TM 1-1510-223-10
Table 2-5. Oxygen Duration in Minutes 140 Cubic Foot System
CABIN
CREW
TOTAL
DURATION
PRESSURE
MASK
FLOW
IN
ALTITUDE
CONDITION
LPM-NTPD
MINUTES (1)
TWO MAN
35,000
100%
6.3
512.1
CREW
31,000
100%
8.4
384.0
25.000
100%
11.8
273.3
20,000
100%
15.2
212.2
20,000
NORMAL
7.2
448.0
15,000
100%
19.0
169.7
15,000
NORMAL
10.2
316.2
10,000
100%
23.8
135.5
10,000
NORMAL
13.8
233.7
35,000
100%
10.0
323
31,000
100%
12.1
266.6
25,000
100%
15.5
208.1
TWO MAN
20,000
100%
18.9
170.7
CREW PLUS
20,000
NORMAL
10.9
295.9
ONE PASS
15,000
100%
22.7
142.1
15,000
NORMAL
13.9
232.1
10,000
100%
27.5
117.3
10,000
NORMAL
17.5
184.3
(1) For 100% capacity of usable oxygen, 3,226 L.
BT00197
shut-off valves are open and if there is pressure in the
cylinders. Each individual places the supply lever (green)
on the regulator control panel to the ON position, and the
diluter lever (white) to the NORMAL OXYGEN position.
d.
Emergency Operation. For emergency operation,
the affected crew member selects the EMERGENCY
position of the emergency pressure control lever (red) on
his regulator control panel. This selection provides 100%
corygen at a positive pressure, regardless of the position
of the diluter control lever.
e.
First Aid Operaton. A first aid oxcygen mask is
installed in the aft cabin area as a supplemental or
emergency source of oxygen. The mask is stowed behind
an overhead cover, placarded FIRST AID OXYGEN -
PULL Removing the cover allows the mask to drop out of
the container, exposing a manual control valve, which
releases oxygen to the mask when placed in the ON
position. After using the mask, the manual valve in the
container must be turned OFF before stowing the mask
and replacing the cover.
f.
Oxygen Duration Examples.
(1) Example one.
(a) Wanted. Duration in minutes of oxygen
at 100% capacity.
(b) Known.
'Iwo man crew plus one
passenger, cabin pressure altitude =15,000 feet, crew
masks, normal, 100% capacity.
(c) Method. Find "two man crew plus one
pass " line (table 2-5), move right then down to 15,000 -
"normal", read 232.1 minutes.
(2) Example two.
(a) Wanted. Duration of oxygen for previous
example data at 84% of capacity.
(b) Known. 232.1 minutes duration at 100%,
84% capacity, total aircraft flow = 13.9 LPM.
(c) Method. Multiply 232.1 X 0.84 = 194.9
minutes, or Multiply 3,226 X 0.84 =2709.8, divide by 13.9
LPM = 194.9 minutes.
(3) Example three.
(a) Wanted.
Duration
of
oxygen
for
complement at other cabin pressure altitude, at less than
100% capacity.
(b) Known. -Cylinder at 84% capacity,
100% capacity = 3,226 L, cabin pressure altitude = 21,000
feet
2-56
