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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
Air diverted into the aircraft bleed manifold is no longer available to drive the turbine or cool the combustion system. The loss of pneumatic energy is replaced with thermal energy (fuel) with significant temperature increase. The following variables influence exhaust gas temperature (EGT) under bleed air load conditions: -Aircraft demand for bleed air -Ambient air temperature and density Should EGT reach the limit, the ECU will reduce bleed air flow by modulating the bleed valve toward the closed position to prevent over temperature. BLEED VALVE The APU bleed valve controls airflow to the aircraft bleed system and protects the APU from an overtemperature condition. The valve is controlled electrically and the valve mechanism operates a butterfly valve pneumatically. When the bleed VALVE is open, the ECU adjusts the butterfly plate position to supply the correct quantity of bleed air. These adjustments are related to the required quantity of bleed air and APU EGT. SURGE CONTROL VALVE The surge control valve is automatically controlled by the ECU. The surge valve is commanded open when the APU is supplying electrical loads at flight altitudes above 15 000 ft. This function reduces APU surge potential when operating in an unloaded condition. BLEED AIR AVAILABILITY For the ECU to energize the bleed-air supply system, the APU must be more than 95% of its maximum speed. BLEED AIR LIMITATIONS Refer to the Approved Airplane Flight Manual for bleed air limitations. Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1 05-01-08 CONTROL AND INDICATIONS DESCRIPTION
Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1 The APU generator can be controlled by switches located on the ELECTRICAL control panel. Shown with optional Hydraulic Motor Generator (HMDG) system. May 06/2005 Flight Crew Operating Manual Volume 2 REV 2 CSP 100-6 |
