AN MD11F CRUISE AT FL360 #2 AUTOPLT BEGAN AN UNCOMMANDED CLB OF 600-700 FPM. ALT HOLD SELECTED AND AIRPLANE LEVELED AT FL360.

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ON SEP/FRI/06; WE TOOK OFF AT XA00Z. DURING CLBOUT ON DEP WE MADE A TURN TO THE W AND THE #2 AUTOPLT DISCONNECTED DURING THE TURN. WE LEVELED OUT AND ENGAGED THE #2 AUTOPLT AGAIN AND CONTINUED ON OUR WAY. WE HAD BEEN CRUISING FOR ABOUT 8.5 HRS. I WAS LOOKING AT MY CHARTS AT THE TIME BECAUSE WE WERE CHANGING FROM ONE CHART TO ANOTHER. WE HAD ENTERED SOME LIGHT TURB AND THEN HAD A FEELING OF THE NOSE CLBING. THIS CAUSED ME TO LOOK AT MY INSTS AND I SAW THE VV1 TAPE INCREASING THROUGH 600-700 FPM OF AN UNCOMMANDED CLB. I LOOKED OVER TO SEE 37XXX FT IN THE ALT WINDOW AND QUICKLY ASKED THE FO IF WE WERE CLRED TO THAT ALT. HE SAID NO AND WAS ALREADY REACHING FOR THE ALT DIAL AND TURNED IT TO 36000 FT. I LOOKED BACK TO CHK MY COURSE; HDG; SPD ETC; AND BY THAT TIME THE ACFT WAS LEVELING BACK TO 36000 FT. I THEN SELECTED ALT HOLD (WE HAD NOT BEEN IN ALT HOLD BEFORE) AND WATCHED IT CAREFULLY THE REST OF THE FLT WITHOUT ANY OTHER PROBS. WE ENTERED A WRITE UP IN THE LOGBOOK OF ACFT X AND DESCRIBED THE UNCOMMANDED CLB EVENT.