A lower horizontal stabilizer streamlined brace is to be repaired by welding. What materials should be used?

The use of an outside sleeve that is at least the same gauge as the original material and has a minimum length of 9.128 inches is appropriate for repairing a lower horizontal stabilizer streamlined brace. This choice ensures adequate structural integrity and strength during the repair.

The reason for using an outside sleeve rather than an internal sleeve or other methods is due to the requirements for maintaining the original strength and aerodynamic efficiency of the streamlined brace. An exterior design allows for a proper fit and distribution of stress across the braced area, helping to prevent issues such as buckling or local failure. The specified minimum length also plays a significant role in ensuring a sufficient overlap for effective load transfer.

With regards to requirements for repairs, adhering to the original materials and specifications is essential for maintaining airworthiness and ensuring that any modifications continue to comply with aviation regulations and standards.