B767-200 CREW HAS LIGHTNING STRIKE DURING DEP RESULTING IN TEMPORARY LOSS OF AUTOFLT SYS. DURING ARR PHASE OF FLT AUTOPLT COULD NOT CTL ROLL AND MANUAL ROLL CTL WAS VERY LIMITED.

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ON CLBOUT FROM ATL; IN WX; TOOK LIGHTNING STRIKE. KNOCKED OUT AUTOPLT AND AUTOTHROTTLES. REENGAGED SUCCESSFULLY AND NO FURTHER PROBS UNTIL ON ARR INTO SEA. PASSING 17000 FT IN DSCNT; AUTOPLT KICKED OFF WHILE COMMENCING A TURN. I TOOK MANUAL CTL AND FOUND I COULD NOT ROLL ACFT WITH YOKE (PITCH OK) CTLS FELT JAMMED. TRIED ALL AUTOPLTS; BUT NONE COULD CTL ACFT HEADING (USING RUDDER); AND KEPT DISENGAGING. GOT VECTOR CLR OF TERRAIN AND OTHER ACFT; SLOWED AND CONFIGURED FOR LNDG. FOUND HAD ENOUGH ROLL CTL FOR SAFE LNDG; ALTHOUGH CTLS STILL VERY STIFF. DECLARED EMER. MADE UNEVENTFUL LNDG. ON TAXI IN; CTLS STILL VERY STIFF IN ROLL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR SAID THAT ONCE THE AUTOPLT WAS REENGAGED DURING THE DEP PHASE OF FLT THERE WERE NO TURNS REQUIRED BECAUSE OF DIRECT ROUTING. WHEN TURNS WERE REQUIRED THE AUTOPLT DISCONNECTED AND BOTH PLTS WERE UNABLE TO GET MORE THAN VERY LIMITED ROLL WITH THE CTL WHEEL IN MANUAL FLT. THE CTLS SOUNDED AS IF THERE WAS A RATCHETING AND FELT AS IF THEY WERE LOCKED. PITCH CTL WAS NORMAL. AFTER THE ACFT WAS SLOWED FOR APCH THERE WAS MORE ROLL CTL THAT WAS ASSUMED TO BE MADE AVAILABLE AS THE OUTBOARD AILERONS WERE UNLOCKED AT THE REDUCED AIRSPD. AFTER LNDG THE YOKE WAS STILL STIFF IN ROLL. ONCE PARKED AND PWR WAS SWITCHED TO A GND SOURCE AND HYD SYS PWRED AGAIN YOKE MOVEMENT WAS NORMAL. FLT RECORDER WAS REMOVED AND THE FAA AND BOEING ARE WORKING ON THE PROB. THERE IS SOME THOUGHT THAT THERE MAY HAVE BEEN ICE ACCUMULATION IN THE CTLS DURING DEP.