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ENGINE BLEED AIR PRESSURE REGULATION Engine air pressure increases proportionally with N2 compressor speed. The IPV limits the intermediate engine bleed pres-sure to 50 ± 3 psi. If a valve fails and manifold pressure exceeds 60 psi, a L (R) BLEED FAIL (C) CAS message is dis-played. APU/ENGINE BLEED SWITCHING All bleed switching is done manually by the aircrew. ENGINE START SEQUENCES During engine starts on the ground, provided a bleed source has been selected, engaging the engine start switch will auto-matically sequence the valves to isolate the air conditioning system and allow bleed air to flow to the air turbine starters. When the L (R) STARTER switch is positioned to START, the following occurs: -Cross bleed valve opens (if previously closed) -Flow control valves close (if previously open) -Associated start valve opens -Engine air turbine starter (ATS) engages When the engine achieves a self-sustaining rpm, the ATS disengages, the start valve closes, and the flow control and cross bleed valves return to the previous position. Cross-engine bleed air (from one engine to the other) can be used to power the starter. Interstage bleed air, taken from the selected engine is used for cross-engine bleed starting. APU/ENGINE BLEED SWITCHING SEQUENCE Takeoffs and landings are normally done with APU bleed air switch On and engine bleed air switch Off. During climb, the pilot switches the XBLEED CLOSED, L BLEED On, APU bleed Off, R BLEED On and the APU OFF. During approach, the pilot starts the APU and switches the R BLEED switch OFF, APU BLEED ON, L BLEED switch OFF, and the XBLEED switch OPEN. APU BLEED VALVE OPERATION Bleed air from the APU can be used for engine starting and air conditioning. The APU electronic control unit (ECU) con-trols the bleed valve and energizes the bleed air supply system and supplies compressed air from the APU power section to the applicable aircraft system through the bleed air duct. The load control valve is connected to the compressor outlet of the APU. When the load control valve is open, the ECU adjusts the butterfly plate position to supply the correct quantity of bleed air. These adjustments are controlled by the required quantity of the bleed air load and the APU exhaust gas temperature. Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6 02-02-05 BLEED AIR LEAK DETECTION SYSTEM DESCRIPTION COMPONENTS AND OPERATION SINGLE LOOPS 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300公务机机组操作手册 Bombardier Challenger-空调和增压 Air Cond and Press(6) |
