Airworthiness Directives; Boeing Model 757 Airplanes, 19993-19995 [E8-7662]
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Federal Register / Vol. 73, No. 72 / Monday, April 14, 2008 / Rules and Regulations
19993
TABLE 3.—NEW MATERIAL INCORPORATED BY REFERENCE
Temporary revisions
Date
Canadair Temporary Revision 600/25–1
Canadair Temporary Revision 600–1/
20–1.
Canadair Temporary Revision 601/17–1
Canadair Temporary Revision 601/18–1
Canadair Temporary Revision 601/22–1
Canadair Temporary Revision 601/30–1
Canadair Temporary Revision 601/29–1
Canadair Temporary Revision 601/30–1
Bombardier Temporary Revision 604/
24–1.
Bombardier Temporary Revision 605/1–
1.
Canadair Temporary Revision RJ/155–3
March 20, 2008 ......
March 20, 2008 ......
Canadair Challenger CL–600–1A11 Airplane Flight Manual.
Canadair Challenger CL–600–1A11 Airplane Flight Manual (Winglets).
March
March
March
March
March
March
March
Canadair Challenger CL–600–2A12 Airplane Flight Manual, PSP 601–1B–1.
Canadair Challenger CL–600–2A12 Airplane Flight Manual, PSP 601–1A–1.
Canadair Challenger CL–600–2A12 Airplane Flight Manual, PSP 601–1B
Canadair Challenger CL–600–2A12 Airplane Flight Manual.
Canadair Challenger CL–600–2B16 Airplane Flight Manual, PSP 601A–1.
Canadair Challenger CL–600–2B16 Airplane Flight Manual, PSP 601A–1–1.
Bombardier Challenger CL–604 Airplane Flight Manual, PSP 604–1.
20,
20,
20,
20,
20,
20,
20,
2008
2008
2008
2008
2008
2008
2008
Airplane flight manual
......
......
......
......
......
......
......
March 20, 2008 ......
Bombardier Challenger CL–605 Airplane Flight Manual, PSP 605–1
March 25, 2008 ......
Canadair Regional Jet Airplane Flight Manual, CSP A–012.
TABLE 4.—PREVIOUS MATERIAL INCORPORATED BY REFERENCE
Canadair (Bombardier) temporary revision
RJ/149–1, February 1, 2005 ...............................
600/21, February 4, 2005 ....................................
600–1/16, February 4, 2005 ...............................
601/13, February 4, 2005 ....................................
601/14, February 4, 2005 ....................................
601/18, February 4, 2005 ....................................
601/24, February 4, 2005 ....................................
601/25, February 4, 2005 ....................................
601/26, February 4, 2005 ....................................
604/17, February 4, 2005 ....................................
Issued in Renton, Washington, on April 2,
2008.
Dionne Palermo,
Acting Manager, Transport Airplane
Directorate, Aircraft Certification Service.
[FR Doc. E8–7592 Filed 4–11–08; 8:45 am]
BILLING CODE 4910–13–P
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA–2007–0339; Directorate
Identifier 2007–NM–182–AD; Amendment
39–15464; AD 2008–08–12]
RIN 2120–AA64
Airworthiness Directives; Boeing
Model 757 Airplanes
Federal Aviation
Administration (FAA), DOT.
ACTION: Final rule.
cprice-sewell on PROD1PC62 with RULES
AGENCY:
SUMMARY: We are adopting a new
airworthiness directive (AD) for all
Boeing Model 757 airplanes. This AD
requires repetitive inspections of the
anchor tab of the bulkhead seal
assemblies of the wing thermal anti-ice
(TAI) system for cracks at certain
outboard stations of the left and right
wings, and corrective action if
necessary. This AD also provides
VerDate Aug<31>2005
15:37 Apr 11, 2008
Jkt 214001
Bombardier airplane flight manual
CL–600–2B19
CL–600–1A11
CL–600–1A11
CL–600–2A12
CL–600–2A12
CL–600–2A12
CL–600–2B16
CL–600–2B16
CL–600–2A12
CL–600–2B16
(Regional Jet Series 100 & 440), CSP A–012.
(CL–600), PSP 600 (US).
(CL–600), PSP 600–1 (US).
(CL–601), PSP 601–1B–1.
(CL–601), PSP 601–1A–1.
(CL–601), PSP 601–1B
(CL–601–3A and CL–601–3R), PSP 601A–1.
(CL–601–3A and CL–601–3R), PSP 601A–1–1.
(CL–601), PSP 601–1A.
(CL–604), PSP 604–1.
optional terminating action for the
repetitive inspections. This AD results
from reports of cracks found at the
anchor tab of the bulkhead seal
assemblies of the wing TAI system. In
one incident, the anchor tab and
bulkhead seal assembly had separated
because of the cracks. We are issuing
this AD to prevent failure of the anchor
tab of the bulkhead seal assembly,
which in icing conditions could result
in insufficient airflow to the wing TAI
system, subsequent ice on the wings,
and consequent reduced controllability
of the airplane.
DATES: This AD is effective May 19,
2008.
The Director of the Federal Register
approved the incorporation by reference
of certain publications listed in this AD
as of May 19, 2008.
ADDRESSES: For service information
identified in this AD, contact Boeing
Commercial Airplanes, P.O. Box 3707,
Seattle, Washington 98124–2207.
Examining the AD Docket
You may examine the AD docket on
the Internet at https://
www.regulations.gov; or in person at the
Docket Management Facility between 9
a.m. and 5 p.m., Monday through
Friday, except Federal holidays. The AD
docket contains this AD, the regulatory
evaluation, any comments received, and
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other information. The address for the
Docket Office (telephone 800–647–5527)
is the Document Management Facility,
U.S. Department of Transportation,
Docket Operations, M–30, West
Building, Ground Floor, Room W12–
140, 1200 New Jersey Avenue, SE.,
Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Barbara Mudrovich, Aerospace
Engineer, Cabin Safety and
Environmental Systems Branch, ANM–
150S, FAA, Seattle Aircraft Certification
Office, 1601 Lind Avenue, SW., Renton,
Washington 98057–3356; telephone
(425) 917–6477; fax (425) 917–6590.
SUPPLEMENTARY INFORMATION:
Discussion
We issued a notice of proposed
rulemaking (NPRM) to amend 14 CFR
part 39 to include an airworthiness
directive (AD) that would apply to all
Boeing Model 757 airplanes. That
NPRM was published in the Federal
Register on December 17, 2007 (72 FR
71275). That NPRM proposed to require
repetitive inspections of the anchor tab
of the bulkhead seal assemblies of the
wing thermal anti-ice (TAI) system for
cracks at certain outboard stations of the
left and right wings, and corrective
action if necessary. That NPRM also
proposed to provide for optional
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Federal Register / Vol. 73, No. 72 / Monday, April 14, 2008 / Rules and Regulations
terminating action for the repetitive
inspections.
Comments
We gave the public the opportunity to
participate in developing this AD. We
considered the comments received.
Support for the NPRM
Boeing concurs with the contents of
the NPRM.
cprice-sewell on PROD1PC62 with RULES
Request To Extend Compliance Time
Northwest Airlines (NWA) asks that
the repetitive inspection intervals
specified in the NPRM be changed from
6,000 flight hours to 24 months. NWA
states that because the NPRM already
allows up to 36 months after the
airplane has accumulated 20,000 total
flight hours to accomplish the initial
check, an acceptable level of safety
would be maintained if repetitive
intervals coincide with operatorscheduled heavy check intervals not to
exceed 24 months. NWA adds that if
repetitive inspections are at the
proposed 6,000-flight-hour intervals, the
inspections would need to be
accomplished in a line environment.
NWA asks that we allow the repetitive
inspections to be done during heavy
maintenance checks where specialized
personnel are available in a controlled
environment more conducive to
performing the work.
We do not agree to extend the
compliance time for the repetitive
inspections. Based on data from the
manufacturer, we find that a 6,000flight-hour interval is appropriate. We
do not currently have data or analysis,
nor did NWA provide any, that can
support such an extension of the
compliance time. We have determined
that the 6,000-flight-hour compliance
time is appropriate given the probability
of crack initiation, crack growth
characteristics, and the ability of
operators to integrate the required
actions into established maintenance
practices. However, according to the
provisions of paragraph (i) of this AD,
we may approve requests to adjust the
compliance time if the request includes
data that prove that the new compliance
time would provide an acceptable level
of safety. We have made no change to
the AD in this regard.
Request To Increase Work Hour
Estimate
NWA also states that the work-hour
estimate specified in the Costs of
Compliance section of the NPRM is
underestimated. NWA states that the 2hour estimate for the inspections is well
below the estimate provided by Boeing
Special Attention Service Bulletins 757–
VerDate Aug<31>2005
15:37 Apr 11, 2008
Jkt 214001
30–0021 and 757–30–0022, both
Revision 1, both dated June 13, 2007, as
referenced in the NPRM. NWA adds that
an accurate estimate for accomplishing
the inspections is 8 work hours (2 work
hours per support) when access is
provided at a heavy maintenance check.
From this comment, we infer that
NWA would like us to increase the
work-hour estimate given in the NPRM.
We do not agree. The cost information
below describes only the direct costs of
the specific actions required by this AD.
Based on the best data available, the
manufacturer provided the number of
work hours (2) necessary to do the
required inspections, as specified in the
service bulletins. This number
represents the time necessary to perform
only the actions actually required by
this AD. We recognize that, in doing the
actions required by an AD, operators
might incur incidental costs in addition
to the direct costs. The cost analysis in
AD rulemaking actions, however,
typically does not include incidental
costs such as the time required to gain
access and close up, time necessary for
planning, or time necessitated by other
administrative actions. Those incidental
costs, which might vary significantly
among operators, are almost impossible
to calculate. We have made no change
to the AD in this regard.
Conclusion
We reviewed the relevant data,
considered the comments received, and
determined that air safety and the
public interest require adopting the AD
as proposed.
Costs of Compliance
There are about 929 airplanes of the
affected design in the worldwide fleet.
This AD affects about 530 airplanes of
U.S. registry. The inspection takes about
2 work hours per airplane, at an average
labor rate of $80 per work hour. Based
on these figures, the estimated cost of
the AD for U.S. operators is $84,800, or
$160 per airplane, per inspection cycle.
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
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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
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.
You can find our regulatory
evaluation and the estimated costs of
compliance in the AD Docket.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation
safety, Incorporation by reference,
Safety.
Adoption of the Amendment
Accordingly, under the authority
delegated to me by the Administrator,
the FAA amends 14 CFR part 39 as
follows:
I
PART 39—AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:
I
Authority: 49 U.S.C. 106(g), 40113, 44701.
§ 39.13
[Amended]
2. The FAA amends § 39.13 by adding
the following new AD:
I
2008–08–12 Boeing: Amendment 39–15464.
Docket No. FAA–2007–0339; Directorate
Identifier 2007–NM–182–AD.
Effective Date
(a) This airworthiness directive (AD) is
effective May 19, 2008.
Affected ADs
(b) None.
Applicability
(c) This AD applies to all Boeing Model
757–200, –200PF, –200CB, and –300 series
airplanes, certificated in any category.
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Federal Register / Vol. 73, No. 72 / Monday, April 14, 2008 / Rules and Regulations
Unsafe Condition
(d) This AD results from reports of cracks
found at the anchor tab of the bulkhead seal
assemblies of the wing thermal anti-ice (TAI)
system. In one incident, the anchor tab and
bulkhead seal assembly had separated
because of the cracks. We are issuing this AD
to prevent failure of the anchor tab of the
bulkhead seal assembly, which in icing
conditions could result in insufficient airflow
to the wing TAI system, subsequent ice on
the wings, and consequent reduced
controllability of the airplane.
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.
Repetitive Inspections/Corrective Action
(f) At the applicable times specified in
paragraph 1.E., ‘‘Compliance,’’ of Boeing
Special Attention Service Bulletin 757–30–
0021 or 757–30–0022, both Revision 1, both
dated June 13, 2007, as applicable; except
where the service bulletins specify starting
the compliance time ‘‘ * * * from the date
on this service bulletin,’’ this AD requires
starting the compliance time from the
effective date of this AD: Perform detailed
inspections for cracks of the anchor tab of the
bulkhead seal assemblies of the wing TAI
system at certain outboard stations of the left
and right wings by doing all the actions,
including all applicable corrective actions, in
accordance with the Accomplishment
Instructions of the applicable service
bulletin. Do all applicable corrective actions
before further flight.
Optional Terminating Action
(g) Installing a new duct anchor support
bracket adjacent to the bulkhead seal
assemblies in accordance with Part 2 of the
Accomplishment Instructions of Boeing
Special Attention Service Bulletin 757–30–
0021 or 757–30–0022, both Revision 1, both
dated June 13, 2007, as applicable, ends the
repetitive inspections required by paragraph
(f) of this AD.
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Credit for Actions Done According to
Previous Issue of Service Information
(h) Actions accomplished before the
effective date of this AD in accordance with
Boeing Special Attention Service Bulletins
757–30–0021 and 757–30–0022, both dated
August 15, 2006, are considered acceptable
for compliance with the corresponding
actions specified in this AD.
Alternative Methods of Compliance
(AMOCs)
(i)(1) 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.
(2) To request a different method of
compliance or a different compliance time
for this AD, follow the procedures in 14 CFR
39.19. Before using any approved AMOC on
any airplane to which the AMOC applies,
notify your appropriate principal inspector
(PI) in the FAA Flight Standards District
VerDate Aug<31>2005
15:37 Apr 11, 2008
Jkt 214001
Office (FSDO), or lacking a PI, your local
FSDO.
Material Incorporated by Reference
(j) You must use Boeing Special Attention
Service Bulletin 757–30–0021, Revision 1,
dated June 13, 2007; or Boeing Special
Attention Service Bulletin 757–30–0022,
Revision 1, dated June 13, 2007; as
applicable; to do the actions required by this
AD, unless the AD specifies otherwise.
(1) The Director of the Federal Register
approved the incorporation by reference of
this service information under 5 U.S.C.
552(a) and 1 CFR part 51.
(2) For service information identified in
this AD, contact Boeing Commercial
Airplanes, P.O. Box 3707, Seattle,
Washington 98124–2207.
(3) You may review copies of the service
information incorporated by reference at the
FAA, Transport Airplane Directorate, 1601
Lind Avenue, SW., Renton, Washington; or 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: https://
www.archives.gov/federal_register/
code_of_federal_regulations/
ibr_locations.html.
Issued in Renton, Washington, on April 3,
2008.
Dionne Palermo,
Acting Manager, Transport Airplane
Directorate, Aircraft Certification Service.
[FR Doc. E8–7662 Filed 4–11–08; 8:45 am]
BILLING CODE 4910–13–P
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 71
[Docket No. FAA–2008–0203; Airspace
Docket No. 08–ANE–99]
Modification of Class D Airspace;
Brunswick, ME
Federal Aviation
Administration (FAA), DOT.
ACTION: Direct final rule, request for
comments.
AGENCY:
SUMMARY: This action modifies Class D
Airspace at Brunswick, ME. The
Brunswick NAS Air Traffic Control
Tower has become a part-time facility;
therefore, the Class D Airspace
associated with the tower operations
must be modified to reflect part-time
status. This action enhances the
National Airspace System by replacing
a more restricted airspace area with a
less restrictive one at Brunswick, ME.
DATES: Effective 0901 UTC, June 5,
2008. The Director of the Federal
Register approves this incorporation by
reference action under title 1, Code of
Federal Regulations, part 51, subject to
the annual revision of FAA Order
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Fmt 4700
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19995
7400.9 and publication of conforming
amendments. Comments for inclusion
in the Rules Docket must be received on
or before May 29, 2008.
ADDRESSES: Send comments on this rule
to: U.S. Department of Transportation,
Docket Operations, West Building
Ground Floor, Room W12–140, 1200
New Jersey Avenue, SE., Washington,
DC 20590–0001; Telephone: 1–800–
647–5527; Fax: 202–493–2251. You
must identify the Docket Number FAA–
2008 0203; Airspace Docket No. 08–
ANE–99, at the beginning of your
comments. You may also submit and
review received comments through the
Internet at https://www.regulations.gov.
You may review the public docket
containing the rule, any comments
received, and any final disposition in
person in the Dockets Office (see
ADDRESSES section for address and
phone number) between 9 a.m. and
5 p.m., Monday through Friday, except
Federal holidays. An informal docket
may also be examined during normal
business hours at the office of the
Eastern Service Center, Federal Aviation
Administration, Room 210, 1701
Columbia Avenue, College Park, Georgia
30337.
FOR FURTHER INFORMATION CONTACT:
Melinda Giddens, System Support
Group, Federal Aviation
Administration, P.O. Box 20636,
Atlanta, Georgia 30320; Telephone (404)
305–5610, Fax 404–305–5572.
SUPPLEMENTARY INFORMATION:
The Direct Final Rule Procedure
The FAA anticipates that this
regulation will not result in adverse or
negative comments, and, therefore,
issues it as a direct final rule. The FAA
has determined that this rule only
involves an established body of
technical regulations for which frequent
and routine amendments are necessary
to keep them operationally current.
Unless a written adverse or negative
comment or a written notice of intent to
submit an adverse or negative comment
is received within the comment period,
the regulation will become effective on
the date specified above. After the close
of the comment period, the FAA will
publish a document in the Federal
Register indicating that no adverse or
negative comments were received and
confirming the effective date. If the FAA
receives, within the comment period, an
adverse or negative comment, or written
notice of intent to submit such a
comment, a document withdrawing the
direct final rule will be published in the
Federal Register, and a notice of
proposed rulemaking may be published
with a new comment period.
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]]>Agencies
[Federal Register Volume 73, Number 72 (Monday, April 14, 2008)]
[Rules and Regulations]
[Pages 19993-19995]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E8-7662]
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2007-0339; Directorate Identifier 2007-NM-182-AD;
Amendment 39-15464; AD 2008-08-12]
RIN 2120-AA64
Airworthiness Directives; Boeing Model 757 Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
-----------------------------------------------------------------------
SUMMARY: We are adopting a new airworthiness directive (AD) for all
Boeing Model 757 airplanes. This AD requires repetitive inspections of
the anchor tab of the bulkhead seal assemblies of the wing thermal
anti-ice (TAI) system for cracks at certain outboard stations of the
left and right wings, and corrective action if necessary. This AD also
provides optional terminating action for the repetitive inspections.
This AD results from reports of cracks found at the anchor tab of the
bulkhead seal assemblies of the wing TAI system. In one incident, the
anchor tab and bulkhead seal assembly had separated because of the
cracks. We are issuing this AD to prevent failure of the anchor tab of
the bulkhead seal assembly, which in icing conditions could result in
insufficient airflow to the wing TAI system, subsequent ice on the
wings, and consequent reduced controllability of the airplane.
DATES: This AD is effective May 19, 2008.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of May 19, 2008.
ADDRESSES: For service information identified in this AD, contact
Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124-
2207.
Examining the AD Docket
You may examine the AD docket on the Internet at https://
www.regulations.gov; or in person at the Docket Management Facility
between 9 a.m. and 5 p.m., Monday through Friday, except Federal
holidays. The AD docket contains this AD, the regulatory evaluation,
any comments received, and other information. The address for the
Docket Office (telephone 800-647-5527) is the Document Management
Facility, U.S. Department of Transportation, Docket Operations, M-30,
West Building, Ground Floor, Room W12-140, 1200 New Jersey Avenue, SE.,
Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT: Barbara Mudrovich, Aerospace Engineer,
Cabin Safety and Environmental Systems Branch, ANM-150S, FAA, Seattle
Aircraft Certification Office, 1601 Lind Avenue, SW., Renton,
Washington 98057-3356; telephone (425) 917-6477; fax (425) 917-6590.
SUPPLEMENTARY INFORMATION:
Discussion
We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR
part 39 to include an airworthiness directive (AD) that would apply to
all Boeing Model 757 airplanes. That NPRM was published in the Federal
Register on December 17, 2007 (72 FR 71275). That NPRM proposed to
require repetitive inspections of the anchor tab of the bulkhead seal
assemblies of the wing thermal anti-ice (TAI) system for cracks at
certain outboard stations of the left and right wings, and corrective
action if necessary. That NPRM also proposed to provide for optional
[[Page 19994]]
terminating action for the repetitive inspections.
Comments
We gave the public the opportunity to participate in developing
this AD. We considered the comments received.
Support for the NPRM
Boeing concurs with the contents of the NPRM.
Request To Extend Compliance Time
Northwest Airlines (NWA) asks that the repetitive inspection
intervals specified in the NPRM be changed from 6,000 flight hours to
24 months. NWA states that because the NPRM already allows up to 36
months after the airplane has accumulated 20,000 total flight hours to
accomplish the initial check, an acceptable level of safety would be
maintained if repetitive intervals coincide with operator-scheduled
heavy check intervals not to exceed 24 months. NWA adds that if
repetitive inspections are at the proposed 6,000-flight-hour intervals,
the inspections would need to be accomplished in a line environment.
NWA asks that we allow the repetitive inspections to be done during
heavy maintenance checks where specialized personnel are available in a
controlled environment more conducive to performing the work.
We do not agree to extend the compliance time for the repetitive
inspections. Based on data from the manufacturer, we find that a 6,000-
flight-hour interval is appropriate. We do not currently have data or
analysis, nor did NWA provide any, that can support such an extension
of the compliance time. We have determined that the 6,000-flight-hour
compliance time is appropriate given the probability of crack
initiation, crack growth characteristics, and the ability of operators
to integrate the required actions into established maintenance
practices. However, according to the provisions of paragraph (i) of
this AD, we may approve requests to adjust the compliance time if the
request includes data that prove that the new compliance time would
provide an acceptable level of safety. We have made no change to the AD
in this regard.
Request To Increase Work Hour Estimate
NWA also states that the work-hour estimate specified in the Costs
of Compliance section of the NPRM is underestimated. NWA states that
the 2-hour estimate for the inspections is well below the estimate
provided by Boeing Special Attention Service Bulletins 757-30-0021 and
757-30-0022, both Revision 1, both dated June 13, 2007, as referenced
in the NPRM. NWA adds that an accurate estimate for accomplishing the
inspections is 8 work hours (2 work hours per support) when access is
provided at a heavy maintenance check.
From this comment, we infer that NWA would like us to increase the
work-hour estimate given in the NPRM. We do not agree. The cost
information below describes only the direct costs of the specific
actions required by this AD. Based on the best data available, the
manufacturer provided the number of work hours (2) necessary to do the
required inspections, as specified in the service bulletins. This
number represents the time necessary to perform only the actions
actually required by this AD. We recognize that, in doing the actions
required by an AD, operators might incur incidental costs in addition
to the direct costs. The cost analysis in AD rulemaking actions,
however, typically does not include incidental costs such as the time
required to gain access and close up, time necessary for planning, or
time necessitated by other administrative actions. Those incidental
costs, which might vary significantly among operators, are almost
impossible to calculate. We have made no change to the AD in this
regard.
Conclusion
We reviewed the relevant data, considered the comments received,
and determined that air safety and the public interest require adopting
the AD as proposed.
Costs of Compliance
There are about 929 airplanes of the affected design in the
worldwide fleet. This AD affects about 530 airplanes of U.S. registry.
The inspection takes about 2 work hours per airplane, at an average
labor rate of $80 per work hour. Based on these figures, the estimated
cost of the AD for U.S. operators is $84,800, or $160 per airplane, per
inspection cycle.
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
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.
You can find our regulatory evaluation and the estimated costs of
compliance in the AD Docket.
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 AD:
2008-08-12 Boeing: Amendment 39-15464. Docket No. FAA-2007-0339;
Directorate Identifier 2007-NM-182-AD.
Effective Date
(a) This airworthiness directive (AD) is effective May 19, 2008.
Affected ADs
(b) None.
Applicability
(c) This AD applies to all Boeing Model 757-200, -200PF, -200CB,
and -300 series airplanes, certificated in any category.
[[Page 19995]]
Unsafe Condition
(d) This AD results from reports of cracks found at the anchor
tab of the bulkhead seal assemblies of the wing thermal anti-ice
(TAI) system. In one incident, the anchor tab and bulkhead seal
assembly had separated because of the cracks. We are issuing this AD
to prevent failure of the anchor tab of the bulkhead seal assembly,
which in icing conditions could result in insufficient airflow to
the wing TAI system, subsequent ice on the wings, and consequent
reduced controllability of the airplane.
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.
Repetitive Inspections/Corrective Action
(f) At the applicable times specified in paragraph 1.E.,
``Compliance,'' of Boeing Special Attention Service Bulletin 757-30-
0021 or 757-30-0022, both Revision 1, both dated June 13, 2007, as
applicable; except where the service bulletins specify starting the
compliance time `` * * * from the date on this service bulletin,''
this AD requires starting the compliance time from the effective
date of this AD: Perform detailed inspections for cracks of the
anchor tab of the bulkhead seal assemblies of the wing TAI system at
certain outboard stations of the left and right wings by doing all
the actions, including all applicable corrective actions, in
accordance with the Accomplishment Instructions of the applicable
service bulletin. Do all applicable corrective actions before
further flight.
Optional Terminating Action
(g) Installing a new duct anchor support bracket adjacent to the
bulkhead seal assemblies in accordance with Part 2 of the
Accomplishment Instructions of Boeing Special Attention Service
Bulletin 757-30-0021 or 757-30-0022, both Revision 1, both dated
June 13, 2007, as applicable, ends the repetitive inspections
required by paragraph (f) of this AD.
Credit for Actions Done According to Previous Issue of Service
Information
(h) Actions accomplished before the effective date of this AD in
accordance with Boeing Special Attention Service Bulletins 757-30-
0021 and 757-30-0022, both dated August 15, 2006, are considered
acceptable for compliance with the corresponding actions specified
in this AD.
Alternative Methods of Compliance (AMOCs)
(i)(1) 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.
(2) To request a different method of compliance or a different
compliance time for this AD, follow the procedures in 14 CFR 39.19.
Before using any approved AMOC on any airplane to which the AMOC
applies, notify your appropriate principal inspector (PI) in the FAA
Flight Standards District Office (FSDO), or lacking a PI, your local
FSDO.
Material Incorporated by Reference
(j) You must use Boeing Special Attention Service Bulletin 757-
30-0021, Revision 1, dated June 13, 2007; or Boeing Special
Attention Service Bulletin 757-30-0022, Revision 1, dated June 13,
2007; as applicable; to do the actions required by this AD, unless
the AD specifies otherwise.
(1) The Director of the Federal Register approved the
incorporation by reference of this service information under 5
U.S.C. 552(a) and 1 CFR part 51.
(2) For service information identified in this AD, contact
Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington
98124-2207.
(3) You may review copies of the service information
incorporated by reference at the FAA, Transport Airplane
Directorate, 1601 Lind Avenue, SW., Renton, Washington; or 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: https://www.archives.gov/federal_register/code_of_federal_
regulations/ibr_locations.html.
Issued in Renton, Washington, on April 3, 2008.
Dionne Palermo,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. E8-7662 Filed 4-11-08; 8:45 am]
BILLING CODE 4910-13-P
