[Federal Register: August 10, 1999 (Volume 64, Number 153)]
[Notices]               
[Page 43579-43580]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr10au99-132]                         

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

 
Proposed Advisory Circular (AC) 25.735-1X, Brakes and Braking 
Systems Certification Tests and Analysis

AGENCY: Federal Aviation Administration, DOT.

ACTION: Notice of availability of proposed advisory circular and 
request for comments.

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SUMMARY: This notice announces the availability of and requests 
comments on a proposed advisory circular which provides guidance as to 
acceptable means of demonstrating compliance with a separate notice of 
proposed rulemaking on the subject of brakes and braking systems 
published elsewhere in this issue of the Federal Register. This notice 
provides interested person an opportunity to comment on the proposed AC 
concurrently with the proposed rulemaking, as well as a proposed 
Technical Standard Order on the same subject also published elsewhere 
in this issue of the Federal Register.

DATES: Comments must be received on or before November 8, 1999.

ADDRESSES: Send all comments on the proposed advisory circular to the 
Federal Aviation Administration, Attention, Mahinder Wahi, Propulsion/
Mechanical Systems Branch, ANM-112, Transport Airplane Directorate, 
Aircraft Certification Service, 1601 Lind Ave SW., Renton, WA 98055-
4056. Comments may be examined at the above address between 7:30 a.m. 
and 4:00 p.m. weekdays, except Federal holidays.

FOR FURTHER INFORMATION CONTACT: Mahinder Wahi at the above address, 
telephone (425)) 227-2142; facsimile (425) 227-1320; or e-mail 
mahinder.wahi@faa.gov.

SUPPLEMENTARY INFORMATION:

Comments Invited

    Interested person are invited to comment on the proposed AC by 
submitting such written data, views, or arguments as they desire to the 
above specified address. Comments must identify the title of the AC and 
submit comments in duplicate to the address specified above. All 
comments received on or before the closing date for comments will be 
considered by the Transport Airplane Directorate before issuing the 
final AC.

Discussion

    Although 14 CFR part 25 and the Joint Aviation Requirements, JAR-
25, are very similar, they are not identical. Differences between the 
FAR and the JAR can result in substantial additional costs when 
airplanes are type certificated to both standards. Starting in 1992, 
the harmonization effort for various systems-related airworthiness 
requirements was undertaken by the Aviation Rulemaking Advisory 
Committee (ARAC). A working group (the Braking Systems Harmonization 
Working Group)) of industry and government braking systems specialists 
from Europe, the United States, and Canada was chartered by notice in 
the Federal Register (59 FR 30080, June 10, 1994). The working group 
was tasked to develop harmonized standards and any

[[Page 43580]]

collateral documents, such as advisory circulars, concerning new or 
revised requirements for braking systems, and the associated test 
conditions for braking systems, installed in transport category 
airplanes (Secs. 25.731 and 25.735). The Joint Aviation Authorities 
(JAA)) have developed a similar proposal to amend JAR 25.731 and JAR 
25.735, as necessary, to achieve harmonization.
    The advisory material contained in the proposed AC was developed by 
the Braking Systems Harmonization Working Group to ensure consistent 
application of the standards proposed under separate notice, ``Revision 
of Braking Systems Airworthiness Standards to Harmonize with European 
Airwothiness Standards for Transport Category Airplanes,'' and a 
corresponding proposed Technical Standards Order (TSO-C135), 
``Transport Airplane Wheels and Wheel and Brake Assemblies,'' published 
elsewhere in this issue of the Federal Register. The corresponding 
advisory material and TSO developed by the JAA are AMJ 25.735 and JTSO-
C135.
    Issuance of AC 25.735-1X is contingent on final adoption of the 
proposed amendment to part 25.

How To Obtain Copies

    A copy of proposed AC 25.735-1X may be obtained by contacting the 
person named above under For Further Information Contact.

    Issued in Washington, D.C. on August 3, 1999.
James C. Jones,
Manager, Aircraft Engineering Division, Aircraft Certification Service.
[FR Doc. 99-20519 Filed 8-9-99; 8:45 am]
BILLING CODE 4910-13-M