To restrain an 8,000 lb. vehicle in the forward direction, how many MB-1s are necessary?

To determine the number of MB-1 devices needed to restrain an 8,000 lb vehicle in the forward direction, it's essential to understand the restraining capability of a single MB-1 device. Each MB-1 is designed to restrain a specific amount of weight under dynamic conditions, which typically includes the forces experienced during transport.

The correct choice indicates that four MB-1s are necessary for this task. This is based on the formula used for calculating restraint needs. Generally, the standard requirement is that each MB-1 can effectively secure a vehicle weighing up to approximately 2,000 lbs. Therefore, to restrain an 8,000 lb vehicle, you would divide the total weight of the vehicle by the restraining capacity of one MB-1.

Thus, the calculation would be:

8,000 lbs / 2,000 lbs per MB-1 = 4 MB-1s.

This ensures that the vehicle is properly secured and minimizes the risk of movement during transport. Employing four MB-1s provides the necessary safety and compliance with Air Force transport regulations.