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Valve status is indicated by the switch/light OPEN annunciation.
Engine 10th-Stage Bleed Air Valves
The 10th-stage bleed air valves are located in the aft equipment bay, and control the supply of
10th-stage bleed air to the engines for starting, and from the engines for bleed air supply.
10th-stage bleed air valve operation is similar to the isolation valve. The valves are manually
commanded open or closed by the L (R) 10TH STAGE switch/lights, located on the BLEED AIR
panel. The valves may also be automatically commanded open or closed by the following
conditions:
• Open – during engine starts (starter engagement).
• Closed – when the associated ENG FIRE PUSH switch/light is pressed.
• Closed – when a pack overpressure occurs.
Valve status is indicated by the respective switch/light CLOSED annunciation (see
Figure 18−10−2). Bleed air temperatures and pressures from the engine compressor
10th-stage are unregulated, and therefore dependent on engine power settings. Temperatures
and pressures can reach 700°F (370°C) and 170 psi (1172 kPa) at full thrust.
APU Load Control Valve (LCV)
The APU load control valve (LCV) controls APU bleed air supply to the 10th-stage manifold. The
LCV is an electrically controlled, pneumatically operated valve which either fully opens or
closes.
The valve is manually controlled by the APU LCV switch/light, located on the BLEED AIR panel.
When the APU LCV switch/light is pressed, the valve opens, which allows APU bleed air to
enter the left bleed air manifold. The APU LCV is automatically commanded closed by the
following conditions:
• Excessive APU EGT.
• APU LCV interlock protection.
Valve status is indicated by the switch/light OPEN annunciation (see Figure 18−10−2). APU
bleed air temperature and pressure can reach 500°F (260°C) and 50 psi (345 kPa).
PNEUMATIC SYSTEM
Description
Vol. 2 18−10−3
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
10TH-STAGE BLEED AIR (CONT'D)
APU Load Control Valve Interlock Protection
A check valve, installed in the APU bleed air duct, prevents manifold pressure from entering
the APU compressor. The APU LCV interlock provides a second level of protection, preventing
manifold pressure from entering the APU by interlocking the APU LCV with the 10th-stage
bleed air switches.
The APU electronic control unit (ECU) monitors the switch positions of the APU LCV,
10th-stage isolation valve, and left and right 10th-stage bleed switches. These four switches
are designed to automatically close, or prevent the opening of, the APU load control valve
whenever the following switch conditions exists:
• L 10th-stage bleed switch/light is selected open; or
• Both R 10th-stage bleed switch/light and the ISOL switch/light are selected open.
External Ground Air Connector
An external ground air connector is located on the aft fuselage, below the left engine. Ground air
may be supplied to the left manifold of the 10th-stage bleed air system when a ground air
source is attached to the external ground air connector.
14TH-STAGE BLEED AIR
Description
The bleed air for the 14th-stage manifold is taken from a single port on each engine compressor’s
14th stage. The air is distributed through the 14th-stage bleed air manifold.
The 14th-stage bleed air is used for:
• Wing anti-ice;
• Cowl anti-ice; and
• Thrust reversers.
PNEUMATIC SYSTEM
Description
Vol. 2 18−10−4
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
14TH-STAGE BLEED AIR (CONT'D)
14th-Stage Bleed Air Schematic
Figure 18−10−3
Components and Operation
14th-Stage Bleed Air Manifold
The 14th-stage bleed air manifold is located in the aft equipment bay. The left engine
pressurizes the left manifold, and the right engine pressurizes the right manifold. 14th-stage
bleed air can only be supplied by an operating engine. Manifold check valves are installed to
prevent reverse flow of 14th-stage air to an operating engine.
14th-Stage Isolation Valve
The isolation valve is located in the aft equipment bay, and separates the left and right wing
anti-ice crossover duct. Refer to Chapter 14, Ice and Rain Protection, for a detailed description.
PNEUMATIC SYSTEM
Description
Vol. 2 18−10−5
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
14TH-STAGE BLEED AIR (CONT'D)
Engine 14th-Stage Bleed Air Valves
The 14th-stage bleed air valves are located in the aft equipment bay, and control the supply of
　
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