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17-12 Crew Mask Controls .............................................................................................. 17-8
17-13 Oxygen Bottle ...................................................................................................... 17-10
TABLE
Table Title Page
17-1 Oxygen Supply Duration ..................................................................................... 17-11
510OM-00 17-iii
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17-iv 510OM-00
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INTENTIONALLY LEFT BLANK
GENERAL
The oxygen system includes the crew and passenger
distribution systems (Figure 17-1).
Oxygen is available to the crew at all times and
is available to the passengers either automatically
above a cabin altitude of approximately
14,800 feet, or manually at any altitude by
the oxygen control valve.
The squat switches provide signals to various
aircraft systems, controls and indications to adjust
them for different operation, depending
on whether the aircraft is in flight or on the
ground. The specific role of the squat switch
in each aircraft system is described in detail
in that system chapter of this manual.
510OM-00 17-1
CHAPTER 17
MISCELLANEOUS SYSTEMS
INTRODUCTION
This chapter covers the oxygen system and squat switch (weight-on-wheels sensing) systems
on the Citation Mustang. Oxygen is available to the crew and passengers during
pressurization system malfunctions or when required. One squat switch on each landing
gear indicates when weight is on the wheel. The squat switches provide signals to
various aircraft systems.
CITATION MUSTANG OPERATING MANUAL
17-2 510OM-00
CITATION MUSTANG OPERATING MANUAL
OXYGEN
BOTTLE
LP
RH MULTI-FUNCTION
PCB WITH
TRANSDUCER
LH MULTI-FUNCTION
PCB WITH
TRANSDUCER
PILOT OXYGEN
MASK
COPILOT OXYGEN
MASK
NORMAL
(SOLENOID VALVE
NORMALLY CLOSED)
OXYGEN
CUTOFF VALVE
OXYGEN
BLOWOUT DISC
FILL PORT
LOW OXYGEN
PRESSURE SWITCH
(OXYGEN OFF - CAS
MESSAGE)
OXYGEN CONTROL
VALVE
OXYGEN
SUPPLY
HANDLE
REGULATOR
CHECK
VALVE
CABIN DROP BOX ASSEMBLY
(DOUBLE MASK)
CABIN DROP BOX ASSEMBLY
(SINGLE MASK)
OXYGEN CONTROL
VALVE SELECTOR
CREW ONLY
DROP MASK
BOTTLE PRESSURE
LEGEND
REGULATED CREW OXYGEN
(AVAILABLE TO CREW AT ALL TIMES)
REGULATED PASSENGER OXYGEN
(CONTROLLED BY OXYGEN CONTROL VALVE)
OXYGEN GAUGE
Figure 17-1. Oxygen System Schematic
OXYGEN SYSTEM
DESCRIPTION
The Mustang oxygen system is primarily for
emergency use, but also allows limited-duration
nonemergency use. It provides breathable
low-pressure oxygen (at approximately
70 psi) to crew and passengers through individual
oxygen masks.
The system uses a single bottle of compressed
oxygen to supply both crew masks and passenger
masks. A regulator controls overall system
pressure, and a shutoff valve (controlled by an
oxygen supply valve labeled OXYGEN SUPPLY
in the cockpit) enables or disables the system.
Another cockpit control labeled OXYGEN
CONTROL VALVE selects distribution modes.
An oxygen gauge indicates the pressure (and indirectly,
volume) of oxygen in the bottle. A crew
alerting system (CAS) message indicates when
insufficient oxygen is available. If oxygen supply
is shut off or if pressure in the system is too
low, an amber OXYGEN OFF message appears.
Individual controls on crew masks adjust their
oxygen flow.
COMPONENTS
The system includes:
• Oxygen bottle (with integral shutoff
valve and pressure regulator)
• Oxygen masks (crew and passenger)
• Oxygen control valve
Oxygen Bottle
A single bottle holds all compressed oxygen
for the system. It is on the right side of the nose
storage compartment and has a 623-liter (22-
cubic-feet) useable capacity with 1,133-liter
(40-cubic-feet) option. Oxygen is stored in
the bottle at a pressure between 1,600 and
1,800 psig.
A shutoff valve and pressure regulator on the
bottle control the flow of oxygen to the distribution
system (Figure 17-1). The regulator
reduces oxygen system pressure to 70 psi
downstream of the bottle. The shutoff valve on
the bottle is normally open in flight. It is mechanically
controlled in the cockpit by the
OXYGEN SUPPLY control knob.
Crew Oxygen Masks
Each crewmember is supplied with a quickdonning
mask with a built-in microphone and
　
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