A CONCERNED LR25 FO TELLS OF HIS CAPT'S VISUAL SHORTCOMINGS AS THE PIC ENABLES A DOOR TO BE IMPROPERLY CLOSED AND AN ALT OVERSHOOT. BOTH EVENTS HAD ASSOCIATED WARNING SYS THAT ALERTED THE FO BUT NOT THE PIC AT FLL; FL.

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AS WE WERE BEING VECTORED FOR THE APCH TO FLL; WE WERE GIVEN A FURTHER DSCNT TO 4000 FT. PASSING 5000 FT; I SHOUTED; '1000 TO GO.' THIS WAS FOLLOWED BY THE ALT ALERTER SOUNDING. EVERYTHING LOOKED NORMAL FOR THE NEXT FEW MOMENTS; AND I WAS TRYING TO LOOK FOR TFC QUITE A BIT IN THIS BUSY AREA. MY HEAD WAS UP WHEN I HEARD THE ALT ALERTER SOUND A SECOND TIME. THIS INDICATED A DEV FROM THE SET ALT. I LOOKED OVER AND SAW OUR ALT WAS 3700 FT AND DSNDING. I PLACED SOME SLIGHT BACK PRESSURE ON THE YOKE AND YELLED; 'ALT.' THE PIC PLACED FORWARD PRESSURE TO COUNTERACT ME AND CONTINUED THE DSCNT TO 3500 FT. AT THIS TIME; I TAPPED ON THE GLASS OF HIS ALTIMETER AND YELLED; '4000.' HE SAID; 'OH THANKS; I WAS HEADED FOR THREE.' AS HE STARTED A CLB TO 4000 FT; ATC SAID; 'LEAR XYZ YOUR ASSIGNED ALT WAS 4000.' WE WERE NOT WEARING HEADSETS; AND THE PIC WAS NOT WEARING ANY HEARING PROTECTION. LOOKING BACK ON IT; I HAVE A QUESTION AS TO WHETHER HE HEARD MY '1000 TO GO' CALLOUT OR THE ALT ALERTER. THE ALT ALERTER WAS LOCATED DOWN BY THE FUEL PANEL; WHICH WOULD HAVE MADE IT LESS NOTICEABLE VISUALLY. THERE WERE A FEW OTHER THINGS I NOTICED WHICH MAKE ME QUESTION HOW WELL THE PIC COULD SEE OR HEAR. FOR EXAMPLE; ON THE ENG START FOR THIS FLT; THE PIC DID NOT FOLLOW THE BATTERY CHARGE BACK PROC. WHEN I ASKED HIM ABOUT IT; HE TOLD ME HE COULD NOT READ THE AMMETER GAUGES BECAUSE HE HAD TROUBLE SEEING THE SMALLER GAUGES. ALSO; BEFORE THE TAXI; I NOTICED DOOR LIGHT WAS ILLUMINATED. WHEN I LOOKED AT THE DOOR; I SAW THAT IT WAS PARTIALLY UNLATCHED. WHEN THE PIC SHUT THE DOOR; HE LEFT THE BOTTOM HANDLE FACING AFT; TO THE UNLATCHED POS. ALTHOUGH HE HAD EXPERIENCE OPERATING THIS TYPE OF DOOR; HE FAILED TO CLOSE THE DOOR PROPERLY TWICE. NEITHER TIME DID HE NOTICE THAT THE DOOR LIGHT DIDN'T GO OUT.