On 18th March, 2020, Pakistan International Airlines (PIA) flight PIA785 B777-240(ER) aircraft Reg. No. AP-BGK was a scheduled passenger flight from Islamabad International Airport (OPIS), Islamabad, Pakistan to Heathrow Airport (EGLL), London, United Kingdom (UK) on Air Traffic Service (ATS) route via ISLAMABAD – KALMI – HANGU – LAJAK climbing FL340. Simultaneously, the reciprocal PIA flight PIA352, A320-214 aircraft Reg. No. AP-BLC was also a scheduled passenger flight operating from Quetta International Airport (OPQT), Quetta, Pakistan to OPIS, Islamabad, Pakistan on ATS route HANGU – J139 – KALMI – ISLAMABAD and was descending to FL150. Both aircraft encountered Traffic Collision Avoidance System (TCAS) –Resolution Advisory (RA) approximately 55 Nautical Mile (NM) West of Islamabad within Cherat Approach South Area of Responsibility (AOR) and maintaining their frequency. At the time of incident, there was 900 feet (ft) vertical and 6.6 NM lateral separation between the two aircraft. Pilots of both aircraft followed the TCAS-RA and resolved the situation as per Resolution Advisory protocols. Later, both aircraft continued to their destination without further incident.
