Aircrew experienced a depressurization event and returned to the airport of origin.

Attributes
ACN	1331326
Time
Date	201501
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.TRACON
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Pressurization System
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

'Cabin altitude' red warning and aural annunciator came on while climbing through 12000 feet. Flight attendant (flight attendant) lead informed us that there was a loud noise and air blowing on the L2 door. We advised ATC and requested lower altitude. Operations and passengers were advised of the situation. QRH procedures were executed successfully. Manual pressurization was kept under control during descent; approach; and landing. Ops was advised to contact dispatch and maintenance control.

Original NASA ASRS Text

Title: Aircrew experienced a depressurization event and returned to the airport of origin.

Narrative: 'CABIN ALT' Red Warning and aural annunciator came on while climbing through 12000 feet. FA (Flight Attendant) Lead informed us that there was a loud noise and air blowing on the L2 Door. We advised ATC and requested lower altitude. Operations and passengers were advised of the situation. QRH procedures were executed successfully. Manual pressurization was kept under control during descent; approach; and landing. Ops was advised to contact Dispatch and Maintenance Control.

Data retrieved from NASA's ASRS site 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.