A CPR SMT DSNDING TO 6000 FT OVERSHOT ASSIGNED ALT DUE TO FLC BRIEFING BEING DONE DURING THE DSCNT. CAPT AND NEW FO HAD NOT YET DEVELOPED CRM PROCS AND NO FORMAL TRAINING AVAILABLE FOR THE FO.

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APCH HAD GIVEN US DSCNT FROM 10000 FT TO 6000 FT. I WAS HAND FLYING BECAUSE AUTOPLT WAS INOP. IN THE DSCNT MY NEW FO (1 WK) WAS PICKING UP AWOS AT M33 AND I WAS HANDLING RADIOS. I WAS JUST PASSING 6500 FT WHEN FO STARTED BRIEFING AWOS AND POSSIBLE APCH. THIS DISTR ME; AND WHEN I NEXT CHKED MY ALT; I WAS 400-500 FT BELOW ASSIGNED ALT. I IMMEDIATELY CORRECTED; ATC ADVISED TO MAINTAIN 6000 FT. CONTRIBUTING FACTORS TO THIS ALTDEV WERE THE HVY WORKLOAD OF HAND FLYING; WATCHING A NEW FO AND GETTING DISTR AT THE MOMENT I SHOULD HAVE STARTED LEVELING. AS A CREW WE DISCUSSED THE DEV AFTER LNDG. WE AGREED THAT OUR CRM NEEDED TO IMPROVE. WE AGREED THAT THE PNF NEEDS TO BE MORE AWARE OF SIT WHEN COMING BACK IN THE LOOP AFTER GETTING WX; TALKING TO FBO'S; ETC. AN INTERESTING NOTE: I HAVE FLOWN THIS ACFT FOR 3 YRS AND HAVE FLOWN SINGLE PLT FOR 2/3 OF THAT TIME. IN THE TIMES THAT I HAVE FLOWN SINGLE PLT I HAVE NOT EXPERIENCED A SINGLE ALTDEV OR ATC DEV. THE WORKLOAD INCREASES ON A CAPT WITH A NEW FO FOR THIS WILL BE THE THIRD ATC DEV I HAVE EXPERIENCED WITH A 2-MAN CREW. THIS IS DUE IN PART TO ON-THE-JOB TRAINING FOR THE FO AND NO FORMAL TRAINING HAS BEEN AVAILABLE. SUPPLEMENTAL INFO FROM ACN 388550: WE WERE IN IMC AND LIGHT TURB DURING THE SIT. THE OTHER PLT AND MYSELF HAD ONLY BEEN FLYING TOGETHER FOR 1 1/2 WKS AND WERE STILL TRYING TO DEVELOP GOOD COCKPIT COM AND INTERACTION.