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Aircraft equipment problem. Stuck throttle. Preparing to land, reporter aircraft had stuck throttle and not enough power to stop a hard landing. The helicopter rolled over as a result. Reporter suspects a throttle assembly nylon bushing as the cause.
| Attributes | |
| ACN | 335464 |
| Time | |
| Date | 199605 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : 2g9 |
| State Reference | PA |
| Altitude | agl bound lower : 0 agl bound upper : 5 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : personal |
| Make Model Name | Helicopter |
| Operating Under FAR Part | Part 91 |
| Flight Phase | landing other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : commercial pilot : cfi pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 40 flight time total : 4221 flight time type : 13 |
| ASRS Report | 335464 |
| Events | |
| Anomaly | aircraft equipment problem : critical conflict : ground critical other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency none taken : unable |
| Consequence | other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
Throttle stuck on approach to hover. Inadequate power in stuck position resulted in hard landing and rollover. After my incident, another builder notified me he had similar problem and determined cause was a nylon bushing in throttle assembly installed by factory. Factory bushing expands due to engine heat and impairs throttle movement.
Original NASA ASRS Text
Title: ACFT EQUIP PROB. STUCK THROTTLE. PREPARING TO LAND, RPTR ACFT HAD STUCK THROTTLE AND NOT ENOUGH PWR TO STOP A HARD LNDG. THE HELI ROLLED OVER AS A RESULT. RPTR SUSPECTS A THROTTLE ASSEMBLY NYLON BUSHING AS THE CAUSE.
Narrative: THROTTLE STUCK ON APCH TO HOVER. INADEQUATE PWR IN STUCK POS RESULTED IN HARD LNDG AND ROLLOVER. AFTER MY INCIDENT, ANOTHER BUILDER NOTIFIED ME HE HAD SIMILAR PROB AND DETERMINED CAUSE WAS A NYLON BUSHING IN THROTTLE ASSEMBLY INSTALLED BY FACTORY. FACTORY BUSHING EXPANDS DUE TO ENG HEAT AND IMPAIRS THROTTLE MOVEMENT.
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.