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cylinder.
(d) Gauge Lines:
Dedicated gauge lines are installed to allow viewing of
cylinder pressure. The crew cylinder gauge line begins as a
single line leaving the regulator assembly. It is then divided
downstream into two lines: one line connecting to the direct
reading gauge on the oxygen servicing panel (left forward
OPERATING MANUAL
2A-35-00 PRODUCTION AIRCRAFT SYSTEMS
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May 30/02
Revision 7
nose section); the other line connecting to the direct reading
gauge on the oxygen control panel (pilot’s skirt panel).
The passenger cylinder gauge line begins as a single line
leaving each regulator assembly. Both lines then join to form
a common line. Further downstream, the single line is divided
into two lines: one line connecting to the direct reading gauge
on the oxygen servicing panel (left forward nose section); the
other line connecting to the direct reading gauge on the
oxygen control panel (pilot’s skirt panel).
Flow restrictors are incorporated so that should a gauge line
rupture, the resulting oxygen loss rate would be limited to
approximately one liter per minute.
(e) Overboard Discharge Line:
Two overboard discharge lines (passenger and crew) are
installed to vent oxygen overboard through ports located on
the left fuselage, forward of the wing leading edge. The
forward discharge port is used by the passenger oxygen
system; the aft discharge port is used by the crew oxygen
system. The cylinder regulator will allow overboard discharge
under the following conditions:
• Regulated oxygen pressure exceeds 90 psi, activating
the regulator’s relief valve
• Oxygen cylinder pressure exceeds 2775 psi, rupturing
the regulator’s high pressure burst disk
• Oxygen temperature exceeds 225 (±5)° F, melting the
regulator’s high pressure burst disk
Each overboard discharge port is covered by a overboard
discharge disk. See Figure 3. In addition to preventing
contaminants from entering the overboard discharge line, the
disk serves as a visual indicator to the flight crew that an
overboard discharge has occurred, by being blown out and
off the discharge port. It is green in color and labeled OXY.
H.P. RELIEF.
B. Oxygen Servicing Panel:
(1) Airplanes SN 1000 through 1289:
(See Figure 4.)
The oxygen servicing panel is located under an access door on the
left forward nose section. The panel consists of an external high
pressure filler valve and a direct reading pressure gauge for the
crew oxygen system. The filler valve, with chain and cap, is
connected via a single fill line to the oxygen cylinder regulator and
provides a point for servicing the system. The direct reading
pressure gauge allows the crew oxygen system pressure to be
checked at the panel.
(2) Airplanes SN 1290 and Subsequent:
(See Figure 5.)
The oxygen servicing panel is located under an access door on the
left forward nose section. The panel consists of two external high
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-35-00
Page 5
May 30/02
Revision 7
pressure filler valves and two direct reading pressure gauges: the
upper set for the passenger oxygen system; the lower set for the
crew oxygen system.
The passenger oxygen system filler valve, with chain and cap,
provides a point for servicing the system. It is connected to what
begins as a single fill line. Downstream, however, this single line
divides into two lines, one line dedicated to each passenger oxygen
cylinder. The associated direct reading pressure gauge allows the
passenger oxygen system pressure to be checked at the servicing
panel. The gauge line is constructed in the same manner as the fill
line, i.e., a single line at the gauge dividing into two lines, one line
dedicated to each passenger oxygen cylinder.
The crew oxygen system filler valve, with chain and cap, is
connected via a single fill line to the crew oxygen cylinder regulator
and provides a point for servicing the system. The associated direct
reading pressure gauge allows the crew oxygen system pressure to
be checked at the servicing panel.
C. Oxygen System Control Panel:
(See Figure 6.)
(1) Airplanes SN 1000 through 1289:
The crew oxygen system control panel is located on the pilot’s skirt
panel. It contains an ON/OFF toggle valve switch that controls
oxygen flow to the three crew mask/regulator assemblies. The
control panel also contains a pressure gauge that displays crew
oxygen system pressure on the oxygen gauge line. Lighting for the
control panel is supplied by the cockpit lighting system.
　
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