As a flight test engineer, your job is to oversee testing the operations and performance of aircraft in line with FAA regulations and guidelines from the manufacturer. This job frequently involves planning, managing, coordinating, and executing a full spectrum of aircraft testing, including tests on all mechanical and electronic systems. Some details of this job vary based on the kinds of aircraft with which you work. Flight test engineers may work with everything from single-engine civilian aircraft to large, military planes. Fulfilling the responsibilities and duties of a flight test engineer often requires meeting the qualifications for a security clearance, studying guides and technical manuals, contacting part manufacturers, and excellent communication skills.