35062 Federal Register / Vol. 61, No. 129 / Wednesday, July 3, 1996 / Notices

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.

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 § 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 (§ 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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