A320 captain reports pneumatic problems affecting pressurization and returns for overweight landing.

Attributes
ACN	789023
Time
Date	200806
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 10000
Aircraft 1
Controlling Facilities	tracon : zzz.tracon
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 150 flight time total : 20000 flight time type : 6000
ASRS Report	789023
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : landed as precaution other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Pneumatic problem discovered right after takeoff required a return to ZZZ and an overweight landing was successfully accomplished. Pressurization was ctlable; the flight never exceeded 10000 ft MSL; the oxygen masks were not required and the passenger masks did not deploy. All checklists; including the overweight landing checklists; were completed. Captain's emergency authority/authorized was exercised and an uneventful landing occurred. Callback conversation with reporter revealed the following information: the reporter stated that the pressurization system was functioning normally; but the temperature could not be controlled. The cabin temperature soon went above 100 degrees requiring an immediate return and overweight landing.

Original NASA ASRS Text

Title: A320 CAPT REPORTS PNEUMATIC PROBLEMS AFFECTING PRESSURIZATION AND RETURNS FOR OVERWEIGHT LANDING.

Narrative: PNEUMATIC PROB DISCOVERED RIGHT AFTER TKOF REQUIRED A RETURN TO ZZZ AND AN OVERWT LNDG WAS SUCCESSFULLY ACCOMPLISHED. PRESSURIZATION WAS CTLABLE; THE FLT NEVER EXCEEDED 10000 FT MSL; THE OXYGEN MASKS WERE NOT REQUIRED AND THE PAX MASKS DID NOT DEPLOY. ALL CHKLISTS; INCLUDING THE OVERWT LNDG CHKLISTS; WERE COMPLETED. CAPT'S EMER AUTH WAS EXERCISED AND AN UNEVENTFUL LNDG OCCURRED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE REPORTER STATED THAT THE PRESSURIZATION SYSTEM WAS FUNCTIONING NORMALLY; BUT THE TEMPERATURE COULD NOT BE CONTROLLED. THE CABIN TEMPERATURE SOON WENT ABOVE 100 DEGREES REQUIRING AN IMMEDIATE RETURN AND OVERWEIGHT LANDING.

Data retrieved from NASA's ASRS site as of May 2009 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.