Airworthiness Directives; Boeing Model 737-600, -700, -700C, -800, and -900 Series Airplanes, 26423-26425 [E6-6795]
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26423
Proposed Rules
Federal Register
Vol. 71, No. 87
Friday, May 5, 2006
This section of the FEDERAL REGISTER
contains notices to the public of the proposed
issuance of rules and regulations. The
purpose of these notices is to give interested
persons an opportunity to participate in the
rule making prior to the adoption of the final
rules.
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA–2006–24691; Directorate
Identifier 2006–NM–051–AD]
RIN 2120–AA64
Airworthiness Directives; Boeing
Model 737–600, –700, –700C, –800, and
–900 Series Airplanes
Federal Aviation
Administration (FAA), Department of
Transportation (DOT).
ACTION: Notice of proposed rulemaking
(NPRM).
cprice-sewell on PROD1PC66 with PROPOSALS
AGENCY:
SUMMARY: The FAA proposes to adopt a
new airworthiness directive (AD) for
certain Boeing Model 737–600, –700,
–700C, –800, and –900 series airplanes.
This proposed AD would require testing
the electrical resistance of the bond
between the bulkhead fitting for the fuel
feed line and the front spar of the left
and right wings, inspecting an adjacent
bonding jumper to make sure it is
installed correctly, and performing
corrective and other specified actions as
applicable. This proposed AD results
from fuel system reviews conducted by
the manufacturer. We are proposing this
AD to prevent arcing or sparking in the
fuel tank in the event of a lightning
strike, which could result in an
uncontrolled fire or explosion.
DATES: We must receive comments on
this proposed AD by June 19, 2006.
ADDRESSES: Use one of the following
addresses to submit comments on this
proposed AD.
• DOT Docket Web site: Go to
https://dms.dot.gov and follow the
instructions for sending your comments
electronically.
• Government-wide rulemaking Web
site: Go to https://www.regulations.gov
and follow the instructions for sending
your comments electronically.
• Mail: Docket Management Facility,
U.S. Department of Transportation, 400
VerDate Aug<31>2005
14:37 May 04, 2006
Jkt 208001
Seventh Street, SW., Nassif Building,
Room PL–401, Washington, DC 20590.
• Fax: (202) 493–2251.
• Hand Delivery: Room PL–401 on
the plaza level of the Nassif Building,
400 Seventh Street, SW., Washington,
DC, between 9 a.m. and 5 p.m., Monday
through Friday, except Federal holidays.
Contact Boeing Commercial
Airplanes, P.O. Box 3707, Seattle,
Washington 98124–2207, for the service
information identified in this proposed
AD.
FOR FURTHER INFORMATION CONTACT:
Doug Pegors, Aerospace Engineer,
Propulsion Branch, ANM–140S, FAA,
Seattle Aircraft Certification Office,
1601 Lind Avenue, SW., Renton,
Washington 98055–4056; telephone
(425) 917–6504; fax (425) 917–6590.
SUPPLEMENTARY INFORMATION:
Comments Invited
We invite you to submit any relevant
written data, views, or arguments
regarding this proposed AD. Send your
comments to an address listed in the
ADDRESSES section. Include the docket
number ‘‘FAA–2006–24691; Directorate
Identifier 2006–NM–051–AD’’ at the
beginning of your comments. We
specifically invite comments on the
overall regulatory, economic,
environmental, and energy aspects of
the proposed AD. We will consider all
comments received by the closing date
and may amend the proposed AD in
light of those comments.
We will post all comments we
receive, without change, to https://
dms.dot.gov, including any personal
information you provide. We will also
post a report summarizing each
substantive verbal contact with FAA
personnel concerning this proposed AD.
Using the search function of that Web
site, anyone can find and read the
comments in any of our dockets,
including the name of the individual
who sent the comment (or signed the
comment on behalf of an association,
business, labor union, etc.). You may
review DOT’s complete Privacy Act
Statement in the Federal Register
published on April 11, 2000 (65 FR
19477–78), or you may visit https://
dms.dot.gov.
Examining the Docket
You may examine the AD docket on
the Internet at https://dms.dot.gov, or in
person at the Docket Management
PO 00000
Frm 00001
Fmt 4702
Sfmt 4702
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. Comments will be available in
the AD docket shortly after the Docket
Management System receives them.
Discussion
The FAA has examined the
underlying safety issues involved in fuel
tank explosions on several large
transport airplanes, including the
adequacy of existing regulations, the
service history of airplanes subject to
those regulations, and existing
maintenance practices for fuel tank
systems. As a result of those findings,
we issued a regulation titled ‘‘Transport
Airplane Fuel Tank System Design
Review, Flammability Reduction and
Maintenance and Inspection
Requirements’’ (67 FR 23086, May 7,
2001). In addition to new airworthiness
standards for transport airplanes and
new maintenance requirements, this
rule included Special Federal Aviation
Regulation No. 88 (‘‘SFAR 88,’’
Amendment 21–78, and subsequent
Amendments 21–82 and 21–83).
Among other actions, SFAR 88
requires certain type design (i.e., type
certificate (TC) and supplemental type
certificate (STC)) holders to substantiate
that their fuel tank systems can prevent
ignition sources in the fuel tanks. This
requirement applies to type design
holders for large turbine-powered
transport airplanes and for subsequent
modifications to those airplanes. It
requires them to perform design reviews
and to develop design changes and
maintenance procedures if their designs
do not meet the new fuel tank safety
standards. As explained in the preamble
to the rule, we intended to adopt
airworthiness directives to mandate any
changes found necessary to address
unsafe conditions identified as a result
of these reviews.
In evaluating these design reviews, we
have established four criteria intended
to define the unsafe conditions
associated with fuel tank systems that
require corrective actions. The
percentage of operating time during
which fuel tanks are exposed to
flammable conditions is one of these
criteria. The other three criteria address
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26424
Federal Register / Vol. 71, No. 87 / Friday, May 5, 2006 / Proposed Rules
cprice-sewell on PROD1PC66 with PROPOSALS
the failure types under evaluation:
Single failures, single failures in
combination with a latent condition(s),
and in-service failure experience. For all
four criteria, the evaluations included
consideration of previous actions taken
that may mitigate the need for further
action.
We have determined that the actions
identified in this AD are necessary to
reduce the potential of ignition sources
inside fuel tanks, which, in combination
with flammable fuel vapors, could result
in fuel tank explosions and consequent
loss of the airplane.
We have received a report indicating
that, during production of certain
Boeing Model 737–600, –700, –700C,
–800, and –900 series airplanes, the
electrical bond between the bulkhead
fitting for the fuel feed line and the wing
front spar was not adequately tested to
verify that the bond meets the required
resistance. Testing of the electrical
bond, and the application of sealant, is
intended to prevent ignition sources
from entering the fuel tank in the event
of a lightning strike. Arcing or sparking
in the fuel tank could result in an
uncontrolled fire or explosion.
Relevant Service Information
We have reviewed Boeing Special
Attention Service Bulletin 737–28–
1225, dated January 12, 2006. The
service bulletin describes procedures for
testing the electrical resistance of the
bond between the bulkhead fitting for
the fuel feed line and the front spar on
the left and right wings, performing a
general visual inspection of adjacent
bonding jumpers to make sure they are
installed correctly, and performing
corrective actions as applicable.
Regardless of the findings of the
resistance test, the service bulletin
details other specified actions that entail
applying sealant to the aft side of the
bulkhead fitting to encapsulate the
fitting and the fuel feed tube coupling.
If the electrical resistance test results
in a value that is outside the limits
identified in the service bulletin, the
service bulletin specifies corrective
actions including repairing the bond
and retesting to verify adequate
electrical resistance.
If the bonding jumper is not installed
correctly, the corrective action is
reinstalling the jumper correctly.
Accomplishing the actions specified
in the service information is intended to
adequately address the unsafe
condition.
FAA’s Determination and Requirements
of the Proposed AD
We have evaluated all pertinent
information and identified an unsafe
VerDate Aug<31>2005
14:37 May 04, 2006
Jkt 208001
condition that is likely to exist or
develop on other airplanes of this same
type design. For this reason, we are
proposing this AD, which would require
accomplishing the actions specified in
the service information described
previously.
Costs of Compliance
There are about 1,541 airplanes of the
affected design in the worldwide fleet.
This proposed AD would affect about
591 airplanes of U.S. registry. The
proposed actions would take about 4
work hours per airplane, at an average
labor rate of $80 per work hour. Based
on these figures, the estimated cost of
the proposed AD for U.S. operators is
$189,120, or $320 per airplane.
Authority for This Rulemaking
Title 49 of the United States Code
specifies the FAA’s authority to issue
rules on aviation safety. 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.
We are issuing this rulemaking under
the authority described in subtitle VII,
part A, subpart III, section 44701,
‘‘General requirements.’’ Under that
section, Congress charges the FAA 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 rulemaking
action.
Regulatory Findings
We have determined that this
proposed AD would not have federalism
implications under Executive Order
13132. This proposed AD 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.
For the reasons discussed above, I
certify that the 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. 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.
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Frm 00002
Fmt 4702
Sfmt 4702
We prepared a regulatory evaluation
of the estimated costs to comply with
this proposed AD and placed it in the
AD docket. 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, Safety.
The Proposed Amendment
Accordingly, under the authority
delegated to me by the Administrator,
the FAA proposes to amend 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.
§ 39.13
[Amended]
2. The Federal Aviation
Administration (FAA) amends § 39.13
by adding the following new
airworthiness directive (AD):
Boeing: Docket No. FAA–2006–24691;
Directorate Identifier 2006–NM–051–AD.
Comments Due Date
(a) The FAA must receive comments on
this AD action by June 19, 2006.
Affected ADs
(b) None.
Applicability
(c) This AD applies to Boeing Model 737–
600, –700, –700C, –800, and –900 series
airplanes, certificated in any category, as
identified in Boeing Special Attention
Service Bulletin 737–28–1225, dated January
12, 2006.
Unsafe Condition
(d) This AD results from fuel system
reviews conducted by the manufacturer. We
are issuing this AD to prevent arcing or
sparking in the fuel tank in the event of a
lightning strike, which could result in an
uncontrolled fire or 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.
Test, Inspection, and Corrective and Other
Specified Actions
(f) Within 60 months after the effective
date of this AD, test the electrical resistance
of the bond between the bulkhead fitting for
the fuel feed line and the wing front spar on
the left and right wings, do a general visual
inspection of adjacent bonding jumpers to
make sure they are installed correctly, and do
all applicable corrective and other specified
actions by doing all of the actions specified
in the Accomplishment Instructions of
Boeing Special Attention Service Bulletin
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Federal Register / Vol. 71, No. 87 / Friday, May 5, 2006 / Proposed Rules
737–28–1225, dated January 12, 2006. All
applicable corrective actions and other
specified actions must be done before further
flight after the electrical resistance test.
Alternative Methods of Compliance
(AMOCs)
(g)(1) The Manager, Seattle Aircraft
Certification Office (ACO), FAA, has the
authority to approve AMOCs for this AD, if
requested in accordance with the procedures
found in 14 CFR 39.19.
(2) Before using any AMOC approved in
accordance with § 39.19 on any airplane to
which the AMOC applies, notify the
appropriate principal inspector in the FAA
Flight Standards Certificate Holding District
Office.
Issued in Renton, Washington, on April 28,
2006.
Ali Bahrami,
Manager, Transport Airplane Directorate,
Aircraft Certification Service.
[FR Doc. E6–6795 Filed 5–4–06; 8:45 am]
BILLING CODE 4910–13–P
DEPARTMENT OF TRANSPORTATION
Office of the Secretary
14 CFR Parts 204 and 399
[Docket No. OST–2003–15759]
RIN 2105–AD25
Actual Control of U.S. Air Carriers
Office of the Secretary, DOT.
Supplemental notice of
proposed rulemaking.
AGENCY:
cprice-sewell on PROD1PC66 with PROPOSALS
ACTION:
SUMMARY: The Department is seeking
additional comments on our proposal to
clarify policies that it may use to
evaluate air carriers’ citizenship during
initial and continuing fitness reviews.
Our proposal would affect how we
determine ‘‘actual control’’ of the carrier
in situations where the foreign
investor’s home country has an open
skies air services agreement with the
United States, and permits reciprocal
investment opportunities in its own
national air carriers for U.S. investors.
We continue to believe that our
proposed policy would remove
unnecessary restrictions on U.S. air
carriers’ access to the global capital
market without compromising the
statutory requirement that U.S. citizens
remain in actual control of such carriers.
We are issuing a supplemental notice
of proposed rulemaking (SNPRM)
because, after reviewing comments
submitted on the NPRM and in
consultation with other Executive
Branch agencies, we have decided to
strengthen the proposal in several areas.
We have revised the proposed rule
further to ensure that U.S. citizens will
VerDate Aug<31>2005
14:37 May 04, 2006
Jkt 208001
have actual control of the air carrier. We
are also mindful of the strong interest in
this proposal expressed by members of
Congress. This SNPRM will furnish
Congress the opportunity to review the
proposal in its refined form, and to
undertake a more informed assessment
of its likely consequences.
Our NPRM proposal would allow for
delegation to foreign investors of
decision-making authority regarding
commercial issues, but in the areas of
organizational documents, safety,
security, and the Civil Reserve Air Fleet
(CRAF) program the NPRM would not
permit these delegations. In a key
refinement of our original proposal, we
now propose in this SNPRM to require
that any such delegation of authority to
foreign interests by the U.S. citizen
majority owners be revocable. We are
proposing this change to ensure that,
notwithstanding their ability to delegate
decision-making authority over certain
commercial matters (as described in the
NPRM) to foreign investor interests, the
U.S. voting shareholders of a U.S.
airline will retain actual control of the
airline.
We originally proposed to reserve
exclusively to U.S. citizens decisions
relating to organizational documents,
safety, security, and CRAF. In another
refinement, in keeping with suggestions
received from the Departments of
Homeland Security and Defense as well
as the Federal Aviation Administration,
we are now proposing to broaden the
scope of the decision-making that must
remain under the actual control of U.S.
citizens. The aspects of control of safety
and security decisions would no longer
be limited to those implementing FAA
and TSA safety and security regulations,
but would cover safety and security
decisions generally. Similarly, the
proposed control of CRAF decisions
would be expanded to cover all national
defense airlift commitments. Our
proposed expansion of the coverage of
these three areas will ensure that all
critical elements of a carrier’s decisionmaking that could impact safety,
security, and national defense airlift are
fully covered, and that our review of a
carrier’s compliance with these
requirements will not be unduly
narrow.
We tentatively conclude that, as
modified, this proposal will eliminate
unnecessary and anachronistic
limitations on the ability of eligible
foreign minority investors to participate
in the commercial decision-making at a
U.S. airline in which they have made an
otherwise statutorily-permitted
investment. At the same time, it should
eliminate any doubt that the voting
stockholders (75 percent of whom are
PO 00000
Frm 00003
Fmt 4702
Sfmt 4702
26425
U.S. citizens) and the board of directors
(two-thirds of whom are U.S. citizens)
will retain full control over decisions
regarding safety, security, and
contributions to our national defense
airlift capability, and that those U.S.
citizens also retain ‘‘actual control’’ of
the carrier as a whole as required by
statute.
Comments must be submitted on
or before July 5, 2006.
ADDRESSES: You may submit comments
identified by DMS Docket Number
OST–2003–15759 using any of the
following methods:
• Web site: https://dms.dot.gov.
Follow the instructions for submitting
comments on the DOT electronic docket
site.
• Fax: 1–202–493–2251.
• Mail: Docket Operations; U.S.
Department of Transportation, 400
Seventh Street, SW., Nassif Building,
Room PL–401, Washington, DC 20590–
001.
• Hand Delivery: Room PL–401 on
the plaza level of the Nassif Building,
400 Seventh Street, SW., Washington,
DC, between 9 a.m. and 5 p.m., Monday
through Friday, except Federal holidays.
• Federal eRulemaking Portal: Go to
https://www.regulations.gov. Follow the
online instructions for submitting
comments.
Instructions: All submissions must
include the agency name and docket
number or Regulatory Identification
Number (RIN) for this rulemaking. For
detailed instructions on submitting
comments and additional information
on the rulemaking process, see the
Public Participation heading of the
Supplementary Information section of
this document. Note that all comments
received will be posted without change
to https://dms.dot.gov, including any
personal information provided. Please
see the Privacy Act heading under
Regulatory Notices. We will consider
late filed comments to the extent
possible.
Docket: For access to the docket to
read background documents or
comments received, go to https://
dms.dot.gov at any time or to Room PL–
401 on the plaza level of the Nassif
Building, 400 Seventh Street, SW.,
Washington, DC, between 9 a.m. and 5
p.m., Monday through Friday, except
Federal holidays.
FOR FURTHER INFORMATION CONTACT:
William M. Bertram, Chief, Air Carrier
Fitness Division (X–56), Office of
Aviation Analysis, U.S. Department of
Transportation, 400 Seventh Street,
SW., Washington, DC 20590; (202) 366–
9721.
DATES:
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Agencies
[Federal Register Volume 71, Number 87 (Friday, May 5, 2006)]
[Proposed Rules]
[Pages 26423-26425]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E6-6795]
========================================================================
Proposed Rules
Federal Register
________________________________________________________________________
This section of the FEDERAL REGISTER contains notices to the public of
the proposed issuance of rules and regulations. The purpose of these
notices is to give interested persons an opportunity to participate in
the rule making prior to the adoption of the final rules.
========================================================================
Federal Register / Vol. 71, No. 87 / Friday, May 5, 2006 / Proposed
Rules
[[Page 26423]]
=======================================================================
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2006-24691; Directorate Identifier 2006-NM-051-AD]
RIN 2120-AA64
Airworthiness Directives; Boeing Model 737-600, -700, -700C, -
800, and -900 Series Airplanes
AGENCY: Federal Aviation Administration (FAA), Department of
Transportation (DOT).
ACTION: Notice of proposed rulemaking (NPRM).
-----------------------------------------------------------------------
SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD)
for certain Boeing Model 737-600, -700, -700C, -800, and -900 series
airplanes. This proposed AD would require testing the electrical
resistance of the bond between the bulkhead fitting for the fuel feed
line and the front spar of the left and right wings, inspecting an
adjacent bonding jumper to make sure it is installed correctly, and
performing corrective and other specified actions as applicable. This
proposed AD results from fuel system reviews conducted by the
manufacturer. We are proposing this AD to prevent arcing or sparking in
the fuel tank in the event of a lightning strike, which could result in
an uncontrolled fire or explosion.
DATES: We must receive comments on this proposed AD by June 19, 2006.
ADDRESSES: Use one of the following addresses to submit comments on
this proposed AD.
DOT Docket Web site: Go to https://dms.dot.gov and follow
the instructions for sending your comments electronically.
Government-wide rulemaking Web site: Go to https://
www.regulations.gov and follow the instructions for sending your
comments electronically.
Mail: Docket Management Facility, U.S. Department of
Transportation, 400 Seventh Street, SW., Nassif Building, Room PL-401,
Washington, DC 20590.
Fax: (202) 493-2251.
Hand Delivery: Room PL-401 on the plaza level of the
Nassif Building, 400 Seventh Street, SW., Washington, DC, between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
Contact Boeing Commercial Airplanes, P.O. Box 3707, Seattle,
Washington 98124-2207, for the service information identified in this
proposed AD.
FOR FURTHER INFORMATION CONTACT: Doug Pegors, Aerospace Engineer,
Propulsion Branch, ANM-140S, FAA, Seattle Aircraft Certification
Office, 1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone
(425) 917-6504; fax (425) 917-6590.
SUPPLEMENTARY INFORMATION:
Comments Invited
We invite you to submit any relevant written data, views, or
arguments regarding this proposed AD. Send your comments to an address
listed in the ADDRESSES section. Include the docket number ``FAA-2006-
24691; Directorate Identifier 2006-NM-051-AD'' at the beginning of your
comments. We specifically invite comments on the overall regulatory,
economic, environmental, and energy aspects of the proposed AD. We will
consider all comments received by the closing date and may amend the
proposed AD in light of those comments.
We will post all comments we receive, without change, to https://
dms.dot.gov, including any personal information you provide. We will
also post a report summarizing each substantive verbal contact with FAA
personnel concerning this proposed AD. Using the search function of
that Web site, anyone can find and read the comments in any of our
dockets, including the name of the individual who sent the comment (or
signed the comment on behalf of an association, business, labor union,
etc.). You may review DOT's complete Privacy Act Statement in the
Federal Register published on April 11, 2000 (65 FR 19477-78), or you
may visit https://dms.dot.gov.
Examining the Docket
You may examine the AD docket on the Internet at https://
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. Comments will be
available in the AD docket shortly after the Docket Management System
receives them.
Discussion
The FAA has examined the underlying safety issues involved in fuel
tank explosions on several large transport airplanes, including the
adequacy of existing regulations, the service history of airplanes
subject to those regulations, and existing maintenance practices for
fuel tank systems. As a result of those findings, we issued a
regulation titled ``Transport Airplane Fuel Tank System Design Review,
Flammability Reduction and Maintenance and Inspection Requirements''
(67 FR 23086, May 7, 2001). In addition to new airworthiness standards
for transport airplanes and new maintenance requirements, this rule
included Special Federal Aviation Regulation No. 88 (``SFAR 88,''
Amendment 21-78, and subsequent Amendments 21-82 and 21-83).
Among other actions, SFAR 88 requires certain type design (i.e.,
type certificate (TC) and supplemental type certificate (STC)) holders
to substantiate that their fuel tank systems can prevent ignition
sources in the fuel tanks. This requirement applies to type design
holders for large turbine-powered transport airplanes and for
subsequent modifications to those airplanes. It requires them to
perform design reviews and to develop design changes and maintenance
procedures if their designs do not meet the new fuel tank safety
standards. As explained in the preamble to the rule, we intended to
adopt airworthiness directives to mandate any changes found necessary
to address unsafe conditions identified as a result of these reviews.
In evaluating these design reviews, we have established four
criteria intended to define the unsafe conditions associated with fuel
tank systems that require corrective actions. The percentage of
operating time during which fuel tanks are exposed to flammable
conditions is one of these criteria. The other three criteria address
[[Page 26424]]
the failure types under evaluation: Single failures, single failures in
combination with a latent condition(s), and in-service failure
experience. For all four criteria, the evaluations included
consideration of previous actions taken that may mitigate the need for
further action.
We have determined that the actions identified in this AD are
necessary to reduce the potential of ignition sources inside fuel
tanks, which, in combination with flammable fuel vapors, could result
in fuel tank explosions and consequent loss of the airplane.
We have received a report indicating that, during production of
certain Boeing Model 737-600, -700, -700C, -800, and -900 series
airplanes, the electrical bond between the bulkhead fitting for the
fuel feed line and the wing front spar was not adequately tested to
verify that the bond meets the required resistance. Testing of the
electrical bond, and the application of sealant, is intended to prevent
ignition sources from entering the fuel tank in the event of a
lightning strike. Arcing or sparking in the fuel tank could result in
an uncontrolled fire or explosion.
Relevant Service Information
We have reviewed Boeing Special Attention Service Bulletin 737-28-
1225, dated January 12, 2006. The service bulletin describes procedures
for testing the electrical resistance of the bond between the bulkhead
fitting for the fuel feed line and the front spar on the left and right
wings, performing a general visual inspection of adjacent bonding
jumpers to make sure they are installed correctly, and performing
corrective actions as applicable. Regardless of the findings of the
resistance test, the service bulletin details other specified actions
that entail applying sealant to the aft side of the bulkhead fitting to
encapsulate the fitting and the fuel feed tube coupling.
If the electrical resistance test results in a value that is
outside the limits identified in the service bulletin, the service
bulletin specifies corrective actions including repairing the bond and
retesting to verify adequate electrical resistance.
If the bonding jumper is not installed correctly, the corrective
action is reinstalling the jumper correctly.
Accomplishing the actions specified in the service information is
intended to adequately address the unsafe condition.
FAA's Determination and Requirements of the Proposed AD
We have evaluated all pertinent information and identified an
unsafe condition that is likely to exist or develop on other airplanes
of this same type design. For this reason, we are proposing this AD,
which would require accomplishing the actions specified in the service
information described previously.
Costs of Compliance
There are about 1,541 airplanes of the affected design in the
worldwide fleet.
This proposed AD would affect about 591 airplanes of U.S. registry.
The proposed actions would take about 4 work hours per airplane, at an
average labor rate of $80 per work hour. Based on these figures, the
estimated cost of the proposed AD for U.S. operators is $189,120, or
$320 per airplane.
Authority for This Rulemaking
Title 49 of the United States Code specifies the FAA's authority to
issue rules on aviation safety. 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.
We are issuing this rulemaking under the authority described in
subtitle VII, part A, subpart III, section 44701, ``General
requirements.'' Under that section, Congress charges the FAA 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
rulemaking action.
Regulatory Findings
We have determined that this proposed AD would not have federalism
implications under Executive Order 13132. This proposed AD 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.
For the reasons discussed above, I certify that the 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. 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 proposed AD and placed it in the AD docket. 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, Safety.
The Proposed Amendment
Accordingly, under the authority delegated to me by the
Administrator, the FAA proposes to amend 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. The Federal Aviation Administration (FAA) amends Sec. 39.13 by
adding the following new airworthiness directive (AD):
Boeing: Docket No. FAA-2006-24691; Directorate Identifier 2006-NM-
051-AD.
Comments Due Date
(a) The FAA must receive comments on this AD action by June 19,
2006.
Affected ADs
(b) None.
Applicability
(c) This AD applies to Boeing Model 737-600, -700, -700C, -800,
and -900 series airplanes, certificated in any category, as
identified in Boeing Special Attention Service Bulletin 737-28-1225,
dated January 12, 2006.
Unsafe Condition
(d) This AD results from fuel system reviews conducted by the
manufacturer. We are issuing this AD to prevent arcing or sparking
in the fuel tank in the event of a lightning strike, which could
result in an uncontrolled fire or 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.
Test, Inspection, and Corrective and Other Specified Actions
(f) Within 60 months after the effective date of this AD, test
the electrical resistance of the bond between the bulkhead fitting
for the fuel feed line and the wing front spar on the left and right
wings, do a general visual inspection of adjacent bonding jumpers to
make sure they are installed correctly, and do all applicable
corrective and other specified actions by doing all of the actions
specified in the Accomplishment Instructions of Boeing Special
Attention Service Bulletin
[[Page 26425]]
737-28-1225, dated January 12, 2006. All applicable corrective
actions and other specified actions must be done before further
flight after the electrical resistance test.
Alternative Methods of Compliance (AMOCs)
(g)(1) The Manager, Seattle Aircraft Certification Office (ACO),
FAA, has the authority to approve AMOCs for this AD, if requested in
accordance with the procedures found in 14 CFR 39.19.
(2) Before using any AMOC approved in accordance with Sec.
39.19 on any airplane to which the AMOC applies, notify the
appropriate principal inspector in the FAA Flight Standards
Certificate Holding District Office.
Issued in Renton, Washington, on April 28, 2006.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. E6-6795 Filed 5-4-06; 8:45 am]
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