What was found
ON 1/20/2026, LEAR 60 N317MP CYO317 DEPARTED KAPF HEADING TO KSUS. AS THE AIRCRAFT WAS CLIMBING, THE CAPTAIN REPORTED THE AIRCRAFT DID NOT PRESSURIZE. HE SWITCHED TO MANUAL MODE AND STILL DID NOT. HE THEN ELECTED TO DIVERT INTO KRSW. LOCAL MAINTENANCE WAS CALLED TO INVESTIGATE THE ISSUE. IT WAS DECIDED TO START WITH THE PRESSURIZATION CONTROLLER. THE UNIT WAS REPLACED AND AIRCRAFT RELOCATED TO A BETTER EQUIPPED MAINTENANCE FACILITY. ON THE SHORT FLIGHT TO KBCT, THE AIRCRAFT STILL DID NOT START THE PRESSURIZATION PROCESS. THE FLIGHT WAS SHORT ENOUGH THAT IT WAS NOT NEEDED. THE AIRCRAFT IS OUT OF SERVICE UNTIL THE ISSUE IS RESOLVED AND A VALID TEST FLIGHT IS COMPLETED.