The chip detector sensor is located _________.

The chip detector sensor is located in the reduction gearbox. This placement is essential because the reduction gearbox is involved in the transmission of power from the engine and is subject to various mechanical stresses. Over time, metal particles and debris can be generated due to wear or damage within the gearbox.

The function of the chip detector is to identify these metallic particles, which can indicate potential issues such as gear wear or failure. By detecting these chips early, maintenance personnel can take proactive measures to address any anomalies and perform necessary repairs before a more significant failure occurs, ultimately ensuring the reliability and safety of the aircraft’s operation.

The other options indicate locations that are not specifically tasked with monitoring the specific conditions that would lead to metal chip formation in the gear mechanism. The hot oil return line, oil tank, and cooling assembly serve other functions in the lubrication and thermal management systems of the engine but do not focus on detecting internal wear and debris as effectively as the reduction gearbox does.