MD-82
Flight Crew Air Transport Pilot (ATP)
Flight Crew Total 18000
ATC Issue All Types; Aircraft Equipment Problem Less Severe
Air Traffic Control Issued New Clearance; Flight Crew Overcame Equipment Problem; General Declared Emergency
Aircraft; Procedure
At FL270...300 KIAS 1. Master Caution - 'Pressurization Flow' with cabin climbing  2. Declared emergency and requested emergency descent to 10;000 feet.  3. ATC acknowledged.  4. Gave a clearance to FL240.  5. Which I replied; 'Negative; we've begun emergency descent; request 10;000.' 6. ATC acknowledged 10;000... Heard a turn given to another aircraft of 40 degrees; TCAS did not show a below conflict. 7.  During descent with QRH procedures we did manually regain cabin controller in standby and prevented cabin from exceeding 10;000 feet. 8. We requested 11;000 MSL for continued cruise on the arrival. And reported regaining normal operations 9. Multiple components of the pressurization system failed to initiate this event. Emergency descent is a trained response procedure and checking below on TCAS we expect turn guidance to clear traffic.  A short descent of 3;000 feet would be an abrupt halt to an increasing speed and descent rate with speedbrakes deployed. W e appreciate all the help received from ATC.
MD-82 Captain experiences a pressurization flow light at FL270 and declares an emergency requesting 10;000 feet as descent is initiated. The initial clearance is to FL240 and ATC is reminded of the emergency status. Manual control of the pressurization system is regained at 15;000 feet and flight continues to destination.