TM 1-1510-262-10
Table 2-4.
Oxygen Flow Planning Rates vs. Altitude (All Flows in LPM per Mask at NTPD)
CREW MASK
CABIN PRESSUREALTI-
NORMAL(DILUTER
TUDE IN FEET
DEMAND) (1)
CREW MASK 100%(1)
PASSENGER MASK
35,000
3.1
-0-(2)
3.7 (3)
34,000
3.4
-0-(2)
3.7 (3)
33,000
3.7
-0-(2)
3.7 (3)
32,000
3.9
-0-(2)
3.7 (3)
31,000
4.2
-0-(2)
3.7 (3)
30,000
4.4
-0-(2)
3.7 (3)
29,000
4.7
-0-(2)
3.7 (3)
28,000
5.0
-0-(2)
3.7 (3)
27,000
5.3
-0-(2)
3.7 (3)
26,000
5.6
-0-(2)
3.7 (3)
25,000
5.9
3.7
-0-(2)
24,000
6.2
3.7
-0-(2)
23,000
6.6
3.7
-0-(2)
22,000
6.9
3.7
-0-(2)
21,000
7.2
3.7
-0-(2)
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
12,000
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 lows 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 + 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 low characteristics vary in such a way as to
yield an incorrect answer.
2-60
