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still be done as specified, and the airplane ADDRESSES: You may send comments, section. Include ‘‘Docket No. FAA– can be put back in an airworthy condition. using the procedures found in 14 CFR 2016–6901; Directorate Identifier 2015– (k) Related Information 11.43 and 11.45, by any of the following NM–192–AD’’ at the beginning of your methods: comments. We specifically invite (1) For more information about this AD, • contact Nathan Weigand, Aerospace Federal eRulemaking Portal: Go to comments on the overall regulatory, Engineer, Branch, ANM–120S, http://www.regulations.gov. Follow the economic, environmental, and energy FAA, Seattle Certification Office instructions for submitting comments. aspects of this proposed AD. We will (ACO), 1601 Lind Avenue SW., Renton, WA • Fax: 202–493–2251. consider all comments received by the 98057–3356; phone: 425–917–6428; fax: 425– • Mail: U.S. Department of closing date and may amend this 917–6590; email: [email protected]. Transportation, Docket Operations, M– proposed AD because of those (2) For service information identified in 30, West Building Ground Floor, Room comments. this AD, contact Boeing Commercial W12–140, 1200 New Jersey Avenue SE., We will post all comments we Airplanes, Attention: Data & Services Washington, DC 20590. receive, without change, to http:// Management, P.O. Box 3707, MC 2H–65, • www.regulations.gov, including any Seattle, WA 98124–2207; telephone 206– Hand Delivery: Deliver to Mail 544–5000, extension 1; fax 206–766–5680; address above between 9 a.m. and 5 personal information you provide. We Internet https://www.myboeingfleet.com. You p.m., Monday through Friday, except will also post a report summarizing each may view this referenced service information Federal holidays. substantive verbal contact we receive at the FAA, the FAA, Transport Airplane For service information identified in about this proposed AD. Directorate, 1601 Lind Avenue SW., Renton, this NPRM, contact Boeing Commercial Discussion WA. For information on the availability of Airplanes, Attention: Data & Services this material at the FAA, call 425–227–1221. Management, P.O. Box 3707, MC 2H–65, Fatigue damage can occur locally, in Issued in Renton, Washington, on June 3, Seattle, WA 98124–2207; telephone small areas or structural design details, 2016. 206–544–5000, extension 1; fax 206– or globally, in widespread areas. Michael Kaszycki, 766–5680; Internet https:// Multiple-site damage is widespread damage that occurs in a large structural Acting Manager, Transport Airplane www.myboeingfleet.com. You may view Directorate, Aircraft Certification Service. this referenced service information at element such as a single rivet line of a the FAA, Transport Airplane lap splice joining two large skin panels. [FR Doc. 2016–14293 Filed 6–20–16; 8:45 am] Widespread damage can also occur in BILLING CODE 4910–13–P Directorate, 1601 Lind Avenue SW., Renton, WA. For information on the multiple elements such as adjacent availability of this material at the FAA, frames or stringers. Multiple-site DEPARTMENT OF TRANSPORTATION call 425–227–1221. It is also available damage and multiple-element damage on the Internet at http:// cracks are typically too small initially to Federal Aviation Administration www.regulations.gov by searching for be reliably detected with normal and locating Docket No. FAA–2016– inspection methods. Without intervention, these cracks will grow, 14 CFR Part 39 6901. and eventually compromise the [Docket No. FAA–2016–6901; Directorate Examining the AD Docket structural integrity of the airplane. This Identifier 2015–NM–192–AD] You may examine the AD docket on condition is known as widespread RIN 2120–AA64 the Internet at http:// fatigue damage. It is associated with www.regulations.gov by searching for general degradation of large areas of Airworthiness Directives; The Boeing and locating Docket No. FAA–2016– structure with similar structural details Company Airplanes 6901; or in person at the Docket and stress levels. As an airplane ages, Management Facility between 9 a.m. WFD will likely occur, and will AGENCY: Federal Aviation certainly occur if the airplane is Administration (FAA), DOT. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket operated long enough without any ACTION: Notice of proposed rulemaking contains this proposed AD, the intervention. (NPRM). The FAA’s WFD final rule (75 FR regulatory evaluation, any comments 69746, November 15, 2010) became received, and other information. The SUMMARY: We propose to adopt a new effective on January 14, 2011. The WFD street address for the Docket Office airworthiness directive (AD) for certain rule requires certain actions to prevent (phone: 800–647–5527) is in the The Boeing Company Model 737–600, structural failure due to WFD ADDRESSES section. Comments will be –700, –700C, –800, and –900 series throughout the operational life of available in the AD docket shortly after airplanes. This proposed AD was certain existing transport category receipt. prompted by an evaluation by the airplanes and all of these airplanes that design approval holder (DAH) FOR FURTHER INFORMATION CONTACT: will be certificated in the future. For indicating that the aft pressure bulkhead Alan Pohl, Aerospace Engineer, existing and future airplanes subject to is subject to widespread fatigue damage Airframe Branch, ANM–120S, FAA, the WFD rule, the rule requires that (WFD). This proposed AD would Seattle Aircraft Certification Office DAHs establish a limit of validity (LOV) require repetitive inspections of the aft (ACO), 1601 Lind Avenue SW., Renton, of the engineering data that support the pressure bulkhead web for any cracking, WA 98057–3356; phone: 425–917–6450; structural maintenance program. crack indications, discrepant fastener fax: 425–917–6590; email: Alan.Pohl@ Operators affected by the WFD rule may holes, and corrosion; and corrective faa.gov. not fly an airplane beyond its LOV, actions if necessary. We are proposing SUPPLEMENTARY INFORMATION: unless an extended LOV is approved. this AD to detect and correct cracks in The WFD rule (75 FR 69746, the aft pressure bulkhead web, which Comments Invited November 15, 2010) does not require could result in an uncontrolled We invite you to send any written identifying and developing maintenance decompression of the . relevant data, views, or arguments about actions if the DAHs can show that such DATES: We must receive comments on this proposal. Send your comments to actions are not necessary to prevent this proposed AD by August 5, 2016. an address listed under the ADDRESSES WFD before the airplane reaches the

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LOV. Many LOVs, however, do depend uncontrolled decompression of the ‘‘Differences Between this Proposed AD on accomplishment of future fuselage. and the Service Information.’’ maintenance actions. As stated in the The phrase ‘‘corrective actions’’ is Related Service Information Under 1 used in this NPRM. Corrective actions WFD rule, any maintenance actions CFR Part 51 necessary to reach the LOV will be correct or address any condition found. mandated by airworthiness directives We reviewed Boeing Alert Service Corrective actions in an AD could through separate rulemaking actions. In Bulletin 737–53A1248, Revision 2, include, for example, repairs. the context of WFD, this action is dated October 14, 2015. The service information describes procedures for Differences Between This Proposed AD necessary to enable DAHs to propose and the Service Information LOVs that allow operators the longest low frequency eddy current, or high operational lives for their airplanes, and frequency eddy current, and detailed Boeing Alert Service Bulletin 737– still ensure that WFD will not occur. inspections of the bulkhead web for 53A1248, Revision 2, dated October 14, This approach allows for an cracking, crack indications, discrepant 2015, specifies to contact the implementation strategy that provides fastener holes, and corrosion. This manufacturer for instructions on how to flexibility to DAHs in determining the service information is reasonably repair certain conditions, but this timing of service information available because the interested parties proposed AD would require repairing development (with FAA approval), have access to it through their normal those conditions in one of the following while providing operators with certainty course of business or by the means ways: ADDRESSES • In accordance with a method that regarding the LOV applicable to their identified in the section. we approve; or airplanes. FAA’s Determination • Using data that meet the Analysis by the DAH has determined We are proposing this AD because we certification basis of the airplane, and that the aft pressure bulkhead web at the evaluated all the relevant information that have been approved by the Boeing Y chord is susceptible to WFD for and determined the unsafe condition Commercial Airplanes Organization certain Model 737–600, –700, –700C, described previously is likely to exist or Designation Authorization (ODA) whom –800, and –900 series airplanes. This develop in other products of these same we have authorized to make those analysis indicates that the repetitive type designs. findings. inspection intervals mandated by AD 2005–21–06, Amendment 39–14344 (70 Proposed AD Requirements Costs of Compliance FR 61226, October 21, 2005), should be This proposed AD would require We estimate that this proposed AD reduced at the WFD threshold to detect accomplishing the actions specified in affects 680 airplanes of U.S. registry. cracking due to WFD. This cracking, if the service information described We estimate the following costs to left undetected, could result in an previously, except as discussed under comply with this proposed AD:

ESTIMATED COSTS

Action Labor cost Cost per product Cost on U.S. operators

Inspections ...... 34 work-hours × $85 per hour = $2,890 per inspection cycle $2,890 per inspection cycle ... $1,965,200 per inspection cycle.

We have received no definitive data products identified in this rulemaking under the criteria of the Regulatory that would enable us to provide cost action. Flexibility Act. estimates for the on-condition actions Regulatory Findings specified in this proposed AD. List of Subjects in 14 CFR Part 39 We determined that this proposed AD Air transportation, Aircraft, Aviation Authority for This Rulemaking would not have federalism implications safety, Incorporation by reference, Title 49 of the United States Code under Executive Order 13132. This Safety. specifies the FAA’s authority to issue proposed AD would not have a rules on aviation safety. Subtitle I, substantial direct effect on the States, on The Proposed Amendment section 106, describes the authority of the relationship between the national the FAA Administrator. Subtitle VII: Government and the States, or on the Accordingly, under the authority Aviation Programs, describes in more distribution of power and delegated to me by the Administrator, detail the scope of the Agency’s responsibilities among the various the FAA proposes to amend 14 CFR part authority. levels of government. 39 as follows: We are issuing this rulemaking under For the reasons discussed above, I the authority described in Subtitle VII, certify this proposed regulation: PART 39—AIRWORTHINESS Part A, Subpart III, Section 44701: (1) Is not a ‘‘significant regulatory DIRECTIVES ‘‘General requirements.’’ Under that action’’ under Executive Order 12866, section, Congress charges the FAA with (2) Is not a ‘‘significant rule’’ under ■ 1. The authority citation for part 39 promoting safe flight of civil aircraft in the DOT Regulatory Policies and continues to read as follows: air commerce by prescribing regulations Procedures (44 FR 11034, February 26, Authority: 49 U.S.C. 106(g), 40113, 44701. for practices, methods, and procedures 1979), the Administrator finds necessary for (3) Will not affect intrastate aviation § 39.13 [Amended] safety in air commerce. This regulation in Alaska, and is within the scope of that authority (4) Will not have a significant ■ 2. The FAA amends § 39.13 by adding because it addresses an unsafe condition economic impact, positive or negative, the following new airworthiness that is likely to exist or develop on on a substantial number of small entities directive (AD):

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The Boeing Company: Docket No. FAA– (ii) On areas that are not repaired, repeat Issued in Renton, Washington, on June 3, 2016–6901; Directorate Identifier 2015– the inspections thereafter at the applicable 2016. NM–192–AD. times specified in paragraph 1.E., Michael Kaszycki, ‘‘Compliance,’’ of Boeing Alert Service (a) Comments Due Date Acting Manager, Transport Airplane Bulletin 737–53A1248, Revision 2, dated Directorate, Aircraft Certification Service. We must receive comments by August 5, October 14, 2015. 2016. [FR Doc. 2016–14295 Filed 6–20–16; 8:45 am] (h) Terminating Action for AD 2005–21–06 (b) Affected ADs BILLING CODE 4910–13–P Accomplishment of the initial inspections Certain requirements of this AD terminate required by paragraph (g) of this AD certain requirements of AD 2005–21–06, terminates the requirements of AD 2005–21– DEPARTMENT OF TRANSPORTATION Amendment 39–14344 (70 FR 61226, October 06. 21, 2005) (‘‘AD 2005–21–06’’). (i) Credit for Previous Actions Federal Aviation Administration (c) Applicability This paragraph provides credit for the This AD applies to The Boeing Company actions specified in paragraph (g) of this AD, 14 CFR Part 39 Model 737–600, –700, –700C, –800, and –900 if those actions were performed before the [Docket No. FAA–2016–7262; Directorate series airplanes, certificated in any category, effective date of this AD using Boeing Alert Identifier 2015–NM–079–AD] line number 1 through 1755, as identified in Service Bulletin 737–53A1248, dated Boeing Alert Service Bulletin 737–53A1248, September 9, 2004; or Boeing Alert Service RIN 2120–AA64 Revision 2, dated October 14, 2015. Bulletin 737–53A1248, Revision 1, dated (d) Subject September 10, 2007; which are not Airworthiness Directives; incorporated by reference in this AD. Airplanes Air Transport Association (ATA) of America Code 53, Fuselage. (j) Alternative Methods of Compliance AGENCY: Federal Aviation (AMOCs) (e) Unsafe Condition Administration (FAA), DOT. (1) The Manager, Seattle Aircraft ACTION: Notice of proposed rulemaking This AD was prompted by an evaluation by Certification Office (ACO), FAA, has the the design approval holder (DAH) indicating (NPRM). authority to approve AMOCs for this AD, if that the aft pressure bulkhead is subject to requested using the procedures found in 14 widespread fatigue damage (WFD). We are SUMMARY: We propose to supersede CFR 39.19. In accordance with 14 CFR 39.19, issuing this AD to detect and correct cracks send your request to your principal inspector Airworthiness Directive (AD) 98–13–14, in the aft pressure bulkhead web, which or local Flight Standards District Office, as for certain Airbus Model A320–211, could result in an uncontrolled appropriate. If sending information directly –212, and –231 airplanes. AD 98–13–14 decompression of the fuselage. to the manager of the ACO, send it to the currently requires repetitive rotating (f) Compliance attention of the person identified in probe inspections of fastener holes and/ Comply with this AD within the paragraph (k)(1) of this AD. Information may or the adjacent tooling hole of a former compliance times specified, unless already be emailed to: 9-ANM-Seattle-ACO-AMOC- junction of the aft fuselage, as done. [email protected]. applicable, and corrective action, if (2) Before using any approved AMOC, (g) Repetitive Inspections notify your appropriate principal inspector, necessary. AD 98–13–14 also provides for an optional terminating action for At the applicable time specified in or lacking a principal inspector, the manager paragraph 1.E., ‘‘Compliance,’’ of Boeing of the local flight standards district office/ the repetitive inspections. Since we Alert Service Bulletin 737–53A1248, certificate holding district office. issued AD 98–13–14, an evaluation by Revision 2, dated October 14, 2015, or within (3) An AMOC that provides an acceptable the design approval holder (DAH) 18 months after November 25, 2005 (the level of safety may be used for any repair, indicates that the former junction of the effective date of AD 2005–21–06), whichever modification, or alteration required by this aft fuselage is subject to fatigue damage. occurs later: Do a low frequency eddy current AD if it is approved by the Boeing This proposed AD would continue to (LFEC) or high frequency eddy current Commercial Airplanes Organization require the actions in AD 98–13–14, (HFEC) inspection, and a detailed inspection, Designation Authorization (ODA) that has of the aft and forward sides, as applicable, of been authorized by the Manager, Seattle with revised inspection compliance the aft pressure bulkhead web at the Y chord, ACO, to make those findings. To be times. We are proposing this AD to above and below stringer S–15L and stringer approved, the repair method, modification detect and correct fatigue cracks in the S–15R, to detect discrepancies (including deviation, or alteration deviation must meet former junction of the aft fuselage; cracking, crack indications, discrepant the certification basis of the airplane, and the fatigue cracking could propagate and fastener holes, and corrosion), in accordance approval must specifically refer to this AD. could adversely affect the structural with the Accomplishment Instructions of (k) Related Information integrity of the airplane. Boeing Alert Service Bulletin 737–53A1248, Revision 2, dated October 14, 2015. Access (1) For more information about this AD, DATES: We must receive comments on and restoration procedures specified in the contact Alan Pohl, Aerospace Engineer, this proposed AD by August 5, 2016. Accomplishment Instructions of Boeing Alert Airframe Branch, ANM–120S, FAA, Seattle ADDRESSES: You may send comments, Service Bulletin 737–53A1248, Revision 2, Aircraft Certification Office (ACO), 1601 Lind using the procedures found in 14 CFR Avenue SW., Renton, WA 98057–3356; dated October 14, 2015, are not required by 11.43 and 11.45, by any of the following this AD. Operators may do those procedures phone: 425–917–6450; fax: 425–917–6590; email: [email protected]. methods: following their maintenance practices. • (1) If no discrepancy is found: Repeat the (2) For service information identified in Federal eRulemaking Portal: Go to inspections thereafter at the applicable times this AD, contact Boeing Commercial http://www.regulations.gov. Follow the specified in paragraph 1.E., ‘‘Compliance,’’ of Airplanes, Attention: Data & Services instructions for submitting comments. Boeing Alert Service Bulletin 737–53A1248, Management, P.O. Box 3707, MC 2H–65, • Fax: 202–493–2251. Revision 2, dated October 14, 2015. Seattle, WA 98124–2207; telephone 206– • Mail: U.S. Department of (2) If any discrepancy is found: Do the 544–5000, extension 1; fax 206–766–5680; Transportation, Docket Operations, M– Internet https://www.myboeingfleet.com. You actions specified in paragraphs (g)(2)(i) and 30, West Building Ground Floor, Room (g)(2)(ii) of this AD. may view this referenced service information (i) Repair the discrepancy before further at the FAA, Transport Airplane Directorate, W12–140, 1200 New Jersey Avenue SE., flight using a method approved in 1601 Lind Avenue SW., Renton, WA. For Washington, DC 20590. accordance with the procedures specified in information on the availability of this • Hand Delivery: U.S. Department of paragraph (j) of this AD. material at the FAA, call 425–227–1221. Transportation, Docket Operations, M–

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