B757 flight crew reported noticing a speed loss and realizing that the Engine #2 was not producing the correct amount of power. After troubleshooting and contacting Dispatch and Maintenance; the flight crew diverted to an alternate airport.
Synopsis
B757 flight crew reported noticing a speed loss and realizing that the Engine #2 was not producing the correct amount of power. After troubleshooting and contacting Dispatch and Maintenance; the flight crew diverted to an alternate airport.
Narrative
Cruising at 34000 ft. just south of ZZZ1 I noticed a speed loss. We were slower than the .79 Mach as planned. I looked and the number 2 right engine was not producing the required set power. The number 1 engine was producing 1.78 EPR (Engine Pressure Ratio) while Engine 2 was set at the same but only producing 1.32 EPR. The power levers were both up at the commanded position. We tried to reset the autothrottles but it had no effect. We also tried to get more power pushing the thrust lever up to max with no avail. I made a call to Dispatch and company Maintenance via SATCOM. We decided to divert and with working with Dispatch and Maintenance we chose ZZZ in front of us. Good weather and long runways. We arrived at ZZZ Airport. However; we were over max landing weight. We chose to burn fuel down to max landing weight. We held at ZZZZZ for about 20 minutes. We then flew the ILS Y XXR into ZZZ. An uneventful landing was made at landing weight of 198.00. We taxied to the gate without incident.
Second reporter narrative
As we were cruising at FL340 we noticed a decrease of the commanded Mach number from 0.79 to 0.76 and a the engine right indications displayed a degraded performance from the commanded Engine Pressure Ratio (EPR) of 1.78 to 1.28. We attempted to advance the right throttle to increase the EPR with the autothrottle engaged and disengaged but the response was not adequate to the input. I continued monitoring the flight path of the aircraft and communication with ATC as the Captain contacted Dispatch and Maintenance Control. As crew we decided to divert to ZZZ and after about 20 minutes of fuel burning over the airport we landed uneventfully.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.