B727 PERFORMING A CAT II APCH TO DFW MAKES A HARD LNDG AND GOES AROUND. ACFT WENT INTO A NOSE DOWN PITCH ATTITUDE WHEN AUTOPLT WAS DISCONNECTED.

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TIME: XA00Z. FREQ/ALT: FINAL APCH DFW. ATC FACILITY DFW APCH TWR. LOCATION: ILS RWY 18R CAT II DFW. CAT II 1200 FT RVR APCH; AT APPROX DECISION HT; NOTABLE ACFT PITCH NOSE DOWN. CAPT INSTANTLY DISCONNECTED AUTOPLT AND INITIATED NOSE UP PITCH AND INCREASED PWR. RAPID 50-40- 30-20 SINK RATE CALLS FROM GPWS -- TO A NOT HARD LNDG. NO MASKS DEPLOYED; ETC. NOSEWHEEL OR TAILSKID DID NOT TOUCH RWY. WITH INCREASED NOSE UP PITCH AND EXTRA PWR; AFTER TOUCHDOWN; ACFT BECAME AIRBORNE. WITH NO VISUAL REFS; 1200 FT RVR; AIRBORNE; EXECUTED IMMEDIATE GAR. WITH DFW AT MINIMUMS AND FUEL CONSIDERATIONS; WENT TO FILED ALTERNATE ABI. LENGTHY GND DELAY. NO REPEAT; NO PAX OR FLT ATTENDANT COMPLAINTS OF INJURIES OR ANYTHING AT ALL. COCKPIT DOOR OPEN DURING GND DELAY. TALKED TO PAX -- ALL FINE; READY TO GO BACK TO DFW. FLEW ACFT TO DFW-DCA-MIA; NO PROBS. FLT ATTENDANTS RPT ALL PAX NICE AND UNDERSTANDING AND THE TOUCHDOWN/GAR WAS NOT HARD. DISPATCH ADVISED ME TO DOCUMENT GAR BECAUSE OF PAX COMPLAINT. WE DID OBSERVE ALL PAX EXIT ACFT WITH ITEMS IN HAND -- ALL WITHOUT ANY ASSISTANCE.