[Federal Register: January 7, 2005 (Volume 70, Number 5)]
[Rules and Regulations]
[Page 1336-1338]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr07ja05-7]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2004-18729; Directorate Identifier 2004-NM-24-AD;
Amendment 39-13931; AD 2005-01-07]
RIN 2120-AA64
Airworthiness Directives; Boeing Model 747-100 and -200B Series
Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
certain Boeing Model 747-100 and -200B series airplanes. This AD
requires installing bonding clips and bonding jumpers from the housing
of each fuel pump to airplane structure outside the fuel tanks. This AD
is prompted by the results of fuel system reviews conducted by the
manufacturer. We are issuing this AD to ensure adequate electrical
bonding between the housing of each fuel pump and airplane structure
outside the fuel tanks. Inadequate electrical bonding, in the event of
a lightning strike or pump electrical fault, could cause electrical
arcing and ignition of fuel vapor in the wing fuel tank, which could
result in a fuel tank explosion.
DATES: This AD becomes effective February 11, 2005.
The incorporation by reference of a certain publication listed in
the AD is approved by the Director of the Federal Register as of
February 11, 2005.
ADDRESSES: For service information identified in this AD, contact
Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124-
2207.
You can examine this information at the National Archives and
Records Administration (NARA). For information on the availability of
this material at NARA, call (202) 741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html
.
You can examine the contents of this AD docket on the Internet at
http://dms.dot.gov, or at the Docket Management Facility, U.S.
Department of Transportation, 400 Seventh Street SW., room PL-401, on
the plaza level of the Nassif Building, Washington, DC.
FOR FURTHER INFORMATION CONTACT:
Technical information: Dan Kinney, Aerospace Engineer, Propulsion
Branch, ANM-140S, FAA, Seattle Aircraft Certification Office, 1601 Lind
Avenue, SW., Renton, Washington 98055-4056; telephone (425) 917-6499;
fax (425) 917-6590.
Plain language information: Marcia Walters, marcia.walters@faa.gov.
Examining the Docket
The AD docket contains the proposed AD, comments, and any final
disposition. You can examine the AD docket on the Internet at http://dms.dot.gov
, or in person at the Docket Management Facility office
between 9 a.m. and 5 p.m., Monday through Friday, except Federal
holidays. The Docket Management Facility office (telephone (800) 647-
5227) is located on the plaza level of the Nassif Building at the DOT
street address stated in the ADDRESSES section.
SUPPLEMENTARY INFORMATION: The FAA proposed to amend 14 CFR part 39
with an AD for certain Boeing Model 747-100 and -200B series airplanes.
That action, published in the Federal Register on August 6, 2004 (69 FR
47814), proposed to require installing bonding clips and bonding
jumpers from the housing of each fuel pump to airplane structure
outside the fuel tanks.
Comments
We provided the public the opportunity to participate in the
development of this AD. We have considered the comments submitted on
the proposed AD.
[[Page 1337]]
Request To Revise Bonding Resistance Values
The commenters state that there is a discrepancy in Boeing Alert
Service Bulletin 747-28A2033, Revision 1, dated December 18, 2003. The
discrepancy is the different maximum allowable resistance values for
the boost pumps and the override jettison pumps. The resistance value
for the boost pumps is 0.0004 ohm. The resistance value for the
jettison pumps is 0.0002 ohm. One of the commenters notes that the same
bonding jumper is used for each type of pump. We infer that the
commenter requests that either of the resistance values be changed so
the values are the same for the boost and override jettison pumps. The
other commenter requests revising the proposed AD, or contacting the
manufacturer so the service bulletin can be revised to correct the
discrepancy.
The FAA does not agree that there is an error in the resistance
values stated in Boeing Alert Service Bulletin 747-28A2033, Revision 1.
The resistance values stated in the service bulletin are correct, and
are based upon possible fault current magnitudes, which are different
for the two pump types. This AD has not been changed regarding this
issue.
Conclusion
We have carefully reviewed the available data, including the
comments that have been submitted, and determined that air safety and
the public interest require adopting the AD as proposed.
Costs of Compliance
This AD affects about 158 airplanes worldwide. The following table
provides the estimated costs for U.S. operators to comply with this AD.
Estimated Costs
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Average Number of
Work labor Cost per U.S.- Fleet
Action hours rate per Parts airplane registered cost
hour airplanes
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Installation of Bonding Clips/Jumpers........ 8 $65 $0 $520 23 $11,960
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Authority for This Rulemaking
The FAA's authority to issue rules regarding aviation safety is
found in Title 49 of the United States Code. Subtitle I, section 106
describes the authority of the FAA Administrator. Subtitle VII,
Aviation Programs, describes in more detail the scope of the agency's
authority.
This rulemaking is promulgated under the authority described in
subtitle VII, part A, subpart III, section 44701, ``General
requirements.'' Under that section, the FAA is charged with promoting
safe flight of civil aircraft in air commerce by prescribing
regulations for practices, methods, and procedures the Administrator
finds necessary for safety in air commerce. This regulation is within
the scope of that authority because it addresses an unsafe condition
that is likely to exist or develop on products identified in this AD.
Regulatory Findings
We have determined that this AD will not have federalism
implications under Executive Order 13132. This AD will 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.
For the reasons discussed above, I certify that this AD:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866;
(2) Is not a ``significant rule'' under DOT Regulatory Policies and
Procedures (44 FR 11034, February 26, 1979); and
(3) 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.
We prepared a regulatory evaluation of the estimated costs to
comply with this AD. See the ADDRESSES section for a location to
examine the regulatory evaluation.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.
Adoption of the Amendment
0
Accordingly, under the authority delegated to me by the Administrator,
the FAA amends 14 CFR part 39 as follows:
PART 39--AIRWORTHINESS DIRECTIVES
0
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]
0
2. The FAA amends Sec. 39.13 by adding the following new airworthiness
directive (AD):
2005-01-07 Boeing: Amendment 39-13931. Docket No. FAA-2004-18729;
Directorate Identifier 2004-NM-24-AD.
Effective Date
(a) This AD becomes effective February 11, 2005.
Affected ADs
(b) None.
Applicability
(c) This AD applies to Boeing Model 747-100 and -200B series
airplanes having line numbers 1 through 167 inclusive, certificated
in any category.
Unsafe Condition
(d) This AD was prompted by the results of fuel system reviews
conducted by the manufacturer. We are issuing this AD to ensure
adequate electrical bonding between the housing of each fuel pump
and airplane structure outside the fuel tanks. Inadequate electrical
bonding, in the event of a lightning strike or pump electrical
fault, could cause electrical arcing and ignition of fuel vapor in
the wing fuel tank, which could result in a fuel tank explosion.
Compliance
(e) You are responsible for having the actions required by this
AD performed within the compliance times specified, unless the
actions have already been done.
Installation of Bonding Clips and Bonding Jumpers
(f) Within 60 months after the effective date of this AD,
install bonding clips and bonding jumpers from the housing of each
fuel pump to airplane structure located outside the fuel tanks by
doing all of the actions in part 1 of the Accomplishment
Instructions of Boeing Alert Service Bulletin 747-28A2033, Revision
1, dated December 18, 2003.
Actions Done in Accordance With Previous Issue of Service Bulletin
(g) Installations done before the effective date of this AD in
accordance with Boeing Service Bulletin 747-28-2033, dated December
15, 1971, are acceptable for compliance with the requirements of
this AD.
[[Page 1338]]
Alternative Methods of Compliance (AMOCs)
(h) The Manager, Seattle Aircraft Certification Office, FAA, has
the authority to approve AMOCs for this AD, if requested in
accordance with the procedures found in 14 CFR 39.19.
Material Incorporated by Reference
(i) You must use Boeing Alert Service Bulletin 747-28A2033,
Revision 1, dated December 18, 2003, to perform the actions that are
required by this AD, unless the AD specifies otherwise. The Director
of the Federal Register approves the incorporation by reference of
this document in accordance with 5 U.S.C. 552(a) and 1 CFR part 51.
For copies of the service information, contact Boeing Commercial
Airplanes, P.O. Box 3707, Seattle, Washington 98124-2207.
For information on the availability of this material at the
National Archives and Records Administration (NARA), call (202) 741-
6030, or go to http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.
You may view the AD docket
at the Docket Management Facility, U.S. Department of
Transportation, 400 Seventh Street SW., Room PL-401, Nassif
Building, Washington, DC.
Issued in Renton, Washington, on December 27, 2004.
Kevin M. Mullin,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 05-162 Filed 1-6-05; 8:45 am]
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