To excel as a Part 135 Cargo SIC (Second-in-Command), you need a commercial pilot certificate with instrument and multi-engine ratings, relevant flight hours, and knowledge of FAA Part 135 regulations. Familiarity with avionics, navigation systems, company dispatch software, and safety management systems is crucial for operational effectiveness. Strong communication, teamwork, and problem-solving abilities are valuable soft skills in this crew-based, dynamic environment. These skills ensure flight safety, regulatory compliance, and efficient cargo operations under varying schedules and conditions.