[Federal Register Volume 66, Number 194 (Friday, October 5, 2001)]
[Proposed Rules]
[Pages 50880-50882]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 01-25059]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 2001-NM-64-AD]
RIN 2120-AA64


Airworthiness Directives; McDonnell Douglas Model MD-11 and -11F 
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 and -11F series airplanes. This proposal would require replacing 
the wire harness support bracket of the integrated drive generator 
(IDG) of the forward engine mounts with a new support bracket, and 
modifying the angle of the bracket near the oil filter. This action is 
necessary to prevent arcing of the IDG wire harness, which could result 
in smoke and/or fire in the area of the forward engine mount bolt 
retainer and/or fire detector responder. 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-64-AD, 1601 Lind Avenue, SW., 
Renton, Washington 98055-4056. Comments may be inspected at this 
location between 9 a.m. and 3 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-64-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; 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-64-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-64-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 the wire harness of the 
integrated drive generator (IDG) chafing against the bolt retainer of 
the forward engine mount and/or the fire detector responder. This 
incident occurred on a McDonnell Douglas Model MD-11 series airplane, 
equipped with certain United Technologies Pratt & Whitney engines. 
Investigation revealed inadequate clearance between the IDG wire 
harness and the bolt retainer of the forward engine mount and/or fire 
detector responder. This condition, if not corrected, could cause 
arcing of the IDG wire harness, which could result in smoke and/or fire 
in the area of the forward engine mount bolt retainer and/or fire 
detector responder.
    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 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.

[[Page 50881]]

Explanation of Relevant Service Information

    The FAA has reviewed and approved Boeing Alert Service Bulletin 
MD11-71A086, Revision 01, dated May 21, 2001, which describes 
procedures for replacing the wire harness support bracket of the IDG of 
the forward engine mounts with a new support bracket, and modifying the 
angle of the bracket near the oil filter. The modification includes 
cutting and grinding the flanges, deburring the edges, fusion welding 
the flanges, and reidentifying the bracket. Accomplishment of the 
actions specified in the service bulletin is intended to adequately 
address the identified unsafe condition.
    Boeing Alert Service Bulletin MD11-71A086 references United 
Technologies Pratt & Whitney Service Bulletin PW4MD11 71-107, dated May 
15, 1996, as an additional source of service information for 
accomplishing the replacement and modification.

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 
Boeing Alert Service Bulletin MD11-71A086 described previously.

Cost Impact

    There are approximately 195 Model MD-11 and -11F series airplanes 
of the affected design in the worldwide fleet. The FAA estimates that 
67 airplanes of U.S. registry would be affected by this proposed AD, 
that it would take approximately 3 work hours per airplane to 
accomplish the proposed actions, and that the average labor rate is $60 
per work hour. Required parts would be provided by the engine 
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 
$12,060, or $180 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-64-AD.

    Applicability: Model MD-11 and ``11F series airplanes, 
certificated in any category; equipped with United Technologies 
Pratt & Whitney Model PW4460 or PW4462 engines, engine buildup unit 
having neutral quick engine change, cum units 4 through 240 
inclusive and serial numbers 5166001 through 5213003 inclusive.

    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 (c) 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 arcing of the integrated drive generator (IDG) wire 
harness, which could result in smoke and/or fire in the area of the 
forward engine mount bolt retainer and/or fire detector responder, 
accomplish the following:

Replacement and Modification

    (a) Within 1 year after the effective date of this AD, replace 
the wire harness support bracket of the IDG of the forward engine 
mounts with a new support bracket, and modify the angle of the 
bracket near the oil filter (i.e., cut and grind flanges, deburr 
edges, fusion weld flanges, and reidentify bracket), per Boeing 
Alert Service Bulletin MD11-71A086, Revision 01, dated May 21, 2001.

    Note 2: Boeing Alert Service Bulletin MD11-71A086 references 
United Technologies Pratt & Whitney Service Bulletin PW4MD11 71-107, 
dated May 15, 1996, as an additional source of service information 
for accomplishing the proposed replacement and modification.

Spares

    (b) As of the effective date of this AD, no United Technologies 
Pratt & Whitney Model PW4460 or PW4462 engines, engine buildup unit 
having neutral quick engine change, cum units 4 through 240 
inclusive and serial numbers 5166001 through 5213003 inclusive, 
shall be installed on any airplane unless the requirements of 
paragraph (a) of this AD have been done.

Alternative Methods of Compliance

    (c) 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.

    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 Permit

    (d) 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.


[[Page 50882]]


    Issued in Renton, Washington, on October 1, 2001.
Charles Huber,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 01-25059 Filed 10-4-01; 8:45 am]
BILLING CODE 4910-13-P