Need help with my writing homework on Aircraft Fuel System. Write a 3000 word paper answering; The system adds considerable wiring to the system since it needs a separate power supply for backup the alternator. Due to the extra weight of parts of the full authority digital engine control, the balance, and valerate value have to be checked and recalculated. There are additional cockpit controls and switches to control the fuel pump with FADEC power supply, protecting them (BTEC Unit 81 handout). The ECU uses a 3D memory map in controlling the injection of appropriate fuel amount, taking into consideration varied ambient circumstances, such as air pressure density and the air temperature, throttle settings, and RPM. The ECU can sense barometric pressure and, in response, compensates for the appropriate fuel amount to be injected. The spark plug ignition timing is regulated depending on throttle settings for each load. The variations in ignition timing yield faster engine start-up and smooth operations with the variable loads. The FADEC engine does not require choking during engine start since the ECU regulates fall fuel cylinders and helps in retarding the ignition. FADEC system replaces the carburetor. In this case, the ignition does not wholly depend on the aircraft’s electrical system. It combines well with the design of fuel injection (Federal Aviation Administration).
On the other hand, the hydro-mechanical control system makes the driver control the power plant of the aircraft by utilizing an internal combustion engine. The sets of sensors and control are the alternator master and the battery master. The battery master activates the battery contractor that links the battery to the electrical bus aircraft. In contrast, the master alternator supplies power to the alternator’s field circuit to start it (BTEC Unit 81 handout). The two switches are the source of energy to the aircraft systems. The throttle sets up the power level required and controls the massive airflow rate in the carbureted engines that are to be delivered to the cylinder. Pitch control makes adjustments to the speed unit, which, in effect, adjusts the pitch of the propeller and works to control the load required by the engine for maintaining the RPM.