A lot of the PPRuNe crowd is evidently unfamiliar with the sensationalist tack of most media with regards to air travel, especially out of India. Nothing in that article leads me to believe that the aircraft was ever in any danger after the pilots lost their "vital" navigation instruments. There is plenty in that article, however, that leads me to believe that the check airman needs to be sacked, at the very least.
It's a shame we still hear of incidents like this from time to time. Reminds me of a story I heard of a check airman out of a country in Central America who pulled one of the throttles back on a heavy B727 to see if the pilot could handle a V2 cut. He was removed from service soon after. I know that if any check pilot on one of my flights were to concoct a "test" like that, he would witness a sterling example of the methods by which a crew member should deal with an in-flight saboteur.