TM 55-1510-222-10located in the unpressurized portion of the aircraftbehind the aft bulkhead, lower the pressure in thesystem to 400 PSI, and route oxygen to the regulatorcontrol panels. Both cylinders are interconnected, sorefilling can be accomplished through a single fillervalve located in the aft right side of the fuselageexterior. A pressure gage is mounted in conjunctionwith the filler valve, and each cylinder has a pressuregage. Table 2-4 shows oxygen flow planning rates vs.altitude. Table 2-5 shows oxygen duration capacities ofthe system.Table 2-4. Oxygen Flow Planning Rates vs Altitude(All Flows In LPM Per Mask At NTPD)NOTES:(1) Based on minute volume of 20 LPM-BTPS (Body Temperature and Pressure Saturated).(2) Use 100% oxygen above 20,000 feet(3) Not recommended for other than emergency descent use above 25,000 feet.If average climb or descent flows are desired, add the values between altitudes and divide by the number values used.For example, to determine the average rate for a uniform descent between 25,000 feet and 15,000 feetperform the following:5.9 + 6.2 + 6.6 + 6.9 + 7.2 + 7.6 + 3.9 + 4.2 + 4.5 + 4.8 + 5.1 11 = 5.7 LPMThis method is preferred over averaging the extremes as some flow characteristics vary in such a way as toyield an incorrect answer.2-52
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