The Singapore Airlines flight was cruising at an altitude of 37,000 feet. Just after 0800 GMT, the Boeing 777 suddenly and sharply pitched down to 31,000 feet over the span of some three minutes, the data shows.
The Air India aircraft was descending from 19,000 ft while the Nepal Airlines aircraft was flying at an altitude of 15,000 ft at the same location.
The sources said that an ATC posted at the Indira Gandhi International Airport (IGIA) here was subjected to the drug test.
New Delhi, May 29 : Fresh guidelines have been issued to pilots and air traffic controllers on ways to handle unexpected events like systems malfunction, communication trouble or weather-related problems, as was witnessed in the
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