Saracini Aviation Safety Act of 2017 This bill requires the Federal Aviation Administration to issue an order to require: (1) the installation of secondary barriers, other than the cockpit door, to prevent access to the flight deck of each covered aircraft; (2) such barriers on the aircraft with a cockpit door to remain locked while the aircraft is in flight and the cockpit door separating the flight deck and the passenger area is open; and (3) such barriers on the aircraft without a cockpit door to remain locked as determined by the pilot in command. "Covered aircraft" is defined as a commercial aircraft: (1) equipped with more than 75 passenger seats, and (2) with a maximum gross takeoff weight of more than 75,000 pounds.