ASN Wikibase Occurrence # 273158
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| Date: | Friday 3 August 2001 |
| Time: | |
| Type: |  Enstrom F28 |
| Owner/operator: | |
| Registration: | ZS-HMC |
| MSN: | 371 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | |
| Category: | Accident |
| Location: | Tswaing Pan, 16 nm NW of Wonderboom -
 South Africa
|
| Phase: | |
| Nature: | |
| Departure airport: | Wonderboom Airport (FAWB) |
| Wonderboom Airport (FAWB) | |
| Investigating agency: | CAA S.A. |
| Confidence Rating: |  Accident investigation report completed and information captured |
The instructor and his student took off from Wonderboom on a training flight to the Pretoria General Flying (GF) area No.1. At Tswaing Pan ('crater'?) (16 nm NW of Wonderboom) the instructor took control of the helicopter and descended to approximately 200 ft above ground level. As the instructor opened the throttle and pulled the collective, he observed the engine over speeding (needles splitting ' wrong way ' eng. rpm up / rotor rpm down). The instructor and the student conducted training earlier in the morning and the student also completed a solo flight prior to the accident flight. The instructor then executed an autorotational landing into the crater. During the flare the tailrotor guard contacted the ground and was deflected into the main rotor blades causing it be severed. The occupants disembarked with no injuries. PROBABLE CAUSE: The accident occurred as a result of an unsuccessful autorotation due to the clutch (free wheel unit) failure. The clutch unit failed as a result of the fatigue failure of a number of the sprag teeth, causing the unit to become inoperative. The fatigue failure of the teeth was most probably caused by the misalignment of the unit in relation to the shaft. The lack of lubrication could also have played a contributing role.
Accident investigation:
 |
|
Sources:
S.A. CAA
Revision history:
| Date/time | Contributor | Updates |
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