TM 55-1510-219-10
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.
WANTED
Duration of oxygen for comple-
ment at other cabin pressure al-
titude, at less than 100% capaci-
ty.
KNOWN
Cylinder at 84% capacity, 100%
capacity = 3,226 L, cabin pres-
sure altitude = 21,000 feet.
I crew mask = 7.2 LPM (100%),
I passenger mask = 3.7 LPM
METHOD
Multiply 3,226 L X 0.84 = 2.
709.8 L, multiply 2 crew X 7.2
LPM = 14.4 LPM, multiply 1
passenger X 3.7 LPM, add 14.4
LPM crew plus 3.7 LPM passen-
ger = 18.1 LPM.Divide 3,226 L
by 18.1 LPM = 178.2 minutes.
h.
Oxygen Cylinder Capacity Example Problem.
WANTED
a.
Percent of capacity at known pressure and
temperature.
b.
Pressure when temperature decreases.
KNOWN
Pressure = 1,600 PSIG stabi-
lized cylinder temperature is es-
timated at 20° C decreased stabi-
lized cylinder temperature is es-
timated at -30° C.
METHOD
c.
Enter 1600 PSIG move up to 20° C line, move
right to 84%.
d.
Move left on 84% line to -30° C line, move down
to 1250 PSIG.
WANTED
100% capacity pressure at
known temperature.
KNOWN
Temperature -- -30° C.
METHOD
Move left along 100% line to
-30° C line and move down to
1420 PSIG.
2-62. WINDSHIELD WIPERS.
a.
Description. Two electrically operated windshield
wipers, are provided for use at takeoff, cruise and landing
speed.
A
rotary
switch
(fig.
2-18)
placarded
WINDSHIELD WIPER, located on the overhead control
panel, selects mode of windshield wiper operation. An
information placard above the switch states: DO NOT
OPERATE ON DRY GLASS. Function positions on the
switch, as read clockwise, are placarded: PARK OFF
SLOW FAST. When the switch is held in the spring-
loaded PARK setting, the blades will return to their normal
inoperative position on the glass, then, when released, the
switch will return to OFF position terminating windshield
wiper operation. The FAST and SLOW switch positions
are separate operating speed
2-51
Table 2-5. Oxygen Duration in Minutes 128 Cubic Foot System
