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
