LR24 VERY LIGHT CLBING TO FL190 FOR MAINT CHK. CHKLIST CALLS TO CHK OXYGEN MASK AND IN SO DOING OVERSHOT ALT. CTLR QUERIED AND CAPT TURNED OFF THE XPONDER; CLOSED THROTTLES AND INITIATED A 60 DEG BANK TO EXPEDITE BACK TO ALT.

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NON STANDARD OXYGEN SVCING BY MAINT (EXTERIOR ACCESS OXYGEN VALVE WAS LEFT OFF). LOW TIME SIC. FAILURE TO DESIGNATE TASKS BY PIC. ON CLBOUT THROUGH FL180; CHK OXYGEN MASKS IS PART OF THE CHKLIST. (I HAD CHKED OXYGEN AND MASK OP PRIOR TO FLT THEN HAD OXYGEN ADDED.) DURING THE DISTR OF PLAYING WITH THE OXYGEN MASKS; I MISSED THE FL190 LEVELOFF. A LIGHT LR24 CLBS VERY WELL AND I MISSED THE ALT SUBSTANTIALLY. THE ATC CTLR QUERIED ME AS TO THE ALT AND AS HAPPENS I LIED; SHUT OFF THE MODE C; CLOSED THE THROTTLES; OPENED SPOILERS AND INTRODUCED A 60 DEG BANK TO RETURN TO MY ALT (FL190). THERE WAS NO FURTHER MENTION OF THE EVENT BY ATC. HUMAN PERFORMANCE CONSIDERATIONS: A FALSE RELIANCE ON THE AUDIO PORTION OF THE ALT ALERTER (IT FAILED TO DING). A CLASSIC FAILURE TO DESIGNATE RESPONSIBILITY IN THE FACE OF MERELY AN ABNORMAL SIT. IN AN EMER SIT THE DELEGATION OF RESPONSIBILITY IS AN AUTOMATED RESPONSE AS A RESULT OF OUR TRAINING. I NEED TO; AND WILL NOW; TREAT 'ABNORMALS' MORE LIKE THE EMERS THEY COULD LEAD TO. THE INEXPERIENCE OF THE COPLT CONTRIBUTED TO HIM NOT CHALLENGING ME. PEOPLE BEING AS UNRELIABLE AS THEY ARE AND COMPUTERS BEING SO GOOD WHY ISN'T THERE AN ALERT SYS ON THE ATC SCREEN WHEN A RATE OF CLB OR DSCNT EXCEEDS 2000 FPM OR 1500 FPM WITHIN 800-1000 FT OF AN ASSIGNED ALT? THIS WOULD ALLOW THE CTLRS TO SAY 'VERIFY LEVELING FLXXX' AS AN AID TO HELP MINIMIZE THESE OCCURRENCES.