Mesa Airlines E-JET Systems Study Guide All Questions (Spring 2023) Already Passed

Mesa Airlines E-JET Systems Study Guide All Questions (Spring 2023) Already Passed How many networks make up the electrical system on the airplane? Why? 2 independent networks Redundancy and fault isolation What happens if a power generating source fails? Bus ties automatically connect to provide no system degradation What components power the AC system? 2 Integrated Drive Generators (IDG) Auxiliary Power Unit (APU) Inverter Ram Air Turbine (RAT) AC GPU receptacle What components power the DC system? 2 NiCad batteries 3 Transformer Rectifier Units (TRU) DC GPU receptacle How does the IDG maintain a stable power output? A Constant Speed Drive (CSD) attaches the IDG to the AGB (Accessory Gear Box) What monitors and controls the IDG's? Each has a Generator Control Unit (GCU) Can one IDG supply the entire electrical system? Yes What will cause the amber IDG light on the overhead panel to illuminate? High oil temperature Low oil pressure If an IDG is manually disconnected can it be reconnected by the flight crew? No. This is a maintenance function What is the primary purpose the AC generators? To power the AC BUSES and AC ESS BUS which... Power the 3 Transformer Rectifier Units (TRU) 1, 2, and AC STBY BUS What is the purpose of the Transformer Rectifier Units? To convert 115 VAC to 28 VDC Can the APU replace a failed IDG? Yes What is the AC electrical system's priority? Onside (IDG) Inside (APU) Outside (GPU) Cross-Side (Other IDG) How is it known that an AC GPU is hooked up to the airplane and ready to provide electricity? GPU button displays AVAIL and the GPU icon is presented on the electrical synoptic page Once the GPU button is pushed in, the button will display IN USE provided another AC power source is not available. What does it mean if the AC GPU is plugged in and the outside GPU panel button displays IN USE? Ground service bus is in use Cockpit GPU button will display AVAIL even though the ground service bus is in use If the airplane is using the AC GPU and the APU is started what should the pilot be sure