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| Date: | Thursday 29 July 2004 |
| Time: | |
| Type: |  Robinson R22 Beta |
| Owner/operator: | |
| Registration: | ZS-HUN |
| MSN: | 0915 |
| Year of manufacture: | 1989 |
| Engine model: | Lycoming O-360-J2A |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Other fatalities: | 0 |
| Aircraft damage: | |
| Category: | Accident |
| Location: | Farm Blouberg in the Vivo district -
 South Africa
|
| Phase: | Unknown |
| Nature: | Unknown |
| Departure airport: | Farm Blouberg in the Vivo district |
| Farm near the town of Vivo | |
| Investigating agency: | CAA S.A. |
| Confidence Rating: |  Accident investigation report completed and information captured |
The accident aircraft had been maintained by the same AMO (Aircraft Maintenance Organisation) for the past four years (s?1220 airframe hours), which amounted to 14 Mandatory Periodic Inspections, including a 12-year inspection (major overhaul), which was certified on 31 May 2004 followed by one last MPI prior to the accident, which was certified on 24 July 2004 at 5 650.5 airframe hours. According to the pilot, he had completed the required game herding operation for the day and was returning from the farm Blouberg to a farm near the town of Vivo. While in cruise flight overhead some high ground he noted a drop in engine/rotor RPM. He was unable to maintain altitude and rectify the problem as he had no throttle authority and had to execute a forced landing. He managed to turn away from the high ground into wind and conducted a forced landing in dense bush type terrain, resulting in substantial aircraft damage. The pilot was, however, not injured in the accident. PROBABLE CAUSE: The Throttle Over-travel Spring Assembly became dislodged (unscrewed) at the upper connecting rod-end arm support bracket, rendering the pilot without any throttle authority. The mechanical throttle linkage connected to the carburettor was gradually being pushed to the closed position as a result of the weight of the over-travel spring assembly, resulting in a decrease in engine power rendering ground impact (forced landing) inevitable.
Accident investigation:
 |
|
Sources:
S.A. CAA
Revision history:
| Date/time | Contributor | Updates |
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