ASN logo
ASN Wikibase Occurrence # 169448
Last updated: 16 April 2020
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information. If you feel this information is incomplete or incorrect, you can submit corrected information.

Date:21-JUL-2007
Time:17:40
Type:Silhouette image of generic H500 model; specific model in this crash may look slightly different
Hughes 369D
Owner/operator:US Department of the Interior
Registration: N69PF
C/n / msn: 1060012D
Fatalities:Fatalities: 0 / Occupants: 1
Aircraft damage: Substantial
Category:Accident
Location:Omak, WA -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Fire fighting
Departure airport:Omak, WA (KOMK)
Destination airport:
Investigating agency: NTSB
Narrative:
At the time of the accident, the pilot was descending into a hover over a pond that he was using for an aerial fire bucket refill site. As he began to level off in the hover, he heard a loud noise and felt an "accelerated vibration." Almost immediately thereafter, the helicopter began to spin to the right, so the pilot closed the throttle and made an autorotational landing in about three to four feet of water. A post-accident inspection of the helicopter revealed that the tail rotor driveshaft had failed in torsional overload, and that one of the tail rotor blades had experienced delaminating as a result of contact with the water over which the helicopter was hovering.


Probable Cause: The pilot's failure to maintain clearance from the surface of a pond that he was using as a water bucket refill site, which resulted in a tail rotor strike to the water's surface and a torsional overload failure of the tail rotor drive shaft.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20070808X01149&key=1


Revision history:

Date/timeContributorUpdates
02-Sep-2014 09:41 Aerossurance Added
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
04-Dec-2017 18:47 ASN Update Bot Updated [Operator, Other fatalities, Nature, Departure airport, Source, Narrative]

Corrections or additions? ... Edit this accident description