2022-06 · NASA ASRS report 1909562
B757-200 flight crew reported unreliable engine indications from the right engine. The flight crew elected to descend to run checklists where a decision to divert for a precautionary landing was made.
During cruise at FL380 on our ZZZ1-ZZZ2 flight; we noticed a problem with the right engine. The right Engine Pressure Ratio (EPR) gauge was near the top of the scale; the right fuel flow indication was less than half of the left engine; and all the remaining right engine gauges were significantly lower than the left. There was a large split in the thrust levers. We were unable to hold airspeed at FL380; so we advised ATC of our right engine problem and coordinated with them to descend to FL320 where we were able to hold airspeed. Although; the right engine instruments still had the same large discrepancies compared to the left at FL320. We had no EICAS messages; no exceedances; no other failure indications; and the engine was producing good thrust. Under these circumstances; there were no appropriate Quick reference Checklist (QRC) or Quick Reference Handbook (QRH) procedures to accomplish at the time. After discussion; we decided that we would [request priority handling] and land as soon as possible with the real risk of the engine situation getting worse. We coordinated with Operations to examine our divert options; etc... We decided ZZZ3 was the best option with given the circumstances. We were close to ZZZ3. We [requested priority handling] with ATC and coordinated with them on the divert and descent into ZZZ3. We noted some vibration in the right thrust lever during descent. Descending through approximately 10000 ft.; all the right engine instruments started indicating normal and were married up the left engine instruments. We continued to a safe and uneventful landing at ZZZ3. Mechanical/Indications malfunction. Aircraft currently under repair.
[Narrative contained no additional information.]
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.
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