Cessna 402C - Page 271

Co.~·402C
MODEL
SECTION 8
HANDLING. SERVICE & MAINTENANCE
I
Check oil level before each f1 ight. Do not operate on less than 9
quarts. To minimize loss of oil through breather, fill to lO-quart levell
for normal flights of less than three hours. For extended flight, fill to
capacity which is 13 quarts for each engine sump including one quart for
oil filter.
OXYGEN (Aviators Breathing Oxygen - Specification MIL-O-27210)
Check pressure gage for anticipated requirements before each f1 ight.
Refill whenever pressure drops below 300 PSI.
The small oxygen cy1 inder, when fully charged and allowed to stabll ize
at a temperature of 21.1
o
C (70°F), contains approximately 44.0 cubic feet
of oxygen under a pressure of 1800 PSI. The large oxygen cyl inder, when
fully charged and allowed to stabilize at a temperature of 21.1°C (l0°F),
contains approximately 114.9 cubic feet of oxygen under a pressure of 1850
PSI.
Filling pressures will vary, however, due to the ambient temperature
in the filling area. and because of the temperature rise resulting from
compression
of the oxygen. Because of this, merely filling to 1800 or 1850
PSI will not result in a properly filled cylinder. Fill to the pressures
indicated in Figure 8-2 for the ambient temperature .
.-------1 WARNING .-----,
Oil, grease, or other lubricants in contact with
oxygen create a serious fire hazard, and such con-
tact must be avoided when handling'oxygen equipment.
The oxygen
cylinder is serviced through a filler valve accessible
through the right nose baggage door.
OXYGEN SERVICING TABLE
AMBIENT FILLING AMBIENT
FILLING
TEMPERATURE PRESSURE TEMPERATURE
PRESSURE
°c
OF
PSIG
°C
OF
PSIG
-17.8 0
1600
21.1 70 1925
-12.2 10
1650 26.7
80 1950
-6.7
20 1675 32.2 90 2000
-1.1
30 1725
37.8 100 2050
4.4 40 1775
43.3 110
2100
10,0
50 1825
48,9
120 2150
15,6 60 1875
54.4
130
2200
THE NUMBERS SHOWN ABOVE ARE APPLICABLE TO 1800 PSI
OXYGEN BOTTLES. IF AN 1850 PSI OXYGEN BOTTLE IS
INSTALLED, INCREASE EACH FILLING PRESSURE BY 50 PSI
F19ure 8-2
AIR CONDITIONING RESERVOIR (Hydraulic Fluid Mll-H-S606)
Check reservoir fluid level above screen bottom. Reservoir capacity is
2.75 quarts.
1 November 1979 8-13
Revision 4 - 1 December 1983