Danish investigators are indicating that a maintenance error led to the landing-gear actuator blockage which led a Scandinavian Airlines Bombardier Q400 to conduct a gear-up landing at Copenhagen last month.

It follows their discovery that an O-ring from a newly-replaced door valve caused the blockage of a restrictor valve in the actuator assembly. The blockage prevented the right-hand landing-gear deploying.

The subsequent gear-up landing was the third suffered by a Scandinavian Airlines Q400 since early September and the carrier opted to remove the entire fleet permanently from service.

But while the underlying reasons for the first two accidents, which resulted from actuator corrosion, have yet to be determined, Danish invest

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