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DC10 flight crew encounters severe turbulence while at FL290 in cruise; aircraft deviates from altitude; TCAS TA received.
| Attributes | |
| ACN | 694549 |
| Time | |
| Date | 200604 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : bna.airport |
| State Reference | TN |
| Altitude | msl single value : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Weather Elements | Thunderstorm Turbulence |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme.artcc tower : las.tower |
| Operator | common carrier : air carrier |
| Make Model Name | DC-10 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : commercial pilot : cfi pilot : multi engine pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 30 flight time total : 10000 flight time type : 4000 |
| ASRS Report | 694549 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe inflight encounter : turbulence |
| Independent Detector | aircraft equipment : altitude alert other flight crewa |
| Resolutory Action | flight crew : exited adverse environment |
| Supplementary | |
| Problem Areas | Weather Environmental Factor Aircraft |
| Primary Problem | Weather |
Narrative:
Encountered severe turbulence while on radar vector from center to avoid thunderstorms at FL290 aircraft position was over 30 mi from cell when encountering uncontrollable updraft which caused autoplt to disconnect and altitude to increase 250-300 ft. Before able to arrest climb at precisely the same time; we got a TCAS 'traffic' advisory due to another aircraft directly above us at FL300. Experienced several updrafts and downdrafts during the 15-20 second event. Reported event to center. Had the aircraft inspected for damage at destination. None found. Rvsm: 1000 ft vertical clearance may not be enough when operating near thunderstorms where severe turbulence such as this might be encountered.
Original NASA ASRS Text
Title: DC10 FLT CREW ENCOUNTERS SEVERE TURB WHILE AT FL290 IN CRUISE; ACFT DEVIATES FROM ALT; TCAS TA RECEIVED.
Narrative: ENCOUNTERED SEVERE TURB WHILE ON RADAR VECTOR FROM CTR TO AVOID TSTMS AT FL290 ACFT POS WAS OVER 30 MI FROM CELL WHEN ENCOUNTERING UNCTLABLE UPDRAFT WHICH CAUSED AUTOPLT TO DISCONNECT AND ALT TO INCREASE 250-300 FT. BEFORE ABLE TO ARREST CLB AT PRECISELY THE SAME TIME; WE GOT A TCAS 'TFC' ADVISORY DUE TO ANOTHER ACFT DIRECTLY ABOVE US AT FL300. EXPERIENCED SEVERAL UPDRAFTS AND DOWNDRAFTS DURING THE 15-20 SECOND EVENT. RPTED EVENT TO CTR. HAD THE ACFT INSPECTED FOR DAMAGE AT DEST. NONE FOUND. RVSM: 1000 FT VERT CLRNC MAY NOT BE ENOUGH WHEN OPERATING NEAR TSTMS WHERE SEVERE TURB SUCH AS THIS MIGHT BE ENCOUNTERED.
Data retrieved from NASA's ASRS site as of January 2009 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.