FAA Advisory Circular 43.13-1B
Acceptable Methods, Techniques, and Practices
Aircraft Inspection and Repair
AC 43.13-1B
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4. Metal Structure, Welding, and Brazing
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1. Identification of Metals
Subsections
4-1. General
4-2. Identification of Steel Stock
4-3. Interchangeability of Steel Tubing
4-4. Identification of Aluminum
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