Domanda 175, Operational Procedures - ATPL - Airline Transport Pilot license

You descend to the flight level corresponding to the indicated cabin altitude or the safety altitude if higher and take preventive steps by putting yourself in a landing approach configuration.
You go down to the level corresponding to the indicated cabin altitude and keep the airplane in a clean configuration until the final approach.
You climb to the maximum flight level which does not need the use of pressurization.
You carry out an emergency descent to reach the safety altitude.