AD 2019-02-04

We are superseding Airworthiness Directive (AD) 2018-22-05, which applied to Engine Alliance (EA) GP7270, GP7272, and GP7277 turbofan engines with a certain high-pressure turbine (HPT) case installed. AD 2018-22-05 required removal of affected HPT stator cases (HPT cases) from service and their replacement with a part eligible for installation. This AD retains these requirements, reduces the compliance times for the removal and replacement of certain HPT cases, and identifies additional affected parts that must be removed and replaced. This AD was prompted by the discovery of a quality escape at a manufacturing facility involving unapproved welds on HPT cases. Subsequent additional findings suggested the need for an updated risk analysis, resulting in reduced compliance times for those parts and the identification of additional affected parts. We are issuing this AD to address the unsafe condition on these products.

Final rule; request for comments.

Adoption of the Amendment

Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0 1. The authority citation for part 39 continues to read as follows:

Authority: 49 U.S.C. 106(g), 40113, 44701.

Sec. 39.13 [Amended]

0 2. The FAA amends Sec. 39.13 by removing Airworthiness Directive (AD) 2018-22-05, Amendment 39-19478 (83 FR 55816, November 8, 2018), and adding the following new AD:

2019-02-04 Engine Alliance: Amendment 39-19551; Docket No. FAA-2019- 0050; Product Identifier 2018-NE-35-AD.

(a) Effective Date

This AD is effective February 25, 2019.

(b) Affected ADs

This AD replaces AD 2018-22-05, Amendment 39-19478 (83 FR 55816, November 8, 2018) (``AD 2018-22-05'').

(c) Applicability

This AD applies to Engine Alliance (EA) GP7270, GP7272, and GP7277 turbofan engines, with a high-pressure turbine (HPT) stator case (HPT case),part number (P/N) 2060M40G02 or 2137M29G01 installed, and with HPT case serial numbers (S/Ns) listed in Planning Information, Table 1, of Engine Alliance Alert Service Bulletin EAGP7-A72-401, Revision 1, dated December 13, 2018, and in Planning Information, Table 1, of Engine Alliance Service Bulletin EAGP7-72-399, dated June 4, 2018.

(d) Subject

Joint Aircraft System Component (JASC) Code 7250, Turbine section.

(e) Unsafe Condition

This AD was prompted by the discovery of a quality escape at a manufacturing facility involving unapproved welds on HPT cases. We are issuing this AD to address failure of the HPT case, which could result in engine fire and damage to the airplane.

(f) Compliance

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

(g) Required Actions

(1) For HPT cases listed in Planning Information, Table 1, of Engine Alliance Alert Service Bulletin EAGP7-A72-401,

[[Page 2715]]

Revision No. 1,dated December 13, 2018, remove the affected HPT case from service within the cycles identified in Table 1 of Engine Alliance Alert Service Bulletin EAGP7-A72-401, Revision No. 1, dated December 13, 2018, after the effective date of this AD.
(2) For HPT cases listed in Planning Information, Table 1, of Engine Alliance Service Bulletin EAGP7-72-399, dated June 4, 2018, remove the affected HPT cases from service, using the number of part cycles since new (PCSN) or part cycles since overhaul (PCSO), whichever is less, as specified in Table 1 to paragraph (g)(2) of this AD. [GRAPHIC] [TIFF OMITTED] TR08FE19.000

(3) Replace the removed HPT case with a part eligible for installation before further flight.

(h) Definition

For the purpose of this AD, a ``part eligible for installation'' is any HPT case not identified in paragraph (c) of this AD or an HPT case listed in this AD that has been inspected and repaired by a method approved by the Manager, ECO Branch, FAA.

(i)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 (j) of this AD. You may email your request 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.

(j) Related Information

For more information about this AD, contact Matthew Smith, Aerospace Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: 781-238-7735; fax: 781-238-7199; email: Matthew.C.Smith@faa.gov.

(k)Material Incorporated by Reference

(1) The Director of the Federal Register approved the incorporation by reference (IBR) of the service information listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
(2) You must use this service information as applicable to do the actions required by this AD, unless the AD specifies otherwise.
(3) The following service information was approved for IBR on February 25, 2019.
(i) Engine Alliance Alert Service Bulletin EAGP7-A72-401, Revision No. 1, dated December 13, 2018.
(ii) [Reserved]
(4) The following service information was approved for IBR on November 23, 2018 (83 FR 55816, November 8, 2018).
(i) Engine Alliance Service Bulletin EAGP7-72-399, dated June 4, 2018.
(ii) [Reserved]
(5) For service information identified in this AD, contact Engine Alliance, 411 Silver Lane, East Hartford, CT 06118; phone: 800-565-0140; email: help24@pw.utc.com; website: www.engineallianceportal.com.
(6) You may view this service information at 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.
(7) You may view this service information that is incorporated by reference at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html.

Discussion

We issued AD 2018-22-05, Amendment 39-19478 (83 FR 55816, November 8, 2018) (``AD 2018-22-05''), for EA GP7270, GP7272, and GP7277 turbofan engines with a certain HPT case installed. AD 2018-22-05 required removal of affected HPT cases from service and their replacement with a part eligible for installation. AD 2018-22-05 was prompted by the discovery of a quality escape at a manufacturing facility involving unapproved welds on HPT cases. We issued AD 2018-22- 05 to address failure of the HPT case, which could result in engine fire and damage to the airplane.

Actions Since AD 2018-22-05 Was Issued

Since we issued AD 2018-22-05, another undocumented weld has been found on a part that was previously considered to have enough manufacturing data to perform an updated life analysis. The new findings created more uncertainty about the manufacturing data, creating the need for an updated risk analysis with the new information. As a result, we have determined that the remaining cycles allowed on the affected HPT cases must be reduced and additional affected parts were identified that must be removed and replaced.

Related Service Information Under 1 CFR Part 51

We reviewed Engine Alliance Alert Service Bulletin EAGP7-A72-401, Revision No. 1, dated December 13, 2018, which describes procedures for removing and replacing the affected HPT case within the identified cycles.
We also reviewed Engine Alliance Service Bulletin EAGP7-72-399, dated June 4, 2018, which describes procedures for removing and replacing the affected HPT case within the specified part cycles since new or part cycles since overhaul.
This service information is reasonably available 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 issuing 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.

AD Requirements

This AD requires removal of the affected HPT cases from service and their replacement with a part eligible for installation.

FAA's Justification and Determination of the Effective Date

An unsafe condition exists that requires the immediate adoption of this AD without providing an opportunity for public comments prior to adoption. The FAA has found that the risk to the flying public justifies waiving notice and comment prior to adoption of this rule because failure of the HPT case

[[Page 2714]]

could result in engine fire and damage to the airplane, and the compliance time for the required action is shorter than the time necessary for public comment and publication of the final rule. Additionally, no domestic operators currently use this product. We find good cause that notice and opportunity for prior public comment are impracticable and unnecessary. In addition, for the reasons stated above, we find that good cause exists for making this amendment effective in less than 30 days.

Comments Invited

This AD is a final rule that involves requirements affecting flight safety and was not preceded by notice and an opportunity for public comment. However, we invite you to send any written data, views, or arguments about this final rule. Send your comments to an address listed under the ADDRESSES section. Include the docket number FAA-2019- 0050 and Product Identifier 2018-NE-35-AD at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of this final rule. We will consider all comments received by the closing date and may amend this final rule 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 posta report summarizing each substantive verbal contact we receive about this final rule.

Costs of Compliance

We estimate that this AD affects 0 engines installed on airplanes of U.S. registry. We estimate the following costs to comply with this AD:

Estimated Costs ----------------------------------------------------------------------------------------------------------------
Cost per Cost on U.S.
Action Labor cost Parts cost product operators ---------------------------------------------------------------------------------------------------------------- HPT case replacement.................. 20 work-hours x $85 per $339,400 $341,100 $0
hour = $1,700. ----------------------------------------------------------------------------------------------------------------

Authority for This Rulemaking

Title 49 of the United States Code specifies the FAA's authority to issue ruleson 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.

Regulatory Findings

We have determined that this AD will not have federalism implications under Executive Order 13132. This AD will 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 that this AD:
(1) Is not a ``significant regulatory action'' under Executive Order 12866,
(2) Is not a ``significant rule'' under 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 ornegative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.