Which of the following subsystems is NOT included in the L2A?

The correct choice indicates that the fuel injector is not included in the L2A subsystem of the Cessna 172. The L2A refers to the various systems related to the engine and its performance, including components that are crucial for starting the engine, maintaining ignition, and ensuring proper lubrication.

The starter is a vital component for initiating the engine’s operation, and the ignition system is necessary for creating the spark required for combustion. The oil filter is part of the lubrication system, which is crucial for maintaining engine health by removing impurities from the oil.

In contrast, the fuel injector falls under the fuel delivery subsystem, which is not part of the L2A specifically. It is responsible for delivering the correct amount of fuel into the combustion chamber, but does not pertain to the starting or ignition processes covered by the L2A. Recognizing the specific functions and classifications of various engine components helps in understanding how these systems work in conjunction with each other in the Cessna 172.