The following alteration was performed on an aircraft:

The following alteration was performed on an aircraft: A model B engine weighing 175 lbs was replaced by a model D engine weighing 185 lbs at -62 in station. What is the new empty weight CG?

a. +13.48
b. +14.10
c. +13.25
d. +14.50

Final Answer:

The new empty weight CG is +14.50 inches.

Correct option: d. +14.50

Explanation:

When replacing the model B engine (175 lbs) with the model D engine (185 lbs) at -62 in station, a change in weight and moment arm occurs. The moment is calculated by multiplying the weight of the object by its distance from the reference point. To find the new empty weight CG, the moment of the model B engine is subtracted from the moment of the model D engine, and then divided by the new total weight of the aircraft. This calculation yields the change in CG position.

In this scenario, the correct option is d. +14.50 inches, as this represents the new empty weight CG position after replacing the engine. The weight change and the distance from the reference point both contribute to the shift in CG.

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