Weight Engineering, also known as Mass Properties Engineering or Weight & Balance (W&B) refers to the prediction, determination, management and tracking of the weight, center of gravity, moments and products of inertia for a new product. These critical factors are important for determining the product’s performance and capabilities. In this context, the W&B division of Capgemini Engineering on behalf of Airbus Helicopters works, among other tasks, on the follow-up of the official helicopter weighings before the delivery of each machine to the customer. Following failure to update the mass databases of the optionals (shopping list of customisations on the machine) installed on the helicopters in recent years, this has led to a progressive deterioration in the accuracy of the data in possession and to the divergence of the difference between the calculated and weighed masses during official weighings.