B737 captain reported that the cabin altitude exceeded 10;000 feet while in climb at 25;000 feet; so...

Attributes
ACN	1324295
Time
Date	201601
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Pressurization System
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 161 Flight Crew Type 17000
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

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.

Original NASA ASRS Text

Title: 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.

Narrative: 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.

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.

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.