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ILLUSTRATION
Figure Title Page
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INTRODUCTION
This chapter describes the pneumatic systems on the Citation Mustang aircraft. The pneumatic
systems route air or nitrogen from various sources to aircraft systems that use pneumatics
for heating, cooling, pressurization, landing gear, and brakes. Because each of
the Mustang pneumatic systems is dedicated to a specific purpose, this chapter provides
a brief overview of each system, then refers the reader to the appropriate chapter elsewhere
in this manual.
CHAPTER 9
PNEUMATICS
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GENERAL
The Mustang pneumatic systems are each discrete
systems, dedicated to a specific task,
and isolated from all other pneumatic systems.
The Mustang pneumatic systems (Figure
9-1) include:
• Bleed air from engine compressors (outboard
bleed-air port on each engine) for
pneumatic ice-protection systems
• Bleed air from engine compressors (inboard
bleed-air port on each engine) for
temperature-controlled pressure vessel
air supply
• Compressed nitrogen from the storage
bottle for emergency landing gear extension
(blow-down bottle)
• Compressed nitrogen from the storage
bottle for emergency brakes (emergency
braking bottle)
Each of these systems is independent of the
others and can function when any other pneumatic
system fails. Single-engine operation can
normally maintain all required pneumatic system
functions. However, loss of DC power
can cause complete or partial failure of multiple
systems. Compressed nitrogen pneumatic
systems are not dependent upon engine operation
or DC power.
Safety devices in each pneumatic system prevent
excessive pressure. Each system has its
own controls. All systems are controlled directly
or indirectly by pilot command. Indications
for the compressed nitrogen systems are in the
nose baggage compartment. Indications for all
other pneumatic systems are displayed in the
engine indicating and crew alerting system
(EICAS) in the cockpit displays.
DESCRIPTION
BLEED-AIR DISTRIBUTION
High-temperature engine bleed air is extracted
from the high-pressure compressor section of
each engine and routed through two separate
ports. The outboard port on each engine supplies
bleed air for ice protection. The inboard
port supplies bleed air for the temperature-controlled
pressure vessel air supply.
From separate engine bleed-air ports, the bleed
air enters ducts to the ice protection system and
pressure vessel air supply. Check valves prevent
flow (in any of the ducts) from reversing
and entering an engine, including any
crossover flow from the opposite engine.
Ice Protection
The outboard port supplies bleed air for ice
protection. It supplies hot engine bleed air:
• Directly to the respective engine anti-ice
system
• Through a service air regulator to the aircraft
pneumatic deice boot system
Engine Anti-Ice System
Bleed air for each engine anti-ice system is
routed to the leading edge of the engine inlet
through a valve. The hot bleed air warms the
leading edge as it passes through, then exits
overboard through an opening in the bottom
of the engine nacelle. The engine anti-ice system
is explained in Chapter 10—“Ice and Rain
Protection.”
Surface Deice (and Service Air)
System
Bleed air for the surface deice system is routed
to the service air regulator for operation of
pneumatic deice boots. Refer to Chapter 10—
“Ice and Rain Protection.”
Pressure Vessel Air Supply
Hot, high-pressure bleed air supplies air for
temperature control and pressurization. The
bleed air from the inboard bleed-air port on
each engine is routed through a heat exchanger
in the respective engine pylon. The heat exchanger
dissipates heat from the bleed air to
the metal ducts of the heat exchanger. Cooler
outside ram air from the pylon ram-air inlets
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HOT BLEED AIR
SERVICE AIR TO SURFACE DEICE
COCKPIT/CABIN AIR SUPPLY
EMERGENCY GEAR BLOWDOWN
EMERGENCY BRAKES
LEGEND
Figure 9-1. Mustang Pneumatic Systems
passes over the heat exchanger ducts and carries
　
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