Nct controller described a loss of separation event between a sfo arrival and a sjc departure; the r...

Narrative:

I was working the san francisco final. I turned a turboprop to a 330 or 310 heading from a northeast bound heading. The pilot acknowledged it but didn't turn right away. I started looking at the next aircraft; and noticed the turboprop didn't turn. I again issued a turn to 310 immediately. The pilot didn't reply; it is possible that the transmission was blocked. I again issued an immediate left turn to 310 to the turboprop (3rd time). He acknowledged it. Around the same time a B737 was departing from sjc. The turboprop and the B737 came within about 2.5 miles of each other; the conflict alert sounded but not until I had taken action to separate the two aircraft. If the turboprop had turned when I told him to; there would have been no loss of separation. I consider this event a pilot deviation. The san francisco final is busy with arrivals most times of the day. In this example we were in trail; which means delays; a full final for most of the day; well into the night. To work the final you must time your turns at the right moment. What I was doing was normal and appropriate; the turboprop should have turned when I told him.

Original NASA ASRS Text

Title: NCT Controller described a loss of separation event between a SFO arrival and a SJC departure; the reporter alleging the SFO arrival failed to turn as directed even after three turns were issued.

Narrative: I was working the San Francisco final. I turned a turboprop to a 330 or 310 heading from a northeast bound heading. The pilot acknowledged it but didn't turn right away. I started looking at the next aircraft; and noticed the turboprop didn't turn. I again issued a turn to 310 immediately. The pilot didn't reply; it is possible that the transmission was blocked. I again issued an immediate left turn to 310 to the turboprop (3rd time). He acknowledged it. Around the same time a B737 was departing from SJC. The turboprop and the B737 came within about 2.5 miles of each other; the conflict alert sounded but not until I had taken action to separate the two aircraft. If the turboprop had turned when I told him to; there would have been no loss of separation. I consider this event a pilot deviation. The San Francisco final is busy with arrivals most times of the day. In this example we were in trail; which means delays; a full final for most of the day; well into the night. To work the final you must time your turns at the right moment. What I was doing was normal and appropriate; the turboprop should have turned when I told him.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	892321
Time
Date	201006
Local Time Of Day	1801-2400
Place
Locale Reference	NCT.TRACON
State Reference	CA
Aircraft 1
Make Model Name	Medium Transport
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Route In Use	Vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Deviation - Procedural Published Material / Policy

Nct controller described a loss of separation event between a sfo arrival and a sjc departure; the reporter alleging the sfo arrival failed to turn as directed even after three turns were issued.