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Requirements Bulletin 737–25–1758 RB, including substeps and identified figures, can 05, which applied to certain The dated November 8, 2017. still be done as specified, and the airplane Company Model 737–600, –700, –700C, Note 1 to paragraph (g)(2) of this AD: can be put back in an airworthy condition. –800, –900, and –900ER series Guidance for accomplishing the actions (j) Related Information airplanes. AD 2017–16–05 required a required by paragraph (g)(2) of this AD can For more information about this AD, one-time detailed visual inspection for be found in Boeing Service Bulletin 737–25– discrepancies in the Krueger 1758, dated November 8, 2017, which is contact Scott Craig, Engineer, referred to in Boeing Requirements Bulletin Cabin Safety and Environmental Systems bullnose attachment hardware, and 737–25–1758 RB, dated November 8, 2017. Section, FAA, Seattle ACO Branch, 2200 related investigative and corrective South 216th St., Des Moines, WA 98198; actions if necessary. This AD adds (h) Exceptions to Service Information phone and fax: 206–231–3566; email: airplanes and an additional inspection [email protected]. Specifications to determine if any Krueger flap no. 1, (1) For purposes of determining (k) Material Incorporated by Reference 2, 3, or 4 has been replaced, and related compliance with the requirements of this AD: (1) The Director of the Federal Register investigative and corrective actions. Where Boeing Service Bulletin 737–25–1728, approved the incorporation by reference Since this is a rotable parts issue, the dated October 10, 2016, uses the phrase ‘‘the (IBR) of the service information listed in this applicability of this AD has been original issue date of this service bulletin,’’ paragraph under 5 U.S.C. 552(a) and 1 CFR this AD requires using ‘‘the effective date of expanded beyond the airplanes listed in part 51. the related service bulletin to include all this AD.’’ (2) You must use this service information (2) For purposes of determining as applicable to do the actions required by airplanes on which a Krueger flap compliance with the requirements of this AD: this AD, unless the AD specifies otherwise. bullnose may be installed. This AD was Where Boeing Requirements Bulletin 737– (i) Boeing Service Bulletin 737–25–1728, prompted by a report of a Krueger flap 25–1758 RB, dated November 8, 2017, uses dated October 10, 2016. bullnose departing an airplane during the phrase ‘‘the original issue date of the (ii) Boeing Requirements Bulletin 737–25– taxi, which caused damage to the Requirements Bulletin (RB),’’ this AD 1758 RB, dated November 8, 2017. structure and thrust reverser, and a requires using ‘‘the effective date of this AD.’’ (3) For service information identified in report of a missing no. 2 Krueger flap this AD, contact Boeing Commercial (i) Alternative Methods of Compliance bullnose hinge bolt from an airplane (AMOCs) Airplanes, Attention: Contractual & Data Services (C&DS), 2600 Westminster Blvd., that was not included in the effectivity (1) The Manager, Seattle ACO Branch, MC 110–SK57, Seal Beach, CA 90740–5600; of AD 2017–16–05. We are issuing this FAA, has the authority to approve AMOCs telephone 562–797–1717; internet https:// AD to address the unsafe condition on for this AD, if requested using the procedures www.myboeingfleet.com. these products. found in 14 CFR 39.19. In accordance with (4) You may view this service information DATES: This AD is effective March 29, 14 CFR 39.19, send your request to your at the FAA, Transport Standards Branch, principal inspector or local Flight Standards 2200 South 216th St., Des Moines, WA. For 2019. District Office, as appropriate. If sending information on the availability of this The Director of the Federal Register information directly to the manager of the material at the FAA, call 206–231–3195. approved the incorporation by reference certification office, send it to the attention of (5) You may view this service information of a certain publication listed in this AD the person identified in paragraph (j) of this that is incorporated by reference at the as of March 29, 2019. AD. Information may be emailed to: 9-ANM- National Archives and Records ADDRESSES: For service information [email protected]. Administration (NARA). For information on (2) Before using any approved AMOC, the availability of this material at NARA, call identified in this final rule, contact notify your appropriate principal inspector, 202–741–6030, or go to: http:// Boeing Commercial Airplanes, or lacking a principal inspector, the manager www.archives.gov/federal-register/cfr/ibr- Attention: Contractual & Data Services of the local flight standards district office/ locations.html. (C&DS), 2600 Westminster Blvd., MC certificate holding district office. 110–SK57, Seal Beach, CA 90740–5600; (3) An AMOC that provides an acceptable Issued in Des Moines, Washington, on February 1, 2019. phone: 562–797–1717; internet: https:// level of safety may be used for any repair, Michael Kaszycki, www.myboeingfleet.com. You may view modification, or alteration required by this this service information at the FAA, AD if it is approved by the Boeing Acting Director, System Oversight Division, Commercial Airplanes Organization Certification Service. Transport Standards Branch, 2200 South 216th St., Des Moines, WA. For Designation Authorization (ODA) that has [FR Doc. 2019–02932 Filed 2–21–19; 8:45 am] been authorized by the Manager, Seattle ACO information on the availability of this BILLING CODE 4910–13–P Branch, FAA, to make those findings. To be material at the FAA, call 206–231–3195. approved, the repair method, modification It is also available on the internet at deviation, or alteration deviation must meet DEPARTMENT OF TRANSPORTATION http://www.regulations.gov by searching the certification basis of the airplane, and the for and locating Docket No. FAA–2018– approval must specifically refer to this AD. Federal Aviation Administration 0409. (4) For service information that contains steps that are labeled as RC, the provisions Examining the AD Docket of paragraphs (i)(4)(i) and (i)(4)(ii) of this AD 14 CFR Part 39 You may examine the AD docket on apply. [Docket No. FAA–2018–0409; Product (i) The steps labeled as RC, including the internet at http:// Identifier 2017–NM–120–AD; Amendment www.regulations.gov by searching for substeps under an RC step and any figures 39–19559; AD 2019–03–07] identified in an RC step, must be done to and locating Docket No. FAA–2018– comply with the AD. If a step or substep is RIN 2120–AA64 0409; or in person at Docket Operations labeled ‘‘RC Exempt,’’ then the RC between 9 a.m. and 5 p.m., Monday requirement is removed from that step or Airworthiness Directives; The Boeing through Friday, except Federal holidays. substep. An AMOC is required for any Company Airplanes The AD docket contains this final rule, deviations to RC steps, including substeps the regulatory evaluation, any and identified figures. AGENCY: Federal Aviation (ii) Steps not labeled as RC may be Administration (FAA), DOT. comments received, and other deviated from using accepted methods in ACTION: Final rule. information. The address for Docket accordance with the operator’s maintenance Operations (phone: 800–647–5527) is or inspection program without obtaining SUMMARY: We are superseding U.S. Department of Transportation, approval of an AMOC, provided the RC steps, Airworthiness Directive (AD) 2017–16– Docket Operations, M–30, West

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Building Ground Floor, Room W12–140, American Airlines (AAL) concurred to specify affected Krueger flap(s) and 1200 New Jersey Avenue SE, with the intent of the NPRM. Krueger flap bullnose(s). DAL stated Washington, DC 20590. that not all four positions need to be Effect of Winglets on Accomplishment inspected, only the Krueger flap(s) and FOR FURTHER INFORMATION CONTACT: of the Proposed Actions Alan Pohl, Aerospace Engineer, Krueger flap bullnose(s) being installed. Aviation Partners Boeing stated that Section, FAA, Seattle ACO AAL suggested that we reword accomplishing the Supplemental Type Branch, 2200 South 216th St., Des paragraph (i) of the proposed AD to Certificate (STC) ST00830SE does not Moines, WA 98198; phone and fax: 206– improve clarity. affect the actions specified in the 231–3527; email: [email protected]. NPRM. We agree with the request because it SUPPLEMENTARY INFORMATION: We concur with the commenter. We is not necessary to perform the actions have redesignated paragraph (c) of the specified in paragraph (i) of this AD on Discussion proposed AD as paragraph (c)(1) of this all four Krueger flap(s) or Krueger flap We issued a notice of proposed AD and added paragraph (c)(2) to this bullnose(s). Only the Krueger flap(s) or rulemaking (NPRM) to amend 14 CFR AD to state that installation of STC Krueger flap bullnose(s) being installed part 39 to supersede AD 2017–16–05, ST00830SE does not affect the ability to must be inspected. We have revised Amendment 39–18982 (82 FR39344, accomplish the actions required by this paragraph (i) of this AD to specify: August 18, 2017) (‘‘AD 2017–16–05’’). AD. Therefore, for airplanes on which ‘‘These actions are required only for the AD 2017–16–05 applied to certain The STC ST00830SE is installed, a ‘‘change Krueger flap(s) or Krueger flap Boeing Company Model 737–600, –700, in product’’ alternative method of bullnose(s) being installed.’’ –700C, –800, –900, and –900ER series compliance (AMOC) approval request is Conclusion airplanes. The NPRM published in the not necessary to comply with the Federal Register on May 15, 2018 (83 requirements of 14 CFR 39.17. We reviewed the relevant data, FR22420). The NPRM was prompted by Request To Remove Airplanes From the considered the comments received, and a report of a Krueger flap bullnose Applicability determined that air safety and the departing an airplane during taxi, which public interest require adopting this AD caused damage to the wing structure All Nippon Airways (ANA) requested with the changes described previously, and thrust reverser, and a report of a that we remove the airplanes identified and minor editorial changes. We have missing no. 2 Krueger flap bullnose in paragraph (c)(3) of the proposed AD. determined that these minor changes: hinge bolt from an airplane that was not ANA stated that those airplanes are not • Are consistent with the intent that included in the effectivity of AD 2017– required to do the actions specified in was proposed in the NPRM for 16–05. The NPRM proposed to continue paragraph (g) of the proposed AD. addressing the unsafe condition; and to require a one-time detailed visual We disagree with the request. inspection for discrepancies in the Although the airplanes identified in • Do not add any additional burden Krueger flap bullnose attachment paragraph (c)(1)(iii) of this AD upon the public than was already hardware, and related investigative and (paragraph (c)(3) of the proposed AD) proposed in the NPRM. corrective actions, if necessary. The are not required to do the actions specified in paragraph (g) of this AD, We also determined that these NPRM also proposed to add airplanes changes will not increase the economic and an additional inspection to those airplanes must still comply with the parts installation limitation burden on any operator or increase the determine if any Krueger flap no. 1, 2, scope of this AD. 3, or 4 has been replaced, and related specified in paragraph (i) of this AD. We investigative and corrective actions. have not changed this AD in this regard. Related Service Information Under 1 Since this is a rotable parts issue, the Request for a Different Method of CFR Part 51 applicability of this AD has been Compliance We reviewed Boeing Alert Service expanded beyond the airplanes listed in DAL requested that we include an the related service bulletin to include all Bulletin 737–57A1327, Revision 2, option in paragraph (i) of the proposed dated July 25, 2017. This service airplanes on which a Krueger flap AD to install the Krueger flap before bullnose may be installed. We are information describes procedures for a accomplishing the required actions. one-time detailed visual inspection for issuing this AD to address missing DAL mentioned that it has updated its Krueger flap bullnose hardware. Such discrepancies in the Krueger flap manuals to inspect after installation on bullnose attachment hardware, and missing hardware could result in the the airplane, not prior to installation. Krueger flap bullnose departing the related investigative and corrective We agree that clarification is actions; and an inspection to determine airplane during flight, which could necessary. The required inspection of damage structure and lead if any Krueger flap no. 1, 2, 3, or 4 has the Krueger flap bullnose can only be been replaced, and related investigative to the inability to maintain continued accomplished after installation on the safe flight and landing. and corrective actions. This service Krueger flap assembly, either prior to or information is reasonably available Comments after installation on the airplane. We because the interested parties have have revised paragraph (i) to specify access to it through their normal course We gave the public the opportunity to that the actions required by paragraph of business or by the means identified participate in developing this AD. The (g) of this AD must be accomplished in the ADDRESSES section. following presents the comments after installation but prior to further received on the NPRM and the FAA’s flight. Costs of Compliance response to each comment. Request To Clarify Which Krueger Support for the NPRM We estimate that this AD affects 1,814 Flaps Are Affected airplanes of U.S. registry. We estimate Boeing concurred with the content of DAL and AAL requested that we the following costs to comply with this the NPRM. Delta Air Lines (DAL) and clarify paragraph (i) of the proposed AD AD:

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ESTIMATED COSTS

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

Inspection of the Krueger flap bullnose hardware (1,495 air- 3 work-hours × $85 per hour $0 $255 $381,225 planes) (retained actions from AD 2017–16–05). = $255. Inspection to determine if any Krueger flap no. 1, 2, 3, or 4 3 work-hours × $85 per hour 0 255 462,570 has been replaced (1,814 airplanes) (new action). = $255.

We have received no definitive data the national government and the States, certificated in any category, as specified in that would enable us to provide cost or on the distribution of power and paragraphs (c)(1)(i) through (c)(1)(iii) of this estimates for the on-condition actions responsibilities among the various AD. specified in this AD. levels of government. (i) Airplanes in Groups 1 and 2 as identified in Boeing Alert Service Bulletin According to the manufacturer, some For the reasons discussed above, I 737–57A1327, Revision 2, dated July 25, of the costs of this AD may be covered certify that this AD: 2017 (‘‘BASB 737–57A1327, R2’’). under warranty, thereby reducing the (1) Is not a ‘‘significant regulatory (ii) Airplanes in Group 3, as identified in cost impact on affected individuals. We action’’ under Executive Order 12866, BASB 737–57A1327, R2, except where this do not control warranty coverage for (2) Is not a ‘‘significant rule’’ under service bulletin specifies the groups as line affected individuals. As a result, we DOT Regulatory Policies and Procedures numbers 6422 through 6465 inclusive, this have included all available costs in our (44 FR 11034, February 26, 1979), AD specifies those groups as line number cost estimate. (3) Will not affect intrastate aviation 6422 through any line number airplane with in Alaska, and an original Certificate of Airworthiness or an Authority for This Rulemaking (4) Will not have a significant original Export Certificate of Airworthiness dated on or before the effective date of this Title 49 of the United States Code economic impact, positive or negative, AD. specifies the FAA’s authority to issue on a substantial number of small entities (iii) All Model 737–600, –700, –700C, rules on aviation safety. Subtitle I, under the criteria of the Regulatory –800, –900 and –900ER series airplanes with Section 106, describes the authority of Flexibility Act. an original Certificate of Airworthiness or an original Export Certificate of Airworthiness the FAA Administrator. Subtitle VII, List of Subjects in 14 CFR Part 39 Aviation Programs, describes in more dated after the effective date of this AD. detail the scope of the Agency’s Air transportation, Aircraft, Aviation (2) Installation of Supplemental Type Certificate (STC) ST00830SE does not affect authority. safety, Incorporation by reference, Safety. the ability to accomplish the actions required We are issuing this rulemaking under by this AD. Therefore, for airplanes on which the authority described in Subtitle VII, Adoption of the Amendment STC ST00830SE is installed, a ‘‘change in Part A, Subpart III, Section 44701, product’’ alternative method of compliance ‘‘General requirements.’’ Under that Accordingly, under the authority (AMOC) approval request is not necessary to section, Congress charges the FAA with delegated to me by the Administrator, comply with the requirements of 14 CFR promoting safe flight of civil aircraft in the FAA amends 14 CFR part 39 as 39.17. follows: air commerce by prescribing regulations (d) Subject for practices, methods, and procedures PART 39—AIRWORTHINESS Air Transport Association (ATA) of the Administrator finds necessary for DIRECTIVES America Code 57, . safety in air commerce. This regulation (e) Unsafe Condition is within the scope of that authority ■ 1. The authority citation for part 39 because it addresses an unsafe condition continues to read as follows: This AD was prompted by a report of a that is likely to exist or develop on Krueger flap bullnose departing an airplane Authority: 49 U.S.C. 106(g), 40113, 44701. products identified in this rulemaking during taxi, which caused damage to the wing structure and thrust reverser, and a action. § 39.13 [Amended] report of a missing no. 2 Krueger flap This AD is issued in accordance with ■ 2. The FAA amends § 39.13 by bullnose hinge bolt from an airplane that was authority delegated by the Executive removing Airworthiness Directive (AD) not included in the effectivity of AD 2017– Director, Aircraft Certification Service, 2017–16–05, Amendment 39–18982 (82 16–05. We are issuing this AD to address as authorized by FAA Order 8000.51C. missing Krueger flap bullnose hardware. FR 39344, August 18, 2017), and adding In accordance with that order, issuance Such missing hardware could result in the the following new AD: of ADs is normally a function of the Krueger flap bullnose departing the airplane Compliance and Airworthiness 2019–03–07 The Boeing Company: during flight, which could damage Division, but during this transition Amendment 39–19559; Docket No. empennage structure and lead to the inability to maintain continued safe flight and period, the Executive Director has FAA–2018–0409; Product Identifier 2017–NM–120–AD. landing. delegated the authority to issue ADs applicable to transport category (a) Effective Date (f) Compliance airplanes and associated appliances to This AD is effective March 29, 2019. Comply with this AD within the the Director of the System Oversight compliance times specified, unless already (b) Affected ADs Division. done. This AD replaces AD 2017–16–05, (g) Required Actions Regulatory Findings Amendment 39–18982 (82 FR 39344, August 18, 2017) (‘‘AD 2017–16–05’’). For airplanes identified in paragraphs We have determined that this AD will (c)(1)(i) and (c)(1)(ii) of this AD: Except as not have federalism implications under (c) Applicability required by paragraph (h) of this AD, at the Executive Order 13132. This AD will (1) This AD applies to all The Boeing applicable times specified in paragraph 1.E., not have a substantial direct effect on Company Model 737–600, –700, –700C, ‘‘Compliance,’’ of BASB 737–57A1327, R2, the States, on the relationship between –800, –900, and –900ER series airplanes, do all applicable actions identified as ‘‘RC’’

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(required for compliance) in, and in the certification basis of the airplane, and the Issued in Des Moines, Washington, on accordance with, the Accomplishment approval must specifically refer to this AD. February 7, 2019. Instructions of BASB 737–57A1327, R2. (4) AMOCs approved previously for AD Michael Kaszycki, 2017–16–05 are approved as AMOCs for the (h) Exceptions to Service Information Acting Director, System Oversight Division, Specifications corresponding provisions of BASB 737– Aircraft Certification Service. 57A1327, R2 that are required by paragraph [FR Doc. 2019–02930 Filed 2–21–19; 8:45 am] (1) For purposes of determining (g) of this AD. BILLING CODE 4910–13–P compliance with the requirements of this AD: (5) For service information that contains Where BASB 737–57A1327, R2 uses the steps that are labeled as RC, the provisions phrase ‘‘the original issue date of this service of paragraphs (k)(5)(i) and (k)(5)(ii) of this AD bulletin,’’ this AD requires using September DEPARTMENT OF TRANSPORTATION apply. 22, 2017 (the effective date of AD 2017–16– (i) The steps labeled as RC, including 05). Federal Aviation Administration substeps under an RC step and any figures (2) For purposes of determining identified in an RC step, must be done to compliance with the requirements of this AD: 14 CFR Part 39 Where BASB 737–57A1327, R2 uses the comply with the AD. If a step or substep is phrase ‘‘the Revision 2 date of this service labeled ‘‘RC Exempt,’’ then the RC [Docket No. FAA–2018–0906; Product bulletin,’’ this AD requires using ‘‘the requirement is removed from that step or Identifier 2018–NM–122–AD; Amendment 39–19561; AD 2019–03–09] effective date of this AD.’’ substep. An AMOC is required for any deviations to RC steps, including substeps RIN 2120–AA64 (i) Parts Installation Limitation and identified figures. As of the effective date of this AD, no (ii) Operators may deviate from steps not Airworthiness Directives; Airbus SAS person may install a Krueger flap or Krueger labeled as RC by using accepted methods in Airplanes flap bullnose on any airplane identified in accordance with the operator’s maintenance paragraph (c)(1)(i), (c)(1)(ii), or (c)(1)(iii) of or inspection program without obtaining AGENCY: Federal Aviation this AD, unless the actions required by approval of an AMOC, provided the RC steps, Administration (FAA), Department of paragraph (g) of this AD have been including substeps and identified figures, can Transportation (DOT). accomplished on the Krueger flap bullnose still be done as specified, and the airplane ACTION: Final rule. after installation but prior to further flight. can be put back in an airworthy condition. These actions are required only for the SUMMARY: We are adopting a new (l) Related Information Krueger flap(s) or Krueger flap bullnose(s) airworthiness directive (AD) for all being installed. (1) For more information about this AD, Airbus SAS Model A310–304, –322, (j) Credit for Previous Actions contact Alan Pohl, Aerospace Engineer, –324, and –325 airplanes. This AD was Airframe Section, FAA, Seattle ACO Branch, prompted by an evaluation by the (1) This paragraph provides credit for the 2200 South 216th St., Des Moines, WA actions specified in paragraph (g) of this AD, design approval holder (DAH) 98198; phone and fax: 206–231–3527; email: if those actions were performed before [email protected]. indicating that certain wing skin September 22, 2017 (the effective date of AD (2) Service information identified in this stringer joints are subject to widespread 2017–16–05), using Boeing Alert Service fatigue damage (WFD). This AD requires Bulletin 737–57A1327, dated May 20, 2016. AD that is not incorporated by reference is available at the addresses specified in a rototest inspection of the fastener (2) This paragraph provides credit for the holes in the affected areas and repair if actions specified in paragraph (g) of this AD, paragraphs (m)(3) and (m)(4) of this AD. necessary, and modifying the fastener if those actions were performed before the (m) Material Incorporated by Reference effective date of this AD, using Boeing Alert holes. We are issuing this AD to address Service Bulletin 737–57A1327, Revision 1, (1) The Director of the Federal Register the unsafe condition on these products. dated September 28, 2016. approved the incorporation by reference DATES: This AD is effective March 29, (IBR) of the service information listed in this 2019. (k) Alternative Methods of Compliance paragraph under 5 U.S.C. 552(a) and 1 CFR (AMOCs) The Director of the Federal Register part 51. approved the incorporation by reference (1) The Manager, Seattle ACO Branch, (2) You must use this service information of a certain publication listed in this AD FAA, has the authority to approve AMOCs as applicable to do the actions required by for this AD, if requested using the procedures this AD, unless the AD specifies otherwise. as of March 29, 2019. found in 14 CFR 39.19. In accordance with (i) Boeing Alert Service Bulletin 737– ADDRESSES: For service information 14 CFR 39.19, send your request to your 57A1327, Revision 2, dated July 25, 2017. identified in this final rule, contact principal inspector or local Flight Standards (ii) [Reserved] Airbus SAS, Airworthiness Office— District Office, as appropriate. If sending (3) For service information identified in EAW, Rond-Point Emile Dewoitine No: information directly to the manager of the this AD, contact Boeing Commercial 2, 31700 Blagnac Cedex, France; certification office, send it to the attention of Airplanes, Attention: Contractual & Data telephone +33 5 61 93 36 96; fax +33 5 the person identified in paragraph (l)(1) of Services (C&DS), 2600 Westminster Blvd., 61 93 44 51; email account.airworth- this AD. Information may be emailed to: 9- MC 110–SK57, Seal Beach, CA 90740–5600; [email protected]. [email protected]; internet http:// phone: 562–797–1717; internet: https:// (2) Before using any approved AMOC, www.airbus.com. You may view this www.myboeingfleet.com. notify your appropriate principal inspector, service information at the FAA, or lacking a principal inspector, the manager (4) You may view this service information Transport Standards Branch, 2200 of the local flight standards district office/ at the FAA, Transport Standards Branch, South 216th St., Des Moines, WA. For 2200 South 216th St., Des Moines, WA. For certificate holding district office. information on the availability of this (3) An AMOC that provides an acceptable information on the availability of this material at the FAA, call 206–231–3195. material at the FAA, call 206–231–3195. level of safety may be used for any repair, It is also available on the internet at modification, or alteration required by this (5) You may view this service information AD if it is approved by the Boeing that is incorporated by reference at the http://www.regulations.gov by searching Commercial Airplanes Organization National Archives and Records for and locating Docket No. FAA–2018– Designation Authorization (ODA) that has Administration (NARA). For information on 0906. been authorized by the Manager, Seattle ACO the availability of this material at NARA, call Examining the AD Docket Branch, FAA, to make those findings. To be 202–741–6030, or go to: http:// approved, the repair method, modification www.archives.gov/federal-register/cfr/ibr- You may examine the AD docket on deviation, or alteration deviation must meet locations.html. the internet at http://

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