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Maintenance technician failed to install cotter pin on throttle control resulting in engine shutdown in flight.
| Attributes | |
| ACN | 1630272 |
| Time | |
| Date | 201903 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Parked |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Inspection Authority Maintenance Powerplant |
| Experience | Maintenance Inspector 12 Maintenance Lead Technician 11 Maintenance Technician 34 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy |
Narrative:
During engine installation; I failed to install cotter pin in throttle control attachment nut and bolt. During flight; vibration loosened the nut and it fell off allowing the bolt to also fall free and resulting in loss of connection of the throttle control at the fuel servo. The engine speed remained at 2100 RPM. The pilot aligned with the runway and used mixture to shut down the engine when reaching the runway was assured. A power off landing was performed and the aircraft was undamaged then towed to the maintenance area where I discovered what had occurred. We are in the process of modifying policies and procedures to prevent recurrences of this incident.
Original NASA ASRS Text
Title: Maintenance Technician failed to install cotter pin on throttle control resulting in engine shutdown in flight.
Narrative: During engine installation; I failed to install cotter pin in throttle control attachment nut and bolt. During flight; vibration loosened the nut and it fell off allowing the bolt to also fall free and resulting in loss of connection of the throttle control at the fuel servo. The engine speed remained at 2100 RPM. The pilot aligned with the runway and used mixture to shut down the engine when reaching the runway was assured. A power off landing was performed and the aircraft was undamaged then towed to the maintenance area where I discovered what had occurred. We are in the process of modifying policies and procedures to prevent recurrences of this incident.
Data retrieved from NASA's ASRS site 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.