Challenger CL604
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
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 Took Evasive Action; Flight Crew Requested ATC Assistance / Clarification; General Flight Cancelled / Delayed; General Maintenance Action
Aircraft
Cabin pressurization seen by crew to increase rapidly. Shallowed climb; consulted QRH. Manual mode momentarily allowed control; then cabin continued to climb with airplane. Amber then Red EICAS (Engine Indicating and Crew Alerting System) illuminated and Passenger Oxygen Masks deployed. Leveled aircraft at 10;100 ft MSL; [requested priority handling]. Vectored for ILS return. No injuries or damage occurred.
Captain reported cabin pressure controllability issues caused an air turn back and precautionary landing.