OWNER AND FO OF A LEARJET 25 LOST CTL OF THE ACFT IN A TURN RESULTING IN AN ALT EXCURSION AND OVERSHOOTING THE ASSIGNED HDG. THE CAPT TOOK THE CTLS AND RETURNED THE ACFT TO THE ASSIGNED HDG AND ALT. AN EXTRA PLT WAS ALONG AND HELPING WITH MONITORING ALL OPS AND WAS INVESTIGATING A BLEED AIR PROB.

Narrative

THE PF IS COMPANY PLT WITH CLAIMED FLT TIME OF 5000 HRS IN TURBOPROP ACFT AND HAS VERY INADEQUATE PLTING SKILLS. HE IS WORKING TOWARD A TYPE RATING IN THIS ACFT AND HAS BEEN THROUGH THE IOE. I HAVE NOT WORKED FOR THIS COMPANY VERY LONG. WE WERE CLBING OUT OF TPA AT APPROX 10000 FT WHEN A RED 'BLEED AIR' LIGHT CAME ON. WE WERE CLRED TO FL270. I WAS TROUBLESHOOTING THE PROB AND DECIDED TO RETURN TO TPA. CTR CLRED US TO TPA TO MAINTAIN FL250 AS WE WERE PASSING FL255 AND GAVE US A HDG OF 270 DEGS FOR VECTORS TO TABIR INTXN ON THE DARBS 1 ARR. PF WAS LEVELING ACFT AT FL250 AND STARTING TURN TO 270 DEGS AS I WAS SETTING UP FMS FOR THE ARR. I LOOKED UP TO CHK HIS PERFORMANCE AND SAW HIM BANKING THE ACFT PAST A 45 DEG BANK ANGLE WITH NOSE DROPPING THROUGH FL247. I TOOK OVER THE CTLS AND STOPPED THE DSCNT AT FL245; AND WHILE CLBING BACK TO FL250 I OVERSHOT BY 300 FT AND THEN LEVELED AT FL250 ON THE PROPER HDG. I TURNED AUTOPLT ON AND FINISHED SETTING UP FMS AND FAILED TO SET PROPER BEARING ON HSI; WHICH WAS 40 DEGS OFF THE PROPER HDG FOR INTERCEPT OF ARR. ONE REASON FOR THIS PROB IS THAT THE HSI IS AN ANALOG INST AND DOES NOT AUTOMATICALLY SLEW TO THE PROPER BEARING. THE BEARING ON THE HSI MUST BE MANUALLY SET. WE HAVE BEEN HAVING AN EXTRA QUALIFIED CREW MEMBER RIDE IN JUMP SEAT TO HELP OVERSEE THIS OP; AND HE WAS BUSY HELPING TO TROUBLESHOOT THE BLEED AIR PROB; SO BOTH OF US HAD OUR HEADS DOWN AND NOT MONITORING THE PF AND ACFT. CTR GAVE US VECTORS TO ARPT WITH REST OF FLT UNEVENTFUL. I HAVE DECIDED THAT THIS PLT WILL NOT FLY THE ACFT WITHOUT AT LEAST 2 QUALIFIED PLTS ON BOARD. IF THERE IS ANOTHER INFLT PROB; ALL CTL WILL BE RETURNED TO QUALIFIED PLT AND THE PROB WILL BE SOLVED BY THE PLT IN THE JUMP SEAT AND THE ACFT WILL BE FLOWN BY THE QUALIFIED PLT WHO WILL BE IN THE L-HAND PLT SEAT AT ALL TIMES. THIS GENTLEMAN WILL ALSO RECEIVE MORE TRAINING BY A QUALIFIED INSTRUCTOR BEFORE BEING TRUSTED WITH THE COPLT DUTIES AND FLYING FROM THE R-HAND SEAT.