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A DC10-10 had a yaw damper rate gyro replaced and tested by a mechanic not CAT ii or autoland qualified.
| Attributes | |
| ACN | 420320 |
| Time | |
| Date | 199811 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz |
| State Reference | US |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | DC-10 10 |
| Flight Phase | other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| Qualification | other other : other |
| ASRS Report | 420320 |
| Person 2 | |
| Affiliation | Other |
| Function | other personnel |
| Qualification | other other : other |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : published procedure non adherence : far other anomaly other |
| Independent Detector | other other : unspecified |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
Yaw damper problem written up in ZZZ. Yaw rate gyro was replaced by contract maintenance in ZZZ. Yaw rate gyro is a CAT ii item. The contract maintenance mechanic performed the incorrect CAT ii minimum test. He documented T30 test set used in the CAT ii test. By maintenance manual 22-00-2 page, no T30 test set is required. The CAT ii test was incorrect. The mechanic was not CAT ii qualified. The aircraft was not downgraded.
Original NASA ASRS Text
Title: A DC10-10 HAD A YAW DAMPER RATE GYRO REPLACED AND TESTED BY A MECH NOT CAT II OR AUTOLAND QUALIFIED.
Narrative: YAW DAMPER PROB WRITTEN UP IN ZZZ. YAW RATE GYRO WAS REPLACED BY CONTRACT MAINT IN ZZZ. YAW RATE GYRO IS A CAT II ITEM. THE CONTRACT MAINT MECH PERFORMED THE INCORRECT CAT II MINIMUM TEST. HE DOCUMENTED T30 TEST SET USED IN THE CAT II TEST. BY MAINT MANUAL 22-00-2 PAGE, NO T30 TEST SET IS REQUIRED. THE CAT II TEST WAS INCORRECT. THE MECH WAS NOT CAT II QUALIFIED. THE ACFT WAS NOT DOWNGRADED.
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.