How secure are your redundant systems?

An article in the Guardian highlights the importance of functional testing of your redundant systems. In the incidents mentioned, two helicopters of identical make faced a main lubrication oil system failure while airborne. Though the back up system came on line, an alarm indicated that it was not working properly, so the crew had to make emergency landings in the sea. Later it was found out that the back up system was indeed working fine, but the alarm was wrongly configured.
Read the article in this link. 


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