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Flight crew of medium large transport determined yaw damper was inoperative. Returned to departure airport (mci) and landed.
| Attributes | |
| ACN | 114919 |
| Time | |
| Date | 198906 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : mci |
| State Reference | MO |
| Altitude | msl bound lower : 13000 msl bound upper : 13000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mci |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude landing 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 : 240 flight time total : 18000 flight time type : 240 |
| ASRS Report | 114919 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 125 flight time total : 5700 flight time type : 125 |
| ASRS Report | 114918 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : regained aircraft control flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Immediately after takeoff aircraft began an abrupt yawing motion (no dutch roll effect). Turned off yaw damper switch, then back on. Yawing motion ceased. Continued climb. Shortly thereafter, yawing motion resumed. Cycled yaw damper switch off and on, but with no affect. Reduced power and rate of climb. Check systems and indications. Noted no abnormalities. Advised ATC of intent to return to departure airport (mci) and land. Landed without incidence. No emergency declared. Maintenance found yaw damper coupler bad (failed rate gyro). Replaced unit. Departed again and proceeded to destination without incidence.
Original NASA ASRS Text
Title: FLT CREW OF MLG DETERMINED YAW DAMPER WAS INOPERATIVE. RETURNED TO DEP ARPT (MCI) AND LANDED.
Narrative: IMMEDIATELY AFTER TKOF ACFT BEGAN AN ABRUPT YAWING MOTION (NO DUTCH ROLL EFFECT). TURNED OFF YAW DAMPER SWITCH, THEN BACK ON. YAWING MOTION CEASED. CONTINUED CLIMB. SHORTLY THEREAFTER, YAWING MOTION RESUMED. CYCLED YAW DAMPER SWITCH OFF AND ON, BUT WITH NO AFFECT. REDUCED POWER AND RATE OF CLIMB. CHECK SYSTEMS AND INDICATIONS. NOTED NO ABNORMALITIES. ADVISED ATC OF INTENT TO RETURN TO DEP ARPT (MCI) AND LAND. LANDED WITHOUT INCIDENCE. NO EMER DECLARED. MAINT FOUND YAW DAMPER COUPLER BAD (FAILED RATE GYRO). REPLACED UNIT. DEPARTED AGAIN AND PROCEEDED TO DEST WITHOUT INCIDENCE.
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.