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 . <EOS>