"Sikorsky has narrowed down very specifically what pieces of code are affected in the software and how we would induce those pieces of code to be triggered." (He was quoted in the aviation publication Global Flight.) Peter Allan, commander of 12 Wing Shearwater in Nova Scotia, said at the time. "It's more of a technical restriction and avoiding certain pieces of the code, really, in the software, making sure we don't induce a fault," Col. The limitations were meant to address the pitch and roll of the aircraft and only applied at certain altitudes and in specific flight control modes. Those restrictions, among other things, barred the aircraft from practice manoeuvres close to the ground, sloped landings and hoisting equipment and personnel. When the grounding of the fleet ended three years ago, the Cyclones continued to operate for a period of time under a series of flight restrictions while their manufacturer, Sikorsky Aircraft, addressed the software issue through a pre-planned upgrade. What wasn't fully revealed at the time, the sources said, was the fact that all three interconnected computers inexplicably reset themselves - something that could have led to a catastrophic crash.
The Maincident involving a software glitch aboard a Cyclone is a matter of public record.
Without warning, the helicopter suddenly pitched forward and "flew into the ocean," said the sources, who were granted anonymity because of the sensitivity of the investigation. Multiple defence sources tell CBC News that at the time of the crash, the Cyclone was conducting a high-speed, low-level photo pass of HMCS Fredericton, a manoeuvre known in the air force as a "Brownie Run" after a NATO standard camera. Chopper 'flew into the ocean,' say sources
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