Piper SENECA III - Page 254

SECTION 9
PIPER
AIRCRAFT
CORPORATION
SUPPLEMENT 2
PA-34-220T,
SENECA
Ill
This
fixed
oxygen
system
provides
supplementary
oxygen
for
the
crew
and
passengers
during high
altitude Ilights
(above
10,000
fectL The
major
components
of
the
Scott
oxygen
system
are a
63
cubic
foot
oxygen
cylinder,
an
oxygen
supply
gauge,
an
ON-OFF
flow
control
knob.
a
pressure
regu-
lator.
six
plug-in
receptacles and
six
oxygen
masks.
On
some
models
the
oxygen
cylinder is
mounted
aft
in
the
tail
cone.
When
fu
Ily
charged.
the
cylinder
comains
oxygen
at
a pressure
of
1850
psiat
70°F
Ihe
oxygen
supply
gauge
is
mounted
in
the
aft overhead
vent
duct.
The
oxy
gen
flow
control
knob.
Iabefed
"Oxygen
Pull-On"is
mounted in
the
pilot
s
oxerhead
panet
The
pressure
regulator
is
moumed
directly
on
the
ox)
gen
cylinder,
once
the
oxygen
flow
control
knob
is
ora
cach
of the
oxygen
plug-in
receptacles
operates
as an
automatic
on-off
valve.
The
oxygen
cvlinder
can
be
recharged
through
the
access
door
aft of
the
rear
windowan
the
left side
of the
fuselage
On
other
models
the
oxygen
cylinder
is
mounted
in
the
forward baggage
compartment.
When
fully
charged.
the
cylinder
contains
oxygen
at
a
pressure
of
1850
psi
at
70°F.
The
oxygen
supply
gauge
is mounted
in
the
co-pilot's
instrument
panel.
The
oxygen
flow
control
knob labeled "Oxygen
Pull-On"
is
also
mounted
in
the
copilot's
instrument
panet The
pressure
regulator
is
moumed
directly
on
the
oxygen
cylinder,
once
the
oxygen
flow
control
knob
is
on,
each
of the
oxygen
plug-in
receptacles
operates
as an
automatic
on-oiT
vabe.
The
oxygen
cylinder
can
be
recharged
through.the
forward
baggage
compartment
on
the
left
side of the
fuselage.
If
high
altitude
flight
is
anticipated.
it
should be
determined
that the
oxygen
supplyis
adequate
for
ttle
proposed
flight
and
that
the
passengers
are
briefed.
When.oxygen
is
required, the
control knob
should
be
pufled
to
the
O%
position,
allowing.oxygen
toflow
from
the
cylinder through the
system.
Connecting
the
constant
flow mask
fitting
to
a
receptacle
and
turning
it
90
degrees
clockwise,
automatically releases
oxygen
to
the
mask
through
the
on-off valve
feature
of
the
receptacle.
The
occupant
then
dons
the mask
and
breathes
normally
for
a
sufficient
supply
of
oxygen.
Each
mask
assembly
oxygen
line incorporates
a
flow
ind-icator. When
the red
pellet
in
the
indicator
disappears,
oxygen
is flowing
through
the
line
normally
If
the red
indicator
appears
in
any
of
the
lines during
a
period
when
oxygen
use
is
essentiat
the
airplane
should
be
lowered
to
a
safe
altitude
immediately.
When
not
in
use,
mask
may
be
stowed
in
the
storage
pockets
behind
the
front
and
center
seats.
Always
remove
fittings from
the
oxygen
receptacles
REPORT:
VB-Ill0
ISSUED: JANUARY 8, 1981
9-10
2
of
4
REVISED: FEBRUARY
10, 1984