ALTDEV.

Narrative

ON CLBOUT OF MHT WITH THE FO FLYING THE ACFT; WE WERE CLRED TO 10000 FT. AT APPROX 8500 FT WE BROKE OUT OF ICING CONDITIONS AT WHICH TIME THE FO REACHED UP TO SECURE ENG ANTI-ICE. IN DOING SO HE MISTAKENLY TURNED THE 'B' SYS HYD PUMP SWITCHES OFF CAUSING THE AUTOPLT TO KICK OFF. AS CAPT; I WAS IN THE PROCESS OF SWITCHING RADIO FREQ TO CONTACT CTR. I NOTICED THE AUTOPLT DISENGAGE ALONG WITH OTHER ASSOCIATED CAUTION LIGHTS RELATED TO THE 'B' HYD SYS. I IMMEDIATELY NOTED THE 'B' HYD SYS PUMP SWITCHED OFF. I RESTORED THE HYD SYS AND NOTED THE ACFT CLBING THROUGH 10000 FT. I CALLED ALT AND THE FO LEVELED THE ACFT AT 10600 FT CORRECTING BACK TO 10000 FT. I CHKED IN WITH CTR AND WAS CLRED TO FL230. THE CTLR DID NOT COMMENT; OR SEEM TO NOTICE THIS DEV. REMAINDER OF THE FLT WAS NON-EVENTFUL. TO PREVENT THIS FROM HAPPENING AGAIN; I WILL BRIEF PRIOR TO FLT THAT ENG ANTI-ICE ON OR OFF WILL BE VERBALLY CALLED OUT THEREBY CALLING ATTN TO THE EVENT. ALSO AFTER THIS EVENT THE FO AND I HAD A LONG DISCUSSION ON FLYING THE ACFT FIRST AND LETTING THE PNF TROUBLESHOOT THE MALFUNCTION. I DON'T THINK THIS MISTAKE WILL HAPPEN TO EITHER OF US AGAIN. OFF NOTE: THE LOCATION AND SWITCH SIZE OF BOTH THE 'B' HYD PUMP SWITCHES AND ENG ANTI-ICE SWITCHES ARE IN THE SAME AREA ON THE OVERHEAD PANEL.