B737 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 161; Flight Crew Type 17000
Troubleshooting; Other / Unknown
Aircraft Equipment Problem Critical
Flight Crew Diverted; Flight Crew Landed in Emergency Condition
Aircraft
Cabin altitude about 10;500 ft. Warning horn and light. Donned oxygen masks and gained communication. Initiated emergency descent and [advised ATC]. Cleared to 10;000 ft. Accomplished Cabin Altitude Warning Checklist. Informed Flight Attendants and Passengers. Accomplished Emergency Descent Checklist. Contacted Dispatch and Duty Control for diversion and overweight landing. Debriefed First Officer and Flight Attendants after normal landing.
B737 Captain reported that the cabin altitude exceeded 10;000 feet while in climb at 25;000 feet; so he initiated an immediate descent and diverted to a nearby airport.