FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

Applying pressure on both strokes (A) may cause uneven wear on the file and dull its teeth quickly. Using a circular motion (C) can also result in uneven wear and may not effectively remove material from the metal. No pressure is needed (D) because the sharp teeth of the file should do the work for you. The most efficient and effective method is to apply pressure on the forward stroke only (B), as this allows the file to cut smoothly and evenly.