[Federal Register Volume 64, Number 105 (Wednesday, June 2, 1999)]
[Proposed Rules]
[Pages 29607-29608]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 99-13876]
[[Page 29607]]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 98-NM-270-AD]
RIN 2120-AA64
Airworthiness Directives; Airbus Model A319, A320, and A321
Series Airplanes
AGENCY: Federal Aviation Administration, DOT.
ACTION: Notice of proposed rulemaking (NPRM).
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SUMMARY: This document proposes the adoption of a new airworthiness
directive (AD) that is applicable to certain Airbus Model A319, A320,
and A321 series airplanes. This proposal would require modification of
the 90VU electronics rack umbrellas, the 91VU upper shelf assembly, the
cockpit drain circuit, and the electrical wire routing above the 90VU
electronics rack. This proposal is prompted by issuance of mandatory
continuing airworthiness information by a foreign civil airworthiness
authority. The actions specified by the proposed AD are intended to
prevent damage to computer electrical connectors due to ingress of
water into the avionics bay, which could result in malfunctioning of
the avionics computers.
DATES: Comments must be received by July 2, 1999.
ADDRESSES: Submit comments in triplicate to the Federal Aviation
Administration (FAA), Transport Airplane Directorate, ANM-114,
Attention: Rules Docket No. 98-NM-270-AD, 1601 Lind Avenue, SW.,
Renton, Washington 98055-4056. Comments may be inspected at this
location between 9:00 a.m. and 3:00 p.m., Monday through Friday, except
Federal holidays.
The service information referenced in the proposed rule may be
obtained from Airbus Industrie, 1 Rond Point Maurice Bellonte, 31707
Blagnac Cedex, France. This information may be examined at the FAA,
Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton,
Washington.
FOR FURTHER INFORMATION CONTACT: Norman B. Martenson, Manager,
International Branch, ANM-116, FAA, Transport Airplane Directorate,
1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (425)
227-2110; fax (425) 227-1149.
SUPPLEMENTARY INFORMATION:
Comments Invited
Interested persons are invited to participate in the making of the
proposed rule by submitting such written data, views, or arguments as
they may desire. Communications shall identify the Rules Docket number
and be submitted in triplicate to the address specified above. All
communications received on or before the closing date for comments,
specified above, will be considered before taking action on the
proposed rule. The proposals contained in this notice may be changed in
light of the comments received.
Comments are specifically invited on the overall regulatory,
economic, environmental, and energy aspects of the proposed rule. All
comments submitted will be available, both before and after the closing
date for comments, in the Rules Docket for examination by interested
persons. A report summarizing each FAA-public contact concerned with
the substance of this proposal will be filed in the Rules Docket.
Commenters wishing the FAA to acknowledge receipt of their comments
submitted in response to this notice must submit a self-addressed,
stamped postcard on which the following statement is made: ``Comments
to Docket Number 98-NM-270-AD.'' The postcard will be date stamped and
returned to the commenter.
Availability of NPRMs
Any person may obtain a copy of this NPRM by submitting a request
to the FAA, Transport Airplane Directorate, ANM-114, Attention: Rules
Docket No. 98-NM-270-AD, 1601 Lind Avenue, SW., Renton, Washington
98055-4056.
Discussion
The Direction Generale de l'Aviation Civile (DGAC), which is the
airworthiness authority for France, has notified the FAA that an unsafe
condition may exist on certain Airbus Model A319, A320, and A321 series
airplanes. The DGAC advises that it has received reports of water
dripping into the avionics bay. Analysis by the manufacturer has shown
that the computers in the avionics bay may not be adequately protected
from ingress of water. This condition, if not corrected, could result
in damage to computer electrical connectors due to ingress of water
into the avionics bay, and consequent malfunctioning of the avionics
computers.
Related AD's
The FAA has issued AD 98-20-04, amendment 39-10770 (63 FR 50129,
September 21, 1998), which requires replacing certain toilet rinse
valves with modified rinse valves.
The FAA also has issued AD 99-02-03, amendment 39-10992 (64 FR
2552, January 15, 1999), which requires installation of a rubber strip
and replacement of connection sheets and the seal retainer on the
avionics compartment access door with new parts; and installation of
drip pans and additional drain gutters on the avionics racks.
Explanation of Relevant Service Information
Airbus has issued Service Bulletin A320-25-1186, Revision 01, dated
September 23, 1998, which describes procedures for modification of the
90VU electronics rack umbrellas, the 91VU upper shelf assembly, the
cockpit drain circuit, and the electrical wire routing above the 90VU
electronics rack. Accomplishment of modifications specified in the
service bulletin is intended to adequately address the identified
unsafe condition. The DGAC classified this service bulletin as
mandatory and issued French airworthiness directive 98-178-115(B),
dated May 6, 1998, in order to assure the continued airworthiness of
these airplanes in France.
FAA's Conclusions
These airplane models are manufactured in France and are type
certificated for operation in the United States under the provisions of
section 21.29 of the Federal Aviation Regulations (14 CFR 21.29) and
the applicable bilateral airworthiness agreement. Pursuant to this
bilateral airworthiness agreement, the DGAC has kept the FAA informed
of the situation described above. The FAA has examined the findings of
the DGAC, reviewed all available information, and determined that AD
action is necessary for products of this type design that are
certificated for operation in the United States.
Explanation of Requirements of Proposed Rule
Since an unsafe condition has been identified that is likely to
exist or develop on other airplanes of the same type design registered
in the United States, the proposed AD would require accomplishment of
the actions specified in the service bulletin described previously.
Cost Impact
The FAA estimates that 140 Airbus Model A319, A320, and A321 series
airplanes of U.S. registry would be affected by this proposed AD, that
it
[[Page 29608]]
would take approximately 19 work hours per airplane to accomplish the
proposed actions, and that the average labor rate is $60 per work hour.
Required parts would be supplied by the manufacturer at no cost to the
operators. Based on these figures, the cost impact of the proposed AD
on U.S. operators is estimated to be $159,600, or $1,140 per airplane.
The cost impact figure discussed above is based on assumptions that
no operator has yet accomplished any of the proposed requirements of
this AD action, and that no operator would accomplish those actions in
the future if this AD were not adopted.
Regulatory Impact
The regulations proposed herein would not have substantial direct
effects on the States, on the relationship between the national
government and the States, or on the distribution of power and
responsibilities among the various levels of government. Therefore, in
accordance with Executive Order 12612, it is determined that this
proposal would not have sufficient federalism implications to warrant
the preparation of a Federalism Assessment.
For the reasons discussed above, I certify that this proposed
regulation (1) is not a ``significant regulatory action'' under
Executive Order 12866; (2) is not a ``significant rule'' under the DOT
Regulatory Policies and Procedures (44 FR 11034, February 26, 1979);
and (3) if promulgated, will not have a significant economic impact,
positive or negative, on a substantial number of small entities under
the criteria of the Regulatory Flexibility Act. A copy of the draft
regulatory evaluation prepared for this action is contained in the
Rules Docket. A copy of it may be obtained by contacting the Rules
Docket at the location provided under the caption ADDRESSES.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Safety.
The Proposed Amendment
Accordingly, pursuant to the authority delegated to me by the
Administrator, the Federal Aviation Administration proposes to amend
part 39 of the Federal Aviation Regulations (14 CFR part 39) as
follows:
PART 39--AIRWORTHINESS DIRECTIVES
1. The authority citation for part 39 continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
Sec. 39.13 [Amended]
2. Section 39.13 is amended by adding the following new
airworthiness directive:
Airbus Industrie: Docket 98-NM-270-AD.
Applicability: Models A319, A320, and A321 series airplanes on
which Airbus Modification 25995 has not been accomplished,
certificated in any category.
Note 1: This AD applies to each airplane identified in the
preceding applicability provision, regardless of whether it has been
otherwise modified, altered, or repaired in the area subject to the
requirements of this AD. For airplanes that have been modified,
altered, or repaired so that the performance of the requirements of
this AD is affected, the owner/operator must request approval for an
alternative method of compliance in accordance with paragraph (b) of
this AD. The request should include an assessment of the effect of
the modification, alteration, or repair on the unsafe condition
addressed by this AD; and, if the unsafe condition has not been
eliminated, the request should include specific proposed actions to
address it.
Compliance: Required as indicated, unless accomplished
previously.
To prevent damage to computer electrical connectors due to
ingress of water into the avionics bay, which could result in
malfunctioning of the avionics computers, accomplish the following:
Modification
(a) Within 2 years after the effective date of this AD, modify
the 90VU electronics rack umbrellas, the 91VU upper shelf assembly,
the cockpit drain circuit, and the electrical wire routing above the
90VU electronics rack; in accordance with Airbus Service Bulletin
A320-25-1186, Revision 01, dated September 23, 1998.
Note 2: Accomplishment of the modification required by paragraph
(a) of this AD in accordance with Airbus Service Bulletin A320-25-
1186, dated December 1, 1997, prior to the effective date of this
AD, is considered acceptable for compliance with the requirements of
this AD.
Alternative Methods of Compliance
(b) An alternative method of compliance or adjustment of the
compliance time that provides an acceptable level of safety may be
used if approved by the Manager, International Branch, ANM-116, FAA,
Transport Airplane Directorate. Operators shall submit their
requests through an appropriate FAA Principal Maintenance Inspector,
who may add comments and then send it to the Manager, International
Branch, ANM-116.
Note 3: Information concerning the existence of approved
alternative methods of compliance with this AD, if any, may be
obtained from the International Branch, ANM-116.
Special Flight Permits
(c) Special flight permits may be issued in accordance with
sections 21.197 and 21.199 of the Federal Aviation Regulations (14
CFR 21.197 and 21.199) to operate the airplane to a location where
the requirements of this AD can be accomplished.
Note 4: The subject of this AD is addressed in French
airworthiness directive 98-178-115(B), dated May 6, 1998.
Issued in Renton, Washington, on May 21, 1999.
D.L. Riggin,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 99-13876 Filed 6-1-99; 8:45 am]
BILLING CODE 4910-13-P
