[Federal Register: September 30, 1999 (Volume 64, Number 189)] [Notices] [Page 52819-52820] From the Federal Register Online via GPO Access [wais.access.gpo.gov] [DOCID:fr30se99-108] ======================================================================= ----------------------------------------------------------------------- DEPARTMENT OF TRANSPORTATION Federal Aviation Administration Proposed Advisory Circular 25-XX, Transport Airplane Propulsion Engine and Auxiliary Power Unit Installation Certification Handbook-- The Propulsion Mega AC AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice of availability of proposed Advisory Circular (AC) 25-XX and request for comments. ----------------------------------------------------------------------- SUMMARY: This document announces the availability of and requests comment on a proposed advisory circular (AC) that provides guidance on methods acceptable to the Administrator for showing compliance with the type certification requirements for propulsion engine and auxiliary power unit (APU) installations as they apply to transport category airplanes. This notice is necessary to give all interested persons an opportunity to present their views on the proposed AC. DATE: Comments must be received on or before December 29, 1999. ADDRESS: Send all comments on the proposed AC to: Federal Aviation Administration (FAA), Attention: Steve Happenny, Propulsion/Mechanical Systems Branch, ANM-112, Transport Airplane Directorate, Aircraft Certification Service, 1601 Lind Avenue SW., Renton, Washington 98055- 4056. Comments may be inspected at the above address between 7:30 a.m. and 4:00 p.m. weekdays, except Federal holidays. FOR FURTHER INFORMATION CONTACT: Jill DeMarco, Program Management Branch, ANM-114, FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington 98055-4056; telephone (425) 227-1313; fax (425) 227-1320. SUPPLEMENTARY INFORMATION: Comments Invited Interested persons are invited to comment on the proposed AC by submitting such written data, views, or arguments as they may desire. Commenters must identify the AC by title and submit comments in duplicate to the address specified above. The Transport Airplane Directorate of the Federal Aviation Administration (FAA) will consider all communications received on or before the closing date for comments before issuing the final AC. Availability of Proposed AC The proposed AC can be found and downloaded from the Internet at http://www.faa.gov/avr/air/airhome.htm, at the link titled ``Draft Advisory Circulars.'' Requests for copies should be directed to the person named above under the caption FOR FURTHER INFORMATION CONTACT. Please specify whether a paper copy or a CD-ROM (Microsoft Word Version 6.0/Windows 95 format) copy is needed. Because of the large size of this proposed AC (approximately 1,200 pages) and the time necessary for copying the document, expect extra time for fulfilling requests for paper copies. Discussion The proposed advisory circular (AC) provides one comprehensive source of FAA policy and guidance on various methods acceptable to the Administrator for showing compliance with the type certification requirements for propulsion engine and auxiliary power unit (APU) installations on transport category airplanes. The proposed AC contains information and material concerning all facets of propulsion system certification that have been derived from various sources, such as: Title 14, Code of Federal Regulations (commonly referred to as the Federal Aviation Regulations), AC's, FAA Issue Papers, Special Conditions, Technical Standard Orders (TSO), FAA internal policy memos, FAA technical reports, documents issued by the Society of Automotive Engineers (SAE), and General Aviation Manufacturers Association (GAMA) specifications. The material contained in the proposed AC is intended for use during propulsion certification activities by airplane manufacturers, modifiers, foreign regulatory authorities, and Federal Aviation Administration (FAA) airplane type certification engineers. The policy and guidance provided in the document has been applied previously and found to be acceptable to the FAA for demonstrating compliance with the certification regulations pertaining to propulsion (engine and APU) installations on transport category airplanes. The methods and procedures described have evolved through many years and represent current certification practice. The FAA's objective in issuing this AC is to formalize existing policy and guidance so that the public and FAA [[Page 52820]] personnel have access to this information in one document. In gathering all relevant material into one document, the consequent size of the proposed AC is necessarily large; for this reason, the informal title of ``The Propulsion Mega AC'' is used throughout the document to distinguish it from others that are referenced. Issued in Renton, Washington, on September 23, 1999. D. L. Riggin, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 99-25456 Filed 9-29-99; 8:45 am] BILLING CODE 4910-13-U