Wednesday, May 10, 2017

Wrong ATC signal puts flights at risk

New Delhi: In a case of double jeopardy, the air traffic control (ATC) has been blamed for using a wrong call sign to tell an aircraft what to do for avoiding a mid-air collision with another plane that had got dangerously close to it.
This scary situation has been revealed by Aircraft Accident Investigation Board (AAIB) in its preliminary report on a near-miss close to Delhi between IndiGo flight 977 and KLM 811 that was flying from Amsterdam to Kuala Lumpur on November 2, 2016. The IndiGo Airbus A-320 had taken off from Delhi for Bengaluru.
Around midnight, "a predicted conflict warning (PCW) was generated by the automation system between KLM 811 and IndiGo 977 when IndiGo 977 was passing (flying level) 328 (32,800 feet) with vertical speed of 1,300 feet per minute. Controller (ATC) ignored PCW for approximately 82 seconds," the AAIB report submitted to the aviation ministry says. At this time, the "required standard lateral and vertical separation which should be 10 nautical miles (nm) or 18.5km and 1,000 feet, was reduced to 3.6 nm (6.6 km) and 200 feet, respectively" between the two planes that had hundreds of passengers on them.
10/05/17 Saurabh Sinha/The Times Of India