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Altitude deviation altitude excursion -- WX factors an air carrier encounters an updraft from a thunderstorm that sends the aircraft 1800 ft above its assigned altitude.
| Attributes | |
| ACN | 313488 |
| Time | |
| Date | 199508 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : bro |
| State Reference | TX |
| Altitude | msl bound lower : 39000 msl bound upper : 40800 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | enroute airway : zhu |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi pilot : commercial |
| Experience | flight time last 90 days : 300 flight time total : 10000 flight time type : 300 |
| ASRS Report | 313488 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 200 flight time total : 21000 flight time type : 250 |
| ASRS Report | 313146 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance other anomaly |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Cruising at FL390, just in the tops, with no radar indication of cell activity and no advanced warning (such as increasing turbulence) we encountered turbulence, autoplt disengaged, and aircraft climbed to FL408 uncontrollably. My radio call was immediate to protect airspace above. I said 'we were being spit out of the top of something' controllers response was 'that's just fine, no conflicting traffic, let us know when you get back down.' event took maybe 3 mins.
Original NASA ASRS Text
Title: ALTDEV ALT EXCURSION -- WX FACTORS AN ACR ENCOUNTERS AN UPDRAFT FROM A TSTM THAT SENDS THE ACFT 1800 FT ABOVE ITS ASSIGNED ALT.
Narrative: CRUISING AT FL390, JUST IN THE TOPS, WITH NO RADAR INDICATION OF CELL ACTIVITY AND NO ADVANCED WARNING (SUCH AS INCREASING TURB) WE ENCOUNTERED TURB, AUTOPLT DISENGAGED, AND ACFT CLBED TO FL408 UNCONTROLLABLY. MY RADIO CALL WAS IMMEDIATE TO PROTECT AIRSPACE ABOVE. I SAID 'WE WERE BEING SPIT OUT OF THE TOP OF SOMETHING' CTLRS RESPONSE WAS 'THAT'S JUST FINE, NO CONFLICTING TFC, LET US KNOW WHEN YOU GET BACK DOWN.' EVENT TOOK MAYBE 3 MINS.
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.