Citationjet (C525/C526) - CJ I / II / III / IV
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Troubleshooting; Time Pressure
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Provided Assistance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Landed in Emergency Condition; Flight Crew Inflight Shutdown; General Flight Cancelled / Delayed; General Maintenance Action
Aircraft
Engine 1 failed during the descent to ZZZ. We complied with the QRH for engine low oil pressure and completed an inflight engine shutdown. We received priority with ATC and requested to divert to ZZZ1. The Pilot Not Flying completed all QRH procedures and Pilot Flying handled the radios and aircraft control. The descent; approach; and landing were uneventful; and the aircraft was met on the ground by Airport ARFF (Airport Rescue and Firefighting) crews. After ARFF completed an aircraft walk around; we proceeded to FBO for passenger unloading.
During cruise we got a Master Warning/Caution for oil pressure left side. Oil pressure was low; in the red. Other annunciations came on as engine was failing. We descended at low power setting. We ran the checklist and decided to shut down and secure the left engine. We requested priority handing and diverted to ZZZ1. We performed a single engine approach checklist and flew the ILS [Runway] XXL approach and landed. After getting checked out by ARFF (Airport Rescue and Firefighting) we taxied to the FBO.
C525 flight crew reported loss of oil pressure on #1 engine and elected to perform an inflight shut down and diverted to the nearest suitable airport.