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Aircraft experienced violent yaw as it climbed thru FL180. Returned and landed safety at departure airport.
| Attributes | |
| ACN | 113055 |
| Time | |
| Date | 198906 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : bwi |
| State Reference | MD |
| Altitude | msl bound lower : 18000 msl bound upper : 18000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 10800 flight time type : 510 |
| ASRS Report | 113055 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem flight crew : declared emergency none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
Aircraft yawed violently passing 18,000', followed immediately by 2ND yaw with right wing rising. Since autoplt was engaged it was disconnected and strong force used to level wings. No hydraulic or flight control lights. Emergency declared and returned to bwi. Did not use rudder, aileron and elevator felt normal. Rudder felt normal after landing. Suspect rudder, yaw damper, or autoplt problem.
Original NASA ASRS Text
Title: ACFT EXPERIENCED VIOLENT YAW AS IT CLIMBED THRU FL180. RETURNED AND LANDED SAFETY AT DEP ARPT.
Narrative: ACFT YAWED VIOLENTLY PASSING 18,000', FOLLOWED IMMEDIATELY BY 2ND YAW WITH RIGHT WING RISING. SINCE AUTOPLT WAS ENGAGED IT WAS DISCONNECTED AND STRONG FORCE USED TO LEVEL WINGS. NO HYD OR FLT CTL LIGHTS. EMER DECLARED AND RETURNED TO BWI. DID NOT USE RUDDER, AILERON AND ELEVATOR FELT NORMAL. RUDDER FELT NORMAL AFTER LNDG. SUSPECT RUDDER, YAW DAMPER, OR AUTOPLT PROBLEM.
Data retrieved from NASA's ASRS site as of August 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.