AN ACR B727-200 FLC GAR WHEN THE AUTOPLT PITCHES DOWN AT ABOUT MINIMUMS ON A CAT II APCH TO RWY 18R AT DFW. THE FLC WENT TO THEIR ALTERNATE ARPT.

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CAT II APCH TO RWY 18R AT DFW; RPTED RVR 1200 FT. APCH WAS NORMAL UP TO APPROX 150 FT AT WHICH TIME APCH LIGHTS STARTED TO COME INTO VIEW. CAPT TOOK CTL OF ACFT FROM FO AND AT DECISION HT AUTOPLT RAPIDLY PITCHED DOWN ACFT AT WHICH POINT CAPT IMMEDIATELY DISCONNECTED AUTOPLT AND PITCHED ACFT NOSE UP WHILE ADDING PWR. ACFT LANDED ON RWY IN A NOSE HIGH; PWR ON; ATTITUDE AND AS A RESULT BOUNCED BACK INTO THE AIR. AT THIS POINT VISUAL REF WAS LOST AND CAPT EXECUTED GAR. BECAUSE OF FUEL STATE AND WX AT DFW ELECTED TO PROCEED TO ALTERNATE ABI. UNEVENTFUL FLT TO ABI. AFTER 2-3 HR DELAY WAS ABLE TO RETURN TO DFW AT APPROX XA30 LCL. LNDG ON RWY 18R AFTER CAT II APCH WHEN ACFT BOUNCED INTO AIR WAS NOT IN ANY CREW MEMBERS' OPINION; FLT ATTENDANT OR PLT; HARD. NO MAINT ACTION WAS DEEMED NECESSARY. AT NO TIME THROUGHOUT ENTIRE FLT TUL- DFW-ABI-DFW NO PAX OR CREW RPTED ANY INJURIES OR DISCOMFORT. RPT BEING SUBMITTED DUE TO PAX COMPLAINT AFTER MISSING CONNECTION TO HAWAII. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THIS FO DID NOT THINK THAT THE PITCH DOWN WAS NECESSARILY CAUSED BY THE AUTOPLT. HE SAID THAT THERE HAD BEEN SOME GUSTS ON THE FINAL APCH AND THIS COULD HAVE BEEN A CAUSE. THE AUTOPLT WORKED NORMALLY LATER IN THE DAY. HE SAID THAT THEY WROTE THE RPT PRIMARILY FOR COMPANY USE BECAUSE OF AN IRATE PAX COMPLAINT. THE FLC DID NOT BELIEVE THAT ANY OF THE B727- 200 SYS WERE AT FAULT AND NO MAINT WRITE-UP WAS MADE.