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OXYGEN SYSTEM (CONT)
2-54
• Operate
6600214
series crew masks with Puritan-Bennett
regulators
as
foUows:
a. With NORM selected on the Pressure Regulator Control, the
crew mask
will
deliver automatic oxygen dilution from
S.L
to
33,000
feet cabin altitude and 100% oxygen above
33,000
feet cabin altitude. Automatic positive pressure breathing is
provided above
39,000
feet cabin altitude.
b. To obtain
100%
oxygen
at
any time, select
100%
on
the Pres-
sure Regulator Control.
c. For emergency operation, select
EMER
on
the
Pressure Regu-
lator Control. With
the
regulator control
in
this position, the
crew mask
will
deliver
100%
oxygen, maintain a slight positive
pressure in
the
mask cup
at
all
times for respiratory protection
from smoke
or
fumes, and automatic positive pressure breath-
ing above
39,000
feet cabin altitude .
• Operate Scott
ATO
masks
as
foUows:
a. To check for oxygen availability to the mask while stowed,
depress
the
PRESS
TO
TEST buttonlknob on the bottom of
mask pressure regulator - oxygen
will
flow
while button
is
held.
b. To don
crew
oxygen masks:
c.
(1)
Remove hats and "ear muff" type headsets.
Headsets and eyeglasses worn
by crew members may
interfere with quick-donning capabilities.
(2)
Squeeze and hold the
red
handles on
the
mask pressure
regulator together
to
inflate the pneumatic harness for
donning.
(3)
Position harness over the head, position mask as desired,
then release red handles.
(4)
Ensure that mask
is
properly sealed. Reposition mask
if
required.
Beards worn by crew members may make proper seal-
ing of the mask more difficult.
With the
100%
lever extended and
the
PRESS
TO
TEST but-
ton/knob
rotated to the
.,
pOSition,
the mask
will
deliver auto-
matic oxygen dilution from
S.L
to
30,000
feet cabin altitude,
100% oxygen above
30,000
feet cabin altitude, and automatic
pressure breathing above approximately
37,000
feet cabin
altitude.
FAA
APPROVED
4-30-76
REISSUED
2-25-81,
CHANGE
10
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