Dispatched with the left pack inoperative; an md-80 was unable to pressurize after takeoff while ope...

Attributes
ACN	977334
Time
Date	201110
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.TRACON
State Reference	US
Aircraft 1
Make Model Name	MD-83
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Air Conditioning and Pressurization Pack
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying First Officer
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Takeoff was made with AC packs off as per MEL. Right pack was turned on per MEL passing 500 ft AGL. During initial climbout; single pack operation would not adequately pressurize aircraft. 25 psi noted on right pack; cabin alt control lever automatic; and outflow valve full closed; cabin climbing. Leveled off at 5;000 ft. QRH abnormal checklist followed for pressurization flow light. Emergency declared due to overweight landing requirements. Captain performed overweight landing. Uneventful approach; landing; and return to gate.

Original NASA ASRS Text

Title: Dispatched with the left pack inoperative; an MD-80 was unable to pressurize after takeoff while operating on a single pack per the MEL and AOM requirements.

Narrative: Takeoff was made with AC packs OFF as per MEL. Right Pack was turned on per MEL passing 500 FT AGL. During initial climbout; single pack operation would not adequately pressurize aircraft. 25 PSI noted on right pack; cabin alt control lever AUTO; and outflow valve full closed; cabin climbing. Leveled off at 5;000 FT. QRH abnormal checklist followed for Pressurization Flow Light. Emergency declared due to overweight landing requirements. Captain performed overweight landing. Uneventful approach; landing; and return to gate.

Data retrieved from NASA's ASRS site as of April 2012 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.

Dispatched with the left pack inoperative; an md-80 was unable to pressurize after takeoff while operating on a single pack per the MEL and aom requirements.