[Federal Register Volume 65, Number 21 (Tuesday, February 1, 2000)]
[Proposed Rules]
[Pages 4781-4782]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: X00-10201]



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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 99-NM-263-AD]
RIN 2120-AA64


Airworthiness Directives; McDonnell Douglas Model MD-11 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 McDonnell Douglas Model 
MD-11 series airplanes. This proposal would require a one-time detailed 
visual inspection of a certain passenger seat wire assembly to detect 
chafed or damaged wires; repair, if necessary; and installation of 
protective sleeving. This proposal is prompted by a report of arcing 
emanating from a certain passenger seat wire assembly. The actions 
specified by the proposed AD are intended to prevent chafing of the 
passenger seat wire assembly against a bracket at the lower sidewall 
panel due to insufficient clearance between the bracket and seat wire 
assembly, which could result in arcing damage to the passenger seat 
wire assembly and consequent smoke and fire in the main cabin.

DATES:  Comments must be received by March 17, 2000.

ADDRESSES:  Submit comments in triplicate to the Federal Aviation 
Administration (FAA), Transport Airplane Directorate, ANM-114, 
Attention: Rules Docket No. 99-NM-263-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 Boeing Commercial Aircraft Group, Long Beach Division, 
3855 Lakewood Boulevard, Long Beach, California 90846, Attention: 
Technical Publications Business Administration, Dept. C1-L51 (2-60). 
This information may be examined at the FAA, Transport Airplane 
Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, 
Transport Airplane Directorate, Los Angeles Aircraft Certification 
Office, 3960 Paramount Boulevard, Lakewood, California.

FOR FURTHER INFORMATION CONTACT:  Brett Portwood, Aerospace Engineer, 
Systems and Equipment Branch, ANM-130L, FAA, Transport Airplane 
Directorate, Los Angeles Aircraft Certification Office, 3960 Paramount 
Boulevard, Lakewood, California 90712-4137; telephone (562) 627-5350; 
fax (562) 627-5210.

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 99-NM-263-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. 99-NM-263-AD, 1601 Lind Avenue, SW., Renton, Washington 
98055-4056.

Supplementary Information

    As part of its practice of re-examining all aspects of the service 
experience of a particular aircraft whenever an accident occurs, the 
FAA has become aware of an instance in which a seat control circuit 
breaker tripped while a crew member was checking a problem with the 
controls of a first class passenger seat. The circuit breaker was reset 
and subsequently an arc was observed emanating from the passenger seat 
wire assembly at the base of the sidewall panel at fuselage station 
Y=675. This incident occurred on a McDonnell Douglas Model MD-11 series 
airplane. This arcing caused a foam material to ignite. Investigation 
revealed that the passenger seat wire assembly had been chafing on a 
bracket at the lower sidewall panel. This condition has been attributed 
to insufficient clearance between the bracket and seat wire assembly. 
This condition, if not corrected, could result in smoke and fire in the 
main cabin.
    This incident is not considered to be related to an accident that 
occurred off the coast of Nova Scotia involving a McDonnell Douglas 
Model MD-11 series airplane. The cause of that accident is still under 
investigation.

Other Related Rulemaking

    The FAA, in conjunction with Boeing and operators of Model MD-11 
series airplanes, is continuing to review all aspects of the service 
history of those airplanes to identify potential unsafe conditions and 
to take appropriate corrective actions. This proposed airworthiness 
directive (AD) is one of a series of actions identified during that 
process. The process is continuing and the FAA may consider additional 
rulemaking actions as further results of the review become available.

Explanation of Relevant Service Information

    The FAA has reviewed and approved McDonnell Douglas Alert Service 
Bulletin MD11-24A152, dated August 9, 1999, which describes procedures 
for a one-time detailed visual inspection of the passenger seat wire 
assembly to detect chafed or damaged wires; repair, if necessary; and 
installation of protective sleeving. Accomplishment of the actions 
specified in the service bulletin is intended to adequately address the 
identified unsafe condition.

Explanation of Requirements of Proposed Rule

    Since an unsafe condition has been identified that is likely to 
exist or develop on other products of this same type design, this 
proposed AD would require accomplishment of the actions specified in 
the service bulletin described previously.

Cost Impact

    There are approximately 128 airplanes of the affected design in the 
worldwide fleet. The FAA estimates that 32 airplanes of U.S. registry 
would be affected by this proposed AD.
    It would take approximately 2 work hour per airplane to accomplish 
the proposed inspection, at an average labor

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rate of $60 per work hour. Based on these figures, the cost impact of 
the inspection proposed by this AD on U.S. operators is estimated to be 
$3,840, or $120 per airplane.
    It would take approximately 2 work hours per airplane to accomplish 
the proposed installation of protective sleeving, at an average labor 
rate of $60 per work hour. Based on these figures, the cost impact of 
the installation proposed by this AD on U.S. operators is estimated to 
be $3,840, or $120 per airplane.
    The cost impact figures discussed above are 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 a substantial direct 
effect 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, it 
is determined that this proposal would not have federalism implications 
under Executive Order 13132.
    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:

McDonnell Douglas: Docket 99-NM-263-AD.

    Applicability: Model MD-11 series airplanes, as listed in 
McDonnell Douglas Alert Service Bulletin MD11-24A152, dated August 
9, 1999; certificated in any category.


    Note 1:  This AD applies to each airplane identified in the 
preceding applicability provision, regardless of whether it has been 
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 chafing of the passenger seat wire assembly against a 
bracket at the lower sidewall panel due to insufficient clearance 
between the bracket and seat wire assembly, which could result in 
arcing damage to the passenger seat wire assembly and consequent 
smoke and fire in the main cabin, accomplish the following:

Inspection, Installation, and Repair, If Necessary

    (a) Within 6 months after the effective date of this AD, perform 
a detailed visual inspection of the passenger seat wire assembly to 
detect chafed or damaged wires, and install protective sleeving, in 
accordance with McDonnell Douglas Alert Service Bulletin MD11-
24A152, dated August 9, 1999. If any chafed or damaged wire is 
found, prior to further flight, repair in accordance with the 
service bulletin.


    Note 2:  For the purposes of this AD, a detailed visual 
inspection is defined as: ``An intensive visual examination of a 
specific structural area, system, installation, or assembly to 
detect damage, failure, or irregularity. Available lighting is 
normally supplemented with a direct source of good lighting at 
intensity deemed appropriate by the inspector. Inspection aids such 
as mirror, magnifying lenses, etc., may be used. Surface cleaning 
and elaborate access procedures may be required.''

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, Los Angeles Aircraft Certification 
Office (ACO), 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, Los Angeles ACO.

    Note 3:  Information concerning the existence of approved 
alternative methods of compliance with this AD, if any, may be 
obtained from the Los Angeles ACO.

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.

    Issued in Renton, Washington, on January 21, 2000.
Vi L. Lipski,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 00- 2003 Filed 1-31-00; 8:45 am]
BILLING CODE 4910-13-P