Learjet 35
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Flight Crew Last 90 Days 130; Flight Crew Total 7000; Flight Crew Type 3000
Troubleshooting
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Provided Assistance; Flight Crew Returned To Departure Airport; Flight Crew Landed As Precaution; Flight Crew Requested ATC Assistance / Clarification; General Maintenance Action
Aircraft
During the climb out phase while passing through 16;000 ft. conducting the climb checklist we realized our cabin was not pressurized. I immediately asked for a descent to 10;000 ft. ATC told me it would be a moment so I requested priority handling; squawked 7700 and initiated my immediate descent procedures in accordance with the airplane flight manual. We got down to 10;000 ft. safely and then landed without incident.
Captain reported cabin did not pressurize on climb and performed an air turn back and precautionary landing.