACFT CANNOT COMPLY WITH ATC INSTRUCTIONS TO ADVISE IMMEDIATELY! NOT ONLY IS IT REQUIRED BUT A DARN GOOD IDEA!
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.