How long must a wing spar splice remain under pressure?

The duration for which a wing spar splice must remain under pressure is crucial for ensuring that the adhesive used in the construction meets its curing requirements. Typically, an insufficient cure time can lead to weakened joints, potentially compromising structural integrity.

In the aviation industry, composite and wood components must adhere to strict guidelines to maintain safety and performance. The recommended curing time of at least 7 hours ensures that the adhesive fully bonds the materials and reaches its maximum strength. This extended time allows the adhesive to undergo any necessary chemical reactions and drying processes, achieving the desired structural characteristics.

Other options, such as shorter time frames, may not provide adequate curing and might lead to riskier outcomes, making them not preferable in aviation applications where safety is paramount. Therefore, the choice of 7 hours offers a balance between practicality in assembly processes and the integrity required for flight-critical components.