Single Engine Turboprop Undifferentiated
Flight Crew Commercial; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 50; Flight Crew Total 2100; Flight Crew Type 960
Communication Breakdown; Distraction
ATC Issue All Types; Conflict NMAC; Deviation - Altitude Excursion From Assigned Altitude; Deviation - Speed All Types; Deviation / Discrepancy - Procedural Clearance
General None Reported / Taken
Human Factors
I was under instruction for an annual re-currency. We were conducting a missed approach off of GPS 29R under visual conditions. My instructor simulated a rollback. NorCal asked us to turn to 260 which we acknowledged. Our speed had slowed; and possibly we lost some altitude while I was bringing the power back up using the emergency control toggle for the fuel control unit. As we were rolling to 260; an aircraft passed directly under us very closely. The aircraft was going faster than us at the time.I am not certain if the aircraft had us visually; perhaps this is what the NorCal controller was relying on. I believe we were not provided with adequate separation. I believe that we (the aircraft and my airplane) should have been given instruction to provide a larger degree of separation. One contributing factor could have been that we had slowed our airspeed during the simulated engine rollback maneuver. This was not communicated to ATC.
A single engine turboprop pilot reported a near-mid-air-collision while conducting a practice engine power loss during a missed approach.