Regional Jet 900 (CRJ900)
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Troubleshooting
Aircraft Equipment Problem Critical; Inflight Event / Encounter Other / Unknown
Air Traffic Control Provided Assistance; Air Traffic Control Issued New Clearance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Returned To Departure Airport; Flight Crew Inflight Shutdown
Aircraft
During pre-flight review of the logbook; I noticed the Oil Temperature had been written up multiple times; and OCF (Operational Check Flight) had failed; and the right engine had been replaced. I brought this to the CA's (Captain's) attention so we could both monitor the engine oil temperatures during the flight. After we joined the departure; and were passing through 10;000 ft.; I observed the oil temperature at 130 degrees. I brought this to the CA's attention and had requested me to review the High Oil Temp QRH. While I was reading through the QRH; we both watched the oil temperature continue to climb. Even as the CA was complying with the QRH and reducing power on the affected engine; the oil temperature would not stop rising. By the time we finished the QRH; the right engine was at flight idle and the oil temperature was still climbing. At that time; the CA called for the Intentional Shutdown QRH. We worked through this checklist and complied with all items as well as the subsequent; single engine descent and single engine landing checklist. The landing was uneventful. We taxied to the gate. With the oil temp having been written up multiple times; we were concerned about this being an issue on the flight. But having recently been brought from [maintenance]; there was nothing to refuse. Also the engine had been replaced and ops checked with a ground run. The CA and I decided the continuous monitoring of the oil temp was our only available mitigation tool.
CRJ90 First Officer reported intentional engine shutdown in flight due to rising oil temperature and a single engine landing.