This specification contains requirements for fusion welding of aerospace hardware. It is to be used in conjunction with the Engineering Authority's design handbooks or their accepted data. When conformance to this specification is stipulated in contract documents@ all provisions of this specification shall be complied with@ except for those provisions that the Engineering Authority or contract documents specifically exempt or those optional provisions that shall be applied when specified by the contract documents. The following is a summary of the specification sections: Section 1. General Requirements: basic information on the scope and provisions of this specification. Section 2. Applicable Documents: a listing of the documents referenced in the text of this specification. Section 3. Design of Welded Connections: requirements and guidance information for the design of welded connections. Section 4. Welding Performance and Procedure Qualification: qualification requirements for welders@ welding operators and welding procedures. Section 5. Fabrication: requirements for preparation@ assembly and workmanship when welding aerospace hardware. Section 6. Inspection: criteria for inspector qualification@ responsibilities of inspectors@ acceptance of production welds@ and standard requirements for performing visual inspection and nondestructive examination (NDE). Section 7. Repair of Existing Structures: requirements for repair of existing aerospace hardware. Section 8. Welding of Nonflight Hardware: requirements for welding nonflight hardware.