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control lever (left hand door, MXP 100 only).
(5) Observe that the flow indicator (blinker) momentarily displays a
yellow cross (+), then returns to black. This indicates the regulator is
leak-tight. If the blinker continuously displays the yellow cross, a
leak in the system should be assumed and investigated.
(6) While holding the MXP 100 RESET TEST control lever aft (or MXP
300 PRESS TO TEST AND RESET control lever depressed),
depress and hold the red PRESS TO TEST button on the mask
regulator.
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(a) Observe that the blinker momentarily displays a yellow cross,
then returns to black. This indicates the regulator demand
mechanism is working properly.
(b) If a headset is being worn while performing this test, mask
microphone operation can be checked by listening for oxygen
flow noise.
(7) Release the PRESS TO TEST button on the mask regulator.
(8) Release the MXP 100 RESET TEST control lever (or MXP 300
PRESS TO TEST AND RESET control lever).
(a) Observe the white band (top of RESET TEST control lever,
left hand door, MXP 100 only) is no longer visible.
(b) Observe that oxygen flow ceases.
(9) Select the crew oxygen system toggle valve switch to OFF, if
desired.
C. Average Time of Useful Consciousness:
• 15,000 to 18,000 feet = 30 minutes or more
• 22,000 feet = 5 to 10 minutes
• 25,000 feet = 3 to 5 minutes
• 28,000 feet = 2½ to 3 minutes
• 30,000 feet = 1 to 2 minutes
• 35,000 feet = 30 to 60 seconds
• 40,000 feet = 15 to 20 seconds
• 45,000 feet = 9 to 15 seconds
• 51,000 feet = less than 9 seconds
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Crew Oxygen System Simplified Block Diagram: Airplanes SN 1000 Through 1289
Figure 1
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Crew and Passenger
Oxygen System Simplified
Block Diagram: Airplanes
SN 1290 and Subsequent
Figure 2
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Overboard Discharge Indicator
Figure 3
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Oxygen Servicing Panel: Airplanes SN 1000 Through 1289
Figure 4
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Oxygen Servicing Panel: Airplanes SN 1290 and Subsequent
Figure 5
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Oxygen System Control Panels
Figure 6
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Passenger Oxygen Control Panel
Figure 7
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EROS MXP 300 Crew Mask/Regulator Assembly
Figure 8
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Oxygen Duration Versus Cabin Altitude
Figure 9
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PNEUMATICS
2A-36-10: General
The purpose of the pneumatics system is to provide a common manifold, known as the
bleed air manifold, with hot compressed air for use by other systems. Therefore, this
section describes the sources of air for the bleed air manifold, their controls and the
indications they provide to the flight crew. The airplane systems which use air from the
bleed air manifold are described in the appropriate sections of this chapter.
The pneumatics system uses the following types of bleed air:
• Low pressure (LP) bleed air from the engines
• High pressure (HP) bleed air from the engines
• Bleed air from the single compressor stage of the Auxiliary Power Unit (APU)
• External air from a comparable bleed air source (external pneumatic rig)
The pneumatics system consists of two identical and independent systems that provide
a temperature controlled, pressure regulated air supply for the various using systems,
such as air conditioning, wing and nose cowl anti-icing, cabin pressure, engine starting
　
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