The present invention relates to a process for preparing fluoroalkyl nitriles by reacting fluorinated carboxamides with halides and fluorinated carboxylic acids. These oxygen converters and oxygen cylinders are components of the onboard oxygen supply systems of aircraft. PE1 also tells PE2 to tag any thus-destined packets with a particular tag T3. One or more boards may further be secured between the posts with catches and secured to the plate with couplers.