NMAC IN THE CLASS C AIRSPACE BTWN A CLBING IFR COUGAR AA7 AND A VFR CHEROKEE IN LEVEL FLT 13 NM SE OF THE SAT VOR; TX.

Narrative

THE SIT OCCURRED DURING AN ATP TRAINING FLT FROM SAT ARPT TO STINSON VOR. WE WERE CLBING THROUGH 2700 FT MSL ON OUR WAY TO 3000 FT MSL; WHEN I HEARD A CALL OVER THE RADIO ANNOUNCING A 'NMAC.' MY STUDENT WAS UNDER A HOOD AND I WAS KEEPING WATCH FOR TFC. THE CHEROKEE WAS NEVER VISIBLE TO ME AS IT CROSSED BELOW THE L SIDE OF OUR ACFT. OUR ACFT ALSO HAD A PAX ON BOARD (AN ATP PLT) WHO WAS ALSO WATCHING FOR TFC. MR X WAS SITTING ON THE R SIDE OF THE PLANE AND ONLY VIEWED THE CHEROKEE AS IT WAS BANKING BEHIND US. ATC RPTED TO THE OTHER ACFT; WHO MADE THE 'NMAC' CALL; AND SAID THEY WERE 500 FT BELOW US. NO TA'S WERE MADE; AND ATC INITIALLY QUESTIONED THE CHEROKEE AFTER THE FIRST CALL ABOUT WHO THEY WERE TALKING TO (SAT APCH OR STINSON TWR). SUPPLEMENTAL INFO FROM ACN 572551: I NOTICED A WHITE FLASH IN MY PERIPHERAL VISION BTWN L ENG AND FUSELAGE. I OBSERVED A LOW WING CHEROKEE-TYPE ACFT APPROX 150 FT BELOW AND AFT OF THE L ENG IN A BANK AWAY FROM OUR POS. WE WERE CLBING AT APPROX 700 FPM ON A VECTOR TO SSF. THE CHEROKEE WAS NEVER POINTED OUT TO US FOR TFC.