MD-80 Series (DC-9-80) Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Air Traffic Control Issued New Clearance
Aircraft; Weather
While descending out of 17;000 FT the Captain turned the airfoil and engine anti-ice on with the throttles at approximately 1.1 EPR. During the descent; the 'pressurization flow' light illuminated. He deployed the speed brake; so he could increase the power thus increasing the air flow. We leveled at 12;000 FT and the cabin continued to climb at a rate of 300-500 FPM. We verified the outflow valve was closed. The Captain secured the anti-ice and the cabin rate slowed but did not stop. I pulled the QRH and completed all tasks and checklists for the 'pressurization flow' procedure. We requested and received a lower altitude of 7;000 FT. At this altitude the cabin fully depressurized and my sliding window became quite loud; but the Captain and I could still communicate effectively. No emergency was declared because we were already below 10;000 FT. Shortly we were cleared for the visual and landed without incident.
While descending out of 17;000 FT I turned the airfoil and engine anti ice on with the throttles at approximately 1.1 EPR. During descent the pressurization flow light illuminated. I deployed the speed brake so I could increase the power to try and increase the airflow. We leveled off at 12;000 FT and the cabin continued to climb at a rate of 300-500 fpm. We verified the outflow valve was fully closed. I secured the anti-ice. The rate of cabin climb slowed but did not stop. We went through and verified our actions in the QRH Pressurization Flow procedure. I requested and received lower altitude. While level at 7;000 FT the cabin differential decreased to zero and we became fully depressurized. Wind noise from the cockpit window(s) became quite loud; but did not interfere with cockpit communication. No emergency was declared. I saw no need because we were already below 10;000 FT and shortly after depressurization we were cleared for a visual approach. Paramedics met the airplane because of a separate passenger issue that had been coordinated with Dispatch.
MD80 flight crew experiences a pressurization flow light during descent with wing and engine anti-ice on and the cabin altitude climbing. Attempts to restore sufficient flow are not successful and the cabin is completely depressurized at 7;000 FT.