Cessna 402/402C/B379 Businessliner/Utiliner
Flight Crew Private; Flight Crew Instrument; Flight Crew Commercial
Workload; Confusion; Distraction; Troubleshooting
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Diverted; Flight Crew Landed As Precaution; Flight Crew Returned To Departure Airport
Aircraft
On my ATP checkride; after completion of steep turns; stalls; and a simulated in flight engine failure; completion of box memory items and QRH checklist; check airmen deemed the maneuver satisfactory and restored engine power. Upon restoration of engine power the engine began to run rough intermittently. Upon realization it was not an action of the check-airmen or myself we agreed to pause the check-ride to work together to determine the issue. We tried various power settings and adjusted the mixtures in attempt to resolve the engine roughness and could not identify which engine was running rough as all indications were normal. As PIC during the check ride I determined the best course of action was to return to ZZZ to a full stop and discontinue the checkride.
C402C pilot reported a simulated engine failure during an FAA check ride. After the demonstration; engine power was not able to be restored.