### DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. 

### FAA-2013-0195; Directorate Identifier 2013-NE-08-AD] RIN 2120-AA64 Airworthiness Directives; General Electric Company Turbofan Engines AGENCY: Federal Aviation Administration (FAA) , DOT. 

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

### [4910-13-P]

SUMMARY: We propose to adopt a new airworthiness directive (AD) for all General Electric Company (GE) model GEnx-2B67 and GEnx-2B67B turbofan engines with booster anti-ice (BAI) air duct, part number (PIN) 2469M32G01 , and support bracket, 

### PIN 2469M46G01 , installed. This proposed AD was prompted by reports of cracks in the BAI air duct. This proposed AD would require initial and repetitive visual inspections of the BAI air duct, removal from service ofthe BAI air duct if it fails inspection and , as a mandatory terminating action, the installation of new BAI air duct support brackets. We

are proposing this AD to prevent failure of the BAI air duct, resulting in an in-flight shutdown of one or more engines , loss ofthrust control , and damage to the aircraft. 

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

### 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.• Mai l: U.S. Department of Transportation, Docket Operations , M-30 , West Building Ground Floor, Room W12-140 , 1200 New Jersey Avenu e 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 General Electric, One Neumann Way , MD Y-75, Cinci nnati , OH; phone: 513-552-2913 ; emai l: geae.aoc @ ge.com; and webs ite: www.GE.com

. Yo u may view this service information at the FAA , Engine & Propeller Directorate, 12 New Eng land Executi ve Park, Burlington , MA. For information on the avai labi lity of this material at the FAA , call 781-238-7125. Exam ining the AD Docket You may examine the AD docket on the Internet at http :/ /www.regulations.gov;

or in person at the Docket Management Faci lity between 9 a.m. and 5 p.m. , Monday tlu·ough Friday, except Federal holidays . The AD docket contai ns 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 avai lab le in the AD docket shortl y after receipt. 

### FOR FURTHER INFORMATION CONTACT : Jason Yang , Aerospace Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New England Executi ve Park, Burlington, MA 0 18 03 ; phone: 781-238-7747 ; fax : 781-238-7199 ; email : Jason.Yang @ faa.gov. 

### SUPPLEMENTARY INFORMATION: Comments Invited We invite yo u to send any written relevant data, views , or arguments about this proposal. Send yo ur comments to an address li sted under the ADDRESSES section. Include " Docket No. FAA

-2013

-0195 ; Directorate Identifier 2013

-NE-08

-AD " at the 2begim1ing 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 http: llwww.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 propose to adopt a new AD for all GE model GEnx-2B67 and GEnx-2B67B turbofan engines with BAI air duct, 

### P I N 2469M32G01 , and support bracket, 

### P I N 2469M46GO I , installed. This proposed AD was prompted by 11 reports of cracks 

### in the BAI air duct, 

### PIN 2469M32GOI , caused by resonant vibration ofthe BAI valve system. Engineering analysis determined that the single support bracket is not sufficient to prevent the vibration and cracking in the BAI air duct, and that additional support brackets are needed. This proposed AD would require initial visual inspection ofthe BAI air duct before it reaches 400 cycles since new (CSN) , and repetitive visual inspections every 100 cycles thereafter. If the BAI air duct fails inspection, the proposed AD would require removal of the BAI air duct from service. As a mandatory terminating action , the proposed AD would also require installation of new BAI air duct support brackets at the next removal of the BAI air duct, and replacement of the BAI air duct with a duct eligible for installation. This condition , if not corrected , could result in failure of the BAI air duct, resulting in an in-flight shutdown of one or more engines , loss of tlu·ust control , and damage to the aircraft.

3Relevant Service Information 

### We reviewed GE Service Bulletin (SB) No. GEnx-2B S/B 75-0006 , dated Jul y 23 , 2012 , and GE SB No. GEnx-2B S/B 75-0008 , Revision 1 , 

### dated February 4 , 2013

. GE SB No. GEnx

-2B S/B 75-0006 describes procedures for inspecting and, if necessary, removing and replacing the BAI air duct. GE SB No. GEnx-2B S/B 75 -000 8, Revision 1 , 

### describes procedures for installing new BAI air duct support brackets , and inspection and possible replacement of BAI air ducts. 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 initial and repetitive visual inspections ofthe BAI air duct, replacement of the BAT air duct if it fails inspection and, as mandatory terminating action, installation of new BAI air duct support brackets. Costs of Compliance 

### We estimate that this proposed AD affects 16 engines installed on airplanes of U.S

. registry. We also estimate that it would take about 4 hours per engine to comply with this proposed AD. The average labor rate is $85 per hour. Required parts would cost about $11 ,000 per engine. Based on these figures , we estimate the cost ofthe proposed AD to U.S

. operators to be $181 ,440. 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 ofthe FAA Administrator. Subtitle VII: Aviation Programs , describes in more detail the scope ofthe Agency ' s authority. 

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### 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 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 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 to the extent that it justifies 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: 

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### 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. 

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

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

### General Electric Company : Docket No. FAA-2013 -01 95; Directorate Identifier 2013- NE-08-AD. 

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

### (b) Affected ADs None. 

### (c) Applicability This AD app lies to all General Electric Company (GE) model GEnx

-2867 and GEnx-2B67B turbofan engines with booster anti-ice (BAI) air duct, part number (PIN) 2469M32G01 , and support bracket, PIN 2469M46G01 , installed. 

### (d) Unsafe Condition This AD was prompted by reports of cracks in the BAI air duct, PIN 2469M32G01. We are issuing this AD to prevent failure ofthe BAI air duct, resulting in

an in-flight shutdown of one or more engines , loss oftlu·u st control , and damage to the aircraft. (e) 

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

6(f) Inspection of BAI Air Duct 

### (1) Perform an initial visual inspection ofthe BAI air duct, 

### P I N 2469M32G01 , for cracks prior to accumulating 400 cycles since new (CSN). (2) Thereafter, repeat the visual inspection within every 100 cycles since last inspection. (3) If cracks in the BAI air duct are found during any inspection required by this AD , remove the BAI air duct from service. (g) Mandatory Terminating Action As mandatory terminating action to the repetitive inspection requirement ofthis AD , at the next removal ofBAI air duct, 

### P I N 2469M32G01 , or ifthe BAI air duct is found cracked , after the effective date ofthis AD , do the following: 

### (1) Install new BAI air duct support brackets , PINs 2550M03G01 , 2548M66G01 , 2548M67P01 , 2550M18G01 , and 2550M17P01. (2) Replace the BAI air duct with one that is eligible for installation. (h) Definitions For the purpose ofthis AD , a BAI air duct that is eligible for installation is one that has accumulated 25 CSN or fewer. (i) 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. (j) Related Information 

### (1) For more information about this AD , contact Jason Yang , Aerospace Engineer, Engine Certification Office , FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington , MA 01803 ; phone: 781

-238-7747 ; fax: 781- 238-7199 ; email: Jason.Yang @ faa.gov.

7(2) Refer to GE Service Bulletin (SB) No. GEnx-2B S/B 75

-0006 , dated Jul y 23 , 2012, and GE SB No. GEnx

-2B S/B 75-0008 , Revision 1 , dated February 4 , 2013 , for guidance on inspecting and , if neces sary, removing and replacing the BAI air duct, as

well as procedures for installation of new BAI air duct support brackets

. (3) For service information identified in this proposed AD, contact General Electric , One Neumann Way , MD Y

-75 , Cincinnati, OH ; phone: 513-552-2913 ; email: geae.aoc @ ge.com; and website: www.GE.com. You may view this service information at the FAA, Engine & Propeller Directorate, 12 New England Executi ve Park, Burlington , MA. For information on the availability of this material at the FAA, call 781-238-71 25.

Robert J. Gm ley , Acting Assistant Manager, Engine & Propeller Directorate, Aircraft Certification Service

.



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