航空喷气式飞机CRJ200燃油系统PUC英文培训课件.ppt

1、,Fuel System,Recurrent Ground School 9/30/2005,Maximum permissible fuel imbalance 800 lbs between wing tanks Takeoff in excess of _ in center tank is not permissible unless _. 500 lbs unless the wing tanks are above 4400 lbs Minimum fuel for go-around 450 lbs per wing (max 10 degrees pitch up),Limit

2、ations,Takeoff with the engine fuel temperature below _ C is prohibited. 5C _ and _ crossflow must be off for takeoff. Powered and Gravity,Limitations,Fueling Pressure Refueling Single Point fueling Gravity Refueling Through wing ports EICAS Fuel information located on these pages: Primary Status Fu

3、el Synoptic,Overview,Fuel distributed to the engines and APU Fuel System Computer Monitors and controls operations of the fuel system Calculates fuel quantity Control operations of valves and pumps,Components and Operations,Fuel is distributed though a combination of motive flow and gravity Scavenge

4、 Ejectors Transfer fuel from the wing to collector tanks Main Ejectors Deliver fuel from the collector tank to the engine Transfer Ejectors Transfer fuel from the center to wing tanks Engines must be running for fuel transfer to take place,Components and Operations,Motive flow is fuel circulating th

5、rough the system Created by return fuel from the Engine Driven Fuel Pump Motive flow must be present for the ejector pumps to work Ejectors are simply venturis that send pressurized fuel forward.,Motive Flow,Motive Flow,Fuel enters the back of the pump as motive flow Motive flow created by the engin

6、e driven fuel pumps The venturi created within the pump sucks fuel from the fuel tank below Pressurized fuel is then sent forward and is highly pressurized,Description Fuel transfer system moves fuel from the center to the wing tanks for CG control Fuel is only carried in the center tank for extende

7、d ranges Process is entirely automated Will occur when the wing tank drops to 94% of total capacity (4400 lbs) No EICAS messages when fuel is transferred,Fuel Transfer,Components and Operations,FUEL,TOTAL FUEL,10000 LBS,FUEL USED,3900 LBS,1000 LBS,P,55 c,APU,55 c,4500 LBS,4500 LBS,-25 c,P,P,TRANSFER

8、 EJECTORS,SCAVENGER EJECTORS,MAIN EJECTORS,Collector tanks Located forward section of main tanks All fuel to the engine passes through here Their purpose is to make sure that the engines have a constant fuel supply Fuel enters the collector tanks primarily via gravity tanks The scavenge ejectors pic

9、k up fuel from the lowest part of the wing tanks,Components and Operations,Engine Fuel SOV Located in main landing gear bay Controlled by ENG FIRE PUSH button Electrically operated APU Fuel SOV Located on center wing box in main landing gear bay APU FIRE PUSH / PWR FUEL Electronically operated,Compo

10、nents and Operations,Boost Pumps Electric pumps to move fuel from collector tanks to the engines Backup main ejectors during start or if ejectors fail When selected, the pumps are armed to detect a low pressure condition on their respective side ONLY! If either boost pump detects low pressure on the

11、ir side, BOTH fuel pumps will turn on,Components and Operations,XFLOW/APU PUMP System crossflow and APU Fuel Fuel taken equally from both wing tanks Located in aft bulkhead on main landing gear bay,Components and Operations,Fuel XFLOW Valves Allow fuel to be transferred between wing tanks Manual or

12、automatic Gravity XFLOW Valves Allows fuel to be transferred between wing tanks Manual only,Components and Operations,Automatic Fuel Transfer Fuel transfer will begin when there is a 200 lb. difference Fuel transfer will end when the original low tanks is 50 lbs. above the other tank Gravity Fuel Tr

13、ansfer Used when powered XFLOW fails. Pressing the switch opens the gravity manifold SOV,Components and Operations,Automatic Powered Crossflow When a fuel imbalance of more than 200 pounds exists between wing tanks FSC starts XFLOW pump Fuel is taken from both wing tanks Associated XFLOW valve opens

14、 to replenish quantity When low tank is 50 lbs more than other tank Pump stops Valve closes,Fuel Crossflow,Fuel Heat Exchanger On engine Fuel/Engine Oil Heat exchanger warms the fuel, cools the engine oil Fuel temperature shows on EICAS Fuel Filter On engine Impending bypass switch, if clogged, send

15、s EICAS message,Components and Operations,Fuel synoptic Total Fuel Quantity Readout Fuel Used readout Center Tank Fuel Quantity Bulk Fuel Temperature Wing tank Fuel Quantity,Components and Operations,Components and Operations,APU Negative-Gravity Relief Valve Allows fuel from right engine manifold t

16、o APU Spring loaded to open when low pressure exists downstream of the valve. Not depicted on synoptic page Will open after XFLOW/APU pump failure or negative gravity in flight,P,Xflow/APU Pump,Right Engine Fuel Feed Manifold,APU Negative Gravity Relief Valve,APU Fuel Feed Shutoff Valve,APU Fuel Fee

17、d Check Valve,How many fuel tanks does the CRJ have? 5 two wing tanks, two collector tanks and a center tank How are the fuel tanks vented? NACA Scoops What components of the fuel system maintains symmetry (crossflow operations) of the wing tanks? APU XFLOW pump, fuel X FLOW valves and Gravity X FLO

18、W valves What electrical system is required for pressure fueling? DC power,Review,What ejectors supply fuel from the center tank to the wing tanks? Transfer ejectors A failure of what components will cause the crew to manually control fuel? XFLOW APU PUMPS and L (R) XFLOW SOV What fuel movement is completely automatic? Fuel transfer T/F the APU negative relief valve will only supply fuel when the APU XFLOW PUMP fails False, also supplies fuel in negative G situation,Review,T/F if the fuel filter becomes clogged in flight the engine will fail False, fuel filter