AN S80 ACFT LOSES CABIN PRESSURE 150 MI E OF DFW.

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DEPRESSURIZATION PROB AFTER ICING CONDITIONS. TIME: XA00Z. ATC FREQ: ZFW. LOCATION: DFW/080/150. WE HAD A FLOW LIGHT COME ON AT 150 NM E OF DFW AT FL260 JUST AFTER EXITING ICING CONDITIONS. WE FOLLOWED EMER PROCS AND DECLARED AN EMER AT FL200 IN THE DSCNT. ONLY BY GOING TO MANUAL PRESSURIZATION DID IT FINALLY ARREST THE CABIN ALT FROM CLBING. CABIN ROSE FROM 4200 TO 7000 AT ITS HIGHEST. WE HAD DISPATCH HAVE EMER TECHNICIANS ON STANDBY ALERT AT THE GATE IN CASE OF EAR PROBS. NO PAX; AND ONLY 1 FLT ATTENDANT COMPLAINED OF ANY EAR DISCOMFORT. FLT ATTENDANT CONTINUED ON SEQUENCE. AS A SIDE NOTE OF IMPORTANCE; FO PERFORMED IN AN OUTSTANDING MANNER THROUGHOUT THIS PROC. FO HANDLED HIMSELF COMMENDABLY RUNNING THE CHKLIST; COORDINATING WITH THE FLT ATTENDANTS; TALKING WITH DISPATCH; AND MOST IMPORTANTLY; HANDLING THE MANUAL PRESSURIZATION SCHEDULE ON AN MD80 AND KEEPING THE CABIN PRESSURE FROM REACHING 10000 FT. HE CERTAINLY DESERVES AN ATTABOY. SUPPLEMENTAL INFO FROM ACN 359727: AT FL260 WITH WING AND ENG AI ON; FLOW LIGHT CAME ON AND CABIN ALT WAS CLBING. QRH PROCS YIELDED ONLY TEMPORARY RELIEF. DECLARED EMER; DSNDED AND MANUAL CTL SELECTED. CLRED DIRECT TO DFW AT 10000 FT AND LANDED RWY 17L WITHOUT FURTHER INCIDENT. EMT CALLED TO MEET FLT FOR POSSIBLE PHYSICAL PROBS WITH PAX AND CREW. NONE NOTED UPON ARR.