[Federal Register: May 27, 2004 (Volume 69, Number 103)]
[Proposed Rules]
[Page 30245-30248]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr27my04-26]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 2003-NM-69-AD]
RIN 2120-AA64
Airworthiness Directives; McDonnell Douglas Model MD-11 and -11F
Airplanes
AGENCY: Federal Aviation Administration, DOT.
[[Page 30246]]
ACTION: Notice of proposed rulemaking (NPRM).
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SUMMARY: This document proposes the supersedure of an existing
airworthiness directive (AD), applicable to certain McDonnell Douglas
Model MD-11 and MD-11F airplanes, that currently requires replacing
terminal strips and supports above the main cabin area and avionics
compartment with new strips and supports, as applicable. That AD also
requires performing an inspection to detect arcing damage of the
surrounding structure of the terminal strips and electrical cables in
the avionics compartment, and repairing or replacing any damaged
component with a new component. This action would expand the
applicability of the existing AD to include additional airplanes. For
certain airplanes, this action also would require replacement of the
terminal board for the applicable item numbers in the aft passenger
compartment. The actions specified by the proposed AD are intended to
prevent electrical arcing caused by power feeder cable terminal lugs
grounding against terminal strip support brackets, which could result
in smoke and fire in the main cabin or avionics compartment. This
action is intended to address the identified unsafe condition.
DATES: Comments must be received by July 12, 2004.
ADDRESSES: Submit comments in triplicate to the Federal Aviation
Administration (FAA), Transport Airplane Directorate, ANM-114,
Attention: Rules Docket No. 2003-NM-69-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:
9-anm-nprmcomment@faa.gov. Comments sent via fax or the Internet must
contain ``Docket No. 2003-NM-69-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 or 2000 or
ASCII text.
The service information referenced in the proposed rule may be
obtained from Boeing Commercial Airplanes, 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 2003-NM-69-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. 2003-NM-69-AD, 1601 Lind Avenue, SW., Renton, Washington
98055-4056.
Discussion
On August 23, 2002, the FAA issued AD 2002-14-09, amendment 39-
12809 (67 FR 47647, July 19, 2002), applicable to certain McDonnell
Douglas Model MD-11 and -11F airplanes, to require replacing terminal
strips and supports above the main cabin area and avionics compartment
with new strips and supports, as applicable. That AD also requires
performing an inspection to detect arcing damage of the surrounding
structure of the terminal strips and electrical cables in the avionics
compartment, and repairing or replacing any damaged component with a
new component. That action was prompted by reports of arcing between
the power feeder cables and support brackets of the terminal strips on
airplanes previously modified per the existing AD. The requirements of
that AD are intended to prevent electrical arcing caused by power
feeder cable terminal lugs grounding against terminal strip support
brackets, which could result in smoke and fire in the main cabin or
avionics compartment.
Actions Since Issuance of Previous Rule
Since the issuance of that AD, the airplane manufacturer has
informed the FAA that it inadvertently omitted airplanes having
manufacturer's fuselage number (MSN) 0585 through 0605 inclusive from
the effectivity listing of McDonnell Douglas Alert Service Bulletin
MD11-24A178, Revision 01, dated December 17, 2001 (which was referenced
in AD 2002-14-09 as an appropriate source of service information for
accomplishing the required actions). We have determined that these
additional airplanes are subject to the unsafe condition identified in
that AD.
In addition, after consulting with the airplane manufacturer, we
have determined that the replacement required by paragraph (a) of AD
2002-14-09 (reference McDonnell Douglas Alert Service Bulletin MD11-
24A150, dated March 25, 1999) does not adequately preclude arcing
between the power feeder cables and terminal strip support brackets.
That action replaced one problematic terminal strip in the main cabin
with two three-studded terminal strips in one location (applicable to
airplanes having manufacturer's fuselage numbers 0585 and subsequent).
The airplane manufacturer has developed a six-studded terminal strip
that provides increased clearance to further minimize the possibility
of chafing. This new,
[[Page 30247]]
improved terminal strip would replace all three-studded terminal strips
in certain locations of the main cabin. Because the six-studded
terminal strips were not installed on airplanes during production,
additional airplanes beyond those with three-studded terminal strips
are subject to this new replacement.
Explanation of Relevant Service Information
We have reviewed and approved Revision 02 of Boeing Alert Service
Bulletin MD11-24A178, dated March 11, 2003, which revises the
effectivity of Revision 01 of the service bulletin by adding 21
additional manufacturer's serial numbers (MSN). The replacement,
inspection, and corrective actions if necessary, specified in Revision
02 are essentially identical to those described in Revision 01 of the
service bulletin.
We have also reviewed and approved McDonnell Douglas Alert Service
Bulletin MD11-24A177, dated July 18, 2003, and have reviewed Boeing
Service Bulletin Information Notice MD11-24A177 IN 01, dated August 7,
2003. The service bulletin describes procedures for replacement of the
terminal board for the applicable item numbers in the aft passenger
compartment. The information notice revises service kits numbers
specified in paragraph 2.B., ``Post-Warranty'' of this service
bulletin.
Accomplishment of the actions specified in the applicable service
bulletins 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 supersede AD 2002-14-09 to continue to require
replacement of terminal strips in the avionics compartment with new
strips. The proposed AD also would continue to require an inspection to
detect arcing damage of the surrounding structure of the terminal
strips and electrical cables in the avionics compartment, and repair or
replacement of any damaged component with a new component. In addition,
the proposed AD would expand the applicability of the existing AD to
include additional airplanes. For certain airplanes, the proposed AD
also would require accomplishment of the actions specified in McDonnell
Douglas Alert Service Bulletin MD11-24A177 described previously; except
as discussed below.
Differences Between Proposed AD and Service Bulletin
Operators should note that Revision 02 of Boeing Alert Service
Bulletin MD11-24A178 specifies to repair damaged structure per the
Structural Repair Manual (SRM). However, the SRM does not provide
procedures for repair of certain structural material. Therefore, this
proposed AD would require the repair of damaged structure that is not
covered in the SRM to be done per a method approved by us.
Model MD-11F airplanes are not specifically identified by model
name in the effectivity of Revision 02 of Boeing Alert Service Bulletin
MD11-24A178 or McDonnell Douglas Alert Service Bulletin MD11-24A177.
However, those airplanes are identified by manufacturer's fuselage
numbers. Therefore, the applicability of this proposed AD specifies
both MD-11 and -11F airplanes.
Although Revision 02 of Boeing Alert Service Bulletin MD11-24A178
describes procedures for reporting inspection findings to the airplane
manufacturer, this proposed AD would not require that action.
Changes to Requirements of Existing AD/Effect on the Proposed AD
Since the language in Note 3 of AD 2002-14-09 is regulatory in
nature, that note has been redesignated as paragraph (b) of this
proposed AD.
We have reviewed the figures we have used over the past several
years to calculate AD costs to operators. To account for various
inflationary costs in the airline industry, we find it necessary to
increase the labor rate used in these calculations from $60 per work
hour to $65 per work hour. The cost impact information, below, reflects
this increase in the specified hourly labor rate.
Cost Impact
There are approximately 154 airplanes of the affected design in the
worldwide fleet listed in Boeing Alert Service Bulletin MD11-24A178.
The FAA estimates that 61 airplanes of U.S. registry would be affected
by this proposed AD. The cost estimate for those airplanes is as
follows:
1. The actions that are currently required by AD 2002-14-09 and
retained in this proposed take approximately 3 or 4 work hours per
airplane (depending on airplane configuration) to accomplish, at an
average labor rate of $65 per work hour. Required parts cost
approximately $1,142 per airplane. Based on these figures, the cost
impact of the currently required actions on U.S. operators is estimated
to be $1,337 or $1,420 per airplane (depending on airplane
configuration).
2. For Group 3 and 4 airplanes identified in Boeing Alert Service
Bulletin MD11-24A178, the new actions that are proposed in this AD
action would take approximately 4 (kit/part number SA11240178-3) or 5
(kit/part number SA11240178-5) work hours per airplane to accomplish,
at an average labor rate of $65 per work hour. Required parts would
cost approximately $3,031 (kit/part number SA11240178-3) or $617 per
airplane (kit/part number SA11240178-5). Based on these figures, the
cost impact of these new proposed requirements of this AD on U.S.
operators is estimated to be $3,291 (kit/part number SA11240178-3) or
$942 (kit/part number SA11240178-5) per airplane.
There are approximately 103 airplanes of the affected design in the
worldwide fleet listed in McDonnell Douglas Alert Service Bulletin
MD11-24A177. The FAA estimates that 33 airplanes of U.S. registry would
be affected by this proposed AD.
For airplanes identified in Boeing Alert Service Bulletin MD11-
24A177, the new replacement that is proposed in this AD action would
take approximately between 1 and 3 work hours per airplane to
accomplish, at an average labor rate of $65 per work hour. Required
parts would cost approximately between $114 and $876 per airplane.
Based on these figures, the cost impact of the new proposed replacement
requirements of this AD on U.S. operators is estimated to be between
$5,907 and $35,343, or between $179 and $1,071 per airplane.
The cost impact figures discussed above are based on assumptions
that no operator has yet accomplished any of the current or proposed
requirements of this AD action, and that no operator would accomplish
those actions in the future if this 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. The manufacturer may
cover the cost of replacement parts associated with this proposed AD,
subject to warranty conditions. Manufacturer warranty remedies may also
be available for labor costs associated with this proposed AD. As a
result, the costs attributable to the
[[Page 30248]]
proposed AD may be less than stated above.
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 removing amendment 39-12809 (67 FR
47647, July 19, 2002), and by adding a new airworthiness directive
(AD), to read as follows:
McDonnell Douglas: Docket 2003-NM-69-AD. Supersedes AD 2002-14-09,
Amendment 39-12809.
Applicability: Model MD-11 and -11F airplanes, as listed in
Boeing Alert Service Bulletin MD11-24A178, Revision 02, dated March
11, 2003, and McDonnell Douglas Alert Service Bulletin MD11-24A177,
dated July 18, 2003; certificated in any category.
Compliance: Required as indicated, unless accomplished
previously.
To prevent electrical arcing caused by power feeder cable
terminal lugs grounding against terminal strip support brackets,
which could result in smoke and fire in the main cabin or avionics
compartment, accomplish the following:
Certain Requirements of AD 2002-14-09, Amendment 39-12809
Replacement, Inspection, and Corrective Action if Necessary
(a) For airplanes listed in the effectivity of McDonnell Douglas
Alert Service Bulletin MD11-24A178, Revision 01, dated December 17,
2001: Within 18 months after August 23, 2002 (the effective date AD
2002-14-09, amendment 39-12809), do the actions specified in
paragraphs (a)(1) and (a)(2) of this AD per the service bulletin.
(1) Replace the applicable terminal strips in the avionics
compartment with new terminal strips (including inspecting wires for
damage, repairing any damaged wire, and removing the nameplate); and
(2) Perform a general visual inspection to detect arcing damage
of the surrounding structure of the terminal strips and electrical
cables in the avionics compartment. If any damage is detected,
before further flight, repair or replace any damaged component with
a new component, per the service bulletin; except if the type of
structural material of the surrounding structure that has been
affected is not covered in the Structural Repair Manual, repair per
a method approved by the Manager, Los Angeles Aircraft Certification
Office (ACO), FAA.
Note 1: 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.''
(b) Accomplishment of the replacement, inspection, and
corrective action, before the effective date of this AD, per
McDonnell Douglas Alert Service Bulletin MD11-24A178, dated May 14,
2001, is considered acceptable for compliance with the applicable
actions specified in paragraph (a) of this AD.
New Requirements of This AD
Replacement, Inspection, and Corrective Action if Necessary
(c) For Groups 3 and 4 airplanes listed in the effectivity of
Boeing Alert Service Bulletin MD11-24A178, Revision 02, dated March
11, 2003: Within 18 months after the effective date of this AD, do
the actions specified in paragraphs (c)(1) and (c)(2) of this AD per
the Accomplishment Instructions of the service bulletin. Although
the service bulletin specifies to report inspection findings to the
airplane manufacturer, this AD does not include such a requirement.
(1) Replace the applicable terminal strips in the avionics
compartment with new terminal strips (including inspecting wires for
damage, repairing any damaged wire, and removing the nameplate); and
(2) Perform a general visual inspection to detect arcing damage
of the surrounding structure of the terminal strips and electrical
cables in the avionics compartment. If any damage is detected,
before further flight, repair or replace any damaged component with
a new component, per the service bulletin; except if the type of
structural material of the surrounding structure that has been
affected is not covered in the Structural Repair Manual, repair per
a method approved by the Manager, Los Angeles ACO, FAA.
(d) For airplanes listed in McDonnell Douglas Alert Service
Bulletin MD11-24A177, dated July 18, 2003: Within 18 months after
the effective date of this AD, replace the terminal board for the
applicable item numbers in the aft passenger compartment, per the
Accomplishment Instructions of the service bulletin.
Note 2: Boeing Service Bulletin Information Notice MD11-24A177
IN 01, dated August 7, 2003, revises service kits numbers specified
in paragraph 2.B., ``Post-Warranty'' of McDonnell Douglas Alert
Service Bulletin MD11-24A177, dated July 18, 2003.
Alternative Methods of Compliance
(e)(1) In accordance with 14 CFR 39.19, the Manager, Los Angeles
ACO, FAA, is authorized to approve alternative methods of compliance
for this AD.
(2) Alternative methods of compliance, approved previously per
AD 2002-14-09, amendment 39-12809, are approved as alternative
methods of compliance with paragraph (a) of this AD.
Issued in Renton, Washington, on May 18, 2004.
Kevin M. Mullin,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 04-11960 Filed 5-26-04; 8:45 am]
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