Ce-680 captain reported loss of cabin pressure during climb.

Attributes
ACN	1520963
Time
Date	201802
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Cessna Citation Sovereign (C680)
Operating Under FAR Part	Part 91
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Exterior Pax/Crew Door
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

On departure; climb passing through FL240 on our way to FL320; an amber cabin altitude light illuminated on EICAS. Crew stopped climb at FL250 and communicated with departure control. Crew referenced the QRH and donned the oxygen masks. Secondary red cabin altitude illuminated on EICAS and the crew heard the main cabin door popping and hissing. An emergency was notified to ATC and an emergency descent was initiated to 8;000 feet. Crew elected to land without further incident. Flight control & maintenance control were notified upon landing. Pressurization for this airplane was written up twice in less than five days. A serious assessment and corrective action needs to be made to fix the pressurization before the plane is returned to service for safe flight.

Original NASA ASRS Text

Title: CE-680 Captain reported loss of cabin pressure during climb.

Narrative: On departure; climb passing through FL240 on our way to FL320; an Amber Cabin Altitude light illuminated on EICAS. Crew stopped climb at FL250 and communicated with Departure Control. Crew referenced the QRH and donned the oxygen masks. Secondary Red Cabin Altitude illuminated on EICAS and the crew heard the main cabin door popping and hissing. An emergency was notified to ATC and an emergency descent was initiated to 8;000 feet. Crew elected to land without further incident. Flight Control & Maintenance Control were notified upon landing. Pressurization for this airplane was written up twice in less than five days. A serious assessment and corrective action needs to be made to fix the pressurization before the plane is returned to service for safe flight.

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.