Nct TRACON controller used insufficient spacing for an opposite direction operation at sck.

Attributes
ACN	1402845
Time
Date	201611
Local Time Of Day	1801-2400
Place
Locale Reference	NCT.TRACON
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Citation V/Ultra/Encore (C560)
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Visual Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	PA-28R Cherokee Arrow All Series
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Visual Approach
Flight Plan	VFR
Person 1
Function	Instructor Approach
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 6.0
Events
Anomaly	ATC Issue All Types Deviation - Procedural Published Material / Policy Deviation - Procedural Clearance

Narrative:

A C560; IFR; was cleared for the visual approach by my trainee to runway 29R while the active runway was runway 11L. I did not catch the incorrect issue and assumed the trainee got it correct given the aircraft proceeded to runway 11L once talking to the tower. A VFR P28R was inbound on the VFR practice approach to runway 29R. Upon further review; I had the incorrect understanding that [the P28R] only required 5 miles spacing and coordination with stockton tower for opposite direction procedures. Upon further review; [the P28R] required 10 miles spacing. As the instructor I did not catch the incorrect application of the opposite direction procedures with stockton tower and it is on me. This combined sector was extremely saturated with traffic and I was conducting OJT (on job training) when the incident occurred.I have been at nct for eight plus years and all too often we are required to work the combined sectors with heavy traffic; moderately difficult complexity; frequency congestion; and often not enough staffing for a radar assist position. This is the second 'significant event' at these sectors while combined in the past months. Nothing ever changes and we will probably still be working sectors combined long into my retirement but it is an unrealistic expectation to think one person working these sectors combined during heavy traffic saturation is really providing the best service to all the users within their airspace.

Original NASA ASRS Text

Title: NCT TRACON Controller used insufficient spacing for an Opposite Direction Operation at SCK.

Narrative: A C560; IFR; was cleared for the Visual Approach by my trainee to runway 29R while the active runway was runway 11L. I did not catch the incorrect issue and assumed the trainee got it correct given the aircraft proceeded to runway 11L once talking to the tower. A VFR P28R was inbound on the VFR practice approach to runway 29R. Upon further review; I had the incorrect understanding that [The P28R] only required 5 miles spacing and coordination with Stockton tower for opposite direction procedures. Upon further review; [the P28R] required 10 miles spacing. As the instructor I did not catch the incorrect application of the Opposite Direction Procedures with Stockton Tower and it is on me. This combined sector was extremely saturated with traffic and I was conducting OJT (On Job Training) when the incident occurred.I have been at NCT for eight plus years and all too often we are required to work the combined sectors with heavy traffic; moderately difficult complexity; frequency congestion; and often not enough staffing for a Radar Assist position. This is the second 'significant event' at these sectors while combined in the past months. Nothing ever changes and we will probably still be working sectors combined long into my retirement but it is an unrealistic expectation to think one person working these sectors combined during heavy traffic saturation is really providing the best service to ALL the users within their airspace.

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.