Mesa Airlines E175 Engine question n answers graded A+ 2023/2024

Mesa Airlines E175 EngineWhat type of engines are on the E-175? - correct answer 2 GE CF34-8E Engines General description of the engine - correct answer High by-pass 2 spool, axial flow, turbofan engine What modules is the engine divided into? - correct answer Cold section, accessory gear box, combustion liner, stage 1 nozzle assembly, HP turbine, LP turbine What are the main components of N1? - correct answer 1 Single-stage LP fan driven by the 4 stage LP turbine What are the main components of N2? - correct answer 10 stage axial flow compressor with variable geometry inlet guide vanes and stator stages driven by the 2 stage HP turbine What are the two sub-systems of the engine fuel system? - correct answer Fuel control system and fuel distribution system What are the components of the fuel control system? - correct answer A 2 channel FADEC, FMU, PMA, engine sensors, VG actuators and Operability Bleed Valve (OBV) What are the components of the fuel distribution system? - correct answer Fuel pump, fuel filter, fuel manifold and 18 fuel injectors Describe the journey of the fuel from the fuel tanks to the combustor - correct answer Fuel from the tanks enters the engine at the fuel pump inlet. From the fuel boost pump, the fuel splits inside the pump housing and is either directed to the FMU or returned to the aircraft as motive flow for the tank ejectors. The fuel that is discharged from the fuel pump is directed to the fuel/oil heat exchanger. From there is enters the fuel filter, contained in the FMU. then the fuel is returned back to the pump to increase the pressure before entering the FMU. The FMU then meters the fuel by means of FADEC inputs and sends this fuel by way of the fuel manifold to the 18 injectors mounted in the combustor frame. Purpose of the engine oil system? - correct answer Provide lubrication, cooling, and cleaning to the turbine engine main shaft bearings and AGB bearings Main components of the engine lubrication system? - correct answer Oil reservoir, lube scavenge pump and oil filtration module (which includes a filter by-pass valve and the fuel/oil heat exchanger How many igniters per engine? - correct answer 2 How many igniters activate for engine start on the ground? In flight? - correct answer 1 on the ground, 2 in flight (switch in AUTO) What happens when the ignition switch is selected to OVRD? - correct answer Activates both igniters Can the igniters be turned off in flight? - correct answer No. Moving the switch to OFF will be ignored by the FADEC. The OFF position is used for dry motoring on the ground What controls the engine? - correct answer A 2 channel FADEC, one channel being active and the other on standby as a backup What is the TLA for IDLE THRUST? - correct answer 22 Is only one FADEC channel used on every flight? - correct answer No. They automatically alternate with each engine start What does the cyan line on the N1 gauge represent during approach? When does it appear? - correct answer The minimum N1 for bleed requirements in icing conditions. It appears when configured for landing 1200ft RA and anti-ice is ON What sources are available for engine starting? - correct answer APU, Ground source, Opposite engine and Windmilling start