Airworthiness Directives; Short Brothers Model SD3-60, SD3-60 SHERPA, and SD3-SHERPA Series Airplanes

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This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Short Brothers Model SD3-60, SD3-60 SHERPA, and SD3-SHERPA series airplanes. This proposal would require a one-time inspection of the two power cables to the heated windshield to detect inadequate clearance, chafing, and inadequate support. This proposal would also require corrective action, if necessary, including increasing the clearance, providing additional support, re-routing, and replacing power cables, as applicable. This action is necessary to prevent discrepancies of the two power cables to the heated windshield from causing an electrical short circuit with possible smoke and fire in the cockpit. This action is intended to address the identified unsafe condition.