[Federal Register Volume 61, Number 129 (Wednesday, July 3, 1996)]
[Notices]
[Pages 34922-34923]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 96-16960]
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DEPARTMENT OF TRANSPORTATION
Aviation Rulemaking Advisory Committee; Transport Airplane and
Engine Issues--New Task
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of a new task assignment for the Aviation Rulemaking
Advisory Committee (ARAC).
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SUMMARY: Notice is given of a new task assigned to and accepted by the
Aviation Rulemaking Advisory Committee (ARAC). This notice informs the
public of the activities of ARAC.
FOR FURTHER INFORMATION CONTACT:
Stewart R. Miller, Manager, Transport Standards Staff, ANM-110, FAA,
Transport Airplane Directorate, Aircraft Certification Service, 1601
Lind Ave. SW., Renton, WA 98055-4056, telephone (206) 227-2190, fax
(206) 226-1320.
SUPPLEMENTARY INFORMATION:
Background
The FAA has established an Aviation Rulemaking Advisory Committee
to provide advice and recommendations to the FAA Administrator, through
the Associate Administrator for Regulation and Certification, on the
full range of the FAA's rulemaking activities with respect to aviation-
related issues. This includes obtaining advice and recommendations on
the FAA's commitment to harmonize its Federal Aviation Regulations
(FAR) and practices with its trading partners in Europe and Canada.
One area ARAC deals with is Transport Airplane and Engine issues.
These issues involve the airworthiness standards for transport category
airplanes in 14 CFR parts 25, 33, and 35 of the FAR and parallel
provisions in 14 CFR parts 121 and 135 of the FAR. The corresponding
European airworthiness standards for transport category airplanes are
contained in Joint Aviation Requirements (JAR)-25, JAR-E and JAR-P,
respectively. The corresponding Canadian Standards are contained in
Chapters 525, 533 and 535 respectively.
The Task
This notice is to inform the public that the FAA has asked ARAC to
provide advice and recommendation on the following harmonization task:
Engine Windmilling Imbalance Loads. Define criteria for
establishing the maximum level of engine imbalance that should be
considered, taking into account fan blade failures and other likely
causes of engine imbalance. Develop an acceptable methodology for
determining the dynamic airframe loads and accelerations resulting
from an imbalanced windmilling engine. Validate the proposed
methodology with a demonstrative ground or flight test program (as
deemed appropriate by ARAC) that has the objective of establishing
confidence in the proposed methodology. The validation process
should answer the following questions: (1) What are the parameters
to consider in determining the minimum degree of dynamic structural
modeling needed to properly represent the imbalanced condition; (2)
Is the proposed analytical methodology taken in conjunction with the
traditional ground vibration tests, flight flutter tests, and tests
performed under Sec. 33.94 of 14 CFR sufficient, or are there
additional tests and measurements that need to be made to address
this condition?
Within 12 months from the date of the published notice of new
task in the Federal Register, complete the above tasks and submit a
report to the FAA with recommendations detailing the criteria and
methodology.
ARAC Acceptance of Task
ARAC has accepted this task and has chosen to assign it to the
existing Loads and Dynamics Harmonization Working Group. The working
group will serve as staff to ARAC to assist ARAC in the analysis of the
assigned task. Working group recommendations must be reviewed and
approved by ARAC. If ARAC accepts the working group's recommendations,
it forwards them to the FAA as ARAC recommendations.
Working Group Activity
The Loads and Dynamics harmonization Working Group is expected to
comply with the procedures adopted by ARAC. As part of the
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procedures, the working group is expected to:
1. Recommend a work plan for completion of the tasks, including the
rational supporting such a plan, for consideration at the meeting of
ARAC to consider Transport Airplane and Engine Issues held following
publication of this notice.
2. Give a detailed conceptual presentation of the proposed
recommendations, prior to proceeding with the work stated in item 3
below.
3. For each task, draft appropriate documents with supporting
analyses, and/or any other related guidance material or collateral
documents the working group determines to be appropriate.
4. Provide a status report at each meeting of ARAC held to consider
Transport Airplane and Engine Issues.
Participation in the Working Goup
The Loads and Dynamics Harmonization Working Group is composed of
experts having an interest in the assigned task. A working group member
need not be a representative of a member of the full committee.
An individual who has expertise in the subject matter and wishes to
become a member of the working group should write to the person listed
under the caption FOR FURTHER INFORMATION CONTACT expressing that
desire, describing his or her interest in the tasks, and stating the
expertise he or she would bring to the working group. The request will
be reviewed by the assistant chair, the assistant executive director,
and the working group chair, and the individual will be advised whether
or not the request can be accommodated.
The Secretary of Transportation has determined that the formation
and use of ARAC are necessary and in the public interest in connection
with the performance of duties imposed on the FAA by law.
Meetings of ARAC will be open to the public, except as authorized
by section 10(d) of the Federal Advisory Committee Act. Meetings of the
Loads and Dynamics harmonization Working Group will not be open to the
public, except to the extent that individuals with an interest and
expertise are selected to participate. No public announcement of
working group meetings will be made.
Issued in Washington, DC, on June 26, 1996.
Chris A. Christie,
Executive Director, Aviation Rulemaking Advisory Committee.
[FR Doc. 96-16960 Filed 7-2-96; 8:45 am]
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