Final answer:
The MLG WOW sensors are designed to prevent gear retraction on the ground and to provide ground and air status for other aircraft systems, which makes option d) both b and c the correct answer.
Step-by-step explanation:
The purpose of the Main Landing Gear (MLG) weight-on-wheels (WOW) sensors is to prevent gear retraction on the ground and to provide ground and air status for other aircraft systems via the Proximity Sensor Electronics Unit (PSEU). Therefore, the correct answer is d) Both b and c. These sensors play a critical role in aircraft safety and operation. When an aircraft is on the ground, the WOW sensors ensure that the landing gear remains extended by preventing it from accidentally retracting. They also signal the aircraft's systems about the ground or air status, which may influence various operations, such as enabling or disabling certain functionalities of the aircraft that are only meant for ground operations or for flight, respectively.