Citation Excel (C560XL)
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Air Traffic Control Provided Assistance; Flight Crew Landed As Precaution; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Returned To Departure Airport
Aircraft
On initial climb-out the cabin was climbing at 4;000 FPM. We leveled off at 5;000 and had ATC put us in a holding pattern. We communicated with our company and decided that the airplane wasn't pressurizing; and returned to [the airport] without further incident.
C560XL cabin failed to pressurize; resulting in an uneventful return to the departure airport.