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New Delhi, April 15, 2010
The Airports Authority of India (AAI) today said that, contrary to media reports, there was no serious collision risk between an Air India flight IC 941 from Hyderabad to Delhi and Kingfisher flight KFR 3345 from Delhi to Bhubaneswar on April 5.
In a statement here, the AAI said the Kingfisher flight, which departed from Delhi, was climbing to flight level 250 and the Indian Airlines flight was descending to level 160 and both the aircraft were under radar control.
The statement said that, at the time of the incident, both the aircraft were approximately 35 miles south of Delhi.
"A predicted conflict alert was generated in the controller’s display when the Kingfisher flight was climbing through FL 175 [17500 feet] and the Indian Airlines Flight IAC 941 was descending through FL 186 [18600 feet]. Both the aircraft at this stage were separated by 1100 feet and 7 nautical miles [NMs] away from each other laterally as against the standard requirement of 1000 feet in vertical dimension and 3 NMs laterally," it said.
"Immediately the controllers had initiated corrective action to avoid a potential conflict by giving suitable radar vectors. However, while executing the avoiding maneuvers by the aircraft, the vertical separation between the two aircraft has reduced to 700 feet as against the requirement of 1000 feet," it said.
According to the statement, as both the aircraft involved in the incident were on different flight paths, one in-bound approaching for landing and the other had departed from Delhi, and corrective action was also initiated by the Air Traffic Controllers, even though there was a breach of separation while executing the avoiding manoeuvres by the aircraft, however, there was no risk of collision.
"As per standard practice, the air traffic controllers involved have been de-rostered while necessary investigations are being carried out," the statement added.