TM 1-1510-223-10 Table 2-4.  Oxygen Flow Planning Rates Vs Altitude (All Flows in LPM Per Mask at NTPD) CABIN PRESSURE CREW MASK CREW MASK PASSENGER ALTITUDE IN FEET NORMAL(DILUTER 100% MASK DEMAND) (1) (1) 35,000 -0-(2) 3.1 3.7 (3) 34,000 -0-(2) 3.4 3.7 (3) 33,000 -0-(2) 3.7 3.7 (3) 32,000 -0-(2) 3.9 3.7 (3) 31,000 -0-(2) 4.2 3.7 (3) 30,000 -0-(2) 4.4 3.7 (3) 29,000 -0-(2) 4.7 3.7 (3) 28,000 -0-(2) 5.0 3.7 (3) 27,000 -0-(2) 5.3 3.7 (3) 26,000 -0-(2) 5.6 3.7 (3) 25,000 -0-(2) 5.9 3.7 24,000 -0-(2) 6.2 3.7 23,000 -0-(2) 6.6 3.7 22,000 -0-(2) 6.9 3.7 21,000 -0-(2) 7.2 3.7 20,000 3.6 7.6 3.7 19,000 3.9 7.9 3.7 18,000 4.2 8.3 3.7 17,000 4.5 8.7 3.7 16,000 4.8 9.1 3.7 15,000 5.1 9.5 3.7 14,000 5.4 10.0 3.7 13,000 5.8 10.4 3.7 12,00 6.1 10.9 3.7 11,000 6.5 11.3 3.7 10,000 6.9 11.9 3.7 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 of values used. For example, to determine the average rate for a uniform descent between 25,000 feet and 15,000 feet perform 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 LPM This method is preferred over averaging the extremes as some flow characteristics vary in such a way as to yield an incorrect answer. BT00196 places  the  supply  control  lever  on  the  regulator  control panel to the ON position, puts on and adjusts his mask, selects TEST MASK position, and checks for leaks. If   any   symptoms   occur   suggestive   of   the   onset   of hypoxia,    immediately    set    the    emergency    pressure control lever to the EMERGENCY position and descend below 10,000 feet Whenever carbon monoxide or other noxious   gas   is   present   or   suspected,   set   the   diluter control  lever  to  100%  oxygen  and  continue  breathing oxygen until the danger is past c. Normal Operation.      Oxygen pressure is maintained at all times to the regulator control panels if the cylinder 2-55