FAA AMT Airframe Practice Exam 2026 – All-in-One Study Guide to Master Aviation Maintenance Technician Certification!

Using a standard twist drill or a high-speed steel drill would cause the Plexiglas to crack or chip due to the high speeds and temperatures generated during drilling. Using a cobalt drill bit might be less likely to cause cracking, but it still may not drill the hole with enough precision. The best option is a specially modified twist drill which has been designed specifically for drilling through Plexiglas, with modifications such as lower speeds and special cutting edges to prevent cracking and ensure precision.