On 01st November 2018, Turkish Airlines Flight No THY 714E, aircraft A333, Reg No TCLOE was maintaining FL390 & operating from Istanbul to Lahore (LTBA - OPLA) on route N644 / A466 (DOBAT- REGET- D I KHAN - JHANG). At position DI Khan (DI) aircraft requested descend clearance. THY714E was given descend by Area Radar Controller West to FL370 and traffic information was passed about Singapore Airline Flight No. SIA346, aircraft A388, Reg. No. 9VSKU, operating from Singapore to Zurich (WSSS - LSZH) maintaining FL360. During the course, Area Radar Controller West realized the conflict of THY714E with another reciprocal traffic Royal Brunei Flight No. RBA003, aircraft B788, Reg No. VBDLB, operating from Brunei to London (WBSB - EGLL) which was maintaining FL380. Area Radar Controller West tried to take evasive action by assigning radar vectors/ headings to both the flights, however both THY714E and RBA003 received Traffic Collision Avoidance System - Resolution Advisory (TCAS - RA) and initiated climb and descend respectively.
