A NIGHTTIME DC8 FREIGHTER CREW IS DISTR BY A YAW DAMPER PROB AND FLIES PAST THE REQUIRED OUTBOUND RADIAL ON THE JAAWS 9 DEP PROC FROM SJU; PR.

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CLRNC: JAAWS 9 DEP R507 GTK. AFTER TKOF ON HDG 350 DEGS; WE WERE CLRED DIRECT TO JAAWS. WHILE INTERCEPTING THE 326 DEG RADIAL AT JAAWS; FO COUPLED THE AUTOPLT AND THE ACFT EXPERIENCED CONTINUOUS YAW OSCILLATIONS. FO DISENGAGED THE AUTOPLT WHILE MAINTAINING ACFT CTL; HDG 305 DEGS; WINGS LEVEL; CLBING OUT OF APPROX FL200. CAPT AND FE REVIEWED CHKLIST FOR 'AUTOPLT HARDOVER ANY AXIS.' (THIS WAS THE ONLY AOM PROC WHICH SEEMED TO APPLY.) SHORTLY AFTER; ATC ASKED IF WE WERE PROCEEDING TO UTAHS. AT THIS POINT WE HAD PASSED THROUGH THE 326 DEG RADIAL AND WERE ON THE 318 DEG RADIAL AT 52 NM (APPROX 4 NM L OF COURSE). WE IMMEDIATELY TURNED TO INTERCEPT THE 326 DEG RADIAL. ZSU THEN CLRED US DIRECT TO GTK. WE INFORMED ATC OF OUR PROB AND CONTINUED THE FLT. CONTRIBUTING FACTORS: FATIGUE ASSOCIATED WITH AN EARLY MORNING LCL RPT TIME SLOWED SCAN AND ABILITY TO PRIORITIZE CORRECTLY. ACFT MECHANICAL PROB; PARTICULARLY WITH IT BEING A FLT CTL PROB; DISTR ATTN AWAY FROM NAV RESPONSIBILITIES. SUPPLEMENTAL INFO FROM ACN 432413: FATIGUING NIGHT FLT 7 1/2 HRS INTO A SCHEDULED 12 HR DUTY DAY.