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ASN Wikibase Occurrence # 43424
Last updated: 26 November 2021
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Type:Silhouette image of generic B47G model; specific model in this crash may look slightly different
Bell 47G-4A
Owner/operator:Hansen Helicopters
Registration: N474GA
MSN: 7580
Fatalities:Fatalities: 1 / Occupants: 1
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:Guam, GU -   Guam
Phase: En route
Nature:Banner and glider towing
Departure airport:Tamuning
Destination airport:
Investigating agency: NTSB
The pilot was towing a banner offshore. Witnesses reported everything was normal until the banner fell free from the helicopter. At that point the helicopter started rotating to the right and descended into the bay. During the on-scene investigation, the retaining nut for the universal joint to yoke assembly on the tail rotor drive was found not engaged but retained the safety wire. The safety wire was broken on the last twist prior to entering the universal's affixing hole. The solid drive pin located in the aft universal and through the drive shaft was missing. CAUSE: loss of tail rotor control due to improper maintenance.



Revision history:

24-Oct-2008 10:30 ASN archive Added
21-Dec-2016 19:24 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]

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