|
曝光台 注意防骗 网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者
PNEUMATIC SYSTEM Description Vol. 2 18.10.6
Oct 05/06
Engine 14th-Stage Bleed Air Valves
The 14th-stage bleed air valves are located in the aft equipment bay, and control the supply of 14th-stage bleed air from the engines to the manifold. The 14th-stage valves are electrically controlled, pneumatically operated valves, which either fully open or fully close. The bleed air valves are spring-loaded open when no 14th-stage bleed air is available, or when electrical control power is lost.
The valves are manually commanded open or closed by the L (R) 14TH STAGE switch/lights, located on the BLEED AIR panel. The valves are automatically commanded closed when the associated ENG FIRE PUSH switch/light is pressed. However, when bleed air is no longer available after engine N2 spools down, the valve will reopen regardless of the ENG FIRE PUSH
switch/light position.
Valve status is indicated by the respective switch/light CLOSED annunciation (see Figure 18.10.3).
Bleed air temperatures and pressures from the engine compressor 14th-stage are unregulated, and therefore dependent on engine power settings. Temperatures and pressures can reach 950°F (510°C) and 215 psi (1482 kPa) at full thrust.
BLEED AIR LEAK DETECTION SYSTEM
Description
The bleed air leak detection system monitors the pneumatic ducting downstream of the 10th-stage and 14th-stage bleed air shutoff valves and wing anti-ice valves, along the fuselage, pylon and wing areas.
Bleed air leaks that occur between the engine and the engine bleed air shutoff valves are detected by the engine and jet pipe/pylon overheat detection system. Refer to Chapter 9, Fire Protection.
To detect bleed air leaks, the 10th-stage and 14th-stage bleed air leak detection system uses sensing elements (loops) for bleed air ducting in the aft equipment bay, the portion of the cowl anti-ice ducting which passes through the engine pylon, and for the wing anti-ice ducting passing through the fuselage.
Thermal switches detect bleed air leaks in the leading edge portion of the wing anti-ice ducting.
PNEUMATIC SYSTEM Description Vol. 2 18.10.7
Oct 05/06
Bleed Air Leak Detection Sensing Elements and Thermal Switches
Figure 18.10.4
Components and Operation
Bleed Leak Detection
The bleed air ducts are constructed of stainless steel, insulated, and encased by a protective outer cover. A series of holes are drilled at designated locations in the outer cover, and sensing elements are installed adjacent to these holes. If a bleed air duct leak develops, these holes direct the escaping hot air toward the leak detection sensing elements.
Sensing Elements
The bleed air leak detection sensing elements operate in a similar manner to the sensing elements used in the engine fire detection system.
The 10th-stage manifold uses a dual-loop sensing system. On a dual-loop system, both loops must detect a leak before a duct overheat warning is given.
中国公务机网 www.gongwuji.com
公务机翻译 www.aviation.cn
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(4)
| 
