American air-safety regulators have identified what potentially caused a seaplane to nosedive out of the sky and crash off Whidbey Island in September and issued an urgent safety notice to other operators of the plane model, a workhorse for B.C.’s coastal airlines.
Investigators from the U.S. National Transportation Safety Board found that parts in an actuator that operated the plane’s horizontal stabilizer — the control surfaces of the tail — had become detached, which may have caused the aircraft, a de Havilland DHC-3 operated by Friday Harbor Air, to crash over the Labour Day weekend, killing all 10 onboard.
The NTSB has issued an urgent safety recommendation to the U.S. Federal Aviation Authority and Transport Canada that the planes, also commonly known as the de Havilland Otter, be grounded until those parts can be visually inspected.
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Vancouver Island Air declined to comment. Harbour Air didn’t return Postmedia phone calls, but in an emailed statement vice-president of marketing Meredith Moll said maintenance staff have returned all 22 of its Otter aircraft to service after completing the additional inspection.
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The NTSB’s urgent notice said the Sept. 4 incident involved a Friday Harbor Air Otter, which took off from its base and reached level flight, continuing for 18 minutes before climbing slightly then plummeting about 1,000 feet in a near vertical dive into the water of Mutiny Bay. The Seattle Times reported that witnesses observed the plane spinning on the way down but without any “pitch change” to the engine’s sound during the descent.
Sweeney wouldn’t comment on the NTSB’s preliminary findings in this crash specifically but said, generally, that the work of regulators to identify the causes of crashes “is invaluable to us.”
Manufacturing of the Otter, most of which were built in the 1950s and ’60s, was discontinued decades ago, but Sweeney said 161 of the 466 made are still flying and Viking still puts considerable resources into making sure the planes remain airworthy and manufactures spare parts.
Despite the age of remaining aircraft, Sweeney said that because they’re not pressurized during flight, “there’s no end date, or best-before date” on the airframes, so long as they’re properly maintained.
https://www.timescol...l-crash-6030731
Edited by Victoria Watcher, 31 October 2022 - 04:47 AM.