Date:	Wednesday 18 March 2020
Time:	08:36 UTC
Type:	Boeing 777-240ER
Owner/operator:	Pakistan International Airlines - PIA
Registration:	AP-BGK
MSN:	33776/469
Year of manufacture:	2004
Fatalities:	Fatalities: 0 / Occupants:
Other fatalities:	0
Aircraft damage:	None
Category:	Serious incident
Location:	55 nm West of Islamabad -   Pakistan
Phase:	En route
Nature:	Passenger - Scheduled
Departure airport:	Islamabad International Airport (ISB/OPRN)
Destination airport:	London-Heathrow Airport (LHR/EGLL)
Investigating agency:	BASI Pakistan
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
PIA flight PK352, an Airbus A320-214 (AP-BLC), and PIA flight PK785, a Boeing 777-240ER (AP-BGK), were involved in a serious airprox incident.

Flight PIA785 was following ATS routing via ISLAMABAD – KALMI – HANGU – LAJAK climbing to FL340. Simultaneously, the reciprocal flight PIA352, was also on ATS route HANGU – J139 – KALMI – ISLAMABAD and was descending to FL150.
Both aircraft encountered a 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.
The incident was observed by Islamabad Approach Controller on his Situation Data Display (SDD).

Cause
1. Activation of TCAS – RA (MAC – Mid Air Collision) due to inadequate separation management by Cherat Approach South Controller.
Contributory Factors
1. Simultaneous unrestricted climb and descent instructions given to aircraft on reciprocal tracks.

OPIS 180825Z 27008KT 6000 FEW040 26/12 Q1015 NOSIG

BASI Pakistan

Date/time	Contributor	Updates
20-Sep-2025 13:35	ASN	Added