MD80 crew was unable to pressurize the aircraft after takeoff in dfw class B airspace.

Attributes
ACN	565702
Time
Date	200211
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	msl single value : 5000
Aircraft 1
Controlling Facilities	tracon : d10.tracon tower : cdw.tower
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	565702
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	maintenance problem : improper maintenance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : cabin pressurization indicators other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : diverted to another airport none taken : detected after the fact other
Consequence	other other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : fault isolation performance deficiency : testing performance deficiency : repair
Supplementary
Problem Areas	Aircraft Company
Primary Problem	Aircraft

Narrative:

Air interrupt. Departing dfw, first officer was flying the aircraft. Shortly after takeoff, both packs failed and aircraft failed to pressurize properly. Procedure was followed to reinstate them to no avail. (Aircraft had a very recent history of similar problem.) I took over flying duties, advised ATC that we had a pressurization problem. They gave us 345 degree heading, maintain 5000 ft. I also requested first officer to attempt manual control of outflow valve. He reported manual was ineffective. It felt like it was hanging up on something. While this was going on, I noticed that the captain ivsi had failed for about 5-6 mins. I also observed a momentary flag on the captain's airspeed indicator. I advised ATC that we were fine, but we were returning to dfw because of a pressurization problem. No emergency was declared. I requested the first officer to contact dfw operations to advise dispatch and maintenance of our return to base. I advised flight attendants and made a PA advising our passenger. We computed weight, runway requirement, and landing speeds for an overweight landing at dfw. Landed uneventfully at 141000 pounds. Very smooth landing -- 100-200 KTS vertical speed, rolled out with very minimal braking returned to gate, made appropriate logbook entries for pressurization problem and overweight landing. We obtained another aircraft and departed for lax.

Original NASA ASRS Text

Title: MD80 CREW WAS UNABLE TO PRESSURIZE THE ACFT AFTER TKOF IN DFW CLASS B AIRSPACE.

Narrative: AIR INTERRUPT. DEPARTING DFW, FO WAS FLYING THE ACFT. SHORTLY AFTER TKOF, BOTH PACKS FAILED AND ACFT FAILED TO PRESSURIZE PROPERLY. PROC WAS FOLLOWED TO REINSTATE THEM TO NO AVAIL. (ACFT HAD A VERY RECENT HISTORY OF SIMILAR PROB.) I TOOK OVER FLYING DUTIES, ADVISED ATC THAT WE HAD A PRESSURIZATION PROB. THEY GAVE US 345 DEG HDG, MAINTAIN 5000 FT. I ALSO REQUESTED FO TO ATTEMPT MANUAL CTL OF OUTFLOW VALVE. HE RPTED MANUAL WAS INEFFECTIVE. IT FELT LIKE IT WAS HANGING UP ON SOMETHING. WHILE THIS WAS GOING ON, I NOTICED THAT THE CAPT IVSI HAD FAILED FOR ABOUT 5-6 MINS. I ALSO OBSERVED A MOMENTARY FLAG ON THE CAPT'S AIRSPD INDICATOR. I ADVISED ATC THAT WE WERE FINE, BUT WE WERE RETURNING TO DFW BECAUSE OF A PRESSURIZATION PROB. NO EMER WAS DECLARED. I REQUESTED THE FO TO CONTACT DFW OPS TO ADVISE DISPATCH AND MAINT OF OUR RETURN TO BASE. I ADVISED FLT ATTENDANTS AND MADE A PA ADVISING OUR PAX. WE COMPUTED WT, RWY REQUIREMENT, AND LNDG SPDS FOR AN OVERWT LNDG AT DFW. LANDED UNEVENTFULLY AT 141000 LBS. VERY SMOOTH LNDG -- 100-200 KTS VERT SPD, ROLLED OUT WITH VERY MINIMAL BRAKING RETURNED TO GATE, MADE APPROPRIATE LOGBOOK ENTRIES FOR PRESSURIZATION PROB AND OVERWT LNDG. WE OBTAINED ANOTHER ACFT AND DEPARTED FOR LAX.

Data retrieved from NASA's ASRS site as of July 2007 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.