Which of the following is not required during a pre-trip inspection?

During a pre-trip inspection for a Pupil Activity Bus, the focus is on several critical components that ensure the safety and operability of the vehicle. This includes checking the braking system, tires, and mirrors, as these elements directly impact safety and visibility while driving.

The engine compartment is not typically included in the mandatory pre-trip inspection process, as it is not directly related to the immediate safety of the bus while it is on the road. While it may be important to regularly check the engine compartment for overall maintenance and any potential issues that could arise, it does not fall under the crucial checks required specifically during a pre-trip inspection for the SPAB. Thus, the correct answer indicates that the engine compartment does not have to be inspected as part of the standard pre-trip protocol, unlike the brakes, tires, and mirrors, all of which are essential for driving safety and compliance.