A PART 135 SMT FLC EXPERIENCES AN ALT EXCURSION WHILE ATTEMPTING TO RESET A TRIPPED GENERATOR.

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DURING CLBOUT; #1 GENERATOR OUT OF SVC LIGHT CAME OUT ON THE ANNUNCIATOR PANEL. IT WAS MY LEG; AND SINCE RESETTING THE GENERATOR INVOLVES OPENING UP A FLOOR BOARD TO ACCESS THE GENERATOR CTL BOX; I TOLD MY FO THAT WE WERE GOING TO WAIT UNTIL WE LEVELED OFF AT 10000 FT; AND PROCEED WITH THE GENERATOR OUT CHKLIST AFTER WE FINISHED WITH THE CRUISE CHK. WE DID THAT; I KEPT FLYING AND HE FOLLOWED THE CHKLIST OUT LOUD. IT WAS A LITTLE BUMPY (CONTINUOUS LIGHT TURB) AND WE WERE GOING THROUGH SOME LIGHT RIME ICING; BUT NOTHING OUT OF THE ORDINARY FOR AN ALASKAN FALL. THE FO TOLD ME HE COULDN'T OPEN THE TRAP DOOR; TO MY SURPRISE; BECAUSE YOU CAN BASICALLY DO THAT WITH 2 FINGERS. I GAVE HIM THE CTLS AND HE ACKNOWLEDGED; I DUCKED UNDER AND OPENED THE DOOR WITHOUT TROUBLE. BEFORE I PROCEEDED TO RESET THE GENERATOR; I GLANCED UP; AND TO MY DISMAY; MY FO HAD GONE THROUGH 10350 FT AND WAS STILL CLBING AT 500 FPM. I RAISED UP AND I REGAINED THE CTLS; DSNDING DOWN TO 10000 FT. HE SEEMED A BIT CONFUSED; AND I EXPLAINED TO HIM THE GRAVITY OF AN ALT INCURSION. SINCE THE CTL BOX WAS STILL OPEN; I RESET THE GENERATOR WITH MY R HAND WHILE I CONTINUED TO FLY WITH THE L ONE. THE GENERATOR RESET WITHOUT TROUBLE. I THINK HE GOT SOME VERTIGO WITH THE TURB AND HIS HEAD DOWN TRYING TO OPEN UP THE TRAP DOOR; BUT HE DIDN'T SAY A WORD ABOUT IT; SO I DIDN'T KNOW HIS CONDITION WHEN I ASKED HIM TO TAKE CTL OF THE AIRPLANE.