Date: 202104
Local time of day: 1201-1800
Location: ZZZ.TRACON, US
Flight conditions: VMC
Weather elements / visibility: 10
Light: Daylight
Aircraft: Citation I/SP (C501)
Operator: Personal
Operating under: Part 91
Flight plan: IFR
Mission: Personal
Flight phase: Initial Approach
Airspace: Class B ZZZ
ATC / advisory: TRACON ZZZ
Aircraft component: Engine
Component problem: Malfunctioning
Reporter organization: Personal
Reporter function: Pilot Not Flying
Reporter qualification: Flight Crew Multiengine; Flight Crew Sea; Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Instructor; Flight Crew Instrument; Other sea plane
Human factors: Troubleshooting; Communication Breakdown; Situational Awareness
Anomaly: Aircraft Equipment Problem Critical; Airspace Violation All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Automation Aircraft Other Automation; Person Flight Crew
When detected: In-flight
Result: Air Traffic Control Provided Assistance; Flight Crew Inflight Shutdown; Flight Crew Landed in Emergency Condition; Flight Crew Overcame Equipment Problem; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Returned To Departure Airport; General Maintenance Action; General Flight Cancelled / Delayed
Contributing factors: Human Factors; Aircraft; Procedure
Primary problem: Aircraft

Narrative: Name; owner of a Cessna 501 hired a pilot to fly the plane and move it to another airport for maintenance. The aircraft had been sitting in a hanger for some time. A local A&P completed some maintenance on the aircraft to prepare it for flight. The airplane was ramp checked with the mechanic present and all of the systems were working properly. The airplane is equipped with a transponder and Mode C. A request for a non ADSB flight leaving the area was filed and granted. The paperwork was on board. There was a unintentional mistake on the printed form and a extra character was included in the tail number. Name; together with the pilot boarded the plane and departed ZZZ around XA:10. The plane was given a squawk code and it was entered into the transponder. Approximately 8-10 minutes into the flight; the right engine oil pressure registered low on the gauge. The low oil pressure alarm sounded. The emergency procedure checklist was used and the engine was shut down. The plane turned back towards the departure airport. Two way communication with the controller handling the plane was lost. The plane descended and tracked off course to the south. Attempts by the pilot with made to contact the controller without success. The controller noticed the airplane off course and was heard on the radio attempting to establish two way contact with the pilot. This was unsuccessful. The plane entered Class B airspace without permission. The controller requested a squawk ident and a turn to the north. The pilot complied with the request. The controller vectored the plane back to ZZZ and handed it off [to] Tower. Tower cleared the pilot to land and taxi to parking. The plane landed and parked. Two way radio communication was never re-established.




Synopsis: Pilot reported that during a flight to another airport for maintenance; the aircraft had an engine lose power and was shut down; and communications were lost with ATC.