Which tool is NOT recommended for removing rust from aircraft materials?

Sandblasting equipment is not recommended for removing rust from aircraft materials due to the potential for damaging the surface of the materials being treated. While sandblasting can effectively remove rust, the abrasive nature of the process can lead to surface erosion, altering the structural integrity and finishing of the aircraft components. This is especially critical in aerospace applications where the integrity and precision of materials are paramount.

The other tools mentioned, like abrasive papers, small power buffers, and hard wire brushes, are more controlled methods for rust removal that minimize the risk of damage. They allow for targeted rust treatment while being less abrasive on the material, making them safer options for aircraft maintenance.