On 24 November 2018, PIAC aircraft ATR 72-212A Reg No AP-BKW at JIAP Karachi, after both engines replacement and scheduled Check-A inspection, was undergoing engines’ performance ground run-up, as a follow up of the completed maintenance. The aircraft was parked at engine run-up bay No 01. During engines’ performance check at maximum reverse setting, the aircraft initially moved backward by about 10 feet and then, because of wrong selection of the engine controls, it started moving forward. The aircraft did not stop with parking brakes (already ON) as well as with the application of pedal brakes. The wheel chocks used during the activity were of smaller than the recommended size. The maintenance engineer could not control the situation and the aircraft continued forward movement. It’s left wing tip first made contact with a dormant / parked aircraft (SAI B737-400, Reg No AP-BJT) between Captain and First Officer’s windshield. After this it continued moving forward and hit the nose radome of another dormant / parked aircraft (SAI B-737-400, Reg No AP-BJU). Subsequently, the rotating No 1 Engine propeller got embedded into the fuselage of second parked aircraft, and it came to a stop after about 450 feet. The collision of AP-BKW with the two parked / dormant aircraft resulted in substantial structural damage. The aircraft last operated flight was PK-537 (Mohenjo-Daro to Karachi) on 31 August 2018 (84 days prior to this accident).
