Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Flight Crew Landed in Emergency Condition; Flight Crew Returned To Departure Airport; Flight Crew FLC complied w / Automation / Advisory; Flight Crew FLC Overrode Automation
Aircraft
'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.
Aircrew experienced a depressurization event and returned to the airport of origin.