MD82 first officer reports being dispatched with one pack inoperative and discovering after takeoff ...

Narrative:

Previous crew wrote up the aircraft for 'low airflow.' the inbound captain and first officer both stated how airflow to the cockpit was very poor on the ground and on climbout. Maintenance troubleshooting revealed a faulty left pack. We coordinated with dispatch (mel 21-1a 'one pack inop. Pressurized flt.) and re-planned the flight for FL240 with additional fuel. We reviewed 'packs off' performance data and discussed 'packs off' takeoff procedures. On takeoff at 400 ft 'right pack' reinstatement was negligible. Pressurization was slow to nonexistent due to low airflow and the cabin was climbing off schedule. Shortly thereafter the 'pressurization flow' light came on. The outflow valve had moved to fully closed with the cabin still climbing off schedule. We followed the QRH procedures; declared an 'emergency' and immediately brought the plane back to land. The captain accomplished a smooth and uneventful overweight landing.

Original NASA ASRS Text

Title: MD82 First Officer reports being dispatched with one pack inoperative and discovering after takeoff that the remaining pack is also faulty. Flight returns to the departure airport.

Narrative: Previous crew wrote up the aircraft for 'Low Airflow.' The inbound Captain and F/O both stated how airflow to the cockpit was very poor on the ground and on climbout. Maintenance troubleshooting revealed a faulty left pack. We coordinated with Dispatch (Mel 21-1a 'One pack Inop. pressurized Flt.) and re-planned the flight for FL240 with additional fuel. We reviewed 'Packs Off' performance data and discussed 'Packs Off' takeoff procedures. On takeoff at 400 FT 'Right Pack' reinstatement was negligible. Pressurization was slow to nonexistent due to low airflow and the cabin was climbing off schedule. Shortly thereafter the 'Pressurization Flow' Light came on. The outflow valve had moved to fully closed with the cabin still climbing off schedule. We followed the QRH Procedures; declared an 'Emergency' and immediately brought the plane back to land. The Captain accomplished a smooth and uneventful overweight landing.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1116958
Time
Date	201309
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	MD-82
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Component
Aircraft Component	Air Conditioning and Pressurization Pack
Person 1
Function	First Officer Pilot Not Flying
Events
Anomaly	Aircraft Equipment Problem Critical

MD82 first officer reports being dispatched with one pack inoperative and discovering after takeoff that the remaining pack is also faulty. Flight returns to the departure airport.