SIA flight goes missing on radar

The Telegraph, 14 Jul 2009
Another flight disappeared for half an hour from the secondary radar screen of the city airport on Monday, sparking fears of a mid-air mishap. The authorities blamed the incident on a snag at the airport.
Metro had reported on May 4 how five flights had gone missing from the screen within a span of a few days though the city air traffic control (ATC) had confirmed that all were in the airspace covered by the secondary or the Area South radar in Berhampore, Orissa.
The Singapore Airlines flight from Milan to Singapore vanished from the screen around 1.15am, within Calcutta’s flight information range.
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Flight to Singapore vanishes from radar - The Times Of India