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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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C303 pilot on air taxi cargo flight has turbulence encounter with updrafts which take him within 300 ft vertically of another aircraft which is a few mi laterally. This sets off altitude alert at center.
| Attributes | |
| ACN | 370673 |
| Time | |
| Date | 199706 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : riw |
| State Reference | WY |
| Altitude | msl bound lower : 10000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc |
| Operator | common carrier : air taxi |
| Make Model Name | Cessna Twin Piston Undifferentiated or Other Model |
| Operating Under FAR Part | Part 135 |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Caravan 1 208A |
| Operating Under FAR Part | other : unknown |
| Flight Phase | cruise other |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : single pilot |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 4500 flight time type : 100 |
| ASRS Report | 370673 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : private |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance other anomaly other |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | none taken : unable other |
| Consequence | Other |
| Miss Distance | horizontal : 36000 vertical : 300 |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Between riw-cpr there was a lot of convective activity, a C208 was ahead of me at 11000 ft and I leveled off at 10000 ft. I caught an updraft of 3000 FPM and called center to verify altitude while I was trying to maintain 10000 ft and they send 10000 ft, but I was going up at 3000 FPM on the vsi with power off. Altitude alert went off at ZLC since there was no separation. They have me on tape saying what had happened also. It also happened so quick. There was no time to request a block altitude either. To make this not happen again, is to create some way to find these updrafts and downdrafts and put this equipment out to the aviation community so pilots don't have these problems in the future, because there is no way to see the updrafts or downdrafts with thunderstorms in GA aircraft.
Original NASA ASRS Text
Title: C303 PLT ON AIR TAXI CARGO FLT HAS TURB ENCOUNTER WITH UPDRAFTS WHICH TAKE HIM WITHIN 300 FT VERTLY OF ANOTHER ACFT WHICH IS A FEW MI LATERALLY. THIS SETS OFF ALT ALERT AT CTR.
Narrative: BTWN RIW-CPR THERE WAS A LOT OF CONVECTIVE ACTIVITY, A C208 WAS AHEAD OF ME AT 11000 FT AND I LEVELED OFF AT 10000 FT. I CAUGHT AN UPDRAFT OF 3000 FPM AND CALLED CTR TO VERIFY ALT WHILE I WAS TRYING TO MAINTAIN 10000 FT AND THEY SEND 10000 FT, BUT I WAS GOING UP AT 3000 FPM ON THE VSI WITH PWR OFF. ALT ALERT WENT OFF AT ZLC SINCE THERE WAS NO SEPARATION. THEY HAVE ME ON TAPE SAYING WHAT HAD HAPPENED ALSO. IT ALSO HAPPENED SO QUICK. THERE WAS NO TIME TO REQUEST A BLOCK ALT EITHER. TO MAKE THIS NOT HAPPEN AGAIN, IS TO CREATE SOME WAY TO FIND THESE UPDRAFTS AND DOWNDRAFTS AND PUT THIS EQUIP OUT TO THE AVIATION COMMUNITY SO PLTS DON'T HAVE THESE PROBS IN THE FUTURE, BECAUSE THERE IS NO WAY TO SEE THE UPDRAFTS OR DOWNDRAFTS WITH TSTMS IN GA ACFT.
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.