[Federal Register Volume 62, Number 137 (Thursday, July 17, 1997)]
[Notices]
[Pages 38338-38339]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 97-18787]


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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 availability of Proposed Advisory Circular (AC), AC 
No. 33.15-1, request for comments.

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SUMMARY: This notice announces the availability of requests comments on 
a proposed AC, No. 33-15-1, Manufacturing Process of Premium Quality 
Titanium Alloy rotating Engine Components. The AC provides information 
and guidance concerning an acceptable method, but not the only method, 
pertaining to the materials suitability and durability requirements of 
Sec. 33.15, as applicable to the manufacture of titanium alloy high 
energy rotating parts of aircraft engines.

DATES: Comments must be received on or before September 15, 1997.

ADDRESSES: Send all comments on the proposed AC to the Federal Aviation 
Administration, Attention: Engine & Propeller Directorate, Aircraft 
Certification Service, Engine & Propeller Standards Staff, ANE-110, 12 
New England Executive Park, Burlington, Massachusetts 01803.

FOR FURTHER INFORMATION CONTACT: Tim Mouzakis, Engine and Propeller 
Standards Staff, ANE-110, 12 New England Executive Park, Burlington,

[[Page 38339]]

MA, 01803, telephone (617) 238-7114, fax (617) 238-7199.

SUPPLEMENTARY INFORMATION: 

Comments Invited

    A copy of the subject AC may be obtained by contacting the person 
named above under FOR FURTHER INFORMATION CONTACT. Interested persons 
are invited to comment on the proposed AC, and to submit such written 
data, views, or arguments as they may desire. Commenters must identify 
the subject of the AC and submit comments in duplicate to the address 
specified above. All communications received on or before the closing 
date for comments will be considered by the New England Region Engine & 
Propeller Directorate, Aircraft Certification Service, before issuing 
the final AC.

Background

    The Federal Aviation Administration (FAA) established the Titanium 
Rotating Components Review Team (TRCRT) to review the adequacy of 
current efforts within the engine industry, and address the safety of 
titanium alloy high energy rotating components of turbine engines.
    In May of 1991, the TRCRT held a public meeting and presented a 
report consisting of recommendations and an implementation plan. In 
response to the TRCRT implementation plan, in 1991, the American 
Industries Association (AIA) Materials and Structures Committee was 
formed (AIA Project P341-2) to assist the FAA in developing an advisory 
circular to address the processing of titanium material used in 
critical rotating components of aircraft engines.
    The AIA Materials and Structures Committee found that existing AC's 
provide a means to obtain and maintain production approvals, however, 
these documents do not fully cover the manufacturing process used in 
the manufacture of premium quality titanium alloy forged rotating 
components for type certificated turbine establishment. This proposed 
AC therefore, provides supplemental guidance for the establishment of a 
manufacturing process, 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.
    This proposed advisory circular provides guidance and information 
for compliance pertaining to the materials suitability and durability 
requirements, as applicable, to the manufacture of titanium alloy high 
energy rotating parts of aircraft engines.

    Issued in Burlington, Massachusetts, on July 7, 1997.
James C. Jones,
Acting Manager, Engine and Propeller Directorate, Aircraft 
Certification Service.
[FR Doc. 97-18787 Filed 7-16-97; 8:45 am]
BILLING CODE 4910-13-M