[Federal Register Volume 66, Number 194 (Friday, October 5, 2001)]
[Proposed Rules]
[Pages 50870-50872]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 01-25064]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 2001-NM-160-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 an inspection to 
detect chafed wires in the avionics equipment compartment, and repair, 
if necessary. The proposal also would require replacement of the 
existing cover of the avionics cooling fan with a new cover, and 
installation of a new placard on the cover. This action is necessary to 
ensure that the cover of the avionics cooling fans is removed only for 
fan maintenance, and to prevent smoke and/or fire in the avionics 
equipment compartment due to chafing and arcing as a result of 
maintenance personnel lying against the removed cover and/or insulation 
blankets that cover wire harnesses. This action is intended to address 
the identified unsafe condition.

DATES: Comments must be received by November 19, 2001.

ADDRESSES: Submit comments in triplicate to the Federal Aviation 
Administration (FAA), Transport Airplane Directorate, ANM-114, 
Attention: Rules Docket No. 2001-NM-160-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. Comments may be submitted via fax to (425) 227-1232. 
Comments may also be sent via the Internet using the following address: 
[email protected]. Comments sent via fax or the Internet must 
contain ``Docket No. 2001-NM-160-AD'' in the subject line and need not 
be submitted in triplicate. Comments sent via the Internet as attached 
electronic files must be formatted in Microsoft Word 97 for Windows or 
ASCII text.
    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: Data 
and Service Management, Dept. C1-L5A (D800-0024). This information may 
be examined at the FAA, Transport Airplane Directorate, 1601 Lind 
Avenue, SW., Renton, Washington; or at the FAA, 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, 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 action may be changed in 
light of the comments received.
    Submit comments using the following format:
     Organize comments issue-by-issue. For example, discuss a 
request to change the compliance time and a request to change the 
service bulletin reference as two separate issues.
     For each issue, state what specific change to the proposed 
AD is being requested.
     Include justification (e.g., reasons or data) for each 
request.
    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 action must submit a self-addressed, 
stamped postcard on which the following statement is made: ``Comments 
to Docket Number 2001-NM-160-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. 2001-NM-160-AD, 1601 Lind Avenue, SW., Renton, Washington 
98055-4056.

Discussion

    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 incident of a chafing condition between the 
wire harness and No. 2 wire harness connector, which resulted in arcing 
and consequent fire in the avionics equipment compartment during 
maintenance of a McDonnell Douglas Model MD-11 series airplane. This 
condition has been attributed to maintenance personnel removing the 
cover of the avionics cooling fans to access other equipment more 
easily and lying against the cover and/or insulation blankets that 
cover the wire harness of the No. 3 avionics cooling fan and the No. 2 
wire harness connector. This action, plus the weight of the maintenance 
personnel lying against the cover or insulation blankets, resulted in 
the chafing of the wiring. These conditions, if not corrected, could 
result in smoke and/or fire in the avionics equipment compartment.
    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

[[Page 50871]]

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 Boeing Alert Service Bulletin 
MD11-21A033, Revision 01, dated April 30, 2001, which describes 
procedures for an inspection to detect chafed wires in the avionics 
equipment compartment, and repair, if necessary. It also describes 
procedures for replacement of the existing cover of the avionics 
cooling fan with a new, strengthened cover, and installation of a new 
placard on the cover stating that the cover should be removed only for 
fan maintenance. 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, the 
proposed AD would require accomplishment of the actions specified in 
the service bulletin described previously.

Cost Impact

    There are approximately 80 Model MD-11 series airplanes of the 
affected design in the worldwide fleet. The FAA estimates that 33 
airplanes of U.S. registry would be affected by this proposed AD, that 
it would take approximately 4 work hours per airplane to accomplish the 
proposed actions, and that the average labor rate is $60 per work hour. 
Required parts would cost approximately $1,991 per airplane. Based on 
these figures, the cost impact of the proposed AD on U.S. operators is 
estimated to be $73,623, or $2,231 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 proposed AD were not adopted. The cost impact 
figures discussed in AD rulemaking actions represent only the time 
necessary to perform the specific actions actually required by the AD. 
These figures typically do not include incidental costs, such as the 
time required to gain access and close up, planning time, or time 
necessitated by other administrative actions.

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 2001-NM-160-AD.

    Applicability: Model MD-11 series airplanes, as listed in Boeing 
Alert Service Bulletin MD11-21A033, Revision 01, dated April 30, 
2001; 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 (d) 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 ensure that the cover of the avionics cooling fans is removed 
only during fan maintenance, and to prevent smoke and/or fire in the 
avionics equipment compartment due to chafing and arcing as a result 
of maintenance personnel lying against a removed cover and/or 
insulation blankets that cover wire harnesses, accomplish the 
following:

Inspection and Repair, If Necessary

    (a) Within 18 months after the effective date of this AD, do a 
general visual inspection to detect chafed wires in the area of the 
avionics cooling fans inside the avionics equipment compartment, per 
Boeing Alert Service Bulletin MD11-21A033, Revision 01, dated April 
30, 2001. If any chafed wiring is detected, before further flight, 
repair per the service bulletin.

    Note 2: For the purposes of this AD, a general visual inspection 
is defined as ``A visual examination of an interior or exterior 
area, installation, or assembly to detect obvious damage, failure, 
or irregularity. This level of inspection is made under normally 
available lighting conditions such as daylight, hangar lighting, 
flashlight, or drop-light, and may require removal or opening of 
access panels or doors. Stands, ladders, or platforms may be 
required to gain proximity to the area being checked.''

Replacement of A Cover and Installation of a New Placard

    (b) Within 18 months after the effective date of this AD, 
replace the existing cover of the avionics cooling fan with a new 
cover, and install a new placard on the cover, per Boeing Alert 
Service Bulletin MD11-21A033, Revision 01, dated April 30, 2001.

    Note 3: Accomplishment of the actions specified in McDonnell 
Douglas Service Bulletin MD11-21-033, dated May 1, 1992, before the 
effective date of this AD, is considered acceptable for compliance 
with the requirements of this AD.

Spares

    (c) As of the effective date of this AD, no person shall install 
a cover assembly, part number ABM7569-1, on any airplane.

Alternative Methods of Compliance

    (d) 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. 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.


[[Page 50872]]


    Note 4: 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 Permit

    (e) 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 October 1, 2001.
Charles Huber,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.

[FR Doc. 01-25064 Filed 10-4-01; 8:45 am]
BILLING CODE 4910-13-P