TM 1-1510-218-10
2-83
Table 2-6. Oxygen Duration in Minutes for 49 Cubic Foot System
CABIN
PRESSURE
ALTITUDE
CREW MASK
CONDITION
TOTAL FLOW
LPM-NTPD
DURATION IN
MINUTES (1)
NOTE
When operating with a 100% cylinder capacity, read the duration in minutes directly from the
table. However, if operating with less than a 100% cylinder capacity pressure (reference
Figure 2-25), perform the following computation: Total crew (2) LPM usage at cabin pressure
altitude; Total passenger LPM usage at cabin pressure altitude; Total LPM usage of both crew
and passengers. Multiply 1222 liters times the percent of rated capacity at NTPD and divided
by total crew and passenger LPM usage to obtain total (oxygen remaining) duration in
minutes.
31,000
100%
8.4
145.5
20,000
100%
15.2
80.4
20,000
NORMAL
7.2
169.7
15,000
100%
19.0
64.3
15,000
NORMAL
10.2
119.8
10,000
100%
23.8
51.3
TWO MAN CREW
10,000
NORMAL
13.8
88.6
31,000
100%
12.1
101.0
20,000
100%
18.9
64.7
20,000
NORMAL
10.9
112.1
15,000
100%
22.7
53.8
15,000
NORMAL
13.9
87.9
10,000
100%
27.5
44.4
TWO MAN CREW
PLUS ONE PASS
10,000
NORMAL
17.5
69.8
31,000
100%
15.8
77.3
20,000
100%
22.6
54.1
20,000
NORMAL
14.6
83.7
15,000
100%
26.4
46.3
15,000
NORMAL
17.6
69.4
10,000
100%
31.2
39.2
TWO MAN CREW
PLUS TWO PASS
10,000
NORMAL
21.2
57.6
31,000
100%
19.5
62.7
20,000
100%
26.3
46.5
20,000
NORMAL
18.3
66.8
15,000
100%
30.1
40.6
15,000
NORMAL
21.3
57.4
10,000
100%
34.9
35.0
TWO MAN CREW
PLUS THREE PASS
10,000
NORMAL
24.9
49.1
