FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

The basis for the strength classification of fabrics used in aircraft covering is primarily determined by their tensile strength. Tensile strength refers to the maximum amount of tensile (stretching) stress that a material can withstand before breaking. In the context of aircraft covering, high tensile strength is crucial to ensure that the fabric can withstand the stresses and forces encountered during flight and maintain structural integrity over time.

Regarding the other options:

- Weight per square yard is a consideration for the overall weight of the fabric but not the primary basis for strength classification.

- Color fastness refers to the fabric's ability to retain its color over time and is unrelated to its strength classification.

- Water resistance is important for protecting the aircraft structure from moisture but is not the primary factor in determining the strength classification of fabrics used in aircraft covering.