Goals and Objectives,Knowledge of fuel system components FAR 121 Fuel Regulations Knowledge of CRJ Fuel System Components, Controls, and Indications,121 FUEL FARS,121.639 Supply, All Domestic - dispatched, alternate, 45 min 121.641 Nonturbine, Flag - dispatched, alternate, 30 min + 15% cruise or 90 min 121.643 Nonturbine, Supplemental - released, alternate, 45 min 121.645 Turbines, Flag and Supplemental - released, 10%, alternate, 30 min holding speed 121.647 Factors - wind & forecasted conditions / traffic / approach / delay landing,Combustion,Newtons Law Command of Power Gas Turbine Fuels - liquid hydrocarbons - JET A/A-1/B Additives,Basic Components,Fuel Tanks Fuel Lines Fuel Valves - Motor - Solenoid Collector Tank Fuel Pumps - Engine - Boost - Ejectors,CRJ FUEL SYSTEM,Fun Times.,14,518 lbs Useable Fuel (Approx 5 Hr FOB) Jet A (Primary) Mixing Okay No Additives,Wing Tanks,Center Tank,Collector Tanks,WET WING 5 TANKS: 1 Center tank 2 Wing tanks 2 Collector Tanks,FUEL TANK CONFIGURATION,Fuel System also consists of-,One way flow valves Attached to the ribs Prevents outward flow of fuel NACA Vent system Low drag vents provide slight positive pressure and pressure release Located on the bottom trailing edge of the wing Climb vent,Magnastick,Water Drain,Naca Vent,MAGNETIC LEVEL INDICATORS,5 TOTAL GAL OR LITERS CORRECTIONS BASED ON INCLINOMETERS,MLIS (Also called Magnasticks),INCLINOMETERS,Fuel System Capacity,Wing tanks 4760 lb. - Pressure refuel (x 2 = 9520) 4488 lb. - Gravity refuel Center tank 4998 lb. - Pressure refuel 4930 lb. - Gravity refuel Total 14518 lb. - Pressure refuel 13906 lb. - Gravity refuel,612# difference,Determining Fuel Quantity,Fuel System Computer Uses signals from capacitance probes corrected for aircraft attitude. Manual mode MLIs on the bottom of the wing. Level Indicator on flight deck wall. Correction table on refueling door.,CAPACITANCE PROBES 15 Total plus 2 Compensators,Fuel Indication,Indication turns Amber when Less than 900 lbs. total or imbalance between wing tanks exceeds 400 lbs.,EICAS PRIMARY,EICAS FUEL SYSTEM PAGE,SINGLE POINT REFUELING RIGHT FORWARD WING ROOT,Over-wing cap,REFUEL/DEFUEL CONTROL PANEL,No Flight Deck Switches Required BITE Check prevents over-fill Pre-select desired fuel,Fuel Transfer,How does the fuel get from the Center tank to the engines. Center tank to Wing Tank Transfer ejectors Wing Tanks to Collector Tanks Scavenge ejectors Gravity Collector tanks to Engine Fuel Pump Main ejectors Electric Boost pumps,FUEL TRANSFER,TO ENGINE,Center Tank to Wing Tanks to Collector Tanks to Engines,FUEL TRANSFER,TO ENGINE,XFER EJECTORS,SCAVENGE EJECTORS,MAIN EJECTORS,ELEC BOOST PUMPS,FUEL SYSTEM,How do the Ejector Pumps work?,Ejectors and Motive flow,Transfer ejectors Center tank to wings Scavenge ejectors Wings to collector Main ejectors Collector to engine All use motive flow from the engine driven pumps. DC boost pump backs up the main ejectors to supply the engine with fuel in case of a main ejector failure.,Fuel Transfer,Happens automatically Fuel from the center tank transfers to the wing tanks when they fall below 94% full Computer opens the motive flow valves and the ejector pumps move the fuel,FUEL CONTROL PANEL,FUEL CONTROL PANEL,INOP Lights indicate switchlights have not been armed, or the Boost Pumps are INOP or producing low pressure,FUEL CONTROL PANEL,ON indicates less than 9 psi from Main Ejector and both BOOST PUMPS are operating.,ON,ON,FUEL CONTROL PANEL,Lights Out is Normal Indication with engines running. Means pumps are ARMED but not operating.,Fuel Cross Flow,Controls the fuel balance between wings Caution message appears on the EICAS when fuel imbalance exceeds 400 lbs 3 ways Auto mode When 200 lbs or more imbalance occurs the computer starts auto crossflow Manual mode When Auto mode inop Gravity Crossflow Fuel flows from one wing to the other by gravity,Fuel Crossflow,X-FLOW,Manual Fuel Transfer,OPEN,PUMP,VALVE,Gravity Fuel Transfer,FUEL SYSTEM SUMMARY,Fully automatic (w/manual backup) Fuel displays color coded EICAS messages alert pilots to malfunctions,Review time,What is the purpose of the collector tanks? How does fuel get to the engine during start? What is the maximum fuel imbalance?,