THE FLC FAILED TO TURN AT THE REQUIRED TURNING POINT. THE FLC DEVIATED 400 FT OFF ASSIGNED ALT.

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FLT SEGMENT WAS FAT TO ONT. IMC ENRTE; FO WAS HAVING TROUBLE HOLDING ALT AND COURSE. NO TURB; LIGHT RIME ICING. I HAD TO CONTINUALLY REMIND FO TO MAINTAIN ALT OR COURSE. FO HAS 'REPEATERS' FOR INSTS AND THEY TAKE A WHILE TO GET USED TO. EVERYONE MANAGES THOUGH. IT WAS MENTALLY DRAINING HAVING TO ACT AS FLT INSTRUCTOR FOR 40 MINS AND WHEN WE WENT VMC I BECAME VERY RELAXED. THAT IS HOW THE PROB AROSE. AT THAT POINT I WAS SO DRAINED THAT I FAILED TO MONITOR THE PROGRESS OF THE FLT. WE PASSED HITOP BY 7 MI AND WERE REPRIMANDED BY SOCAL APCH. THEN WE DEVIATED FROM ALT; 400 FT LOW; IN THE RESULTING CONFUSION. ALL IN VMC. AS IT TURNS OUT THE FO ONLY HAD 26 HRS OF INST TIME; AND NO TIME AS A FLT INSTRUCTOR. THAT IS A SEVERE DISADVANTAGE IN A COMMUTER ENVIRONMENT. MYSELF; I AM A NEW CAPT AND HAVE MY HANDS FULL ANYWAY JUST GETTING PROCS HONED; ETC. THESE DEVS OCCURRED AS A RESULT OF MY FAILURE TO MONITOR THE PROGRESS OF THE FLT. CONTRIBUTING FACTORS WERE: PAIRING UP A NEW FO WITH A NEW CAPT. PAIRING UP A WEAK FO WITH A NEW CAPT. TO KEEP THIS FROM OCCURRING AGAIN; I WILL BE MORE VIGILANT DURING ALL PHASES OF FLT VMC OR IMC; AND WORK WITH THE FO TO GET HER UP TO SPD ON INSTS.