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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 18.10.3
Oct 05/06
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 SUMMARY 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:
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Open – during engine starts (starter engagement).
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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:
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Open – during engine starts (starter engagement).
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Closed – when the associated ENG FIRE PUSH switch/light is pressed.
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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.
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本文链接地址：庞巴迪挑战者605公务机机组操作手册 CL605-CHAPTER 18 -空气 PNEUMATIC(2)
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