Federal Register / Vol. 81, No. 13 / Thursday, January 21, 2016 / Rules and Regulations 3313

Issued in Fort Worth, Texas, on January 6, 4000; fax 416–375–4539; email cracks, if not detected, could propagate to 2016. [email protected]; result in the structural failure of the steps. Bruce E. Cain, Internet http://www.bombardier.com. In the event of an emergency egress situation, the failure of the airstair step Acting Manager, Rotorcraft Directorate, You may view this referenced service assembly could impede the evacuation of Certification Service. information at the FAA, Transport passengers. [FR Doc. 2016–00664 Filed 1–20–16; 8:45 am] Airplane Directorate, 1601 Lind Avenue This [Canadian] AD mandates the BILLING CODE 4910–13–P SW., Renton, WA. For information on replacement of the affected forward the availability of this material at the passenger airstair step assembly with a new FAA, call 425–227–1221. It is also or reworked step assembly. DEPARTMENT OF TRANSPORTATION available on the Internet at http:// Revision 1 of this [Canadian] AD provides www.regulations.gov by searching for additional instructions for performing an Federal Aviation Administration and locating Docket No. FAA–2014– electronic tap test of the airstair step 0447. assembly if the Serial Number (S/N) of the 14 CFR Part 39 airstair step assembly cannot be found. FOR FURTHER INFORMATION CONTACT: [Docket No. FAA–2014–0447; Directorate Required actions include an Jeffrey Zimmer, Aerospace Engineer, inspection to determine the serial Identifier 2014–NM–019–AD; Amendment Airframe and Mechanical Systems 39–18368; AD 2016–01–09] number of the airstair door step Branch, ANE–171, FAA, New York assembly, and if necessary, an electronic RIN 2120–AA64 Aircraft Certification Office, 1600 tap test and reidentification and Stewart Avenue, Suite 410, Westbury, replacement of the assembly. You may Airworthiness Directives; Bombardier, NY 11590; telephone 516–228–7306; fax Inc. Airplanes examine the MCAI in the AD docket on 516–794–5531. the Internet at http:// AGENCY: Federal Aviation SUPPLEMENTARY INFORMATION: www.regulations.gov/ Administration (FAA), Department of Discussion #!documentDetail;D=FAA-2014-0447- Transportation (DOT). 0004. ACTION: Final rule. We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR Comments SUMMARY: We are adopting a new part 39 by adding an AD that would We gave the public the opportunity to airworthiness directive (AD) for certain apply to certain Bombardier Model participate in developing this AD. The Bombardier Model DHC–8–400 series DHC–8–400 series airplanes. The NPRM following presents the comments airplanes. This AD was prompted by a published in the Federal Register on received on the NPRM (79 FR 41661, report of several cracks found on the July 17, 2014 (79 FR 41661). The NPRM July 17, 2014) and the FAA’s response forward passenger airstair door step was prompted by a report of several to each comment. assembly. This AD requires an cracks found on the forward passenger Request To Refer to Latest Service inspection to determine the serial airstair door step assembly. The NPRM Information number of the airstair door step proposed to require an inspection to assembly, and if necessary, an electronic determine the serial number of the Republic and Horizon Air tap test, reidentification of the airstair airstair door step assembly, and if requested that we revise the NPRM (79 door step assembly, and replacement of necessary, an electronic tap test, FR 41661, July 17, 2014) to refer to the the airstair door step assembly. We are reidentification of the airstair door step latest service information. issuing this AD to detect and correct assembly, and replacement of the We agree with the request. The cracks in the forward passenger airstair airstair door step assembly. We are revised service information, Bombardier door step assembly; such cracking could issuing this AD to detect and correct Service Bulletin 84–52–77, Revision C, propagate and result in the structural cracks in the forward passenger airstair dated June 5, 2014, provides minor failure of the steps and impede the door step assembly; such cracking could wording changes but does not change evacuation of passengers in the event of propagate and result in the structural the procedures or add any airplanes. We an emergency egress situation. failure of the steps and impede the have revised paragraphs (g) and (h) in this AD to refer to the new service DATES: This AD becomes effective evacuation of passengers in the event of an emergency egress situation. information, and added Bombardier February 25, 2016. Service Bulletin 84–52–77, Revision B, The Director of the Federal Register Transport Canada (TCCA), which is the aviation authority dated October 31, 2013, to paragraph (i) approved the incorporation by reference of this AD, to provide credit for of a certain publication listed in this AD for Canada, has issued Canadian Airworthiness Directive CF–2013–20R1, previous actions done before the as of February 25, 2016. effective date of this AD. ADDRESSES: You may examine the AD dated December 30, 2013 (referred to docket on the Internet at http:// after this as the Mandatory Continuing Request To Allow Records Review Airworthiness Information, or ‘‘the www.regulations.gov/ Horizon Air requested that we revise MCAI’’), to correct an unsafe condition #!docketDetail;D=FAA-2014-0447; or in paragraph (g) of the proposed AD (79 FR for the specified products. The MCAI person at the Docket Management 41661, July 17, 2014) to allow a review states: Facility, U.S. Department of of aircraft records, in addition to a Transportation, Docket Operations, M– There has been one in-service report of physical inspection, as a way to 30, West Building Ground Floor, Room several cracks being found on the forward determine the serial number of the W12–140, 1200 New Jersey Avenue SE., passenger airstair door step assembly airstair door step assembly. Washington, DC. between the steps and the sidewall panels. We disagree with the request. A The investigation revealed that the For service information identified in application of potting compound may have review of aircraft records may provide this final rule, contact Bombardier, Inc., been omitted during the bonding at the joint an appropriate means to determine Q-Series Technical Help Desk, 123 of the airstair door steps and the sidewalls. serial numbers. For the airstair door step Garratt Boulevard, Toronto, Ontario The omission of potting compound could assembly, however, we understand that M3K 1Y5, Canada; telephone 416–375– cause the bonding sealant to crack. The operators may remove and exchange the

VerDate Sep<11>2014 15:08 Jan 20, 2016 Jkt 238001 PO 00000 Frm 00025 Fmt 4700 Sfmt 4700 E:\FR\FM\21JAR1.SGM 21JAR1 jstallworth on DSK7TPTVN1PROD with RULES 3314 Federal Register / Vol. 81, No. 13 / Thursday, January 21, 2016 / Rules and Regulations

assemblies within their fleet for repair, in paragraph 3.A., ‘‘Job Set-up,’’ and up to 9 work-hours and require parts and replace them relatively quickly to paragraph 3.C., ‘‘Close Out,’’ of the costing $206,175, for a cost of $206,940 minimize airplane downtime. In these Accomplishment Instructions of per product. We have no way of cases, there may be a lag between the Bombardier Service Bulletin 84–52–77, determining the number of aircraft that removal and replacement action and Revision C, dated June 5, 2014. Horizon might need these actions. updating the records typically used to Air added that incorporating the Job Set- Authority for This Rulemaking conduct a records review. In up and Close Out as a requirement of coordination with TCCA, we have the AD would restrict an operator’s Title 49 of the United States Code determined that airplane records may ability to perform other maintenance in specifies the FAA’s authority to issue not reliably reflect the serial numbers of conjunction with the incorporation of rules on . Subtitle I, all airstair door step assemblies present the service information. section 106, describes the authority of on the affected airplanes. However, We agree with the request and the the FAA Administrator. ‘‘Subtitle VII: under the provisions of paragraph (j)(1) commenter’s rationale. We have revised Aviation Programs,’’ describes in more of this AD, we will consider requests for paragraph (g) of this AD accordingly. detail the scope of the Agency’s approval of an alternative method of authority. compliance for determining serial Conclusion We are issuing this rulemaking under numbers, if sufficient data are submitted We reviewed the relevant data, the authority described in ‘‘Subtitle VII, to substantiate that the new method considered the comments received, and Part A, Subpart III, Section 44701: would provide an acceptable level of determined that air safety and the General requirements.’’ Under that safety. We have not changed this final public interest require adopting this AD section, Congress charges the FAA with rule regarding this issue. with the changes described previously promoting safe flight of civil aircraft in and minor editorial changes. We have air commerce by prescribing regulations Request To Allow Maintenance Manual determined that these minor changes: for practices, methods, and procedures Tasks for Airstair Replacement • Are consistent with the intent that the Administrator finds necessary for Horizon Air requested that we revise was proposed in the NPRM (79 FR safety in air commerce. This regulation paragraph (g)(1)(ii) of the proposed AD 41661, July 17, 2014) for correcting the is within the scope of that authority (79 FR 41661, July 17, 2014), which unsafe condition; and because it addresses an unsafe condition would conditionally require replacing • Do not add any additional burden that is likely to exist or develop on the airstair door step assembly in upon the public than was already products identified in this rulemaking accordance with Bombardier Service proposed in the NPRM (79 FR 41661, action. Bulletin 84–52–77, Revision B, dated July 17, 2014). October 31, 2013. For this action, We also determined that these Regulatory Findings Horizon Air requested that we also changes will not increase the economic We determined that this AD will not allow the replacement to be done using burden on any operator or increase the have federalism implications under maintenance manual tasks 52–11–01– scope of this AD. Executive Order 13132. This AD will 000–801 and 52–11–01–400–801. not have a substantial direct effect on Related Service Information Under 1 Horizon Air stated that the service the States, on the relationship between CFR Part 51 information specified in the NPRM does the national government and the States, not include any actions beyond those Bombardier has issued Service or on the distribution of power and specified in the maintenance manual Bulletin 84–52–77, Revision C, dated responsibilities among the various tasks. June 5, 2014, including Appendix A, levels of government. We disagree with the request. Part 3, and with the attached Short Brothers For the reasons discussed above, I ‘‘Procedure,’’ of the Accomplishment Service Bulletin D8400–52–0011, certify that this AD: Instructions of Bombardier Service Revision C, dated February 26, 2014. 1. Is not a ‘‘significant regulatory Bulletin 84–52–77, Revision C, dated The service information describes action’’ under Executive Order 12866; June 5, 2014, does, in fact, specify procedures for determining the airstair 2. Is not a ‘‘significant rule’’ under the additional tasks not included in the door step assembly serial number, doing DOT Regulatory Policies and Procedures maintenance manual tasks referenced by an electronic tap test, and reidentifying (44 FR 11034, February 26, 1979); the commenter. The additional tasks and replacing the assembly. This service 3. Will not affect intrastate aviation in include verification of the serial number information is reasonably available Alaska; and of the new airstair door step assembly because the interested parties have 4. Will not have a significant before installation, and adjustment and access to it through their normal course economic impact, positive or negative, a functional check of the new door. We of business or by means identified in the on a substantial number of small entities have not changed this AD regarding this ADDRESSES section of this AD. under the criteria of the Regulatory issue. Flexibility Act. Costs of Compliance Request To Limit Requirements to Steps We estimate that this AD affects 76 Examining the AD Docket That Correct the Unsafe Condition airplanes of U.S. registry. We also You may examine the AD docket on Horizon Air requested that we revise estimate that it will take about 1 work- the Internet at http:// the NPRM (79 FR 41661, July 17, 2014) hour per product to comply with the www.regulations.gov/ to require only the section of the basic requirements of this AD. The #!docketDetail;D=FAA-2014-0447; or in Accomplishment Instructions of average labor rate is $85 per work-hour. person at the Docket Management Bombardier Service Bulletin 84–52–77, Required parts would cost about $0 per Facility between 9 a.m. and 5 p.m., Revision C, dated June 5, 2014, that product. Based on these figures, we Monday through Friday, except Federal directly corrects the unsafe condition: estimate the cost of this AD on U.S. holidays. The AD docket contains this paragraph 3.B., ‘‘Procedure.’’ Horizon operators to be $6,460, or $85 per AD, the regulatory evaluation, any Air stated that the unsafe condition is product. comments received, and other not directly corrected by In addition, we estimate that any information. The street address for the accomplishment of the actions specified necessary follow-on actions would take Docket Operations office (telephone

VerDate Sep<11>2014 15:08 Jan 20, 2016 Jkt 238001 PO 00000 Frm 00026 Fmt 4700 Sfmt 4700 E:\FR\FM\21JAR1.SGM 21JAR1 jstallworth on DSK7TPTVN1PROD with RULES Federal Register / Vol. 81, No. 13 / Thursday, January 21, 2016 / Rules and Regulations 3315

800–647–5527) is in the ADDRESSES with the attached Short Brothers Service (j) Other FAA AD Provisions section. Bulletin D8400–52–0011, Revision C, dated The following provisions also apply to this February 26, 2014. AD: List of Subjects in 14 CFR Part 39 (1) If the serial number of the airstair door (1) Alternative Methods of Compliance Air transportation, Aircraft, Aviation step assembly cannot be found, or if the (AMOCs): The Manager, New York Aircraft safety, Incorporation by reference, serial number is illegible: Before further Certification Office (ACO), ANE–170, FAA, Safety. flight, do an electronic tap test to determine has the authority to approve AMOCs for this the existence of epoxy compound, in AD, if requested using the procedures found Adoption of the Amendment accordance with paragraph 3.B., in 14 CFR 39.19. In accordance with 14 CFR Accordingly, under the authority ‘‘Procedure,’’ of the Accomplishment 39.19, send your request to your principal Instructions of Bombardier Service Bulletin inspector or local Flight Standards District delegated to me by the Administrator, 84–52–77, Revision C, dated June 5, 2014, Office, as appropriate. If sending information the FAA amends 14 CFR part 39 as including Appendix A, and with the attached directly to the ACO, send it to ATTN: follows: Short Brothers Service Bulletin D8400–52– Program Manager, Continuing Operational 0011, Revision C, dated February 26, 2014. Safety, FAA, New York ACO, 1600 Stewart PART 39—AIRWORTHINESS (i) If the existence of epoxy compound is Avenue, Suite 410, Westbury, NY 11590; DIRECTIVES confirmed, before further flight, reidentify telephone 516–228–7300; fax 516–794–5531. the airstair door step assembly, in accordance Before using any approved AMOC, notify ■ 1. The authority citation for part 39 with paragraph 3.B., ‘‘Procedure,’’ of the your appropriate principal inspector, or continues to read as follows: Accomplishment Instructions of Bombardier lacking a principal inspector, the manager of the local flight standards district office/ Authority: 49 U.S.C. 106(g), 40113, 44701. Service Bulletin 84–52–77, Revision C, dated June 5, 2014, including Appendix A, and certificate holding district office. The AMOC § 39.13 [Amended] with the attached Short Brothers Service approval letter must specifically reference this AD. ■ 2. The FAA amends § 39.13 by adding Bulletin D8400–52–0011, Revision C, dated February 26, 2014. (2) Contacting the Manufacturer: For any the following new airworthiness requirement in this AD to obtain corrective (ii) If the existence of epoxy compound is actions from a manufacturer, the action must directive (AD): not confirmed: Within 6,000 flight hours after be accomplished using a method approved the effective date of this AD, replace the 2016–01–09 Bombardier, Inc.: Amendment by the Manager, New York ACO, ANE–170, airstair door step assembly, in accordance 39–18368. Docket No. FAA–2014–0447; FAA; or Transport Canada Civil Aviation with paragraph 3.B., ‘‘Procedure,’’ of the Directorate Identifier 2014–NM–019–AD. (TCCA); or Bombardier, Inc.’s TCCA Design Accomplishment Instructions of Bombardier (a) Effective Date Approval Organization (DAO). If approved by Service Bulletin 84–52–77, Revision C, dated the DAO, the approval must include the This AD becomes effective February 25, June 5, 2014, including Appendix A, and DAO-authorized signature. 2016. with the attached Short Brothers Service (k) Related Information (b) Affected ADs Bulletin D8400–52–0011, Revision C, dated February 26, 2014. (1) Refer to Mandatory Continuing None. (2) If the serial number of the airstair door Airworthiness Information (MCAI) Canadian (c) Applicability step assembly is in the affected range Airworthiness Directive CF–2013–20R1, specified in paragraph 1.A., ‘‘Effectivity,’’ of dated December 30, 2013, for related This AD applies to Bombardier, Inc. Model Bombardier Service Bulletin 84–52–77, DHC–8–400, –401, and –402 airplanes, information. This MCAI may be found in the Revision C, dated June 5, 2014: Within 6,000 AD docket on the Internet at http:// certificated in any category, serial numbers flight hours after the effective date of this AD, 4001 and subsequent. www.regulations.gov/ replace the airstair door step assembly, in #!documentDetail;D=FAA-2014-0447-0004. (d) Subject accordance with paragraph 3.B., (2) Service information identified in this Air Transport Association (ATA) of ‘‘Procedure,’’ of the Accomplishment AD that is not incorporated by reference is America Code 52, Doors. Instructions of Bombardier Service Bulletin available at the addresses specified in 84–52–77, Revision C, dated June 5, 2014, paragraphs (l)(3) and (l)(5) of this AD. (e) Reason including Appendix A, and with the attached (l) Material Incorporated by Reference This AD was prompted by a report of Short Brothers Service Bulletin D8400–52– several cracks found on the forward 0011, Revision C, dated February 26, 2014. (1) The Director of the Federal Register approved the incorporation by reference passenger airstair door step assembly. We are (h) Parts Installation Prohibition issuing this AD to detect and correct cracks (IBR) of the service information listed in this in the forward passenger airstair door step As of the effective date of this AD, no paragraph under 5 U.S.C. 552(a) and 1 CFR assembly, which could propagate and result person may install on any airplane an airstair part 51. in the structural failure of the steps and door step assembly with part number (2) You must use this service information impede the evacuation of passengers in the 85217008–001 containing a serial number in as applicable to do the actions required by event of an emergency egress situation. the affected range specified in paragraph this AD, unless this AD specifies otherwise. 1.A., ‘‘Effectivity,’’ of Bombardier Service (i) Bombardier Service Bulletin 84–52–77, (f) Compliance Bulletin 84–52–77, Revision C, dated June 5, Revision C, dated June 5, 2014, including Comply with this AD within the 2014, including Appendix A, and with the Appendix A, which is undated, and attached compliance times specified, unless already attached Short Brothers Service Bulletin Short Brothers Service Bulletin D8400–52– done. D8400–52–0011, Revision C, dated February 0011, Revision C, dated February 26, 2014. 26, 2014. (ii) Reserved. (g) Inspection, Electronic Tap Test, (3) For Bombardier service information Reidentification, and Replacement of the (i) Credit for Previous Actions identified in this AD, contact Bombardier, Airstair Door Step Assembly This paragraph provides credit for actions Inc., Q-Series Technical Help Desk, 123 For airplanes having serial numbers 4001 required by paragraph (g) of this AD if the Garratt Boulevard, Toronto, Ontario M3K through 4393: Within 320 days after the serial number is known, and if those actions 1Y5, Canada; telephone 416–375–4000; fax effective date of this AD, do an inspection to were performed before the effective date of 416–375–4539; email thd.qseries@ determine the serial number of the airstair this AD using Bombardier Service Bulletin aero.bombardier.com; Internet http:// door step assembly, in accordance with 84–52–77, Revision A, dated April 24, 2013; www.bombardier.com. paragraph 3.B., ‘‘Procedure,’’ of the or Bombardier Service Bulletin 84–52–77, (4) For Short Brothers service information Accomplishment Instructions of Bombardier Revision B, dated October 31, 2013. This identified in this AD, contact Short Brothers Service Bulletin 84–52–77, Revision C, dated service information is not incorporated by PLC, Airworthiness, P.O. Box 241, June 5, 2014, including Appendix A, and reference in this AD. Road, Belfast, BT3 9DZ Northern Ireland;

VerDate Sep<11>2014 15:08 Jan 20, 2016 Jkt 238001 PO 00000 Frm 00027 Fmt 4700 Sfmt 4700 E:\FR\FM\21JAR1.SGM 21JAR1 jstallworth on DSK7TPTVN1PROD with RULES 3316 Federal Register / Vol. 81, No. 13 / Thursday, January 21, 2016 / Rules and Regulations

telephone +44(0)2890–462469; fax reduced structural integrity of the these findings indicated that a number of in- +44(0)2890 468444; email airframe. service aeroplanes could be similarly [email protected]; affected. Internet http://www.bombardier.com. DATES: This AD becomes effective This condition, if not detected and (5) You may view this service information February 25, 2016. corrected, could lead to crack propagation at the FAA, Transport Airplane Directorate, The Director of the Federal Register and consequent deterioration of the 1601 Lind Avenue SW., Renton, WA. For approved the incorporation by reference structural integrity of the aeroplane. information on the availability of this of a certain publication listed in this AD To address this potential unsafe condition, material at the FAA, call 425–227–1221. as of February 25, 2016. [Directorate General for Civil Aviation] DGAC France AD 97–311–105 [which (6) You may view this service information ADDRESSES: You may examine the AD corresponds to FAA AD 98–18–26, that is incorporated by reference at the docket on the Internet at http:// National Archives and Records Amendment 39–10742 (63 FR 47423, Administration (NARA). For information on www.regulations.gov/ September 8, 1998)] was issued to require the availability of this material at NARA, call #!docketDetail;D=FAA-2015-1422; or in repetitive [HFEC] inspections [for cracking] 202–741–6030, or go to: http:// person at the Docket Management in accordance with the instruction of Airbus www.archives.gov/federal-register/cfr/ibr- Facility, U.S. Department of Service Bulletin (SB) A320–57–1016. At the locations.html. Transportation, Docket Operations, M– same time, the modification provided by 30, West Building Ground Floor, Room Airbus SB A320–57–1017 was considered to Issued in Renton, Washington, on January be terminating action for the repetitive 4, 2016. W12–140, 1200 New Jersey Avenue SE., inspections required by DGAC France AD Victor Wicklund, Washington, DC. 97–311–105. For service information identified in Acting Manager, Transport Airplane Since that [DGAC] AD was issued, and Directorate, Aircraft Certification Service. this AD, contact Airbus, Airworthiness following new analysis, modification per Office—EIAS, 1 Rond Point Maurice Airbus SB A320–57–1017 is no longer [FR Doc. 2016–00378 Filed 1–20–16; 8:45 am] Bellonte, 31707 Blagnac Cedex, France; considered to be terminating action for the BILLING CODE 4910–13–P telephone +33 5 61 93 36 96; fax +33 5 repetitive inspections as required by DGAC 61 93 44 51; email account.airworth- France AD 97–311–105. [email protected]; Internet http:// Aeroplanes with [manufacturer serial DEPARTMENT OF TRANSPORTATION number] MSN 0080 up to 0155 inclusive www.airbus.com. You may view this have been delivered with the addition of a 5 Federal Aviation Administration referenced service information at the [millimeter] mm thick light alloy shim under FAA, Transport Airplane Directorate, the heads of 2 fasteners at the top end of the 14 CFR Part 39 1601 Lind Avenue SW., Renton, WA. front spar vertical stringers (Airbus For information on the availability of modification 21290P1546, which is the [Docket No. FAA–2015–1422; Directorate this material at the FAA, call 425–227– production line equivalent to in-service Identifier 2014–NM–125–AD; Amendment 1221. It is also available on the Internet modification through Airbus SB A320–57– 39–18370; AD 2016–01–11] at http://www.regulations.gov by 1017). From MSN 0156 and higher, all RIN 2120–AA64 aeroplanes are delivered with vertical searching for and locating Docket stiffeners of the forward wing spar upper end Number FAA–2015–1422. Airworthiness Directives; Airbus with stiffener cap thickness increased from 4 FOR FURTHER INFORMATION CONTACT: to 6 mm (Airbus modification 21290P1547). Airplanes Sanjay Ralhan, Aerospace Engineer, Prompted by these findings, Airbus issued AGENCY: Federal Aviation International Branch, ANM–116, SB A320–57–1178 to introduce new Administration (FAA), Department of Transport Airplane Directorate, FAA, repetitive inspections with new thresholds 1601 Lind Avenue SW., Renton, WA and intervals. Transportation (DOT). For the reasons described above, DGAC ACTION: Final rule. 98057–3356; telephone 425–227–1405; France AD 97–311–105 is superseded and fax 425–227–1149. this [EASA] AD requires the repetitive SUMMARY: We are superseding SUPPLEMENTARY INFORMATION: inspections at new thresholds and intervals. Airworthiness Directive (AD) 98–18–26, After EASA issued [proposed for certain Airbus Model A320 series Discussion airworthiness directive] PAD 14–021, it was airplanes. AD 98–18–26 required We issued a notice of proposed discovered that additional work [HFEC repetitive inspections to detect fatigue rulemaking (NPRM) to amend 14 CFR inspections for cracking of the radius of spar cracking of the front spar vertical part 39 to supersede AD 98–18–26, vertical stringers and horizontal beam in the stringers on the wings; and repair, if Amendment 39–10742 (63 FR 47423, center fuselage of frame 36, and a rototest inspection for cracking of the fastener holes necessary. This new AD requires September 8, 1998). AD 98–18–26 of the spar vertical stringers radius on Frame repetitive high frequency eddy current applied to certain Airbus Model A320 36 and repair if necessary], to be included in (HFEC) inspections for cracking of the series airplanes. The NPRM published Revision 01 of Airbus SB A320–57–1178, is radius of the front spar vertical stringers in the Federal Register on June 5, 2015 required to accomplish the inspections. This and the horizontal floor beam on frame (80 FR 32063). Final [EASA] AD has been amended 36, a rototest inspection for cracking of The European Aviation Safety Agency accordingly. the fastener holes of the front spar (EASA), which is the Technical Agent You may examine the MCAI in the vertical stringers on frame 36, and repair for the Member States of the European AD docket on the Internet at http:// if necessary. This AD was prompted by Union, has issued EASA Airworthiness www.regulations.gov/ reports that indicate new repetitive Directive 2014–0069, dated March 19, #!documentDetail;D=FAA-2015-1422- inspections having new thresholds and 2014 (referred to after this as the 0002. intervals are needed and that additional Mandatory Continuing Airworthiness work is needed to accomplish the Information, or ‘‘the MCAI’’), to correct Comments inspections on airplanes on which a an unsafe condition on certain Airbus We gave the public the opportunity to previous modification has been Model A320–211, –212, and –231 participate in developing this AD. The accomplished. We are issuing this AD to airplanes. The MCAI states: following presents the comments detect and correct fatigue cracking of the During center fuselage certification full received on the NPRM (80 FR 32063, front spar vertical stringers on the scale fatigue test, cracks were found on the June 5, 2015) and the FAA’s response to wings, which could result in the front vertical stringer at frame 36. Analysis of the comments.

VerDate Sep<11>2014 15:08 Jan 20, 2016 Jkt 238001 PO 00000 Frm 00028 Fmt 4700 Sfmt 4700 E:\FR\FM\21JAR1.SGM 21JAR1 jstallworth on DSK7TPTVN1PROD with RULES