tional
disturbances.
Also,
the
habitual and
excessive
use
of
tobacco
or
al-
cohol will usually
necessitate
the
use
of oxygen
at
less
than 10, 000 feet.
NOTE
For
safety
reasons,
no smoking should be allowed
in
the
aircraft
while oxygen
is
being
used.
When
ready
to
use
the oxygen
system,
proceed
as
follows:
(1)
Select
mask
and
hose.
NOTE
The hose provided
for
the
pilot
is
of a
higher
flow
rate
than those
for
the
passengers;
it
is
color-coded
with
an
orange
band
adjacent
to the
plug-in
fitting. The
passenger
hoses
are
color-coded
with a
green
band.
If
the
aircraft
owner
prefers,
he may provide higher
flow
rate
hoses
for
all
passengers.
In
any
case,
it
is
recommended
that
the
pilot
use
the
larger
capacity
hose. The
pilotts
mask
is
equipped with a microphone
to
facilitate
the
use
of the
radio
while using oxygen.
An
adapter
cord
is
furnished with the microphone-
equipped
mask
to
mate
the
mask
microphone
lead
to
the
auxiliary
microphone
jack
located
at
the
left
edge
of the
instrument
panel.
To
connect the oxygen
mask
microphone, connect the
mask
lead
to
the
adapter
cord
and plug the
cord
into the auxiliary microphone
jack.
(In
aircraft
that
are
equipped with the optional boom
microphone,
it
will be
necessary
to disconnect the
boom microphone
lead
from
the
auxiliary
microphone
jack
so
that
the
adapter
cord
from
the oxygen
mask
microphone can be plugged into the jack). A
switch
is
incorporated
on the
pilot's
control wheel to
operate
the microphone.
(2) Attach
mask
to
face and
adjust
metallic
nose
strap
for
snug
mask
fit.
(3)
Select
oxygen outlet located
nearest
to
the
seat
you
are
occupy-
ing, and plug
delivery
hose
into
it.
When the oxygen supply
is
turned
on, oxygen will flow continuously
at
the
proper
rate
of flow
for
any
altitude without any manual
adjustments.
(4)
Position
oxygen supply
control
knob "ON. "
(5)
Check
the flow
indicator
in
the face
mask
hose.
Oxygen
is
flow-
ing
if
the
indicator
is
being
forced
toward the
mask.
(6)
Unplug the
delivery
hose from the outlet coupling when discontin-
uing
use
of oxygen
system.
This
automatically
stops
the flow of oxygen.
(7)
Position oxygen supply
control
knob
"OFF.
!f
OXYGEN
DURATION
CALCULATION.
The Oxygen Duration
Chart
(figure 7 -3) should
be
used
in
determin-
lug
the
usable
duration (in
hours)
of
the oxygen supply in your
airplane.
The following
procedure
outlines the method of finding the duration
from
the
chart.
(1)
Note the available oxygen
pressure
shown on the
pressure
gage.
(2) Locate this
pressure
on the
scale
on the left
side
of the
chart,
then go
across
the
chart
horizontally to the
right
until you
intersect
the line
representing
the number
of
persons
making the fUght.
After
intersecting
the line,
drop
down
vertically
to the bottom of the
chart
and
read
tht: duration in
hours
given on the
scale.
(3) As an example
of
the above
procedure,
1400
psi
of
pressure
will
,II
safely
sustain
the
pilot
only
for
nearly
5 hours and
45
minutes. The
same
pressure
will
sustain
the pilot and
three
passengers
for
approx-
imately
2 hours and
20
minutes.
NOTE
The Oxygen Duration
Chart
is
based
on a
standard
con-
figuration oxygen
system
having one orange COlor-coded
hose
assembly
for
the pilot and
green
color-coded
hoses
for
the
passengers.
If
orange
color-coded
hoses
are
provided
for
pilot and
passengers,
it
will be
necessary
to compute new oxygen duration
figures
due to the
greater
consumption of oxygen with
these
hoses.
This
is
accom-
plished by computing the
total
duration available to the
pilot only (from
"PILOT
ONLY" line on chart), then
di-
viding
this
duration by the number of
persons
(pilot
and
passengers)
using oxygen.
OXYGEN
SYSTEM SERVICING.
The oxygen
cylinders,
v,hen fully charged, contain 44 cubic
feet
of
oxygen (22 cubic feet
each
cylinder), under a
pressure
of 1800
psi
at
70°F. Filling
pressures
will
vary,
however, due to the
ambient
temper-
lature
mthe
filling
area,
and heoause
of
the temperature
rise
result~_15
d
7-14
To Next Page
Loading...
