Maintenance Airframe; Maintenance Powerplant
Communication Breakdown
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural MEL / CDL
Aircraft Aircraft Damaged; General Flight Cancelled / Delayed; General Maintenance Action
Aircraft; Procedure
ZZZ MX (Maintenance) called and informed that the LH eng took 19 Quarts. MX inspected the inside and outside of the eng cowl and eng; tailpipe; inlet and behind fan blades with no evidence of a leak. The inbound crew did not write up a problem with the oil QTY. We reviewed AHM (Automated Health Monitoring) report with was posted inflight an hour prior to landing and showed good QTY and oil pressure and no high oil temp. We reviewed the oil service screen in work bench and no servicing has been done for a while which showed no oil consumption issues. We asked to MX service the oil tank and run the engine; no leaks found and a good oil gulp at start which tells us the tank is not over serviced. We put the engine oil qty on MEL for two reasons one that the oil qty transmitter was giving false readings and MX may have thought when they checked the gauge in the cockpit that the engine was full and that's why the oil screen also showed very little oil servicing of the engine. Second reason is that by putting the engine on MEL that forces the mechanic to check oil at the tank and document it. There for showing if we truly have an oil consumption problem. We monitored the take off and looked at the takeoff report and it showed good oil qty and pressure. About an hour later we got a report of the engine having high oil temp. We looked at AHM; it did show a high oil temp with oil Qty and pressure good. On post landing at ZZZ1 MX did a look at the engine and once again no leaks found. With the oil temp high that's when we asked them to pull the master oil chip detector and it had metal shavings on it. With the oil temp over limit that requires an engine change.I'm not sure we can prevent this kind of failure this was a really oddball problem we have not seen before. I think we were a victim of a failing lube and scavenge pump or gearbox the oil may have been hiding in the gearbox. If we were to do this again I may have asked MX to do a high power run instead of just an idle run; But it may not have shown the problem.
Maintenance Technician reported excessive oil consumption was addressed by placing an oil monitor MEL on the aircraft; after which high oil temp and metal found on the oil scavenge screen/main chip detector required an engine change.