Learjet 75
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 128; Flight Crew Total 8817; Flight Crew Type 415
Aircraft Equipment Problem Critical
Air Traffic Control Provided Assistance; Flight Crew Returned To Departure Airport; Flight Crew Took Evasive Action; Flight Crew Landed in Emergency Condition; Flight Crew Overcame Equipment Problem
Aircraft
A rapid decompression was experienced in between FL180 to FL200 approximately; the RED CAS message 'CABIN ALTITUDE' was displayed and no previous alert or any other signal that would alert the crew of this situation was shown by the systems. Crew performed an [expedited descent] as indicated by memory items and then double check the procedures with the QRH. [Priority handling was requested] with Center and the flight return safely to the departure airport ZZZ.No written report or any other information where required by ZZZ Tower; the PIC called the Tower via phone and talked with the Supervisor on duty at that time. Nor any other authority requested further information to the flight crew regarding this incident.
Lear 75 Captain reported a loss of pressurization during climb that resulted in a return to the departure airport.