Citation V/Ultra/Encore (C560)
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Air Traffic Control Issued New Clearance; Flight Crew Diverted; Flight Crew Took Evasive Action
Aircraft
At FL260 in cruise flight we both suddenly heard and felt a difference in the cabin atmosphere and noise level. We both scanned the instruments and found the Cabin Alt was climbing and the differential pressure was descending. We [responded to the situation] and were given a small descent to FL210 due to traffic. Before we got to FL210 ATC gave us 10;000 ft. We both donned our O2 masks and ran the Quick Reference Checklist. We leveled at 10;000 ft. and contacted our company about our issue and when they got back to us they requested we [divert] to [a nearby airport] instead of continuing to [destination]. [We] landed without further incident.
[Report Narrative Contained No Additional Information.]
CE-560EP flight crew reported loss of pressurization at FL260. Flight descended and diverted.