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MD82 crew had an alternate autoplt trim runaway in the nose up direction. They had less than legal separation as the aircraft flew 800 ft from the cleared altitude.
| Attributes | |
| ACN | 610857 |
| Time | |
| Date | 200403 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zme.artcc |
| State Reference | TN |
| Altitude | msl bound lower : 33000 msl bound upper : 33800 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-82 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zme.artcc |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 610857 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| ASRS Report | 610870 |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly |
| Independent Detector | atc equipment other atc equipment : radar mode c aircraft equipment : tcas aircraft equipment other aircraft equipment : altimeter + rate of climb ind (ivsi) other controllera other flight crewa other flight crewb |
| Resolutory Action | controller : issued alert flight crew : overrode automation flight crew : regained aircraft control flight crew : returned to assigned altitude other |
| Consequence | other other |
| Miss Distance | vertical : 1200 |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
While in level cruise flight at FL330/.76 mach, captain flying, we experienced an alternate/autoplt trim runaway in the nose up direction. First officer called 'climb rate' and I looked up from the en route chart to see altitude going through FL333 and climbing. I disconnected the autoplt to level aircraft and discovered the trim was considerably nose up. It took an aggressive push and throttles to idle to arrest the climb. We reached about FL338 before starting down. We finally stabilized at FL327 and climbed back to FL330. I selected DFGS #2 and carefully reengaged the autoplt. ZME advised that we had lost separation with other traffic. We continued to dtw and wrote up the problem. Maintenance placarded the alternate trim system. Supplemental information from acn 610870: the captain disconnected the autoplt, and exclaimed he was experiencing high nose up pressure on the yoke. As the captain regained control, we received a TA on traffic crossing right to left at FL350.
Original NASA ASRS Text
Title: MD82 CREW HAD AN ALTERNATE AUTOPLT TRIM RUNAWAY IN THE NOSE UP DIRECTION. THEY HAD LESS THAN LEGAL SEPARATION AS THE ACFT FLEW 800 FT FROM THE CLRED ALT.
Narrative: WHILE IN LEVEL CRUISE FLT AT FL330/.76 MACH, CAPT FLYING, WE EXPERIENCED AN ALTERNATE/AUTOPLT TRIM RUNAWAY IN THE NOSE UP DIRECTION. FO CALLED 'CLB RATE' AND I LOOKED UP FROM THE ENRTE CHART TO SEE ALT GOING THROUGH FL333 AND CLBING. I DISCONNECTED THE AUTOPLT TO LEVEL ACFT AND DISCOVERED THE TRIM WAS CONSIDERABLY NOSE UP. IT TOOK AN AGGRESSIVE PUSH AND THROTTLES TO IDLE TO ARREST THE CLB. WE REACHED ABOUT FL338 BEFORE STARTING DOWN. WE FINALLY STABILIZED AT FL327 AND CLBED BACK TO FL330. I SELECTED DFGS #2 AND CAREFULLY REENGAGED THE AUTOPLT. ZME ADVISED THAT WE HAD LOST SEPARATION WITH OTHER TFC. WE CONTINUED TO DTW AND WROTE UP THE PROB. MAINT PLACARDED THE ALTERNATE TRIM SYS. SUPPLEMENTAL INFO FROM ACN 610870: THE CAPT DISCONNECTED THE AUTOPLT, AND EXCLAIMED HE WAS EXPERIENCING HIGH NOSE UP PRESSURE ON THE YOKE. AS THE CAPT REGAINED CTL, WE RECEIVED A TA ON TFC XING R TO L AT FL350.
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.