Airworthiness Directives; Boeing Model 747-200F, 747-300, 747-400, and 747-400D Series Airplanes, 58768-58770 [E7-20467]

Download as PDF 58768 Federal Register / Vol. 72, No. 200 / Wednesday, October 17, 2007 / Proposed Rules bulletin. Repeat the inspections thereafter at the applicable interval specified in paragraph 1.E. of the service bulletin. Exception to Compliance Times (g) Where Tables 1, 2, and 3 of paragraph 1.E. of Boeing Alert Service Bulletin 737– 56A1023, dated May 24, 2007, specify counting the compliance time from ‘‘* * * the date on this service bulletin,’’ this AD requires counting the compliance time from the effective date of this AD. Alternative Methods of Compliance (AMOCs) Issued in Renton, Washington, on October 5, 2007. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E7–20466 Filed 10–16–07; 8:45 am] cprice-sewell on PROD1PC66 with PROPOSALS VerDate Aug<31>2005 14:41 Oct 16, 2007 Jkt 214001 Examining the AD Docket Federal Aviation Administration 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 proposed AD, the regulatory evaluation, any comments received, and other information. The street address for the Docket Office (telephone 800–647–5527) is in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt. FOR FURTHER INFORMATION CONTACT: Ivan Li, Aerospace Engineer, Airframe Branch, ANM–120S, FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue, SW., Renton, Washington 98057–3356; telephone (425) 917–6437; fax (425) 917–6590. SUPPLEMENTARY INFORMATION: 14 CFR Part 39 [Docket No. FAA–2007–0045; Directorate Identifier 2007–NM–169– AD] RIN 2120–AA64 Airworthiness Directives; Boeing Model 747–200F, 747–300, 747–400, and 747–400D Series Airplanes Federal Aviation Administration (FAA), Department of Transportation (DOT). ACTION: Notice of proposed rulemaking (NPRM). AGENCY: (h)(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) 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. (3) An AMOC that provides an acceptable level of safety may be used for any repair required by this AD, if it is approved by an Authorized Representative for the Boeing Commercial Airplanes Delegation Option Authorization Organization who has been authorized by the Manager, Seattle ACO, to make those findings. For a repair method to be approved, the repair must meet the certification basis of the airplane, and the approval must specifically refer to this AD. (4) Installation of metallic window blanks at cockpit eyebrow windows No. 4 and No. 5 in accordance with Supplemental Type Certificate ST01630SE is approved as an AMOC to the initial and repetitive inspections for the flight deck No. 4 and No. 5 windows required by paragraph (f) of this AD. All other applicable actions required by paragraph (f) of this AD must be fully complied with. BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) for certain Boeing Model 747–200F, 747– 300, 747–400, and 747–400D series airplanes. This proposed AD would require a detailed inspection to detect missing fasteners from the shear clip at a certain stub frame to auxiliary sill joint, and applicable related investigative and corrective actions. This proposed AD results from reports of missing fasteners from the shear clip of the stub frame to auxiliary sill joint and cracking of the adjacent exterior skin and internal doubler. We are proposing this AD to ensure that fasteners are installed in the shear clip of the stub frame to auxiliary sill joint. Missing fasteners could result in cracks in the adjacent exterior skin and internal doubler, which can propagate and result in loss of structural integrity and sudden in-flight decompression of the airplane. DATES: We must receive comments on this proposed AD by December 3, 2007. ADDRESSES: You may send comments by any of the following methods: • Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow the instructions for submitting comments. • Fax: 202–493–2251. • Mail: U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590. • Hand Delivery: U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590, 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. PO 00000 Frm 00006 Fmt 4702 Sfmt 4702 Comments Invited We invite you to send any written relevant data, views, or arguments about this proposed AD. Send your comments to an address listed under the ADDRESSES section. Include ‘‘Docket No. FAA–2007–0045; Directorate Identifier 2007–NM–169–AD’’ at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of this proposed AD. We will consider all comments received by the closing date and may amend this proposed AD because of those comments. We will post all comments we receive, without change, to https:// www.regulations.gov, including any personal information you provide. We will also post a report summarizing each substantive verbal contact we receive about this proposed AD. Discussion We have received two reports of cracks found in the exterior skin and internal doubler adjacent to the shear clip at the stub frame to auxiliary sill joint at stringer 30 (left and right sides), body station (BS) 488. In addition, on one of the airplanes, seven fasteners were missing from the shear clip on the left side of the airplane. The cause of the missing fasteners has been attributed to a manufacturing process error. If any fastener is missing from the shear clip at the stub frame to auxiliary sill joint, cracks could result in the exterior skin and internal doubler. Such cracks can propagate and result in loss of structural integrity and sudden in-flight decompression of the airplane. E:\FR\FM\17OCP1.SGM 17OCP1 Federal Register / Vol. 72, No. 200 / Wednesday, October 17, 2007 / Proposed Rules Relevant Service Information We have reviewed Boeing Alert Service Bulletin 747–53A2685, dated May 31, 2007. The service bulletin describes procedures for doing a detailed inspection to detect missing fasteners from the shear clip at the stub frame to auxiliary sill joint at stringer 30 (left and right sides), BS 488, and applicable related investigative and corrective actions. The related investigative actions include doing an open hole high frequency eddy current inspection to detect cracks at certain fastener locations in the exterior skin and internal doubler, and repetitive low frequency eddy current inspections to detect cracks at the edge row fasteners of any skin repair doubler, as applicable. The corrective actions include trimming out cracks, installing missing fasteners, installing skin repair doublers, and contacting Boeing for certain repair conditions, as applicable. The service bulletin also specifies the following compliance times: • For the initial detailed inspection: Before 6,000 total flight cycles, or within 3,000 flight cycles, whichever occurs later. • For the related investigative actions: Before further flight (for an open hole high frequency eddy current inspection), and within 15,000 flight cycles after installation of repair and thereafter at intervals not to exceed 1,500 flight cycles (for low frequency eddy current inspections). • For the corrective actions: Before further flight. 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 cprice-sewell on PROD1PC66 with PROPOSALS 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, except as discussed under ‘‘Differences Between the Proposed AD and Service Information.’’ Differences Between the Proposed AD and Service Information The service bulletin specifies to contact the manufacturer for instructions on how to repair certain conditions, but this proposed AD would require repairing those conditions in one of the following ways: • Using a method that we approve; or VerDate Aug<31>2005 14:41 Oct 16, 2007 Jkt 214001 58769 • Using data that meet the certification basis of the airplane, and that have been approved by an Authorized Representative for the Boeing Commercial Airplanes Delegation Option Authorization Organization whom we have authorized to make those findings. 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. Costs of Compliance There are about 98 airplanes of the affected design in the worldwide fleet. This proposed AD would affect about 8 airplanes of U.S. registry. The proposed actions would take about 1 work hour 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 $640, or $80 per airplane. Air transportation, Aircraft, Aviation safety, Safety. 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. 1. The authority citation for part 39 continues to read as follows: 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. Unsafe Condition PO 00000 Frm 00007 Fmt 4702 Sfmt 4702 List of Subjects in 14 CFR Part 39 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 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–2007–0045; Directorate Identifier 2007–NM–169–AD. Comments Due Date (a) The FAA must receive comments on this AD action by December 3, 2007. Affected ADs (b) None. Applicability (c) This AD applies to Boeing Model 747– 200F, 747–300, 747–400, and 747–400D series airplanes, certificated in any category; as identified in Boeing Alert Service Bulletin 747–53A2685, dated May 31, 2007. (d) This AD results from two reports of cracks found in the exterior skin and internal doubler adjacent to the shear clip at the stub frame to auxiliary sill joint at stringer 30 (left and right sides), body station (BS) 488. In addition, on one of the airplanes, seven fasteners were missing from the shear clip on the left side of the airplane. The cause of the missing fasteners has been attributed to a manufacturing process error. We are issuing this AD to ensure fasteners in the shear clip of the stub frame to auxiliary sill joints (left and right sides) are installed. Missing fasteners could result in cracks in the exterior skin and internal doubler, which can propagate and result in loss of structural integrity and sudden in-flight decompression 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. E:\FR\FM\17OCP1.SGM 17OCP1 58770 Federal Register / Vol. 72, No. 200 / Wednesday, October 17, 2007 / Proposed Rules Inspection and Applicable Related Investigative and Corrective Actions DEPARTMENT OF TRANSPORTATION (f) At the applicable compliance time and repeat intervals listed in Tables 1 and 2 of paragraph 1.E., ‘‘Compliance,’’ of Boeing Service Bulletin 747–53A2685, dated May 31, 2007; except that where the service bulletin specifies a compliance time after the date on the service bulletin, this AD requires compliance within the specified compliance time after the effective date of this AD: Do the inspection and applicable related investigative and corrective actions by accomplishing all the applicable actions specified in the Accomplishment Instructions of the service bulletin, except as provided by paragraph (g) of this AD. Federal Aviation Administration Repair of Cracks (g) If any crack is found during any inspection required by this AD, and Boeing Service Bulletin 747–53A2685, dated May 31, 2007, specifies to contact Boeing for appropriate action: Before further flight, repair the crack using a method approved in accordance with the procedures specified in paragraph (h) of this AD. Alternative Methods of Compliance (AMOCs) (h)(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) 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. (3) An AMOC that provides an acceptable level of safety may be used for any repair required by this AD, if it is approved by an Authorized Representative for the Boeing Commercial Airplanes Delegation Option Authorization Organization who has been authorized by the Manager, Seattle ACO, to make those findings. For a repair method to be approved, the repair must meet the certification basis of the airplane, and the approval must specifically refer to this AD. cprice-sewell on PROD1PC66 with PROPOSALS Issued in Renton, Washington, on October 9, 2007. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E7–20467 Filed 10–16–07; 8:45 am] BILLING CODE 4910–13–P VerDate Aug<31>2005 14:41 Oct 16, 2007 Jkt 214001 14 CFR Part 39 [Docket No. FAA–2007–0048; Directorate Identifier 2007–NM–181–AD] RIN 2120–AA64 Airworthiness Directives; Construcciones Aeronauticas, S.A. (CASA), Model CN–235, CN–235–100, CN–235–200, CN–235–300, and C–295 Airplanes Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: SUMMARY: We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: Subsequent to accidents involving Fuel Tank System explosions in flight * * * and on ground, * * * Special Federal Aviation Regulation 88 (SFAR88) * * * required a safety review of the aircraft Fuel Tank System * * *. * * * * * Fuel Airworthiness Limitations are items arising from a systems safety analysis that have been shown to have failure mode(s) associated with an ‘unsafe condition’ * * *. These are identified in Failure Conditions for which an unacceptable probability of ignition risk could exist if specific tasks and/or practices are not performed in accordance with the manufacturers’ requirements. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI. DATES: We must receive comments on this proposed AD by November 16, 2007. ADDRESSES: You may send comments by any of the following methods: • Fax: (202) 493–2251. • Mail: U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590. • Hand Delivery: Room W12–140 on the ground floor of the West Building, 1200 New Jersey Avenue, SE., 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 instructions for submitting comments. PO 00000 Frm 00008 Fmt 4702 Sfmt 4702 Examining the AD Docket You may examine the AD docket on the Internet at https:// www.regulations.gov; or in person at the Docket Operations office between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this proposed AD, the regulatory evaluation, any comments received, and other information. The street address for the Docket Operations office (telephone (800) 647–5527) is in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt. FOR FURTHER INFORMATION CONTACT: Shahram Daneshmandi, Aerospace Engineer, International Branch, ANM– 116, FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington 98057–3356; telephone (425) 227–1112; fax (425) 227–1149. SUPPLEMENTARY INFORMATION: Comments Invited We invite you to send any written relevant data, views, or arguments about this proposed AD. Send your comments to an address listed under the ADDRESSES section. Include ‘‘Docket No. FAA–2007–0048; Directorate Identifier 2007–NM–181–AD’’ at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of this proposed AD. We will consider all comments received by the closing date and may amend this proposed AD based on 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 we receive about this proposed AD. Discussion The European Aviation Safety Agency (EASA), which is the Technical Agent for the Member States of the European Community, has issued EASA Airworthiness Directive 2007–0007, dated January 9, 2007 (referred to after this as ‘‘the MCAI’’), to correct an unsafe condition for the specified products. The MCAI states: Subsequent to accidents involving Fuel Tank System explosions in flight * * * and on ground, the FAA published Special Federal Aviation Regulation 88 (SFAR 88) in June 2001. SFAR 88 required a safety review of the aircraft Fuel Tank System to determine that the design meets the requirements of FAR (Federal Aviation Regulation) § 25.901 and § 25.981(a) and (b). A similar regulation has been recommended by the JAA (Joint Aviation E:\FR\FM\17OCP1.SGM 17OCP1

Agencies

[Federal Register Volume 72, Number 200 (Wednesday, October 17, 2007)]
[Proposed Rules]
[Pages 58768-58770]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E7-20467]


-----------------------------------------------------------------------

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2007-0045; Directorate Identifier 2007-NM-169- AD]
RIN 2120-AA64


Airworthiness Directives; Boeing Model 747-200F, 747-300, 747-
400, and 747-400D 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 747-200F, 747-300, 747-400, and 747-400D 
series airplanes. This proposed AD would require a detailed inspection 
to detect missing fasteners from the shear clip at a certain stub frame 
to auxiliary sill joint, and applicable related investigative and 
corrective actions. This proposed AD results from reports of missing 
fasteners from the shear clip of the stub frame to auxiliary sill joint 
and cracking of the adjacent exterior skin and internal doubler. We are 
proposing this AD to ensure that fasteners are installed in the shear 
clip of the stub frame to auxiliary sill joint. Missing fasteners could 
result in cracks in the adjacent exterior skin and internal doubler, 
which can propagate and result in loss of structural integrity and 
sudden in-flight decompression of the airplane.

DATES: We must receive comments on this proposed AD by December 3, 
2007.

ADDRESSES: You may send comments by any of the following methods:
     Federal eRulemaking Portal: Go to https://
www.regulations.gov. Follow the instructions for submitting comments.
     Fax: 202-493-2251.
     Mail: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue, SE., Washington, DC 20590.
     Hand Delivery: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue, SE., Washington, DC 20590, 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.

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 proposed AD, the regulatory 
evaluation, any comments received, and other information. The street 
address for the Docket Office (telephone 800-647-5527) is in the 
ADDRESSES section. Comments will be available in the AD docket shortly 
after receipt.

FOR FURTHER INFORMATION CONTACT: Ivan Li, Aerospace Engineer, Airframe 
Branch, ANM-120S, FAA, Seattle Aircraft Certification Office, 1601 Lind 
Avenue, SW., Renton, Washington 98057-3356; telephone (425) 917-6437; 
fax (425) 917-6590.

SUPPLEMENTARY INFORMATION:

Comments Invited

    We invite you to send any written relevant data, views, or 
arguments about this proposed AD. Send your comments to an address 
listed under the ADDRESSES section. Include ``Docket No. FAA-2007-0045; 
Directorate Identifier 2007-NM-169-AD'' at the beginning of your 
comments. We specifically invite comments on the overall regulatory, 
economic, environmental, and energy aspects of this proposed AD. We 
will consider all comments received by the closing date and may amend 
this proposed AD because of those comments.
    We will post all comments we receive, without change, to https://
www.regulations.gov, including any personal information you provide. We 
will also post a report summarizing each substantive verbal contact we 
receive about this proposed AD.

Discussion

    We have received two reports of cracks found in the exterior skin 
and internal doubler adjacent to the shear clip at the stub frame to 
auxiliary sill joint at stringer 30 (left and right sides), body 
station (BS) 488. In addition, on one of the airplanes, seven fasteners 
were missing from the shear clip on the left side of the airplane. The 
cause of the missing fasteners has been attributed to a manufacturing 
process error. If any fastener is missing from the shear clip at the 
stub frame to auxiliary sill joint, cracks could result in the exterior 
skin and internal doubler. Such cracks can propagate and result in loss 
of structural integrity and sudden in-flight decompression of the 
airplane.

[[Page 58769]]

Relevant Service Information

    We have reviewed Boeing Alert Service Bulletin 747-53A2685, dated 
May 31, 2007. The service bulletin describes procedures for doing a 
detailed inspection to detect missing fasteners from the shear clip at 
the stub frame to auxiliary sill joint at stringer 30 (left and right 
sides), BS 488, and applicable related investigative and corrective 
actions. The related investigative actions include doing an open hole 
high frequency eddy current inspection to detect cracks at certain 
fastener locations in the exterior skin and internal doubler, and 
repetitive low frequency eddy current inspections to detect cracks at 
the edge row fasteners of any skin repair doubler, as applicable. The 
corrective actions include trimming out cracks, installing missing 
fasteners, installing skin repair doublers, and contacting Boeing for 
certain repair conditions, as applicable.
    The service bulletin also specifies the following compliance times:
     For the initial detailed inspection: Before 6,000 total 
flight cycles, or within 3,000 flight cycles, whichever occurs later.
     For the related investigative actions: Before further 
flight (for an open hole high frequency eddy current inspection), and 
within 15,000 flight cycles after installation of repair and thereafter 
at intervals not to exceed 1,500 flight cycles (for low frequency eddy 
current inspections).
     For the corrective actions: Before further flight.
    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, except as discussed under 
``Differences Between the Proposed AD and Service Information.''

Differences Between the Proposed AD and Service Information

    The service bulletin specifies to contact the manufacturer for 
instructions on how to repair certain conditions, but this proposed AD 
would require repairing those conditions in one of the following ways:
     Using a method that we approve; or
     Using data that meet the certification basis of the 
airplane, and that have been approved by an Authorized Representative 
for the Boeing Commercial Airplanes Delegation Option Authorization 
Organization whom we have authorized to make those findings.

Costs of Compliance

    There are about 98 airplanes of the affected design in the 
worldwide fleet. This proposed AD would affect about 8 airplanes of 
U.S. registry. The proposed actions would take about 1 work hour 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 
$640, or $80 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-2007-0045; Directorate Identifier 2007-NM-
169-AD.

Comments Due Date

    (a) The FAA must receive comments on this AD action by December 
3, 2007.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Boeing Model 747-200F, 747-300, 747-400, 
and 747-400D series airplanes, certificated in any category; as 
identified in Boeing Alert Service Bulletin 747-53A2685, dated May 
31, 2007.

Unsafe Condition

    (d) This AD results from two reports of cracks found in the 
exterior skin and internal doubler adjacent to the shear clip at the 
stub frame to auxiliary sill joint at stringer 30 (left and right 
sides), body station (BS) 488. In addition, on one of the airplanes, 
seven fasteners were missing from the shear clip on the left side of 
the airplane. The cause of the missing fasteners has been attributed 
to a manufacturing process error. We are issuing this AD to ensure 
fasteners in the shear clip of the stub frame to auxiliary sill 
joints (left and right sides) are installed. Missing fasteners could 
result in cracks in the exterior skin and internal doubler, which 
can propagate and result in loss of structural integrity and sudden 
in-flight decompression 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.

[[Page 58770]]

Inspection and Applicable Related Investigative and Corrective Actions

    (f) At the applicable compliance time and repeat intervals 
listed in Tables 1 and 2 of paragraph 1.E., ``Compliance,'' of 
Boeing Service Bulletin 747-53A2685, dated May 31, 2007; except that 
where the service bulletin specifies a compliance time after the 
date on the service bulletin, this AD requires compliance within the 
specified compliance time after the effective date of this AD: Do 
the inspection and applicable related investigative and corrective 
actions by accomplishing all the applicable actions specified in the 
Accomplishment Instructions of the service bulletin, except as 
provided by paragraph (g) of this AD.

Repair of Cracks

    (g) If any crack is found during any inspection required by this 
AD, and Boeing Service Bulletin 747-53A2685, dated May 31, 2007, 
specifies to contact Boeing for appropriate action: Before further 
flight, repair the crack using a method approved in accordance with 
the procedures specified in paragraph (h) of this AD.

Alternative Methods of Compliance (AMOCs)

    (h)(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) 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.
    (3) An AMOC that provides an acceptable level of safety may be 
used for any repair required by this AD, if it is approved by an 
Authorized Representative for the Boeing Commercial Airplanes 
Delegation Option Authorization Organization who has been authorized 
by the Manager, Seattle ACO, to make those findings. For a repair 
method to be approved, the repair must meet the certification basis 
of the airplane, and the approval must specifically refer to this 
AD.

    Issued in Renton, Washington, on October 9, 2007.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. E7-20467 Filed 10-16-07; 8:45 am]
BILLING CODE 4910-13-P
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