A CRP APCH CTLR MONITORING A TRAINEE EXPERIENCES AN OPERROR.

Narrative

THE C210 WAS CLRED FOR AN ILS TO RWY 35 FROM ABOUT 15 MI S OF THE ARPT. THE BARON RPTED THE FIELD IN SIGHT FROM ABOUT 8 MI NE OF THE ARPT. THIS IS A COMMON 'TRAP' AT OUR FACILITY. I REMEMBER HAVING THE SAME TYPE OF SCENARIO WHEN I WAS IN TRAINING. IT IS VERY COMMON ON A N FLOW HERE. N FLOWS ARE NOT ALL THAT COMMON HERE; ESPECIALLY THIS TIME OF YR. WE HAVE A NAVY OUTLYING FIELD 5 MI SE OF CRP ARPT. THEY RUN A PATTERN AT OR BELOW 1500 FT MSL. SO; WE WILL CLR ACFT FROM THE NE FOR THE VISUAL APCH TELLING THEM TO MAINTAIN 2000 FT UNTIL ESTABLISHED ON A STRAIGHT-IN TO RWY 35. THE BARON DID EXACTLY THAT. THE PROB WHICH I KNEW AND TOLD THE DEVELOPMENTAL TO WATCH WAS THAT AT THAT ALT; ACFT TEND TO SWING S TO GIVE MORE DISTANCE FOR THE DSCNT. LIKE I WAS SAYING; AS SOON AS THE BARON RPTED THE FIELD IN SIGHT; I KNEW WHAT WOULD HAPPEN. I TOLD THE TRAINEE; 'THIS WILL BE CLOSE;' TRYING TO GET HIS ATTN. LATER; I TOLD HIM 'TAKE CTL OF YOUR VISUAL APCH;' THEN JUST AS I TOLD HIM TO TURN THE BARON TO THE HDG OF 330 DEGS; THE CONFLICT ALERT SOUNDED. THE TRAINEE IMMEDIATELY BEGAN ISSUING TFC TO THE C210. THE C210 NEVER SAW THE TFC; BUT RPTED HAVING HIM ON 'THE BOX.' THE DEVELOPMENTAL TURNED THE C210 OUT AND REVECTORED HIM TO THE ILS RWY 35. I SHOULD HAVE JUST TAKEN CARE OF THE SIT FROM THE BEGINNING; BUT THE TRAINEE WOULD NOT HAVE SEEN FIRST HAND THIS VERY COMMON TRAP ON A N FLOW. IT JUST DOESN'T GET WINDY FROM THE N HERE MUCH. THIS GUY IS ABOUT READY FOR CERTIFICATION AND REALLY IS CONSIDERED A GOOD TRAINEE. THIS PROBABLY LULLED ME INTO THINKING HE WOULD TAKE CARE OF IT WITH SUBTLE CLUES. I SHOULD HAVE INTERVENED ON FREQ FROM THE TIME THE BARON RPTED THE FIELD OR TOLD THE TRAINEE WHAT TO DO INSTEAD OF WAITING TO SEE WHAT HE WOULD DO. IT IS A FINE LINE AND ADMITTEDLY MY LACK OF TRAINER TIME SHOWED ITSELF TODAY.