[Federal Register Volume 61, Number 129 (Wednesday, July 3, 1996)]
[Notices]
[Page 35062]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 96-17035]



  Federal Register / Vol. 61, No. 129 / Wednesday, July 3, 1996 / 
Notices  

[[Page 35062]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration


Proposed Advisory Circular 25.1435-1, Hydraulic System 
Certification Tests and Analysis

AGENCY: Federal Aviation Administration, DOT.

ACTION: Notice of availability of proposed advisory circular (AC) 
25.1435-1 and request for comments.

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SUMMARY: This notice announces the availability of and requests 
comments on proposed Advisory Circular (AC) 25.1435-1, Hydraulic System 
Certification Tests and Analysis. This AC provides guidance on 
acceptable means, but not the only means, of demonstrating compliance 
with the requirements of Sec. 25.1435 and related regulations 
pertaining to hydraulic systems. The proposed AC complements revisions 
to the airworthiness standards that are being proposed by a separate 
notice. This notice provides interested persons an opportunity to 
comment on the proposed AC.

DATES: Comments must be received on or before October 1, 1996.

ADDRESSES: Send all comments on the proposed AC to the Federal Aviation 
Administration, Attention: Mahinder K. Wahi, Flight Test and Systems 
Branch, ANM-111, Transport Airplane Directorate, Aircraft Certification 
Service, FAA, 1601 Lind Avenue 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:
Jan Thor, Regulations Branch, ANM-114, at the above address, telephone 
(206) 227-2127.

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 by submitting such written 
data, views, or arguments as they may desire. Commenters must identify 
the title of the AC and submit comments in triplicate to the address 
specified above. All comments received on or before the closing date 
for comments will be considered by the Transport Standards Staff before 
issuing the final AC.

Discussion

    In 1988, the FAA, in cooperation with the European Joint Aviation 
Authorities (JAA) and other organizations representing the American and 
European aerospace industries, began a process to harmonize the 
airworthiness requirements of the United States and the airworthiness 
requirements of Europe.
    In 1992, the harmonization effort was undertaken by the Aviation 
Rulemaking Advisory Committee (ARAC). A working group of industry and 
government hydraulic systems specialists of Europe and the United 
States was chartered by notice in the Federal Register (57 FR 58843, 
December 12, 1992). The working group was tasked to develop a draft 
notice of proposed rulemaking (NPRM) and any collateral documents such 
as advisory circulars concerning new or revised requirements for 
hydraulic systems and the associated test conditions for hydraulic 
systems installed in transport category airplanes (Sec. 25.1435). The 
JAA is to develop a similar proposal to amend the Joint Aviation 
Requirements (JAR) as necessary, to achieve harmonization.
    The advisory material made available via this notice was developed 
by the Hydraulic Systems Harmonization Working Group to ensure that the 
harmonized standards would be interpreted and applied consistently. It 
was presented to the FAA by the ARAC as a recommendation.
    Part 25 of the Federal Aviation Regulations (FAR) prescribes the 
United States airworthiness standards for transport category airplanes. 
Proposed AC 25.1435-1 provides guidelines that the FAA has found 
acceptable to demonstrate compliance with those airworthiness standards 
for hydraulic systems. Revisions to part 25 are being proposed by the 
FAA in a notice of proposed rulemaking published elsewhere in this 
issue of the Federal Register. That notice also describes the use of 
the Aviation Rulemaking Advisory Committee to develop both the proposed 
revisions to part 25 and the proposed AC 25.1435-1.
    Proposed AC 25.1435-1 provides additional guidance material and one 
means, but not the only means, of complying with the part 25 revisions 
proposed in Notice No. 96-[insert notice number of NPRM entitled, 
``Revision of Hydraulic Systems Airworthiness Standards to Harmonize 
with European Airworthiness Standards for Transport Category 
Airplanes'') published in the same edition of the Federal Register]. 
Issuance of the AC 25.1435-1 is contingent on final adoption of the 
proposed revision to part 25.

    Issued in Renton, Washington, on February 29, 1996.
James V. Devany,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service, ANM-100.
[FR Doc. 96-17035 Filed 7-2-96; 8:45 am]
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