been improperly installed by Millenium. The protective fairings of the tube had been installed in a way that was not in conformance with the correct standard that had been issued by Pratt & Whitney Canada, causing the fuel lines to be severed. Faulty maintenance Pratt & Whitney Canada was fully aware on the possibility of the secondary fuel manifold fractures. The fractures would have resulted in fuel leaks, causing significant problems for flights. In one instance, in 2001 there was a reported engine fire due to the issue. As such, Pratt & Whitney issued a service bulletin to fix the problem. In October 2003, Pratt & Whitney addressed all operators to replace or modify the secondary fuel manifold with new tube material. The new tube would have reduced the occurrence of fractures due to the significantly greater fatigue life. According to the history of the aircraft's engine, the right engine had been overhauled in accordance with the bulletin by Volvo Flygmotor in 2005. At the time, the engine was still in operation with Alaska Airlines. The left engine, however, was not overhauled. It was sold to Dana Air in its original condition. The left engine was eventually overhauled by Millenium Engine Associates Inc in August 2011. The right engine was eventually overhauled by Millenium as well in September 2011. Both of the overhauls, however, were not carried out in accordance with the bulletin. The company also installed the manifold incorrectly, putting more bending stress on the secondary manifold inlet tubes. The installation of the fairing, a part of the manifold, was also not in accordance with the correct procedure. Due to the procedure, the fairing was not sealed tight. The loose fairing remained open to the side. Following the combustion of fuel, the engine created hot air. The loose fairing then caught the bypassing air and acted like a sail, creating significant drag. The fuel inlet tube was then pulled by the loose fairing. Combined with the bending stress that had been put by the improper installation of the fuel manifold, the unchanged tube material of the fuel manifold, and the exposure of hot air, the fuel inlet tube eventually cracked. The fuel lines inside the tube then collapsed, causing significant drop of fuel flow. The reduction of fuel flow eventually caused the slow acceleration of the aircraft. Investigators however could not explain why the right engine had also suffered