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القائمة
| هندسة وصيانة الطائرات Engineering & Aircraft Maintenance يختص بشرح منظومات الطائرة والرد على استفسارات مهندسي الطيران. راجع الفهرس من هنا |
| موضوع مغلق |
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أدوات الموضوع |
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| هندسة وصيانة الطائرات Engineering & Aircraft Maintenance يختص بشرح منظومات الطائرة والرد على استفسارات مهندسي الطيران. راجع الفهرس من هنا |
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أدوات الموضوع |
21-04-2008,
04:19 PM
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مشاركة [ 1 ] | ||
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السلام عليكم ورحمة الله وبركاته
اخواني اللي يقدر يساعدني في هذا البحث جزاكم الله خيراً البحث يقول: Investigate the methods used to ensure the continuing integrity and safety of aircraft power supply systems in the event of primary system failure اللي يقصده اذا واحد من المحركات تعطل بالتحديد(hydrolic,electric,pneumatic) اذا واحد منهم تعطل كيف الثاني يقدر يغطي لمواصلة الرحله امنه وياليت بالانجليزي وشكراُ لكم |
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21-04-2008,
11:06 PM
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مشاركة [ 2 ] | |||
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وجدت مجموعة من الروابط أتمنى تجد فيها إجابتك https://www.iflyamerica.org/engine_failure.asp https://www.fromthecockpit.com/Engine_Failure.html https://www.freepatentsonline.com/5363317.html https://www.geocities.com/khlim777_my...nsviaemail.htm https://www.flydamnit.com/2006/06/27/...lure-after-v1/ وبالتوفيق إن شاء الله تحياتي mechanic |
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21-04-2008,
11:40 PM
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مشاركة [ 3 ] | |||
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ELECTRICAL POWER - INTRODUCTION General The electrical power system makes, supplies, and controls electrical power to the airplane. The system has these subsystem:
Abbreviations and Acronyms
AC GENERATION - FUNCTIONAL DESCRIPTION General The BPCU and GCUs automatically control the power source selection for each main ac bus. The power sources for a main ac bus have this priority:
External power has priority over other sources when you manually choose it with the external power switch. APB Control When the APU is running, the APU GCU closes the APB. This permits the APU to supply power to the tie bus. If the left main ac bus has no power, the left GCU closes the left BTB. This connects the tie bus to the left main ac bus. If the right main ac bus has no power, the right GCU closes the right BTB. This connects the tie bus to the right main ac bus. GCB Control When the left IDG operates, the left GCU closes the left GCB. This permits the IDG to supply power to the left main ac bus. When the right IDG operates, the right GCU closes the right GCB. This permits the IDG to supply power to the right main ac bus. BTB Control One IDG can supply power to both main ac buses at the same time. For example, if the right IDG fails, the right GCU opens the right GCB and closes the right BTB. The left GCU closes the left BTB. This connects the left main ac bus to the right main ac bus. Ground Service and Ground Handling Buses When the right main ac bus has power, it supplies power to the ground service bus. When the right main ac bus has no power, the BPCU selects primary external power or the APU generator as the power source. Primary external power or the APU generator also supply power to the ground handling bus through the ground handling relay. If both the APU generator and primary external power are available, primary external power has priority. Backup Generator Power The backup power system supplies power to one or both transfer buses during these conditions:
The backup generator converter controls the TBBs and CCBs. For example, if the left main ac bus has no power, the converter opens the left TBB and closes the left CCB. This permits the converter to supply power to the left transfer bus. BITE The GCUs and backup converter protect and monitor the ac power systems for faults. They perform three kinds of tests:
The GCUs and the converter send the test fault data to the AIMS. Training Information Point There is a short time delay between when the engine reaches idle and when the IDG starts to supply power. The length of the time delay depends on engine idle speed data from the engine data interface unit (EDIU). On the ground, if the GCU gets a satisfactory engine idle speed signal from the EDIU, the IDG starts to supply power in 6 seconds. If there is not a satisfactory engine idle speed signal from the EDIU, the GCU gets a different engine speed signal from its own PMG. In this case, the IDG starts to supply power in 16 seconds. In the air, if the GCU gets a satisfactory engine idle speed signal from the EDIU, the IDG starts to supply power in 10 seconds. If it must get an engine speed signal from the PMG, the IDG starts to supply power in 20 seconds.  DC GENERATION - FUNCTIONAL DESCRIPTION Normal Power The dc generation system normally receives power from these ac power sources:
Four TRUs change the ac power from the transfer buses to dc power. Most of the dc loads on the airplane use this power. The standby ac bus uses power directly from the left transfer bus. Two battery chargers change the ac power from the ground service bus to dc power. This dc power charges the main and APU batteries. It also supplies power to the hot battery bus loads. Three PSAs change the ac power from the backup generator PMGs to dc power. Flight control components use this dc power. Standby Power When all ac power is lost, the main battery supplies power to the standby loads of the dc generation system until the RAT deploys (except those on the first officer's flight instrument bus). The standby loads are on these buses:
After the RAT deploys, its generator supplies all of the power for the standby loads through the two center TRUs. Control The ELMS controls all the dc power system relays. (The RAT GCU can also control the TRU C1 relay.) The battery switch and the standby power switch supply manual control inputs to the ELMS. The ELMS decreases the effect of faults in the dc generation system by normally keeping dc buses isolated. But, if there is a power loss to a dc bus, the ELMS can supply power to that bus from another dc bus. It does this by connecting the two buses. The ELMS uses these relays to connect dc buses:
Fault Isolation - DC/Standby Self-Check The dc subsystem card does a check of the dc system. This is called a dc/standby self-check. It does these tests:
A dc/standby self-check can start either manually or automatically. You manually start the self-check when you set these conditions:
The self-check starts automatically when these conditions occur:
The test takes less than ten seconds. If the system passes the test, no message shows on the EICAS display. If the system fails the test, the advisory message ELEC STANDBY SYS shows.
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22-04-2008,
02:29 AM
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مشاركة [ 4 ] | ||
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وجدت مجموعة من الروابط أتمنى تجد فيها إجابتك وبالتوفيق إن شاء الله تحياتي mechanic
الله يفرج عنك دنيا واخره شكراً على مساعدتك وبارك الله فيك دمت بود |
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22-04-2008,
02:31 AM
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مشاركة [ 5 ] | ||
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ELECTRICAL POWER - INTRODUCTION General The electrical power system makes, supplies, and controls electrical power to the airplane. The system has these subsystem:
Abbreviations and Acronyms
AC GENERATION - FUNCTIONAL DESCRIPTION General The BPCU and GCUs automatically control the power source selection for each main ac bus. The power sources for a main ac bus have this priority:
External power has priority over other sources when you manually choose it with the external power switch. APB ControlWhen the APU is running, the APU GCU closes the APB. This permits the APU to supply power to the tie bus. If the left main ac bus has no power, the left GCU closes the left BTB. This connects the tie bus to the left main ac bus. If the right main ac bus has no power, the right GCU closes the right BTB. This connects the tie bus to the right main ac bus. GCB Control When the left IDG operates, the left GCU closes the left GCB. This permits the IDG to supply power to the left main ac bus. When the right IDG operates, the right GCU closes the right GCB. This permits the IDG to supply power to the right main ac bus. BTB Control One IDG can supply power to both main ac buses at the same time. For example, if the right IDG fails, the right GCU opens the right GCB and closes the right BTB. The left GCU closes the left BTB. This connects the left main ac bus to the right main ac bus. Ground Service and Ground Handling Buses When the right main ac bus has power, it supplies power to the ground service bus. When the right main ac bus has no power, the BPCU selects primary external power or the APU generator as the power source. Primary external power or the APU generator also supply power to the ground handling bus through the ground handling relay. If both the APU generator and primary external power are available, primary external power has priority. Backup Generator Power The backup power system supplies power to one or both transfer buses during these conditions:
The backup generator converter controls the TBBs and CCBs. For example, if the left main ac bus has no power, the converter opens the left TBB and closes the left CCB. This permits the converter to supply power to the left transfer bus. BITEThe GCUs and backup converter protect and monitor the ac power systems for faults. They perform three kinds of tests:
The GCUs and the converter send the test fault data to the AIMS. Training Information PointThere is a short time delay between when the engine reaches idle and when the IDG starts to supply power. The length of the time delay depends on engine idle speed data from the engine data interface unit (EDIU). On the ground, if the GCU gets a satisfactory engine idle speed signal from the EDIU, the IDG starts to supply power in 6 seconds. If there is not a satisfactory engine idle speed signal from the EDIU, the GCU gets a different engine speed signal from its own PMG. In this case, the IDG starts to supply power in 16 seconds. In the air, if the GCU gets a satisfactory engine idle speed signal from the EDIU, the IDG starts to supply power in 10 seconds. If it must get an engine speed signal from the PMG, the IDG starts to supply power in 20 seconds. DC GENERATION - FUNCTIONAL DESCRIPTION Normal Power The dc generation system normally receives power from these ac power sources:
Four TRUs change the ac power from the transfer buses to dc power. Most of the dc loads on the airplane use this power. The standby ac bus uses power directly from the left transfer bus.Two battery chargers change the ac power from the ground service bus to dc power. This dc power charges the main and APU batteries. It also supplies power to the hot battery bus loads. Three PSAs change the ac power from the backup generator PMGs to dc power. Flight control components use this dc power. Standby Power When all ac power is lost, the main battery supplies power to the standby loads of the dc generation system until the RAT deploys (except those on the first officer's flight instrument bus). The standby loads are on these buses:
After the RAT deploys, its generator supplies all of the power for the standby loads through the two center TRUs. ControlThe ELMS controls all the dc power system relays. (The RAT GCU can also control the TRU C1 relay.) The battery switch and the standby power switch supply manual control inputs to the ELMS. The ELMS decreases the effect of faults in the dc generation system by normally keeping dc buses isolated. But, if there is a power loss to a dc bus, the ELMS can supply power to that bus from another dc bus. It does this by connecting the two buses. The ELMS uses these relays to connect dc buses:
Fault Isolation - DC/Standby Self-Check The dc subsystem card does a check of the dc system. This is called a dc/standby self-check. It does these tests:
A dc/standby self-check can start either manually or automatically. You manually start the self-check when you set these conditions:
The self-check starts automatically when these conditions occur:
The test takes less than ten seconds. If the system passes the test, no message shows on the EICAS display. If the system fails the test, the advisory message ELEC STANDBY SYS shows.
بارك الله فيك اخي الكريم وشكراً على مساعدتك الرائعه سيتم ادراج اللازم في بحثي دمت بود |
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22-04-2008,
11:54 AM
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مشاركة [ 6 ] | ||
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يعطيكم العافيه
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26-04-2008,
08:54 PM
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مشاركة [ 7 ] | |||
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الله يعطيكم العافية ياشباب على هذه المعلومات
والله انهااااااااا مفيده جدااااااااااا والله يكثر من امثالكم |
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| موضوع مغلق |
هندسة وصيانة الطائرات Engineering & Aircraft Maintenance
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المواضيع المتشابهه
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| الموضوع | المنتدى | |||
| ارجو المساعدة جزاكم الله خير | أكاديميات ومدارس الطيران Academic School | |||
| ممكن مساعدة جزاكم الله خير اخواني ؟؟!! | الدعم الفني - طلبات واستفسارات  |
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| مساعدة جزاكم الله خيرا في fs2004 | إضافات Flight Simulator 2004 | |||
| ضاروري جدا كل من يعرف عن اكادمية سن رايز يفيدني جزاكم الله خير | أكاديميات ومدارس الطيران Academic School | |||
| مساعده في البروجيكت جزاكم الله خيراً | أكاديميات ومدارس الطيران Academic School | |||
مساعده في بحث جزاكم الله خيراً
اقتباس: 
