A ce-560 captain reported diverting to a nearby alternate after experiencing loss of cabin pressure.

Attributes
ACN	1337175
Time
Date	201602
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	Citation V/Ultra/Encore (C560)
Operating Under FAR Part	Part 135
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Pressurization System
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 83 Flight Crew Total 10416 Flight Crew Type 1241
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Enroute at FL310 approximately 35 minutes from [destination]; we heard a loud pop and the cabin pressurization rate of climb went to 4;000 fpm. A descent was requested from ATC; approved; and initiated. Emergency procedures were initiated and completed. Aircraft diverted to [a nearby alternate] with the cabin altitude stabilized at approximately 13;000 feet until the descent was completed.

Original NASA ASRS Text

Title: A CE-560 Captain reported diverting to a nearby alternate after experiencing loss of cabin pressure.

Narrative: Enroute at FL310 approximately 35 minutes from [destination]; we heard a loud pop and the cabin pressurization rate of climb went to 4;000 fpm. A descent was requested from ATC; approved; and initiated. EMERGENCY procedures were initiated and completed. Aircraft diverted to [a nearby alternate] with the cabin altitude stabilized at approximately 13;000 feet until the descent was completed.

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.