PIPER SENECA II SERVICE MANUAL
01/01/09 XIV - ACCESSORIES AND UTILITIES
3C22E
14-92. FACE MASKS. (Fixed System)
14-92a. CLEANING.
a. Remove the sponge rubber discs from the mask turrents. Do not use soap to clean sponge rubber
discs, as this would deteriorate the rubber and give off unpleasant odors. Clean in clear water and
squeeze dry.
b. Wash the rest of the mask with a very mild solution of soap and water.
c. Rinse the mask thoroughly to remove all traces of soap.
d. 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 ethyl
alcohol.
14-92b. REFILLING
CA
UTION: BEFORE SERVICING THE OXYGEN SYSTEM, MAKE SURE THE AIRCRAFT IS
SECURELY GROUNDED ELECTRICALLY.
CA
UTION: DO NOT OPERATE ELECTRICAL EQUIPMENT WHILE SERVICING OXYGEN
SYSTEM.
CA
UTION: DO NOT ATTEMPT TO TIGHTEN ANY CONNECTIONS WHILE THE SYSTEM IS
CHARGED.
Refilling of oxygen systems should be done by qualified personnel. For comparison of filling pressures to
ambient temperatures, refer to Table XIV-VIIIA. The following are parameters to be followed for filling.
a. Only aviators breathing oxygen (MIL-0-27210) and appropriate filling equipment should be used to
fill the system.
b. If a cylinder has less than 5 psi pressure or has insufficient pressure to produce an audible hissing
sound when the valve is cracked, it should be removed and/or purged, and if the condition has
existed for a significant length of time, hydrostatically test cylinder.
c. Make sure both the charge valve and recharge cart fittings are clean and free of contamination.
TABLE XIV-VIIIA. FILLING PRESSURES FOR CERTAIN AMBIENT TEMPERATURES
Ambient Temperature °F/°C Filling Pressure Ambient Temperature °F/°C Filling Pressure
0/-17.78 1650 (PSI) 70/21 1975 (PSI)
10/-12.22 1700 80/27 2000
20/-6.67 1725 90/32 2050
30/-1.11 1775 100/38 2100
40/4.44 1825 110/43 2150
50/10 1875 120/49 2200
60/15.56 1925 130/54 2250
NO
TE: Filling pressures are for 1850 PSI at 70°F (21.11°C). Table assumes 25°F (11.8°C) rise due to
heat of compressor with max. fill rate.
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