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Sat, Aug 16, 2008

NTSB Updates Investigation On NorCal Helicopter Accident

CVR Chips Damaged In Fire, Sent To Manufacturer For Analysis

On Friday, the National Transportation Safety Board updated its investigation of the Shasta-Trinity Forest helicopter crash near Weaverville, CA on August 5, 2008, which killed nine of the 13 persons aboard.

The helicopter was a Sikorsky S-61N, registration number N612AZ, manufactured in 1964.

The NTSB team has departed the Redding area.  A ten-member group, including investigators from the NTSB, the U.S. Forest Service, Sikorsky and General Electric, traveled to Portland, OR this week to examine the engines, which were flown there on Monday. That examination is on-going.

The helicopter had taken on fuel immediately before the sortie that included the accident flight. Fuel samples from the truck that serviced the aircraft have been obtained and will be tested.

Interviews with firefighters who witnessed the accident have concluded. They consistently reported that the helicopter lifted off slower than they would have expected before striking trees and crashing more than 100 yards from the lift off point.

The helicopter's cockpit voice recorder arrived at NTSB headquarters Saturday morning, August 9. Upon examination, it was discovered that the solid state chips had been damaged by heat, and it was determined that the best way to try to extract information from the chips without further damaging them would be to use the facilities of the United Kingdom-based manufacturer, Penny and Giles.

Because officials of that company were unavailable to assist investigators this week, the recorder will be taken to England by an NTSB investigator next week.

The aircraft's maintenance records and records of the pilot's work history continue to be examined. The captain had about 20,000 hours of total flight time and the first officer had 3,000 hours of civilian flight time.

FMI: www.ntsb.gov

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