1111111
.....
al
OXYGEN SYSTEM (CONT)
4. Deploy passenger oxygen
if
pressurization irregularities are
encoun-I
tered above 10,000 feet
MSL.
-_NOTE
...
The rebreather bag may not inflate even though oxygen
,.
is
flowing.
This
is
normal.
CREW OXYGEN
1. If oxygen
is
required
by
the crew only, PASS OXY
Valve
-
OFF.
2.
When oxygen masks are worn
by
the crew,
OXY-MIC
SWitch(es)-
ON. Communication between crew members can
be
accomplished
by
using the INPH function
of
the audio control panel and increas-
ing the
MASTER
VOL
level.
3.
Crew Oxygen
Masks:
• Operate
ZMR
100
series diluter-demand crew masks
as
follows:
a.
With
100%
OXY
position (control lever down) selected on the
mask regulator, the mask
will
provide 100% oxygen at
all
cabin
altitudes. Maintain the 100%
OXY
position on undonned
masks to reduce crew member action
in
the event of pressur-
ization system failure or smoke
in
the cabin. 100%
OXY
must
be
selected
for
cabin altitudes above 20,000 feet.
b. With
NORMAL
position (control lever
up)
selected on the
mask regulator, the mask
will
deliver diluted oxygen. When
using oxygen at cabin altitudes below 20,000 feet, the
NOR-
MAL
position should
be
selected to conserve oxygen and pro-
vide
greater oxygen duration times.
• Operate
6600214
series masks with Robertshaw regula-
tors
as
follows:
a. With
NORMAL
selected on the Pressure Regulator Control
and "normal" (100% lever locked
up)
selected on the Diluter
Control, the crew mask
will
deliver automatic oxygen dilution
from S.L. to 30,000 feet cabin altitude. Above 30,000 feet
cabin altitude, the mask will provide 100% oxygen and main-
tain a slight positive pressure.
b.
To obtain 100% oxygen at any time, depress 100%
lever.
c. For emergency operation, select
EMERGENCY
on the Pres-
sure Regulator Control and depress 100% lever on the Diluter
Control.
With
the regulator controls
in
this position, the crew
mask will deliver 100% oxygen and maintain a slight positive
pressure for respiratory protection from smoke and fumes.
FAA
APPROVED
4-30-76
REISSUED
2-25-81,
CHANGE
12
2-53
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