PLTDEV WHILE CONDUCTING MISSED APCH PROC WITH INSTRUCTOR PLT.

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I WAS CONDUCTING A TERRAIN FLT FOR ONE OF OUR PLTS. HE WAS RECEIVING RADAR VECTORS FROM THE APCH CTLR FOR AN ILS RWY 27 APCH. HE RECEIVED CLRNC FOR THE APCH AT 6 MI ON DOGLEG TO FINAL WITH THE MISSED APCH INSTRUCTIONS OF 'CLB TO 2800 FT; TURN L TO 230 DEGS.' AT 2 MI FROM THE MARKER I COVERED THE ALT INDICATOR AND THE HSI (#1 NAV) AND WE CONTINUED THE APCH AS A PARTIAL PANEL APCH. AT ABOUT A 3 MI FINAL AND 1000 FT AGL HE HAD A FULL SCALE DEFLECTION ON THE #2 INDICATOR SO HE INITIATED A MISSED APCH. THE PLT HESITATED ABOUT 1 SECOND AND THEN STARTED RETRACTING THE LNDG GEAR AND FLAPS AND ADDING PWR. UNDER THE CARD I USED TO COVER THE FLT DIRECTOR AND HSI I COULD SEE WE WERE TURNING R. THE TURN COORDINATOR ALSO SHOWED A R TURN SO I ENCOURAGED THE PLT TO LOOK AT THE TURN COORDINATOR AND HE STARTED TO CORRECT FOR THE WRONG DIRECTION FO TURN. FROM THE TIME HE ADDED PWR; WE WERE CLBING AT ABOUT 600-800 FPM. AFTER ABOUT 10-12 SECONDS I PULLED THE CARD OFF THE HSI ONLY TO FIND OUR HDG AT 060 DEGS. THE CTLR ASKED US OUR HDG AND BEFORE THE PLT COULD ANSWER THE CTLR ASSIGNED OUR NEW HDG OF 030 DEGS AND CLB TO 3000 FT WITH NO DELAY. TFC WAS A DC-9 ON A 5 MI FINAL. THERE WAS NO TFC SEPARATION PROBS. I HAD NO IDEA WE HAD TURNED THAT MUCH. I GUESS IT WOULD HAVE BEEN BETTER TO DO THIS TYPE OF TRAINING IN VFR CONDITIONS. THE CTLR REQUESTED A PHONE CALL AND ASKED ABOUT THE FLT. I CALLED AND EXPLAINED AND NO MORE WAS SAID.