PA-44 Seminole/Turbo Seminole
Flight Crew Flight Instructor; Flight Crew Commercial; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 170; Flight Crew Total 800; Flight Crew Type 220
Aircraft Equipment Problem Critical
Air Traffic Control Issued New Clearance; Flight Crew Landed in Emergency Condition
Aircraft
I departed on a PA-44 training flight with a student. We did two laps in the pattern working on landings. After which we departed and headed towards the NE practice area. At approximately 2;500 feet I noticed the engine was running extremely roughly. Suspecting the mixture was too rich I pulled the mixture back (less than 1 cm) the engine failed at that point. I re-added the mixture but noticed no change in power. I ran the engine out and troubleshoot checklists to no avail. I turned the aircraft towards ZZZ and contacted Tower to let them know I was coming in. Tower [acknowledged the situation]; as I made a (fairly) straightforward approach and landing single engine. After landing the left engine was still running so I was able to taxi back to parking safely with no damage or injuries.
PA-44 instructor pilot reported an engine failure led to a single engine approach and landing.