Final answer:
The question revolves around aircraft spoilers and their functions. In aviation, spoilers are used to decrease lift, with ground spoilers aiding in slowing the aircraft on landing, and multi-function spoilers contributing to roll control, acting as speedbrakes, and serving as ground spoilers.
Step-by-step explanation:
Understanding Aircraft Spoilers
The question pertains to the functionality of aircraft spoilers, which are vital components in the flight controls of an airplane. In aviation, spoilers are used to disrupt the airflow over the wings and reduce lift. The specific spoilers mentioned in the question (L/R 1-2 [IB] and L/R 3-5 [OB]) are identified as ground spoilers and multi-function spoilers respectively. Ground spoilers, which are usually found inboard on the wings (IB), are activated on the ground to help slow down the aircraft upon landing. Multi-function spoilers, generally located outboard on the wing (OB), have three main functions: they assist with roll control during flight by differential deployment, act as speedbrakes to reduce the speed in the air, and serve as ground spoilers upon touchdown.