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| Date: | Sunday 19 April 1998 |
| Time: | 11:23 LT |
| Type: |  Aerospatiale AS 350D |
| Owner/operator: | |
| Registration: | ZK-HKU |
| MSN: | 1132 |
| Year of manufacture: | 1979 |
| Fatalities: | Fatalities: / Occupants: |
| Other fatalities: | 0 |
| Aircraft damage: | Unknown |
| Location: | Skyline Skyrides heliport, Rotorua -
 New Zealand
|
| Phase: | Approach |
| Nature: | Unknown |
| Departure airport: | |
| Skyline Skyrides heliport at Rotorua | |
| Investigating agency: | TAIC |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
The helicopter, fitted with an AlliedSignal LTS101 engine, experienced a total loss of engine power while on approach. The pilot made an autorotational landing onto uneven terrain. No injuries to the helicopter occupants resulted.
Examination of the engine revealed that excessively worn gas generator turbine rotor shroud sealing rings precipitated internal mechanical failure of the engine, which resulted in a total power loss. The worn sealing rings went undetected as the manufacturer's required engine performance trend monitoring procedures were not being followed.
Safety recommendations were made relating to loose engine B nuts, the provision for securing the B nuts, correct engine performance trend checking procedures, the appropriateness of allowing a person to act as an operator's maintenance controller when also employed by the maintenance service provider, the need for all applicable requirements for engine maintenance to be carried out, and the periodic inspection requirements for the gas producer shroud sealing rings.
Accident investigation:
 |
|
Sources:
https://taic.org.nz/inquiries?SkinSrc=[G]skins%2ftaicAviation%2fskin_aviation
History of this aircraft
Other occurrences involving this aircraft
| 21 July 1990 | N3598F | Petroleum Helicopters, Inc. | 0 | Berwick, LA |  |
sub |
| 10 February 2000 | ZK-HKV | Marine Helicopters Ltd. | 1 | Tapora, Northland | |
w/o |
| 11 November 2005 | ZK-HKU | 0 | CHCH Show Grounds | |
sub | |
| 9 August 2012 | ZK-HKU | 0 | Minaret Peak | |
sub | |
| 21 November 2015 | ZK-HKU | Fox and Franz Heli Services | 7 | Fox Glacier, Westland NP | |
w/o |
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 17-Aug-2014 06:21 | Aerossurance | Added |
| 23-Sep-2021 20:56 | Ron Averes | Updated [Location, ] |
Corrections or additions? ... Edit this accident description
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