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A C172 was released for service in non compliance with an airworthiness directive not correctly completed due to misreading of the directive.
| Attributes | |
| ACN | 579559 |
| Time | |
| Date | 200304 |
| Day | Mon |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| ASRS Report | 579559 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far other anomaly other |
| Independent Detector | other other : person 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : manuals performance deficiency : non compliance with legal requirements performance deficiency : scheduled maintenance performance deficiency : logbook entry performance deficiency : inspection |
| Supplementary | |
| Problem Areas | Chart Or Publication Maintenance Human Performance Aircraft |
| Primary Problem | Maintenance Human Performance |
Narrative:
After an engine change on a C172, and approximately 500 hour of operation, I removed the magneto to perform airworthiness directive 96-12-07, inspection of impulse coupling. I removed magneto, reread the airworthiness directive and, since this magneto was new from overhaul, and had a different type of flyweight retainers, I misinterpreted the directive. I signed off the airworthiness directive as no longer required. At a later date while reviewing the airworthiness directive again, I realized the mistake and assisted another mechanic in performing the directive. The impulse coupling was replaced as a precautionary measure.
Original NASA ASRS Text
Title: A C172 WAS RELEASED FOR SVC IN NON COMPLIANCE WITH AN AIRWORTHINESS DIRECTIVE NOT CORRECTLY COMPLETED DUE TO MISREADING OF THE DIRECTIVE.
Narrative: AFTER AN ENG CHANGE ON A C172, AND APPROX 500 HR OF OP, I REMOVED THE MAGNETO TO PERFORM AIRWORTHINESS DIRECTIVE 96-12-07, INSPECTION OF IMPULSE COUPLING. I REMOVED MAGNETO, REREAD THE AIRWORTHINESS DIRECTIVE AND, SINCE THIS MAGNETO WAS NEW FROM OVERHAUL, AND HAD A DIFFERENT TYPE OF FLYWEIGHT RETAINERS, I MISINTERPRETED THE DIRECTIVE. I SIGNED OFF THE AIRWORTHINESS DIRECTIVE AS NO LONGER REQUIRED. AT A LATER DATE WHILE REVIEWING THE AIRWORTHINESS DIRECTIVE AGAIN, I REALIZED THE MISTAKE AND ASSISTED ANOTHER MECH IN PERFORMING THE DIRECTIVE. THE IMPULSE COUPLING WAS REPLACED AS A PRECAUTIONARY MEASURE.
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.