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Mdt aircraft in cruise on STAR encountered 5 seconds of severe turbulence. Autoplt disconnected and aircraft pitched up climbing 600 ft before flight crew could take control and return to assigned altitude. ATC reported MD11 10 mi ahead.
| Attributes | |
| ACN | 387000 |
| Time | |
| Date | 199711 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ape |
| State Reference | OH |
| Altitude | msl bound lower : 24000 msl bound upper : 24600 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 170 flight time total : 15000 flight time type : 170 |
| ASRS Report | 387000 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter other non adherence : clearance other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : regained aircraft control |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
We were flying the STAR 'cince two' arrival at FL240. Suddenly we picked up some light turbulence that became moderate, then became severe for at least 5 seconds, causing the autoplt to self disengage, and allowing the airplane to deviate from its altitude by 500 or 600 ft high. We told center (indianapolis 134.0) what just happened, and we were coming back down to FL240. They told us that we were following a heavy MD11. On our TCASII it was showing more than 10 NM away, between 10 and 15 NM, not more not less.
Original NASA ASRS Text
Title: MDT ACFT IN CRUISE ON STAR ENCOUNTERED 5 SECONDS OF SEVERE TURB. AUTOPLT DISCONNECTED AND ACFT PITCHED UP CLBING 600 FT BEFORE FLC COULD TAKE CTL AND RETURN TO ASSIGNED ALT. ATC RPTED MD11 10 MI AHEAD.
Narrative: WE WERE FLYING THE STAR 'CINCE TWO' ARR AT FL240. SUDDENLY WE PICKED UP SOME LIGHT TURB THAT BECAME MODERATE, THEN BECAME SEVERE FOR AT LEAST 5 SECONDS, CAUSING THE AUTOPLT TO SELF DISENGAGE, AND ALLOWING THE AIRPLANE TO DEVIATE FROM ITS ALT BY 500 OR 600 FT HIGH. WE TOLD CTR (INDIANAPOLIS 134.0) WHAT JUST HAPPENED, AND WE WERE COMING BACK DOWN TO FL240. THEY TOLD US THAT WE WERE FOLLOWING A HVY MD11. ON OUR TCASII IT WAS SHOWING MORE THAN 10 NM AWAY, BTWN 10 AND 15 NM, NOT MORE NOT LESS.
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.