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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 18.10.4
Oct 05/06
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 18.10.5
Oct 05/06
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.
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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(3)
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