A propeller assembly, comprising: a propeller hub configured to rotatably support a propeller blade having a heating element; a plurality of slip rings electrically connected to the heating element, the plurality of slip rings disposed on a spinner bulkhead attached to the propeller hub; and a brush block assembly configured to engage the plurality of slip rings to transfer electric power from a power source to the heating element, the brush block assembly comprising: a brush block housing defining an opening extending from a front wall of the brush block housing; an insert received within the opening of the brush block housing, the insert having a first aperture that extends from a first insert face that is disposed proximate the front wall towards a second insert face; a mounting bracket connected to the brush block housing and configured to be disposed on a reduction gearbox; a first electrically conductive brush extending from the insert disposed in the brush block housing and configured to engage a slip ring of the plurality of slip rings, the first electrically conductive brush includes a brush body that extends between a first brush end and a second brush end; and a first wear indicator connected to the first electrically conductive brush extending towards the front wall of the brush block housing, the first wear indicator includes a base disposed about the second brush end and a wear arm extending from the base towards the first brush end. a propeller hub configured to rotatably support a propeller blade having a heating element; a plurality of slip rings electrically connected to the heating element, the plurality of slip rings disposed on a spinner bulkhead attached to the propeller hub; and a brush block assembly configured to engage the plurality of slip rings to transfer electric power from a power source to the heating element, the brush block assembly comprising: a brush block housing defining an opening extending from a front wall of the brush block housing; an insert received within the opening of the brush block housing, the insert having a first aperture that extends from a first insert face that is disposed proximate the front wall towards a second insert face; a mounting bracket connected to the brush block housing and configured to be disposed on a reduction gearbox; a first electrically conductive brush extending from the insert disposed in the brush block housing and configured to engage a slip ring of the plurality of slip rings, the first electrically conductive brush includes a brush body that extends between a first brush end and a second brush end; and a first wear indicator connected to the first electrically conductive brush extending towards the front wall of the brush block housing, the first wear indicator includes a base disposed about the second brush end and a wear arm extending from the base towards the first brush end. a brush block housing defining an opening extending from a front wall of the brush block housing; an insert received within the opening of the brush block housing, the insert having a first aperture that extends from a first insert face that is disposed proximate the front wall towards a second insert face; a mounting bracket connected to the brush block housing and configured to be disposed on a reduction gearbox; a first electrically conductive brush extending from the insert disposed in the brush block housing and configured to engage a slip ring of the plurality of slip rings, the first electrically conductive brush includes a brush body that extends between a first brush end and a second brush end; and a first wear indicator connected to the first electrically conductive brush extending towards the front wall of the brush block housing, the first wear indicator includes a base disposed about the second brush end and a wear arm extending from the base towards the first brush end.