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10th-Stage Bleed Air Schematic
Figure 18−10−2
Components and Operation
10th-Stage Bleed Air Manifold
The 10th-stage bleed air manifold is located in the aft equipment bay. An isolation valve divides
the 10th stage into the left and right manifolds. With the isolation valve closed, the left manifold
may be pressurized from external air, APU or left engine bleed air. The right engine bleed air
normally pressurizes the right manifold.
One-way check valves are installed on the engine in the 10th-stage bleed ducts. The valves
prevent the reverse flow of manifold air into the engines. Similar valves are also used for the
APU and the external ground air connector.
PNEUMATIC SYSTEM
Description
Vol. 2 18−10−2
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
10TH-STAGE BLEED AIR (CONT'D)
Pressure readings for the manifold are derived from two pressure transducers, one for the left
manifold and one for the right manifold. The pressure readings for the left and right 10th-stage
manifold are displayed on the EICAS Status page.
Isolation Valve
The isolation valve is located in the aft equipment bay and is used to isolate the left and the
right manifold. Opening the isolation valve allows air from any of the sources to be supplied to
the left or right manifold as required. The 10th-stage isolation valve is an electrically controlled,
pneumatically operated valve, which either fully opens or fully closes. The isolation valve is
spring-loaded closed when no 10th-stage bleed air is available or when electrical control power
is lost.
The isolation valve is manually commanded open or closed by the 10TH STAGE ISOL
switch/light located on the BLEED AIR panel. The valve may also be automatically
commanded open or closed by the following conditions:
• Open; during engine starts (starter engagement).
• Closed; when a pack overpressure occurs.
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
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
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 LCV, 10th-stage
isolation valve, and left and right 10th-stage bleed switches. The APU LCV will automatically
close or be prevented from opening whenever the following switch conditions exist:
• L 10th-stage bleed switch/light is pressed open; or
　
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