SA-227 AC Metro III
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Last 90 Days 40; Flight Crew Total 7011; Flight Crew Type 40
Situational Awareness; Training / Qualification
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Rejected Takeoff; General Maintenance Action
Aircraft; Human Factors
I carried out an aborted takeoff due to excessive fluctuations in both EGT and torque on the right engine. I returned to our ramp facility and wrote the problem up as well my reason for the abort. Our Maintenance Department carried out a number of tests on the engine and concluded that the engine was bypassing fuel when it was not called for. They signed off on the corrective action section of the technical log and I returned to the runway for another take off attempt. I decided that I would minimize my torque settings in hopes of reducing or eliminating the fluctuations. The take off was normal but at approximately 400 FT AGL I again noticed large fluctuations in EGT and torque. I found that reducing the temperature to less that approximately 580 C would stop this but it had a detrimental impact on my climb capability. In the course of my climb and en route cruise I considered a diversion to the nearest suitable airport but elected not to do this as I felt I had found a power setting that resulted in relatively stable power. I continued on and landed without incident.
SA227 Captain rejected a takeoff for fluctuating EGT and fuel flow and returning to the ramp for maintenance. Maintenance determines that the engine is bypassing fuel for unknown reasons and signs of the log book. The next takeoff produces the same results but the takeoff is continued and the aircraft is flown to destination with reduced power on the right engine.