Federal Aviation Administration (FAA), DOT.
Notice of proposed rulemaking (NPRM).
We propose to adopt a new airworthiness directive (AD) for certain General Electric Company (GE) GEnx-2B67, -2B67B, and -2B67/P turbofan engines. This proposed AD was prompted by low-cycle fatigue (LCF) cracking of the fuel manifold leading to an engine fire. This proposed AD would require removal from service of certain fuel manifolds at the next engine shop visit and their replacement with parts eligible for installation. We are proposing this AD to address the unsafe condition on these products.
We must receive comments on this proposed AD by September 17, 2018.
You may send comments, using the procedures found in 14 CFR 11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments.
Mail: U.S. Department of Transportation, 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 General Electric Company, GE Aviation, Room 285, 1 Neumann Way, Cincinnati, OH 45215; phone: 513-552-3272; email: firstname.lastname@example.org. You may view this service information at the FAA, Engine and Propeller Standards Branch, 1200 District Avenue, Burlington, MA 01803. For information on the availability of this material at the FAA, call 781-238-7759.
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-2018-0633; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this NPRM, the regulatory evaluation, any comments received, and other information. The street address for Docket Operations (phone: 800-647-5527) is listed above. Comments will be available in the AD docket shortly after receipt.
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FOR FURTHER INFORMATION CONTACT:
Herman Mak, Aerospace Engineer, ECO Branch, FAA, 1200 District Ave., Burlington, MA 01803; phone: 781-238-7147; fax: 781-238-7199; email: email@example.com.
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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-2018-0633; Product Identifier 2018-NE-22-AD” at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of this NPRM. We will consider all comments received by the closing date and may amend this NPRM because of those comments.
We will post all comments we receive, without change, to http://Start Printed Page 38087www.regulations.gov, including any personal information you provide. We will also post a report summarizing each substantive verbal contact we receive about this NPRM.
We received information concerning a fire in the under-cowl compartment of a GE GEnx-2B turbofan engine. Insufficient bushing clearance in the fuel manifold bracket resulted in additional fuel manifold loads, premature manifold cracking, fuel leakage, and fuel ignition. Twelve fuel manifolds were found to have LCF cracks. Three of these twelve cracked fuel manifolds resulted in a fire. This condition, if not addressed, could result in failure of the fuel manifold, engine fire, and damage to the airplane.
Related Service Information
We reviewed GE GEnx-2B Service Bulletin (SB) 73-0038 R02, dated November 19, 2015. The SB describes procedures for removing and replacing the fuel manifold system with parts eligible for installation.
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 of the same type design.
Proposed AD Requirements
This proposed AD would require removal from service of certain fuel manifolds at the next engine shop visit and their replacement with parts eligible for installation.
Costs of Compliance
We estimate that this proposed AD affects two engines installed on airplanes of U.S. registry.
We estimate the following costs to comply with this proposed AD:
|Action||Labor cost||Parts cost||Cost per product||Cost on U.S. operators|
|Replace fuel manifolds||220 work-hours × $85 per hour = $18,700||$119,485||$138,185||$276,370|
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 of the FAA Administrator.
Subtitle VII: Aviation Programs, describes in more detail the scope of the 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 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 of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.
This AD is issued in accordance with authority delegated by the Executive Director, Aircraft Certification Service, as authorized by FAA Order 8000.51C. In accordance with that order, issuance of ADs is normally a function of the Compliance and Airworthiness Division, but during this transition period, the Executive Director has delegated the authority to issue ADs applicable to engines, propellers, and associated appliances to the Manager, Engine and Propeller Standards Branch, Policy and Innovation Division.
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 of power 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, and
(4) Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.
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- Air transportation
- Aviation safety
- Incorporation by reference
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
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1. The authority citation for part 39 continues to read as follows: End Amendment Part
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2. The FAA amends § 39.13 by adding the following new airworthiness directive (AD): End Amendment Part
General Electric Company: Docket No. FAA-2018-0633; Product Identifier 2018-NE-22-AD.
(a) Comments Due Date
We must receive comments by September 17, 2018.
(b) Affected ADs
This AD applies to General Electric Company (GE) GEnx-2B67, -2B67B, and -2B67/P turbofan engines with top main fuel manifolds, part numbers (P/Ns) 2419M11G01, 2561M11G01, or 2546M11G01, or lower fuel manifolds, P/Ns 2419M12G01, 2561M12G01, or 2546M12G01, installed.
Joint Aircraft System Component (JASC) Code 7310, Engine Fuel Distribution.
(e) Unsafe Condition
This AD was prompted by low-cycle fatigue cracking of the fuel manifold leading to an engine fire. We are issuing this AD to prevent the failure of the fuel manifold. The unsafe condition, if not addressed, could result in failure of the fuel manifold, engine fire, and damage to the airplane.
Comply with this AD within the compliance times specified, unless already done.
(g) Required Actions
At the next engine shop visit, remove the applicable fuel manifolds from service and replace with parts eligible for installation.Start Printed Page 38088
(h) Installation Prohibition
After the effective date of this AD, do not install top main fuel manifolds, P/Ns 2419M11G01, 2561M11G01, or 2546M11G01, or lower fuel manifolds, P/Ns 2419M12G01, 2561M12G01, or 2546M12G01.
For the purpose of this AD, an “engine shop visit” is the induction of an engine into the shop for maintenance involving the separation of pairs of major mating engine case flanges, except for the following situations, which do not constitute an engine shop visit:
(1) Separation of engine flanges solely for the purposes of transportation of the engine without subsequent maintenance.
(2) Separation of engine flanges solely for the purposes of replacing the fan or propulsor without subsequent maintenance.
(j) Alternative Methods of Compliance (AMOCs)
(1) The Manager, ECO Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the certification office, send it to the attention of the person identified in paragraph (k)(1) of this AD. Information may be emailed to: ANE-AD-AMOC@faa.gov.
(2) Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/certificate holding district office.
(k) Related Information
(1) For more information about this AD, contact Herman Mak, Aerospace Engineer, ECO Branch, FAA, 1200 District Ave., Burlington, MA 01803; phone: 781-238-7147; fax: 781-238-7199; email: firstname.lastname@example.org.
(2) For service information identified in this AD, contact General Electric Company, GE Aviation, Room 285, 1 Neumann Way, Cincinnati, OH 45215; phone: 513-552-3272; email: email@example.com. You may view this referenced service information at the FAA, Engine and Propeller Standards Branch, 1200 District Avenue, Burlington, MA 01803. For information on the availability of this material at the FAA, call 781-238-7759.
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Issued in Burlington, Massachusetts, on July 27, 2018.
Karen M. Grant,
Acting Manager, Engine and Propeller Standards Branch, Aircraft Certification Service.
[FR Doc. 2018-16515 Filed 8-2-18; 8:45 am]
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