B737-700 flight crew reported diverting to an alternate airport after experiencing loss of cabin pre...

Attributes
ACN	1634537
Time
Date	201904
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Light	Dawn
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Pressurization Control System
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Experience	Flight Crew Last 90 Days 309 Flight Crew Type 13000
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance

Narrative:

While at FL410 we experienced a cabin altitude warning horn and light. We donned O2 mask and established communication. We followed the qrc checklist and were able to get the cabin to stabilize at approximately 10;200 feet. We had no green altitude light on the pressurization control panel leading us to believe we had a dual controller failure. We followed the emergency descent QRH and advised ATC and dispatch of our intentions. We chose [a nearby alternate] as a diversion point. The cabin began to be in the normal range as we went through about 15;000 feet. We landed without incident.

Original NASA ASRS Text

Title: B737-700 flight crew reported diverting to an alternate airport after experiencing loss of cabin pressure at FL410.

Narrative: While at FL410 we experienced a Cabin Altitude Warning horn and light. We donned O2 mask and established communication. We followed the QRC checklist and were able to get the cabin to stabilize at approximately 10;200 feet. We had no green ALT light on the pressurization control panel leading us to believe we had a dual controller failure. We followed the Emergency Descent QRH and advised ATC and Dispatch of our intentions. We chose [a nearby alternate] as a diversion point. The cabin began to be in the normal range as we went through about 15;000 feet. We landed without incident.

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.