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ASN Wikibase Occurrence # 45917
Last updated: 22 March 2020
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Date:04-JUN-2001
Time:17:15
Type:Silhouette image of generic UH1 model; specific model in this crash may look slightly different
Bell UH-1H
Owner/operator:Wanganui Helicopters
Registration: ZK-HJH
C/n / msn:
Fatalities:Fatalities: 3 / Occupants: 3
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:3 E Taumarunui -   New Zealand
Phase: En route
Nature:Ferry/positioning
Departure airport:Auckland
Destination airport:Wanganui
Investigating agency: TAIC New Zealand
Narrative:
On Monday 4 June 2001 at about 1715, ZK-HJH, a Bell UH-1H Iroquois helicopter, was approaching Taumarunui when it was seen to enter a turn and fall to the ground, killing the three occupants. The helicopter was observed to break up before it hit the ground.

TAIC reopened the investigation after two other UH-1 accidents.

After considerable component and metallurgical testing and examination of all the available evidence, the resumed investigation could not support the original theory that the accident sequence was probably caused by the tail rotor crosshead coming loose, because of incorrect maintenance.

The resumed investigation found that a bent tail rotor blade pitch link and its subsequent fatigue failure during the accident flight brought about a loss of control and in-flight break-up of the helicopter. The link had been bent earlier at some point during the accident flight, which allowed it to crack and eventually fail from bending fatigue. The reason the link was bent could not be determined.

Sources:

http://www.ntsb.gov/ntsb/brief.asp?ev_id=20010613X01163&key=1
http://www.taic.org.nz/ReportsandSafetyRecs/AviationReports/tabid/78/ctl/Detail/mid/482/InvNumber/2001-005/Page/11/language/en-US/Default.aspx?SkinSrc=[G]skins%2ftaicAviation%2fskin_aviation
http://www.taic.org.nz/ReportsandSafetyRecs/AviationReports/tabid/78/ctl/Detail/mid/482/InvNumber/2001-005R/Page/6/language/en-US/Default.aspx?SkinSrc=[G]skins%2ftaicAviation%2fskin_aviation

Safety recommendations:

Safety recommendation 064/01 issued 10 December 2001 by TAIC to CAA NZ
Safety recommendation 065/01 issued 10 December 2001 by TAIC to CAA NZ
Safety recommendation 066/01 issued 10 December 2001 by TAIC to CAA NZ

Accident investigation:
cover
  
Investigating agency: TAIC New Zealand
Status: Investigation completed
Duration:
Download report: Final report


Revision history:

Date/timeContributorUpdates
28-Oct-2008 00:45 ASN archive Added
16-Aug-2014 17:36 Aerossurance Updated [Operator, Departure airport, Destination airport, Source, Narrative]
17-Aug-2014 06:21 Aerossurance Updated [Source]

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