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A B727-200 in cruise at FL370 engaged the autoplt which entered an uncommanded turn to the left noticed by ATC.
| Attributes | |
| ACN | 452802 |
| Time | |
| Date | 199910 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : bkw.airport |
| State Reference | WV |
| Altitude | msl single value : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute airway : j149.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : flight engineer pilot : multi engine |
| Experience | flight time last 90 days : 180 flight time total : 6500 flight time type : 1800 |
| ASRS Report | 452802 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical airspace violation : exit non adherence : clearance other spatial deviation |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : returned to intended or assigned course |
| Consequence | other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
While autoplt was engaged, aircraft entered an uncommanded turn to the left. A continuous slight heading change was encountered with the turn knob centered in the detent. Pilots and controllers took notice. Autoplt was disengaged and aircraft vectored back on course.
Original NASA ASRS Text
Title: A B727-200 IN CRUISE AT FL370 ENGAGED THE AUTOPLT WHICH ENTERED AN UNCOMMANDED TURN TO THE L NOTICED BY ATC.
Narrative: WHILE AUTOPLT WAS ENGAGED, ACFT ENTERED AN UNCOMMANDED TURN TO THE L. A CONTINUOUS SLIGHT HDG CHANGE WAS ENCOUNTERED WITH THE TURN KNOB CTRED IN THE DETENT. PLTS AND CTLRS TOOK NOTICE. AUTOPLT WAS DISENGAGED AND ACFT VECTORED BACK ON COURSE.
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.