Fault Tree Analysis This problem focuses on the functional success or failure of a simplified airplane consisting of two major independent subsystems: the propulsion subsystem and the electrical-power supply subsystem. In this problem, you are asked to focus on the failure of this airplane, formulate the problem as a fault tree in which the top event is the failure of this airplane and identify all minimum cur-sets for the fault tree. The propulsion subsystem of an airplane has three engines, and they can provide 100 units, 60 units and 60 units of thrust, respectively. Suppose that the airplane needs 150 units of thrust to be considered operational. The airplane uses electrical power to control all the equipment and instruments, except the propulsion subsystem. (Recall the simplifying assumption of independence of the two subsystems.) The electrical-power supply subsystem has built-in redundancy and has two identical modules. As long as one of the two modules works, the subsystem works. Each of the two modules consists of one dedicated battery and the required circuitry. Suppose that each battery has sufficient charge to last the entire flight in absence of its failure, so that the operation of the electrical-power supply subsystem does not need