On 9 May 2019, a Cessna 550 level at FL 350 experienced an unexplained left engine rundown to idle and the crew began descent and a diversion to Savannah. When the right engine also began to run down passing 8000 feet, an emergency was declared and the already-planned straight-in approach was successfully accomplished without any engine thrust. The ongoing Investigation has already established that the likely cause was fuel contamination resulting from the inadvertent mixing of a required fuel additive with an unapproved substance known to form deposits which impede fuel flow when they accumulate on critical fuel system components.
Description
On 9 May 2019, the crew of a Cessna 550 Citation 2, (N744NT) being operated by Air Ambulance By Air Trek on a non-scheduled aeromedical flight from Naples FL to Niagara Falls NY and in the cruise at FL 350 in day VMC began to observe a loss of thrust from the left engine and decided to turn back to Savannah GA which they had recently passed. During what became a single engine descent, the right engine also began to run down to idle. An emergency was declared and the already-planned straight-in approach was successfully accomplished without engine thrust and the aircraft was then towed off the runway.
Investigation
An Investigation is being carried out by the National Transportation Safety Board (NTSB). It was noted that prior to takeoff from Naples with a two pilot crew, two other crew members and three passengers on board, the aircraft had been positioned from its base at Punta Gorda FL where 480 gallons of fuel had been uplifted. The 47 nm sector from Punta Gorda to Naples was accomplished without event as was the climb to cruising altitude and the initial cruise at FL350 on the intended flight to Niagara Falls.
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