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The flight crew of a fokker 100, while in cruise at FL230, noticed that the autoplt started making a 20 degree turn to the left. When the first officer touched the yoke, the aircraft snapped back to the right 15 degrees. Cabin attendants were injured.
| Attributes | |
| ACN | 562557 |
| Time | |
| Date | 200210 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zau.artcc |
| State Reference | IL |
| Altitude | msl single value : 23000 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc tower : dfw.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Fokker 100 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 562557 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other other spatial deviation |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | aircraft : automation overrode flight crew flight crew : regained aircraft control |
| Consequence | other other other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
While cruising at FL230 with autoplt engaged, and in navigation mode, aircraft started an uncommanded turn to left approximately 15-20 degrees. When the first officer touched the yoke, the aircraft snapped back to the right to approximately 15 degrees right. Roll rate was very rapid. 2 flight attendants were injured when they hit their heads on the overhead baggage bin. Approach was flown into ord with autoplt off. Maintenance was notified by phone on the gate at ord. Voice recorder circuit breaker was pulled in case it was needed. Callback conversation with reporter revealed the following information: the reporter stated that on arrival at ord, the crew was assigned another airplane so he had limited time to write up a report. The reporter said the maintenance action taken is unknown, as maintenance had forwarded no report to the crew.
Original NASA ASRS Text
Title: THE FLC OF A FOKKER 100, WHILE IN CRUISE AT FL230, NOTICED THAT THE AUTOPLT STARTED MAKING A 20 DEG TURN TO THE L. WHEN THE FO TOUCHED THE YOKE, THE ACFT SNAPPED BACK TO THE R 15 DEGS. CABIN ATTENDANTS WERE INJURED.
Narrative: WHILE CRUISING AT FL230 WITH AUTOPLT ENGAGED, AND IN NAV MODE, ACFT STARTED AN UNCOMMANDED TURN TO L APPROX 15-20 DEGS. WHEN THE FO TOUCHED THE YOKE, THE ACFT SNAPPED BACK TO THE R TO APPROX 15 DEGS R. ROLL RATE WAS VERY RAPID. 2 FLT ATTENDANTS WERE INJURED WHEN THEY HIT THEIR HEADS ON THE OVERHEAD BAGGAGE BIN. APCH WAS FLOWN INTO ORD WITH AUTOPLT OFF. MAINT WAS NOTIFIED BY PHONE ON THE GATE AT ORD. VOICE RECORDER CIRCUIT BREAKER WAS PULLED IN CASE IT WAS NEEDED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT ON ARR AT ORD, THE CREW WAS ASSIGNED ANOTHER AIRPLANE SO HE HAD LIMITED TIME TO WRITE UP A RPT. THE RPTR SAID THE MAINT ACTION TAKEN IS UNKNOWN, AS MAINT HAD FORWARDED NO RPT TO THE CREW.
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.