A single engine turboprop pilot reported a near-mid-air-collision while conducting a practice engine...

Attributes
ACN	1450261
Time
Date	201705
Local Time Of Day	1201-1800
Place
Locale Reference	SCK.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Single Engine Turboprop Undifferentiated
Operating Under FAR Part	Part 91
Flight Phase	Climb
Route In Use	Other Missed Approach
Flight Plan	None
Aircraft 2
Make Model Name	Small Aircraft Low Wing 1 Eng Fixed Gear
Operating Under FAR Part	Part 91
Flight Phase	Climb
Person 1
Function	Pilot Flying
Qualification	Flight Crew Commercial Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 50 Flight Crew Total 2100 Flight Crew Type 960
Events
Anomaly	ATC Issue All Types Conflict NMAC Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Speed All Types
Miss Distance	Horizontal 5 Vertical 300

Narrative:

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.

Original NASA ASRS Text

Title: A single engine turboprop pilot reported a near-mid-air-collision while conducting a practice engine power loss during a missed approach.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.