What was found
PASSING 17,000 FEET, RECEIVED A CABIN ALT HIGH YELLOW CAS. THE DELTA P WOULD NOT INCREASE PAST 0.6 PSI. RECEIVED A WHITE CABIN ALTITUDE CAS BEFORE BUT ASSUMED IT WAS ASSOCIATED WITH GOING A HIGH ALTITUDE AIRPORT. TEXTRON REVIEWED THE ARES FILES WITH NO FINDINGS OF A FAILURE OR FAULT WITHIN THE PRESSURIZATION SYSTEM. THIS IS A KNOWN ISSUE WHERE FMS MODE DROPS FROM THE FLIGHT MANAGEMENT AS THE CABIN ALTITUDE REACHES 8K BECAUSE OF HOW QUICKLY THE AIRCRAFT REACHES ALTITUDE FOR THE SHORT FLIGHT DURATION AND HIGHER ELEVATION OF THE DEPARTURE/ARRIVAL AIRFIELDS WITHIN THE FLIGHT PLAN COMPARED TO THE SPECIFIED RATE THAT THE PRESSURIZATION CONTROLLER MODULATES CABIN PRESSURE.