Cessna 402B 1973 - Page 39

NOTE
The
pilot
should
always
select
the red hose
assem-
bly
since
it
provides
the highest
oxygen
flow
rate.
OXYGEN
SYSTE'VI
OPERATION
The or<ygen system
is activated by
pulling
the oxygen
krob
to the
ON
position,
allowing
oxygen
to flow from
the
regulator
to aLl
cabin
ouilets.
A
normally
closed
valve
in
each
oxygen outlet
is opened
by inserting
the
connector
of the
mask
and
hose assembly.
After flights
using oxygen,
the
pilot
should
ensure
that the
o(ygen
system has
been
inactivated
by
unplugging
all masks
and
pushing
the
oxygen
gtto6
sqmpletely
to ilre
OFF
position.
NOTE
If the
oxygen
knob is
left in
an
intermediate
position
between
ON
and
OFF,
it may allow low
pressure
oxygen
to bleed through
the
regu.lator
into
the
nose
compartment
of the aircraft.
Before Flight
(1)
Oxygen Knob
- PULL-ON.
(2)
O<ygen
Pressure
Gage
-
Check
for
sufficient
pressure
for anti-
cipated
flight
requirements.
(See
Figure
2-10.
)
(3)
Check
that
oxygen masks
and hose
asiemblies
are available.
During
Flight
WARNING
Permit
no
smoking
when using
oxygen.
Oil
grease,
soap,
lipstick,
lip
balm,
and other
fatty
materials
constitute
a
serious fire
hazard
when in
contact with
oxygen..
Be
sure
hands
and clothing
are oil-free
be-
fore
handling
oxygen
equipment.
(1)
Hose
Assembly
- Select
proper
hose
assembly for altitude.
(2)
Mask
-
Connect
mask
and
hose assembly
and
put
mask on.
2-3
0