MD80 CREW LOST CTL OF CABIN PRESSURIZATION AND EXECUTED AN EMER DSCNT.

Narrative

WHILE AT CRUISE; WE GOT A CABIN WARNING LIGHT. WE GOT A CLRNC TO DSND; AND THE CABIN WAS CLBING AND PASSING 10000 FT. WE CONTINUED OUR DSCNT TO 10000 FT. DURING THE DSCNT; THE CABIN CONTINUED TO CLB. APCHING 14000 FT CABIN ALT; WE DEPLOYED THE MASKS. WE LEVELED OFF AT 10000 FT AND FINISHED THE CHKLIST. THE AUTO CTLR HAD FAILED; AND THE STANDBY DID NOT PICK UP. WE GOT NO LIGHTS EXCEPT THE CABIN WARNING LIGHT AND CABIN OXYGEN ON LIGHTS AFTER DEPLOYING THE MASKS. WHILE LEVEL AT 10000 FT; WE USED MANUAL PRESSURIZATION TO GAIN CTL OF THE CABIN PRESSURE. ONCE STABILIZED; THE CAPT CONTACTED DISPATCH AND TOLD THEM WHAT HAD HAPPENED. WE THEN GOT A CLRNC TO CLB TO FL180 AND CLBED BACK UP TO CONSERVE FUEL; SO WE COULD MAKE IT TO DFW. AT THAT TIME; THE CABIN PRESSURE WAS NORMAL; AND WE WERE ABLE TO CTL IT WITH MANUAL PRESSURIZATION. THE ACFT HAD BEEN WRITTEN UP PREVIOUSLY FOR THE SAME PROB; BUT IT HAD BEEN 5 DAYS PRIOR. WE COMPLETED ALL CHKLISTS FOR THE PROB; AND THEN REVIEWED THE MANUAL PRESSURIZATION PROC PRIOR TO DSCNT AND LNDG AT DFW. SUPPLEMENTAL INFO FROM ACN 572196: WE WERE ABOUT 1 1/2 HRS FROM LNDG IN DFW. WE HAD ALREADY BEGUN TO DSND; WHEN THE OXYGEN MASKS DROPPED.