[Federal Register: November 6, 1998 (Volume 63, Number 215)]
[Notices]               
[Page 60038]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr06no98-125]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

 
Advisory Circular; Manufacturing Process of Premium Quality 
Titanium Alloy Rotating Engine Components

AGENCY: Federal Aviation Administration, DOT.

ACTION: Notice of issuance of Advisory Circular (AC).

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SUMMARY: This notice announces the issuance of Advisory Circular (AC), 
No. 33.15-1, Manufacturing Process of Premium Quality Titanium Alloy 
Rotating Engine Components. This AC provides guidance and information 
for compliance pertaining to the materials suitability and durability 
requirements, Sec. 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 Sec. 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.

DATES: Advisory Circular No. 33.15-1, was issued by the New England 
Aircraft Certification Service, Engine and Propeller Directorate on 
September 22, 1998.

FOR FURTHER INFORMATION CONTACT:
Tim Mouzakis, Engine and Propeller Standards Staff, ANE-110, 12 New 
England Executive Park, Burlington, MA, 01803, telephone (781) 238-
7114, fax (781) 238-7199.

SUPPLEMENTARY INFORMATION: 

Background

    Advisory Circulars 21-1B, 21-6A, 21-9A, 21-27, and 21.303-1A, 
provide a means to obtain and maintain production approvals; however, 
these documents do not fully cover the manufacturing processes used in 
the manufacture of premium quality titanium alloy forged rotating 
components for type certificated turbine engines. This AC, therefore, 
provides supplemental guidance for the establishment of manufacturing 
processes, in process material and component inspections, and finished 
component inspections, for manufacture of premium quality titanium 
alloy forged rotating components, such as disks, spacers, hubs, shafts, 
spools and impellers, but not blades.
    Interested parties were given the opportunity to review and comment 
on the draft AC during the proposal and development phases. Notice was 
published in the Federal Register on July 17, 1997 (62 FR 38338), to 
announce the availability of, and comment to the draft AC.
    This advisory circular, published under the authority granted to 
the Administrator by 49 U.S.C. 106(g), 4113, 44701-44702, 44704, 
provides guidance for these requirements.

    Issued in Burlington, Massachusetts, on September 22, 1998.
Jay J. Pardee,
Manager, Engine and Propeller Directorate, Aircraft Certification 
Service.
[FR Doc. 98-29783 Filed 11-5-98; 8:45 am]
BILLING CODE 4910-13-M