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ASN Wikibase Occurrence # 46290
Last updated: 17 November 2021
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Type:Silhouette image of generic H500 model; specific model in this crash may look slightly different
Hughes 369D
Registration: ZK-HMN
MSN: 470108D
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Location:12.5 km northwest of Milford Sound -   New Zealand
Phase: Unknown
Departure airport:
Destination airport:
Investigating agency: TAIC New Zealand
On Friday 23 March 2001, at 0705, Hughes 369D helicopter ZK-HMN experienced an engine flameout as the pilot applied collective control normally to arrest the helicopter's descent. The pilot landed the helicopter in trees on a mountain slope at about 3000 feet, some 12 km northwest of Milford Sound. The pilot and the crew member on board the helicopter were not injured.

Investigation showed a defective engine fuel control unit was responsible for the flameout. The fuel control unit had been repaired by an Australian component overhaul facility and released to service. After the fitment of the fuel control unit, the maintenance providers did not trace repeated engine overspeeding problems to the fuel control unit. Because of the involvement of an Australian component overhaul facility, the Australian Transport Safety Bureau was invited to join the investigation. Because of initial concerns of a quality assurance problem with the facility, the Australian Transport Safety Bureau initiated a systemic investigation into its performance. The Bureau will report on the investigation results separately. A survey of the main New Zealand maintenance organisations, and Civil Aviation Authority records, did not reveal other similar incidents involving fuel control units and power turbine governors. Other safety issues identified were trouble-shooting procedures by maintenance providers, and the monitoring of service bulletins.


Accident investigation:
Investigating agency: TAIC New Zealand
Status: Investigation completed
Download report: Final report
Other occurrences involving this aircraft

14 Aug 1978 N8600F Astro Copters 0 near Cascadia, Or sub

Safety recommendations:

Safety recommendation 050/01 issued 17 October 2001 by TAIC to FlightLine Aviation
Safety recommendation 051/01 issued 17 October 2001 by TAIC to FlightLine Aviation


Photo of ZK-HMN courtesy

Milford Sound (NZMF / MFN)
17 February 1996; (c) Marcel Colthoff (via Joop de Groot)

Revision history:

04-Nov-2008 10:35 ASN archive Added
17-Aug-2014 06:21 Aerossurance Updated [Location, Source, Narrative]
16-Sep-2019 10:16 BEAVERSPOTTER Updated [Cn, Damage]

Corrections or additions? ... Edit this accident description