Airworthiness Directives; The Boeing Company Airplanes, 32918-32921 [2012-13439]

Download as PDF 32918 Federal Register / Vol. 77, No. 107 / Monday, June 4, 2012 / Proposed Rules A transcript of the public meeting will be included in the docket, which can be viewed as described in the Docket section at the beginning of this notice. In addition, any person may purchase a copy of the transcript from the transcribing reporter. Issued in Washington, DC, on May 29, 2012. Kathleen B. Hogan, Deputy Assistant Secretary for Energy, Energy Efficiency and Renewable Energy. [FR Doc. 2012–13401 Filed 6–1–12; 8:45 am] BILLING CODE 6450–01–P pmangrum on DSK3VPTVN1PROD with PROPOSALS-1 C. Submission of Comments DOE will accept comments, data, and other information regarding the issues raised in this notice before or after the public meeting, but no later than the date provided at the beginning of this notice. Please submit comments, data, and other information as provided in the ADDRESSES section. Submit electronic comments in WordPerfect, Microsoft Word, PDF, or text (ASCII) file format and avoid the use of special characters or any form of encryption. Comments in electronic format should be identified by the docket number EERE–2010–BT–STD–0048 and/or RIN 1904–AC04 and wherever possible carry the electronic signature of the author. No telefacsimilies (faxes) will be accepted. According to Title 10 of the Code of Federal Regulations, section 1004.11, any person submitting information that he or she believes to be confidential and exempt by law from public disclosure should submit two copies: One copy of the document including all the information believed to be confidential and one copy of the document with the information believed to be confidential deleted. DOE will make its own determination as to the confidential status of the information and treat it according to its determination. Factors of interest to DOE when evaluating requests to treat submitted information as confidential include (1) a description of the items; (2) whether and why such items are customarily treated as confidential within the industry; (3) whether the information is generally known by or available from other sources; (4) whether the information has previously been made available to others without obligation concerning its confidentiality; (5) an explanation of the competitive injury to the submitting person which would result from public disclosure; (6) a date upon which such information might lose its confidential nature due to the passage of time; and (7) why disclosure of the information would be contrary to the public interest. III. Approval of the Office of the Secretary The Secretary of Energy has approved publication of this notice. VerDate Mar<15>2010 15:11 Jun 01, 2012 Jkt 226001 DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2012–0491; Directorate Identifier 2011–NM–265–AD] RIN 2120–AA64 Airworthiness Directives; The Boeing Company Airplanes Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 737–100, –200, and –200C series airplanes. This proposed AD was prompted by a report of a severed upper butt strap, and cracks in the forward skin and bonded doubler, on one airplane. This proposed AD would require repetitive inspections for cracks and a chemical spot test in the area of station (STA) 908, and related investigative and corrective actions, if necessary. For certain airplanes, this proposed AD would require an inspection and modification. We are proposing this AD to prevent cracks at the adjacent mating skins (forward and aft), which could initiate just above stringers S–4R and S–4L; and could grow and result in a decompression event. SUMMARY: We must receive comments on this proposed AD by July 19, 2012. ADDRESSES: You may send comments, using the procedures found in 14 CFR 11.43 and 11.45, 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: Deliver to Mail address above between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. For service information identified in this proposed AD, contact Boeing DATES: PO 00000 Frm 00003 Fmt 4702 Sfmt 4702 Commercial Airplanes, Attention: Data & Services Management, P.O. Box 3707, MC 2H–65, Seattle, Washington 98124– 2207; telephone 206–544–5000, extension 1; fax 206–766–5680; email me.boecom@boeing.com; Internet https://www.myboeingfleet.com. You may review copies of the referenced service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington 98057–3356. For information on the availability of this material at the FAA, call (425) 227–1221. 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 (phone: 800–647–5527) is in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt. FOR FURTHER INFORMATION CONTACT: Wayne Lockett, Aerospace Engineer, Airframe Branch, ANM–120S, FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue SW., Renton, Washington 98057–3356; phone: (425) 917–6447; fax: (425) 917–6590; email: wayne.lockett@faa.gov. SUPPLEMENTARY INFORMATION: Comments Invited We invite you to send any written relevant data, views, or arguments about this proposal. Send your comments to an address listed under the ADDRESSES section. Include ‘‘Docket No. FAA– 2012–0491; Directorate Identifier 2011– NM–265–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 received a report of a severed upper butt strap, and cracks in the forward skin and bonded doubler, on E:\FR\FM\04JNP1.SGM 04JNP1 32919 Federal Register / Vol. 77, No. 107 / Monday, June 4, 2012 / Proposed Rules one airplane. Lab analysis of the upper butt strap identified 7075–T6 alloy, instead of the required 2024–T3 clad material. The airplane had accumulated approximately 61,000 total flight cycles and 58,000 total flight hours. The skin crack was found just above a previously installed lap joint modification. Such cracks, if not detected and corrected, could result in cracks at the adjacent mating skins (forward and aft), which could initiate just above stringers S–4R and S–4L; and could grow and result in a decompression event. Relevant Service Information We reviewed Boeing Special Attention Service Bulletin 737–53– 1313, dated November 3, 2011. For information on the procedures and compliance times, see this service information at https:// www.regulations.gov by searching for Docket No. FAA–2012–0491. FAA’s Determination We are proposing this AD because we evaluated all the relevant information and determined the unsafe condition described previously is likely to exist or develop in other products of the same type design. Proposed AD Requirements This proposed AD would require repetitive inspections (detailed, external low frequency eddy current (LFEC), or internal LFEC) for cracks and a chemical spot test in the area of STA 908, and related investigative and corrective actions, if necessary. Related investigative actions include a detailed inspection for corrosion of the skin, skin doubler, and lower butt strap; an openhole high frequency eddy current (HFEC) inspection for cracks of the skin, skin doubler, lower butt strap, and stringer splices; and an open-hole HFEC for cracks of the STA 908 upper butt strap. Corrective actions involve repairing, installing a new stringer splice; and installing a new STA 908 upper butt strap. For airplanes having line numbers 1 through 291, this proposed AD would require actions (inspection and modification) done in accordance with a method approved by the Manager, Seattle Aircraft Certification Office (ACO). Differences Between the Proposed AD and the Service Information instructions on how to repair certain conditions, but this proposed AD would require repairing those conditions in one of the following ways: • In accordance with a method that we approve; or • Using data that meet the certification basis of the airplane, and that have been approved by the Boeing Commercial Airplanes Organization Designation Authorization (ODA) whom we have authorized to make those findings. In addition, Boeing has not provided specific procedures for airplanes having line numbers 1 through 291, but indicates to contact Boeing for instructions ‘‘before further flight.’’ The FAA is aware that only one of these airplanes is currently in operation, and it is a test bed airplane that is not used for revenue flights. This proposed AD requires operators to inspect and modify, as required, in accordance with a method approved by the Manager, Seattle ACO, within 120 days. Costs of Compliance We estimate that this proposed AD affects 61 airplanes of U.S. registry. We estimate the following costs to comply with this proposed AD: The service information specifies to contact the manufacturer for ESTIMATED COSTS Action Labor cost Inspection and test ....... 166 work-hours × $85 per hour = $14,110 per inspection cycle. In addition, we have received no definitive data that would enable us to provide cost estimates for the actions that would be required for Group 1 airplanes. Parts cost $0 Cost per product $14,110 per inspection cycle. We estimate the following costs to do any necessary related investigative actions, repairs, and installations that would be required based on the results of the proposed inspection and test. We Cost on U.S. operators $860,710 per inspection cycle. have no way of determining the number of aircraft that might need these actions: ON-CONDITION COSTS Labor cost Parts cost Cost per product Related investigative actions, repair, installation .............. pmangrum on DSK3VPTVN1PROD with PROPOSALS-1 Action 173 work-hours × $85 per hour = $14,705 ...................... $0 $14,705 According to the manufacturer, some of the costs of this proposed AD may be covered under warranty, thereby reducing the cost impact on affected individuals. We do not control warranty coverage for affected individuals. As a result, we have included all costs in our cost estimate. 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 VerDate Mar<15>2010 15:11 Jun 01, 2012 Jkt 226001 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 PO 00000 Frm 00004 Fmt 4702 Sfmt 4702 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 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 E:\FR\FM\04JNP1.SGM 04JNP1 32920 Federal Register / Vol. 77, No. 107 / Monday, June 4, 2012 / Proposed Rules distribution of power and responsibilities among the various levels of government. For the reasons discussed above, I certify this proposed regulation: (1) Is not a ‘‘significant regulatory action’’ under Executive Order 12866, (2) Is not a ‘‘significant rule’’ under the DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979), (3) Will not affect intrastate aviation in Alaska, and (4) 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. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Incorporation by reference, 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 FAA amends § 39.13 by adding the following new airworthiness directive (AD): The Boeing Company: Docket No. FAA– 2012–0491; Directorate Identifier 2011– NM–265–AD. (a) Comments Due Date We must receive comments by July 19, 2012. (b) Affected ADs None. pmangrum on DSK3VPTVN1PROD with PROPOSALS-1 (c) Applicability This AD applies to The Boeing Company Model 737–100, –200, and 200C series airplanes; certificated in any category; as identified in Boeing Special Attention Service Bulletin 737–53–1313, dated November 3, 2011. (d) Subject Joint Aircraft System Component (JASC)/ Air Transport Association (ATA) of America Code 53; Fuselage. (e) Unsafe Condition This AD was prompted by a report of a severed upper butt strap, and cracks in the forward skin and bonded doubler, on one airplane. We are issuing this AD to prevent cracks at the adjacent mating skins (forward and aft), which could initiate just above VerDate Mar<15>2010 15:11 Jun 01, 2012 Jkt 226001 stringers S–4R and S–4L; and could grow and result in a decompression event. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Actions for Group 1 Airplanes For Group 1 airplanes, as identified in Boeing Special Attention Service Bulletin 737–53–1313, dated November 3, 2011: Within 120 days after the effective date of this AD, inspect and modify, as required, using a method approved in accordance with the procedures specified in paragraph (k) of this AD. (h) Actions for Groups 2 and 3 Airplanes For Groups 2 and 3 airplanes, as identified in Boeing Special Attention Service Bulletin 737–53–1313, dated November 3, 2011: Except as provided by paragraph (i)(1) of this AD, at the applicable times identified in paragraph 1.E., ‘‘Compliance,’’ of Boeing Special Attention Service Bulletin 737–53– 1313, dated November 3, 2011, do the actions specified in paragraphs (h)(1) and (h)(2) of this AD, in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 737–53– 1313, dated November 3, 2011, except as provided by paragraph (i)(2) of this AD. (1) Do one of the inspection options identified in paragraphs (h)(1)(i), (h)(1)(ii), and (h)(1)(iii) of this AD; and do all applicable related investigative and corrective actions. Do all applicable related investigative and corrective actions before further flight. (i) Inspection Option 1: Do a detailed inspection for cracks of the station (STA) 908 forward and aft skin. Thereafter, repeat the inspection at intervals not to exceed 500 flight cycles until the chemical spot test required by paragraph (h)(2) of this AD is done. (ii) Inspection Option 2: Do a one-time external low-frequency eddy current (LFEC) inspection for cracks of the STA 908 upper butt strap. (iii) Inspection Option 3: Do a one-time internal LFEC inspection for cracks of the STA 908 upper butt strap. (2) Do a chemical spot test of the STA 908 upper butt strap to determine the part material, and do all applicable related investigative and corrective actions. Do all applicable related investigative and corrective actions at the times specified in paragraph 1.E., ‘‘Compliance,’’ of Boeing Special Attention Service Bulletin 737–53– 1313, dated November 3, 2011, except as provided by paragraph (i)(1) of this AD. Confirming the upper butt strap is made from 2000 series aluminum terminates the inspections required by paragraph (h)(1) of this AD. (i) Exceptions to the Service Information (1) Where Boeing Special Attention Service Bulletin 737–53–1313, dated November 3, 2011, specifies a compliance time ‘‘after the original issue date of the service bulletin,’’ this AD requires compliance within the specified compliance time after the effective date of this AD. PO 00000 Frm 00005 Fmt 4702 Sfmt 4702 (2) Where Boeing Special Attention Service Bulletin 737–53–1313, dated November 3, 2011, specifies to contact Boeing for repair instructions: Before further flight, repair using a method approved in accordance with the procedures specified in paragraph (k) of this AD. (j) Terminating Action Replacing the STA 908 upper butt strap and doing all applicable related investigative and corrective actions, in accordance with Part 4, Part 5, and Part 6, in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 737–53– 1313, dated November 3, 2011, except as provided by paragraph (i)(2) of this AD, terminates the inspections and chemical spot test required by this AD. (k) Alternative Methods of Compliance (AMOCs) (1) The Manager, Seattle Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the ACO, send it to the attention of the person identified in the Related Information section of this AD. Information may be emailed to: 9-ANMSeattle-ACO-AMOC-Requests@faa.gov. (2) Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/ certificate holding district office. (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 the Boeing Commercial Airplanes Organization Designation Authorization (ODA) that 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. (l) Related Information (1) For more information about this AD, contact Wayne Lockett, Aerospace Engineer, Airframe Branch, ANM–120S, FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue SW., Renton, Washington 98057– 3356; phone: (425) 917–6447; fax: (425) 917– 6590; email: wayne.lockett@faa.gov. (2) For service information identified in this AD, contact Boeing Commercial Airplanes, Attention: Data & Services Management, P.O. Box 3707, MC 2H–65, Seattle, Washington 98124–2207; telephone 206–544–5000, extension 1; fax 206–766– 5680; email me.boecom@boeing.com; Internet https://www.myboeingfleet.com. You may also review the referenced service information in the docket at www.regulations.gov (refer to Docket No. FAA–2012–0491. You may review copies of the referenced service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington. For information on the availability of this material at the FAA, call (425) 227–1221. E:\FR\FM\04JNP1.SGM 04JNP1 Federal Register / Vol. 77, No. 107 / Monday, June 4, 2012 / Proposed Rules Issued in Renton, Washington, on May 18, 2012. Michael Kaszycki, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 2012–13439 Filed 6–1–12; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 71 [Docket No. FAA–2012–0384; Airspace Docket No. 12–ANM–9] Proposed Amendment of Class D and E Airspace; Lewiston, ID Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: This action proposes to modify Class E airspace at Lewiston-Nez Perce County Airport, Lewiston, ID. Controlled airspace is necessary to accommodate aircraft using Area Navigation (RNAV) Global Positioning System (GPS) standard instrument approach procedures at Lewiston-Nez Perce County Airport, Lewiston, ID. The geographic coordinates of the airport and navigation aids also would be adjusted in the respective Class D and Class E airspace areas. The FAA is proposing this action to enhance the safety and management of aircraft operations at Lewiston-Nez Perce County Airport, Lewiston, ID. DATES: Comments must be received on or before July 19, 2012. ADDRESSES: Send comments on this proposal to the U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue SE., Washington, DC 20590; telephone (202) 366–9826. You must identify FAA Docket No. FAA–2012–0384; Airspace Docket No. 12–ANM–9, at the beginning of your comments. You may also submit comments through the Internet at https://www.regulations.gov. FOR FURTHER INFORMATION CONTACT: Eldon Taylor, Federal Aviation Administration, Operations Support Group, Western Service Center, 1601 Lind Avenue SW., Renton, WA 98057; telephone (425) 203–4537. SUPPLEMENTARY INFORMATION: pmangrum on DSK3VPTVN1PROD with PROPOSALS-1 SUMMARY: Comments Invited Interested parties are invited to participate in this proposed rulemaking by submitting such written data, views, VerDate Mar<15>2010 15:11 Jun 01, 2012 Jkt 226001 or arguments, as they may desire. Comments that provide the factual basis supporting the views and suggestions presented are particularly helpful in developing reasoned regulatory decisions on the proposal. Comments are specifically invited on the overall regulatory, aeronautical, economic, environmental, and energy-related aspects of the proposal. Communications should identify both docket numbers (FAA Docket No. FAA 2012–0384 and Airspace Docket No. 12– ANM–9) and be submitted in triplicate to the Docket Management System (see ADDRESSES section for address and phone number). You may also submit comments through the Internet at https://www.regulations.gov. Commenters wishing the FAA to acknowledge receipt of their comments on this action must submit with those comments a self-addressed stamped postcard on which the following statement is made: ‘‘Comments to FAA Docket No. FAA–2012–0384 and Airspace Docket No. 12–ANM–9’’. The postcard will be date/time stamped and returned to the commenter. All communications received on or before the specified closing date for comments will be considered before taking action on the proposed rule. The proposal contained in this action may be changed in light of comments received. All comments submitted will be available for examination in the public docket both before and after the closing date for comments. A report summarizing each substantive public contact with FAA personnel concerned with this rulemaking will be filed in the docket. Availability of NPRMs An electronic copy of this document may be downloaded through the Internet at https://www.regulations.gov. Recently published rulemaking documents can also be accessed through the FAA’s Web page at https:// www.faa.gov/airports_airtraffic/ air_traffic/publications/ airspace_amendments/. You may review the public docket containing the proposal, any comments received, and any final disposition in person in the Dockets Office (see the ADDRESSES section for the 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 Northwest Mountain Regional Office of the Federal Aviation Administration, Air Traffic Organization, Western Service Center, Operations Support Group, 1601 Lind Avenue SW., Renton, WA 98057. PO 00000 Frm 00006 Fmt 4702 Sfmt 4702 32921 Persons interested in being placed on a mailing list for future NPRMs should contact the FAA’s Office of Rulemaking, (202) 267–9677, for a copy of Advisory Circular No. 11–2A, Notice of Proposed Rulemaking Distribution System, which describes the application procedure. The Proposal The FAA is proposing an amendment to Title 14 Code of Federal Regulations (14 CFR) Part 71 by modifying Class E airspace extending upward from 700 feet above the surface at Lewiston-Nez Perce County Airport, Lewiston, ID, to accommodate aircraft using RNAV (GPS) standard instrument approach procedures at the airport. Also, the geographic coordinates of the airport, the Nez Perce VOR/DME, and the Lewiston-Nez Perce ILS Localizer navigation aids, would be updated to coincide with the FAA’s aeronautical database for the respective Class D airspace and Class E airspace areas. This action would enhance the safety and management of aircraft operations at Lewiston-Nez Perce County Airport, Lewiston, ID. Class D and E airspace designations are published in paragraphs 5000, 6002, 6004, and 6005, respectively, of FAA Order 7400.9V, dated August 9, 2011, and effective September 15, 2011, which is incorporated by reference in 14 CFR Part 71.1. The Class D and E airspace designations listed in this document will be published subsequently in this Order. The FAA has determined this proposed regulation only involves an established body of technical regulations for which frequent and routine amendments are necessary to keep them operationally current. Therefore, this proposed regulation: (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) does not warrant preparation of a regulatory evaluation as the anticipated impact is so minimal. Since this is a routine matter that will only affect air traffic procedures and air navigation, it is certified this proposed rule, when promulgated, would not have a significant economic impact on a substantial number of small entities under the criteria of the Regulatory Flexibility Act. The FAA’s authority to issue rules regarding aviation safety is found in Title 49 of the U.S. Code. Subtitle 1, Section 106, describes the authority for the FAA Administrator. Subtitle VII, Aviation Programs, describes in more detail the scope of the agency’s E:\FR\FM\04JNP1.SGM 04JNP1

Agencies

[Federal Register Volume 77, Number 107 (Monday, June 4, 2012)]
[Proposed Rules]
[Pages 32918-32921]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2012-13439]


=======================================================================
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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2012-0491; Directorate Identifier 2011-NM-265-AD]
RIN 2120-AA64


Airworthiness Directives; The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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

SUMMARY: We propose to adopt a new airworthiness directive (AD) for 
certain The Boeing Company Model 737-100, -200, and -200C series 
airplanes. This proposed AD was prompted by a report of a severed upper 
butt strap, and cracks in the forward skin and bonded doubler, on one 
airplane. This proposed AD would require repetitive inspections for 
cracks and a chemical spot test in the area of station (STA) 908, and 
related investigative and corrective actions, if necessary. For certain 
airplanes, this proposed AD would require an inspection and 
modification. We are proposing this AD to prevent cracks at the 
adjacent mating skins (forward and aft), which could initiate just 
above stringers S-4R and S-4L; and could grow and result in a 
decompression event.

DATES: We must receive comments on this proposed AD by July 19, 2012.

ADDRESSES: You may send comments, using the procedures found in 14 CFR 
11.43 and 11.45, 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: Deliver to Mail address above between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
    For service information identified in this proposed AD, contact 
Boeing Commercial Airplanes, Attention: Data & Services Management, 
P.O. Box 3707, MC 2H-65, Seattle, Washington 98124-2207; telephone 206-
544-5000, extension 1; fax 206-766-5680; email me.boecom@boeing.com; 
Internet https://www.myboeingfleet.com. You may review copies of the 
referenced service information at the FAA, Transport Airplane 
Directorate, 1601 Lind Avenue SW., Renton, Washington 98057-3356. For 
information on the availability of this material at the FAA, call (425) 
227-1221.

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 (phone: 800-647-5527) is in the ADDRESSES 
section. Comments will be available in the AD docket shortly after 
receipt.

FOR FURTHER INFORMATION CONTACT: Wayne Lockett, Aerospace Engineer, 
Airframe Branch, ANM-120S, FAA, Seattle Aircraft Certification Office, 
1601 Lind Avenue SW., Renton, Washington 98057-3356; phone: (425) 917-
6447; fax: (425) 917-6590; email: wayne.lockett@faa.gov.

SUPPLEMENTARY INFORMATION: 

Comments Invited

    We invite you to send any written relevant data, views, or 
arguments about this proposal. Send your comments to an address listed 
under the ADDRESSES section. Include ``Docket No. FAA-2012-0491; 
Directorate Identifier 2011-NM-265-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 received a report of a severed upper butt strap, and cracks in 
the forward skin and bonded doubler, on

[[Page 32919]]

one airplane. Lab analysis of the upper butt strap identified 7075-T6 
alloy, instead of the required 2024-T3 clad material. The airplane had 
accumulated approximately 61,000 total flight cycles and 58,000 total 
flight hours. The skin crack was found just above a previously 
installed lap joint modification. Such cracks, if not detected and 
corrected, could result in cracks at the adjacent mating skins (forward 
and aft), which could initiate just above stringers S-4R and S-4L; and 
could grow and result in a decompression event.

Relevant Service Information

    We reviewed Boeing Special Attention Service Bulletin 737-53-1313, 
dated November 3, 2011. For information on the procedures and 
compliance times, see this service information at https://www.regulations.gov by searching for Docket No. FAA-2012-0491.

FAA's Determination

    We are proposing this AD because we evaluated all the relevant 
information and determined the unsafe condition described previously is 
likely to exist or develop in other products of the same type design.

Proposed AD Requirements

    This proposed AD would require repetitive inspections (detailed, 
external low frequency eddy current (LFEC), or internal LFEC) for 
cracks and a chemical spot test in the area of STA 908, and related 
investigative and corrective actions, if necessary. Related 
investigative actions include a detailed inspection for corrosion of 
the skin, skin doubler, and lower butt strap; an open-hole high 
frequency eddy current (HFEC) inspection for cracks of the skin, skin 
doubler, lower butt strap, and stringer splices; and an open-hole HFEC 
for cracks of the STA 908 upper butt strap. Corrective actions involve 
repairing, installing a new stringer splice; and installing a new STA 
908 upper butt strap.
    For airplanes having line numbers 1 through 291, this proposed AD 
would require actions (inspection and modification) done in accordance 
with a method approved by the Manager, Seattle Aircraft Certification 
Office (ACO).

Differences Between the Proposed AD and the Service Information

    The service information 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:
     In accordance with a method that we approve; or
     Using data that meet the certification basis of the 
airplane, and that have been approved by the Boeing Commercial 
Airplanes Organization Designation Authorization (ODA) whom we have 
authorized to make those findings.
    In addition, Boeing has not provided specific procedures for 
airplanes having line numbers 1 through 291, but indicates to contact 
Boeing for instructions ``before further flight.'' The FAA is aware 
that only one of these airplanes is currently in operation, and it is a 
test bed airplane that is not used for revenue flights. This proposed 
AD requires operators to inspect and modify, as required, in accordance 
with a method approved by the Manager, Seattle ACO, within 120 days.

Costs of Compliance

    We estimate that this proposed AD affects 61 airplanes of U.S. 
registry.
    We estimate the following costs to comply with this proposed AD:

                                                                     Estimated Costs
--------------------------------------------------------------------------------------------------------------------------------------------------------
                Action                            Labor cost            Parts cost      Cost per product                Cost on U.S. operators
--------------------------------------------------------------------------------------------------------------------------------------------------------
Inspection and test...................  166 work-hours x $85 per hour           $0  $14,110 per inspection    $860,710 per inspection cycle.
                                         = $14,110 per inspection                    cycle.
                                         cycle.
--------------------------------------------------------------------------------------------------------------------------------------------------------

    In addition, we have received no definitive data that would enable 
us to provide cost estimates for the actions that would be required for 
Group 1 airplanes.
    We estimate the following costs to do any necessary related 
investigative actions, repairs, and installations that would be 
required based on the results of the proposed inspection and test. We 
have no way of determining the number of aircraft that might need these 
actions:

                                               On-Condition Costs
----------------------------------------------------------------------------------------------------------------
                                                                                                      Cost per
                    Action                                   Labor cost                Parts cost      product
----------------------------------------------------------------------------------------------------------------
Related investigative actions, repair,         173 work-hours x $85 per hour =                 $0       $14,705
 installation.                                  $14,705.
----------------------------------------------------------------------------------------------------------------

    According to the manufacturer, some of the costs of this proposed 
AD may be covered under warranty, thereby reducing the cost impact on 
affected individuals. We do not control warranty coverage for affected 
individuals. As a result, we have included all costs in our cost 
estimate.

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 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

[[Page 32920]]

distribution of power and responsibilities among the various levels of 
government.
    For the reasons discussed above, I certify this proposed 
regulation:
    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866,
    (2) Is not a ``significant rule'' under the DOT Regulatory Policies 
and Procedures (44 FR 11034, February 26, 1979),
    (3) Will not affect intrastate aviation in Alaska, and
    (4) 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.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, 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 FAA amends Sec.  39.13 by adding the following new 
airworthiness directive (AD):

The Boeing Company: Docket No. FAA-2012-0491; Directorate Identifier 
2011-NM-265-AD.

(a) Comments Due Date

    We must receive comments by July 19, 2012.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to The Boeing Company Model 737-100, -200, and 
200C series airplanes; certificated in any category; as identified 
in Boeing Special Attention Service Bulletin 737-53-1313, dated 
November 3, 2011.

(d) Subject

    Joint Aircraft System Component (JASC)/Air Transport Association 
(ATA) of America Code 53; Fuselage.

(e) Unsafe Condition

    This AD was prompted by a report of a severed upper butt strap, 
and cracks in the forward skin and bonded doubler, on one airplane. 
We are issuing this AD to prevent cracks at the adjacent mating 
skins (forward and aft), which could initiate just above stringers 
S-4R and S-4L; and could grow and result in a decompression event.

(f) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

(g) Actions for Group 1 Airplanes

    For Group 1 airplanes, as identified in Boeing Special Attention 
Service Bulletin 737-53-1313, dated November 3, 2011: Within 120 
days after the effective date of this AD, inspect and modify, as 
required, using a method approved in accordance with the procedures 
specified in paragraph (k) of this AD.

(h) Actions for Groups 2 and 3 Airplanes

    For Groups 2 and 3 airplanes, as identified in Boeing Special 
Attention Service Bulletin 737-53-1313, dated November 3, 2011: 
Except as provided by paragraph (i)(1) of this AD, at the applicable 
times identified in paragraph 1.E., ``Compliance,'' of Boeing 
Special Attention Service Bulletin 737-53-1313, dated November 3, 
2011, do the actions specified in paragraphs (h)(1) and (h)(2) of 
this AD, in accordance with the Accomplishment Instructions of 
Boeing Special Attention Service Bulletin 737-53-1313, dated 
November 3, 2011, except as provided by paragraph (i)(2) of this AD.
    (1) Do one of the inspection options identified in paragraphs 
(h)(1)(i), (h)(1)(ii), and (h)(1)(iii) of this AD; and do all 
applicable related investigative and corrective actions. Do all 
applicable related investigative and corrective actions before 
further flight.
    (i) Inspection Option 1: Do a detailed inspection for cracks of 
the station (STA) 908 forward and aft skin. Thereafter, repeat the 
inspection at intervals not to exceed 500 flight cycles until the 
chemical spot test required by paragraph (h)(2) of this AD is done.
    (ii) Inspection Option 2: Do a one-time external low-frequency 
eddy current (LFEC) inspection for cracks of the STA 908 upper butt 
strap.
    (iii) Inspection Option 3: Do a one-time internal LFEC 
inspection for cracks of the STA 908 upper butt strap.
    (2) Do a chemical spot test of the STA 908 upper butt strap to 
determine the part material, and do all applicable related 
investigative and corrective actions. Do all applicable related 
investigative and corrective actions at the times specified in 
paragraph 1.E., ``Compliance,'' of Boeing Special Attention Service 
Bulletin 737-53-1313, dated November 3, 2011, except as provided by 
paragraph (i)(1) of this AD. Confirming the upper butt strap is made 
from 2000 series aluminum terminates the inspections required by 
paragraph (h)(1) of this AD.

(i) Exceptions to the Service Information

    (1) Where Boeing Special Attention Service Bulletin 737-53-1313, 
dated November 3, 2011, specifies a compliance time ``after the 
original issue date of the service bulletin,'' this AD requires 
compliance within the specified compliance time after the effective 
date of this AD.
    (2) Where Boeing Special Attention Service Bulletin 737-53-1313, 
dated November 3, 2011, specifies to contact Boeing for repair 
instructions: Before further flight, repair using a method approved 
in accordance with the procedures specified in paragraph (k) of this 
AD.

(j) Terminating Action

    Replacing the STA 908 upper butt strap and doing all applicable 
related investigative and corrective actions, in accordance with 
Part 4, Part 5, and Part 6, in accordance with the Accomplishment 
Instructions of Boeing Special Attention Service Bulletin 737-53-
1313, dated November 3, 2011, except as provided by paragraph (i)(2) 
of this AD, terminates the inspections and chemical spot test 
required by this AD.

(k) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, Seattle Aircraft Certification Office (ACO), 
FAA, has the authority to approve AMOCs for this AD, if requested 
using the procedures found in 14 CFR 39.19. In accordance with 14 
CFR 39.19, send your request to your principal inspector or local 
Flight Standards District Office, as appropriate. If sending 
information directly to the manager of the ACO, send it to the 
attention of the person identified in the Related Information 
section of this AD. Information may be emailed to: 9-ANM-Seattle-ACO-AMOC-Requests@faa.gov.
    (2) Before using any approved AMOC, notify your appropriate 
principal inspector, or lacking a principal inspector, the manager 
of the local flight standards district office/certificate holding 
district office.
    (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 the 
Boeing Commercial Airplanes Organization Designation Authorization 
(ODA) that 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.

(l) Related Information

    (1) For more information about this AD, contact Wayne Lockett, 
Aerospace Engineer, Airframe Branch, ANM-120S, FAA, Seattle Aircraft 
Certification Office, 1601 Lind Avenue SW., Renton, Washington 
98057-3356; phone: (425) 917-6447; fax: (425) 917-6590; email: 
wayne.lockett@faa.gov.
    (2) For service information identified in this AD, contact 
Boeing Commercial Airplanes, Attention: Data & Services Management, 
P.O. Box 3707, MC 2H-65, Seattle, Washington 98124-2207; telephone 
206-544-5000, extension 1; fax 206-766-5680; email 
me.boecom@boeing.com; Internet https://www.myboeingfleet.com. You 
may also review the referenced service information in the docket at 
www.regulations.gov (refer to Docket No. FAA-2012-0491. You may 
review copies of the referenced service information at the FAA, 
Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, 
Washington. For information on the availability of this material at 
the FAA, call (425) 227-1221.


[[Page 32921]]


    Issued in Renton, Washington, on May 18, 2012.
Michael Kaszycki,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2012-13439 Filed 6-1-12; 8:45 am]
BILLING CODE 4910-13-P

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