PA-44 Seminole/Turbo Seminole
Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Multiengine; Flight Crew Instrument
Flight Crew Last 90 Days 100; Flight Crew Total 1650; Flight Crew Type 210
Aircraft Equipment Problem Critical
Air Traffic Control Provided Assistance; Flight Crew Landed As Precaution; Flight Crew Returned To Departure Airport; General Maintenance Action
Aircraft
My student was attempting to restart the right engine after performing maneuvers with one engine inop with the right propeller feathered. Upon reaching the checklist line item prop full forward; the propeller twitched but did not come out of the feather position. CFI tapped the starter button unsuccessfully to try to get it to start spinning. When that failed CFI took control of the airplane and unsuccessfully tried cranking the starter several more times for several seconds. CFI then requested priority handling from ZZZ Approach and informed them that we were going back to ZZZ1. We were told to remain on current squawk code and contact tower. ZZZ1 tower cleared us for straight in [Runway] XX and cleared us to land. Aircraft was landed uneventfully and taxied back to Company's ramp. Student was very helpful with assisting on checklists and looking for traffic; showing good CRM.
Flight Instructor reported that during engine out training; the propeller would not come out of feather and the engine would not restart; causing a return to departure airport and a precautionary landing.