FAA AMT Airframe Practice Exam 2025 – All-in-One Study Guide to Master Aviation Maintenance Technician Certification!

When repairing large, flat surfaces with polyester resins, using short strips of fiberglass in the bonded repair helps to reduce warpage because shorter strips have less inherent tension than larger strips. This method allows for more controlled application of the resin, leading to a more even distribution of material and minimizing the likelihood of warping during the curing process.

Option A (Applying more resin) can lead to excess resin buildup and uneven distribution, potentially causing warping. Option B (Using large strips of fiberglass) may introduce more tension across the surface, increasing the risk of warpage. Option D (Increasing the curing temperature) can also have adverse effects, such as premature curing or uneven thermal expansion, leading to warping issues as well.

Therefore, the most suitable method to reduce warpage when repairing large, flat surfaces with polyester resins is to use short strips of fiberglass in the bonded repair.