Personal Protective Equipment and Self-Contained Breathing Apparatus No. 1 Questions taken from Jones & Bartlett Fundamentals of Fire Fighter Skills (3rd Edition) Progress Indicator: Question 1 of 23 1.  What is the first step that should be taken when replacing an SCBA cylinder on another fire fighter? p. 78 Choices: Remove the regulator or the face piece Release the SCBA cylinder from backpack assembly Turn off the cylinder valve on the used cylinder Disconnect the high-pressure supply hose