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A B727-200 in climb at FL180 had cyclical yawing caused by the upper yaw damper.
| Attributes | |
| ACN | 410331 |
| Time | |
| Date | 199807 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : ind |
| State Reference | IN |
| Altitude | msl bound lower : 18000 msl bound upper : 18000 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | B727-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 160 flight time total : 10500 flight time type : 3500 |
| ASRS Report | 410331 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
During climb out, noticed aircraft cyclically yawing. Secured upper yaw damper and it stopped. Complied with abnormal procedures, flying lower cruise altitude and speed. Yaw damper had been written up and repaired on previous day. Callback conversation with reporter revealed the following information: the reporter stated the aircraft was a B727-200 and the cause of the upper yaw damper failure was not disclosed by maintenance. The reporter said the aircraft yaw damper had been written up and worked the previous day.
Original NASA ASRS Text
Title: A B727-200 IN CLB AT FL180 HAD CYCLICAL YAWING CAUSED BY THE UPPER YAW DAMPER.
Narrative: DURING CLBOUT, NOTICED ACFT CYCLICALLY YAWING. SECURED UPPER YAW DAMPER AND IT STOPPED. COMPLIED WITH ABNORMAL PROCS, FLYING LOWER CRUISE ALT AND SPD. YAW DAMPER HAD BEEN WRITTEN UP AND REPAIRED ON PREVIOUS DAY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A B727-200 AND THE CAUSE OF THE UPPER YAW DAMPER FAILURE WAS NOT DISCLOSED BY MAINT. THE RPTR SAID THE ACFT YAW DAMPER HAD BEEN WRITTEN UP AND WORKED THE PREVIOUS DAY.
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.