### DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA-2016-4123; Directorate Identifier 2016-NE-06-AD I RIN 2120-AA64 14910-13-P]



### Airworthiness Directives; International Aero Engines AG Turbofan Engines AGENCY: Federal Aviation Administration (FAA), DOT

. 

### ACTION: Notice ofproposed rulemaking (NPRM). 

### SUMMARY: We pr opose to adopt a new airworthiness directive (AD) for certain I nternational Aero Engines AG (IAE) V2522-A5 , V2524-A5, V2525-D5, V2527-A5, V2527E

-A5, V2527M-A5, V2528-05, V2530-A5 , and V2533-A5 turbofan engines. This proposed AD was prompted by the fracture ofthe high-pressure turbine (HPT) stage 2 hub during flight, which resulted in an in-flight shutdown (IFSD), undercowl fire, and smoke in the cabin. This proposed AD would require inspecting the HPT stage 1 hub and HPT stage 2 hub , and, ifnecessary , their replacement with parts that are eligible for installation. We are proposing this AD to prevent failure ofthe HPT stage 1 or HPT stage 2 hubs , which could result in uncontained HPT blade release, damage to the engine, and damage to the airplane. 

### DATES: We must receive comments on this proposed AD by [INSERT DATE 60 DAYS AFTER DATE OF PUBLICATION T N THE Federal Regi ster]. 

### ADDRESSES: You may send comments, using the procedures found in 14 CFR 11.43 and 11 .45 , by any ofthe following methods:

• Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments.

• Fax: 202-493-2251.• Mail: U.S. Department ofTransportation, 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 NPRM, contact International Aero Engines AG, 400 Main Street, East Hartford, CT 06118; phone: 860-368-3700; fax: 860- 368-4600; email: iaeinfo@iaev2500.com;Internet:https://www.iaeworld.com. You may view this service info1mation at the FAA, Engine & Propeller Directorate, 1200 District Avenue, Burlington, MA. For information on the availability ofthis material at the FAA, call 781-238-7125. Examining the AD Docket You may examine the AD docket on the Internet at http:/ /www. regulations.gov by searching for and locating Docket No. FAA-2016-4123 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: Brian Kierstead, Aerospace Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 1200 District Avenue, Burlington, MA 01803; phone: 781-238-7772; fax: 781-238-7199; email: brian.kierstead@faa.gov.

2SUPPLEMENTARY 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-2016-4123; Directorate Identifier 2016-NE-06-AD" at the beginning ofyour comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects ofthis 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 http://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 ofan engine IFSD and subsequent undercowl fire on an IAE V2527-A5 turbofan engine during a revenue flight ofan Airbus A320 airplane in September 2014. The subsequent investigation ofthis event determined that it was caused by a manufacturing defect in the HPT stage 2 hub that resulted in fracture and failure of the l

- IPT stage 2 hub. The event involved release ofa fir tree lug and two HPT stage 2 blades. JAE also identified a similar manufacturing defect on the HPT stage 1 hub. This condition, if not corrected, could result in uncontained HPT blade release , damage to the engine, and damage to the airplane. Related Service Information under 1 CFR part 51 We reviewed lAE Non-Modification Service Bulletin (NMSB) No. V2500-ENG72-0661, Revision No. 1, dated February 5, 2016. The NMSB describes procedures for inspecting the HPT stage 1 and stage 2 hubs. This service infonnation is reasonably 3available because the interested parties have access to it through their normal course of business or by the means identified in the ADDRESSES section. 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 ofthe same type design. Proposed AD Requirements This proposed AD would require inspecting the engine HPT stage 1 hub and HPT stage 2 hub, and, ifnecessary, their replacement with parts eligible for installation. Costs of Compliance We estimate that this proposed AD affects 668 engines with 947 hubs installed on airplanes ofU.S. registry. Some ofthe 668 engines have two hubs installed. We estimate that it would take about 8 hours per hub to perform the piece-part inspection. The average labor rate is $85 per hour. We estimate that 568 hubs will require replacement. We estimate the pro-rated cost to replace an HPT stage 1 hub to be $50,271 and the pro-rated cost to replace an HPT stage 2 hub to be $40,063. Based on these figures, we estimate the cost ofthis proposed AD on U.S. operators to be $26,298,816. Authority for this Rulemaking Title 49 ofthe United States Code specifies the FAA's authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority ofthe FAA Administrator. Subtitle VII: Aviation Programs , describes in more detail the scope ofthe 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 civi I aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds 4necessary for safety in air commerce. This regulation is within the scope ofthat 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 distribution ofpower and responsibilities among the various levels of government. For the reasons discussed above, I ce1tify 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 to the extent that itjustifies making a regulatory distinction, and (4) Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria ofthe 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 I. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701.

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### § 39.13 [Amended] 2. The FAA amends 

### § 39.13 by adding the following new airworthiness directive (AD): 

### International Aero Engines AG: Docket No. FAA-2016-4123; Directorate Identifier 2016-NE-06-AD. 

### (a) Comments Due Date We must receive comments by [INSERT DATE 60 DAYS AFTER DA TE OF PUBLICATION IN THE Federal Register]. 

### (b) Affected ADs None. 

### (c) Applicability This AD applies to International Aero Engines AG (IAE) V2522-A5, V2524-A5, V2525-D5, V2527-A5, V2527E-A5, V2527M-A5, V2528-D5, V2530-A5, and V2533- A5, engines with either ofthe following installed: (1) high-pressure turbine (HPT) stage 1 hub, part number (PIN) 2A5001, with a

serial number (SIN) listed in Table 1, Appendix A, ofIAE Non-Modification Service Bulletin (NMSB) No. V2500-ENG-72-0661, Revision 1, dated February 5, 2016; or (2) HPT stage 2 hub, PIN 2A4802, with an 

### SIN listed in Table 2, Appendix A, of IAE NMSB No. V2500-ENG-72-0661, Revision 1, dated February 5, 2016. 

### (d) Unsafe Condition This AD was prompted by the fracture ofthe HPT stage 2 hub during flight, which resulted in an in-flight shutdown, undercowl fire, and smoke in the cabin. We are issuing this AD to prevent failure ofthe HPT stage 1 or HPT stage 2 hubs, which could result in uncontained HPT blade release, damage to the engine, and damage to the airplane.

6(e) Compliance Comply with this AD within the compliance times speci fied, unless already done. (1) Inspect the HPT stage l hub , 

### PIN 2A5001, and HPT stage 2 hub, 

### PIN 2A4802, at the next shop visit or as follows, whichever comes first: (i) For hubs with Oto 7 ,000 CSN, before accumulating 13 ,000 CSN; (ii) For hubs with 7 ,001 to 11 ,000 CSN, within 6,000 cycles from the effective date ofthis AD or before accumulating 15,000 CSN, whichever occurs first ; (iii) For hubs with 11 ,001 to 15 , 500 CSN, within 4,000 cycles from the effective date ofthis AD or before accumulating 17,000 CSN, whichever occurs first; (iv) For hubs with 15 ,5 01 CSN or greater, within 1 ,5 00 cycles from the effective date ofthis AD. (2) Use Accomplishment Instructions, paragraphs 2.A., 2.C., and 2.D., of JAE NMSB No. V2500-ENG-72-0661, Revision 1, dated February 5, 2016, to inspect the HPT stage 1 hub, 

### PIN 2A5001. (3) Use Accomplishment Instructions, paragraphs 2.E., 2.G., and 2H., ofIAE NMSB No. V25 00-ENG-72-0661, to inspect the HPT stage 2 hub, 

### PIN 2A4802. (4) Remove from service any HPT stage 1 hub, 

### P IN 2A5 001 , or HPT stage 2 hub, 

### P

IN 2A4802, that fail the inspections required by paragraphs (e)(2) and (e)(3) ofthi s AD, and replace with a part that is eligible for installation

. (t) Definition For the purpose ofthis AD, a "shop visit" is the induction ofan engine into the shop for maintenance involving the separation ofpairs of major mating engine flanges, except that the separation ofengine flanges solely for the purposes oftransportation without subsequent engine maintenance does not constitute an engine shop visit.

7(g) Alternative Methods of Compliance (AMOCs) The Manager, Engine Certification Office, FAA, may approve AMOCs for this AD. Use the procedures found in 14 CFR 39.19 to make your request. You may email your request to: ANE-AD-AMOC@faa.gov. (h) Related Information (1) For more information about this AD, contact Brian Kierstead, Aerospace Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 1200 District Avenue, Burlington, MA 01803; phone: 781-238-7772; fax: 781-238-7199; email: brian.kierstead@faa.gov. (2) For service information identified in this proposed AD, contact International Aero Engines AG, 400 Main Street , East Ha1tford, CT 06118; phone: 860-368-3700; fax: 860-368-4600; email: iaeinfo@iaev2500.com;Internet:https://www.iaeworld.com. (3) You may view this service infonnation at the FAA, Engine 

### & Propeller Directorate, 1200 District Avenue, Burlington, MA. For infonnation on the availability of this material at the FAA, call 781-238-7125.

Issued in Burlington, Massachusetts, on March 24, 2016.

Colleen M. D'Alessandro, Manager, Engine & Propeller Directorate, Aircraft Certification Service.



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