《AC33.15-1 Manufacturing Process of Premium Quality Titanium Alloy Rotating Engine Components》.pdf

U.S. Department Advisory of Transportation Federal Aviation Circular Administration Subject: Manufacturing Process of Date: 9/22/98 AC No . 33.15-1 Premium Quality Titanium Alloy Rotating Engine Components Initiated by : ANE-110 Change: 1. PURPOSE. This advisory circular (AC) provides guidance and information for compliance with the provisions under Title 14 under the Code of Federal Regulations, part 33 (14 CFR 33) pertaining to the materials suitability and durability requirements, § 33.15, as applicable to the manufacture of titanium alloy high energy rotating parts of aircraft engines. Like all AC material, this AC is not, in itself, mandatory and does not constitute a regulation. It is issued to provide an acceptable means, but not the only means, of compliance with § 33.15. While these guidelines are not mandatory, they are derived from extensive Federal Aviation Administration (FAA) and industry experience in determining compliance with the pertinent regulations. 2. RELATED READING MATERIAL. Title 14 of the Code of Federal Regulations, part 33 AC 33.2B: Aircraft Engine Type Certification Handbook AC 33.3: Turbine and Compressor Rotor Type Certification Substantiation Procedures AC 33.4: Design Consideration Concerning the use of Titanium in Aircraft Turbine Engines. 3. DEFINITIONS. Bar - Converted material having a cross section less than or equal to 16 square inches (103 cm2), and a width less than five times the thickness. AC 33.15-1 September 22, 1998 Billet - Converted material having a constant round cross section greater than 16 square inches (103 cm2). Bottom Charge - The material placed in the VAR crucible to protect the crucible during arc initiation. CHM - The Cold Hearth Melting process (i.e., EBM or PAM) whe