PIPER COM:\~CH[ SERVICE ~ANt'Al 2-71. Purging Oxygen System. The system should be purged whenever the cylinder pressure falls hell1\\. psi or if any lines are left open for any length of time. Also. whenever there are any offensiv e odors present. . will be necessary to purge the system. l.'se the folio .... ing procedure: a. Park the airplane in a '0 SMOKI,G area. b. Keep all doors and windows open. c. Be -ure all electrical systems are shut off. d. Connect the oxygen recharging unit to the filler valve. e. Plug the oxygen masks into the outlet valves and turn on the system. f. Set the recharging unit pressure regulator to deliver 50 psi and let the system purge for one hour.
II any odor is ... till present. repeat the procedure for one or more hours. If the odor persists after the -econd purging. replace the cylinder. 1-72. Cleaning of Face ~asks. The di.. posable masks are designed for one-time use and require no maintenance. The pilot's and copilot's masks can be cleaned as follows: a. Remove the microphone from the mask. b. Remove the sponge rubber discs from the mask turrnets. Do not use soap to clean sponge rubber discs. as this would deter iorae the rubber and gi\ e off unpleasant odors. Clean in clear water and squeeze drv. c. Wash the rest of the mask with a very mild solution of soap and water, d.
Rinse the mask thoroughly to remove all traces of soap, e. Make sure the sides of the breathing bag do not stick together while drying. as this may decrease the life of the rubber in the bag. The mask can be sterilized with a solution of 70 percent eth~1 alcohol. TABLE II-\". TROl'BLESHOOT"G CHART (OXYGE' SYSTE~1) HA!"DLI~G A~D SER\"ICI. ADDED: 4/3/78 leIS Trouble Cause • Remedy Charge system and check for leaks. Replace pressure gauge. Replace regulator assernbly Purge the oxygen system. Refer to Pa ra- graph 2671. '0 indication of pre-sure on pressure gauge. Cylinder empty or leak in ..ystem has exhausted pressure. Pressure gauge defective.
Pressure indication normal hut no oxygen flowing, Oxygen cylinder regulator assembly defective. Replace regulator assernbly Ottcn-iv I.' odors in ox~ gen. Cylinder pressure below 50 psi, Foreign matter has entered the svstern during previous servicing, Purge the oxygen system. Refer to Pa ra- graph 2671.