ASN Wikibase Occurrence # 168814
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| Date: | Tuesday 11 September 2001 |
| Time: | 11:30 |
| Type: |  Bell 206B JetRanger II |
| Owner/operator: | Helicopters Otago |
| Registration: | ZK-HWI |
| MSN: | 1685 |
| Year of manufacture: | 1975 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Mount Pisa Station, Otago -
 New Zealand
|
| Phase: | Initial climb |
| Nature: | Agricultural |
| Departure airport: | Mount Pisa Station |
| Investigating agency: | TAIC |
| Confidence Rating: |  Accident investigation report completed and information captured |
On Tuesday, 11 September 2001, at about 11:30, ZK-HWI, a Bell JetRanger 206B II helicopter took off normally for a chemical spraying flight. On board the helicopter were an instructor pilot and a trainee who was the pilot flying the helicopter. Shortly after takeoff, when the helicopter was climbing away, the drive to the engine power turbine tachometer generator failed, causing the power turbine gauge indication to decrease.
The instructor pilot, believing the helicopter was losing power, immediately took control of the helicopter and instinctively lowered the collective lever. The helicopter descended and impacted the ground heavily with some forward speed, before lofting back into the air and again descending to the ground. The helicopter was extensively damaged.
The two pilots were not injured. A safety issue identified was the need for the helicopter maintenance company, in conjunction with operators it provides services for, to establish a robust system that ensures any additional maintenance due is recorded correctly, so additional maintenance is completed fully at the earliest opportunity.
Findings
1 The N2 tachometer generator drive failed shortly after take-off, which caused the N2 gauge indication to decrease and infer a loss of engine power, or transmission drive problem.
2 The instructor pilot did not have sufficient time to confirm the failure, and took the appropriate and immediate action necessary in response to what he perceived to be an engine power loss, or transmission problem, during a critical phase of flight.
3 The follow-up action necessary after field maintenance to the N2 tachometer generator drive was overlooked, and the drive remained in service until it deteriorated and failed.
4 The maintenance company and operator did not have a suitable system in place to make certain that any additional maintenance action required following field maintenance was recorded correctly and completed at the next available aircraft servicing.
Accident investigation:
 |
|
Sources:
TAIC
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 17-Aug-2014 06:24 | Aerossurance | Added |
| 18-Aug-2014 17:46 | harro | Updated [Aircraft type] |
| 26-Aug-2016 23:15 | Dr.John Smith | Updated [Date, Time, Cn, Operator, Location, Departure airport, Source, Embed code, Narrative] |
| 26-Aug-2016 23:17 | Dr.John Smith | Updated [Narrative] |
| 31-Mar-2018 17:08 | TB | Updated [Time, Operator, Location, Departure airport, Narrative] |
| 11-Oct-2021 18:12 | harro | Updated [Source, Narrative, Accident report] |
| 02-Feb-2022 04:51 | Ron Averes | Updated [Location] |
Corrections or additions? ... Edit this accident description
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