The Plane That Was Destined To Crash | Pakistan International Airlines Flight 661

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ATR42 Image: Asuspine - http://www.airliners.net/photo/Pakistan-International-Airlines/ATR-ATR-42-500/1848665/L/
Propeller Images: Julian Herzog and Vivan755 On Wikimedia Commons
This is the story of Pakistan international airlines flight 661. On the 7th of december 2016 an ATR 42-500 was flying from chitral airport to islamabad in pakistan. Todays flight would have one captain and two first officers and 42 passengers on board. One of the first officers was being trained on this route. The plane took off from Chitral at 10:38 am the first officer was the one at the controls. The plane climbed albeit a bit slowly the Atr 42 usually climbed at 160 knots but today it was lagging a bit behind at 145 knots. At 10:45 am the plane levelled off at 13,500 feet and the crew and the passengers settled in for the journey. As the plane cruised the captain took over flying duties from the first officer.

As the plane cruised at 186 knots at 13,500 feet the captain started to make an announcement at 11:04 am, he was interrupted by a warning, A pec or propeller electronic control- 1 warning for the left hand engine appeared. The first officer lets the captain know and the fault was acknowledged by the captain. The captain called for the QRH or the quick reference handbook and summoned an engineer who was a passenger on this flight as the pilots did this they also brought back power on the left hand engine the plane slowed down to 146 knots. They were trying to reset the Propeller electronic controller, they much like us hoped that turning it off and then turning it back on again would solve the issue. But it didn't the captain wanted to do the checklist to reset the PEC again. They tried resetting the PEC 3 times with no luck. By 11:10 am the engineer joined the discussion in the cockpit. The right hand engine was holding steady at 82% but the left hand engine was all over the place. At first it was around 82% then it dropped to 62% then it climbed to 69%. It was as if the left hand engine had a mind of its own.

At 11:10 am a sound was heard from the left hand engine and torque from the left hand engine dropped to 0. The left hand engine had failed. The captain said “engine gone”, the pilots carried out the single engine operating procedure and as a part of that the captain pulled back power on both engines. The propeller speed of engine number 1 or NP-1 was quite high it was at 102%, this caused some asymmetric drag on the left side of the plane, sure when you lose an engine you expect the broken engine to produce some drag but the drag by this engine was well beyond what anyone had expected, three times as much to be precise, the autopilot held the plane.. For now. The condition lever was moved to the fuel shut off position. The propeller speed started to drop and it was down to less than 30%, the captain increased power on the left hand engine. At 11:11 am The crew wanted a lower altitude and they put out a mayday call. The propeller speed for engine number one was at 25% as expected. But it didnt stay there. Soon it started to rise soon it was at about 125%, the rise in the speed of the number one propeller went unnoticed, they only noticed it when they picked on the noise from engine number 1. Soon after that the autopilot disengaged. The captain struggled to keep the plane under control. The plane at this point was close to a stall, The speed had dropped to 127 knots and they were descending. The plane turned left as it lost altitude and airspeed. The captain was trying his best to turn the plane to the right but it was stuck in this left turn. The stall warning came on again and the stick shaker activated. The crew were confused; they tried to feather the left engine and maybe they even attempted a restart. The power on engine number 2 was increased and the captain commanded right rudder right as the speed on the engine one propeller dropped. Without the drag from the left engine forcing them into a left hand turn the plane was now in a right turn and the plane stalled. The plane was uncontrollable at this point

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