PIPER COMANCHE SERVICE MA~l'AL • TABLE 1I~1I1. I\OICATEO OXYGE\ CYU\OER PRESSl"RES FOR GIVE' AMBIE~T TEMPERATURES I\OICATED CYU\OER PRESS. TE~IPERATl'REOF PSI 110 19~O 100 19].5 90 1890 SO IK45 70 \tWO 60 1155 50 1710 40 1665 2-5R. Filling Oxygen Cvllnder, The filler valve for the oxygen system is accessible through a door located on the left side of the fuselage just aft of the rear window. a. To fill th, oxygen cylinder. open the access door. remove the cap from the filler valve and attach the filler ho e from the oxygen recharge unit to the filler valve. Ascertain that all fittings are free from oil. .... grease. dirt. etc.
\OTE • If the airplane's oxygen cylinder pressure is below 50 psi. the system should be purged as descri bed in Paragraph 2~71. b. To obtain the correct filling pressure for the oxygen cylinder at various ambient temperatures a chart ha.. been included for your convenience. The pressures given are not exact. but sufficiently accurate for practical purposes of \\ orking pressure between 1800 and 2400 psig cylinders. The cylinder should be a110\\ed to cool to a ....tabilized temperature after filling before checking against the figures given in Table It-III. c. When using a recharge unit consisting of one supply cylinder.
slowly open the valve of the supply unit and allow the oxygen to transfer. d. When using a recharge unit consisting of two or more supply cylinders (cascade storage systerm, it i.. recommended that the following procedure be used: • REVISED: 4/3/78 icu HA~DLI~G A~D SERVICI~G TE~IPERATl'REOF I\OICATED CYU\OER PRESS. PSI 110 100 90 SO 70 60 50 40 19~O 19].5 1890 IK45 \tWO 1155 1710 1665