India Regional CRJ7 and THY A333 near Amritsar on Sep 1st 2016, TCAS resolution, discussion about cleared FL
Last Update: September 4, 2016 / 16:11:44 GMT/Zulu time
A THY Turkish Airlines Airbus A330-300, registration TC-LNC performing flight TK-713 from Dhaka (Bangladesh) to Istanbul (Turkey), was enroute at FL360 east to west about 35nm southeast of Amritsar (India).
A listener on frequency reported it got hectic on the frequency for a while when ATC tried to reach two aircraft and issue resolving vectors repeatedly using the word "immediately". Then it got silent for a brief moment, then the Turkish crew could be heard reporting "clear of conflict".
TK-713 turned out of the airway to the north on ATC instruction trying to resolve the conflict, AI-9613 began a descent, however, not soon enough to avoid a TCAS Resolution Advisory activating in both aircraft instructing TK-713 to climb and AI-9613 to descend. AI-9613 descended to FL330 and continued the flight at FL330, while TK-713 returned to their assigned FL360 after climbing about 200 feet and subsequently turned back onto the airway.
Transponder data suggest that TK-713 had climbed to FL360 at 02:18Z about 90nm east of Delhi and 250 track miles to point of conflict, AI-9613 had reached FL360 at 02:39Z about 80nm south of the point of conflict. At 02:48:01Z both aircraft were maintaining FL360 on a conflicting heading at a closing speed of about 700 knots, the horizontal distance between the aircraft had reduced to 10.7nm. At 02:49:00Z the horizontal distance had decreased to 4.1nm, the vertical separation increased to 900 feet, the conflict was resolved soon after.
The listener reported that after both aircraft were clear of conflict a discussion went on on frequency that AI-9613 had been cleared only to FL330 (from the point of conflict it was about 110nm track miles to Jammu, and about 180-200 track miles from Delhi).
Both aircraft landed safely at their destinations.
This article is published under license from Avherald.com. © of text by Avherald.com.
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