Document ID: FAA-2019-0274-0001
Agency: faa
Document Type: Proposed Rule
Title: Airworthiness Directives: International Aero Engines AG Turbofan Engines
Posted Date: 2019-05-20T04:00Z

[Federal Register Volume 84, Number 97 (Monday, May 20, 2019)]
[Proposed Rules]
[Pages 22740-22743]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2019-10231]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2019-0274; Product Identifier 2019-NE-07-AD]
RIN 2120-AA64

Airworthiness Directives; International Aero Engines AG Turbofan 
Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: We propose to adopt a new airworthiness directive (AD) for all 
International Aero Engines AG (IAE) V2525-D5 and V2528-D5 model 
turbofan engines. This proposed AD was prompted by reports of cracked 
turbine exhaust cases (TECs). This proposed AD would require initial 
and repetitive inspections of the affected TEC and,

[[Page 22741]]

depending on the results of the inspections, its replacement with a 
part eligible for installation. We are proposing this AD to address the 
unsafe condition on these products.

DATES: We must receive comments on this proposed AD by July 5, 2019.

ADDRESSES: 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.
     Fax: 202-493-2251.
     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 
International Aero Engines AG, 400 Main Street, East Hartford, CT, 
06118; phone: 800-565-0140; email: help24@pw.utc.com; internet: http://fleetcare.pw.utc.com. 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-2019-
0274; 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.

FOR FURTHER INFORMATION CONTACT: Martin Adler, Aerospace Engineer, ECO 
Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: 781-
238-7157; fax: 781-238-7199; email: Martin.Adler@faa.gov.

SUPPLEMENTARY 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-2019-0274; 
Product Identifier 2019-NE-07-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://www.regulations.gov, including any personal information you provide. We 
will also post a report summarizing each substantive verbal contact we 
receive about this NPRM.

Discussion

    We learned of cracks along the rear mount stiffener rails on three 
IAE V2525-D5 and V2528-D5 model turbofan engine TECs that were found 
during routine inspections. After an investigation, IAE concluded that 
the cracks were due to corrosion pitting at a high-stress location. 
This condition, if not addressed, could result in failure of the TEC, 
engine separation, and loss of the airplane.

Related Service Information Under 1 CFR Part 51

    We reviewed IAE Non-Modification Service Bulletin (NMSB) V2500-ENG-
72-0694, Revision No. 2, dated July 2, 2018. The NMSB describes 
procedures for detecting any cracks that develop along the rear mount 
stiffener rail on the TEC. 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 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 initial and repetitive inspections 
of the affected TEC and, depending on the results of the inspections, 
its replacement with a part eligible for installation.

Costs of Compliance

    We estimate that this proposed AD affects 173 engines installed on 
airplanes of U.S. registry.
    We estimate the following costs to comply with this proposed AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                     Cost per      Cost on U.S.
                Action                         Labor cost           Parts cost        product        operators
----------------------------------------------------------------------------------------------------------------
Inspect turbine exhaust case..........  3 work-hours x $85 per                $0            $255         $44,115
                                         hour = $255.
----------------------------------------------------------------------------------------------------------------

    We estimate the following costs to do any necessary replacements 
that would be required based on the results of the proposed inspection. 
We have no way of determining the number of aircraft that might need 
this replacement:

                                               On-Condition Costs
----------------------------------------------------------------------------------------------------------------
                                                                                                     Cost per
                    Action                                 Labor cost               Parts cost        product
----------------------------------------------------------------------------------------------------------------
Replace turbine exhaust case..................  2 work-hours x $85 per hour =           $725,000        $725,170
                                                 $170.
----------------------------------------------------------------------------------------------------------------

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,

[[Page 22742]]

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 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.

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

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 adding the following new airworthiness 
directive (AD):

International Aero Engines AG: Docket No. FAA-2019-0274; Product 
Identifier 2019-NE-07-AD.

(a) Comments Due Date

    We must receive comments by July 5, 2019.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to all International Aero Engines AG (IAE) 
V2525-D5 and V2528-D5 model turbofan engines.

(d) Subject

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

(e) Unsafe Condition

    This AD was prompted by reports of a cracked turbine exhaust 
case (TEC). We are issuing this AD to prevent failure of the TEC. 
The unsafe condition, if not addressed, could result in engine 
separation and loss of the airplane.

(f) Compliance

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

(g) Required Actions

    (1) At the next engine shop visit, but not later than 4,000 
flight cycles (FCs) after the effective date of this AD, perform an 
eddy current inspection (ECI) and high sensitivity fluorescent 
penetrant inspection (FPI) of the TEC front and rear mount stiffener 
rails for cracking indications as follows:
    (i) Perform an ECI using the Accomplishment Instructions, Part 
I--For Engines Installed on Aircraft, paragraphs 2 through 19 
inclusive, or Part II--For Engines Not Installed on Aircraft, 
paragraphs 2 through 18 inclusive, of IAE Non-Modification Service 
Bulletin (NMSB) V2500-ENG-72-0694, Revision No. 2, dated July 2, 
2018 (``IAE NMSB V2500-ENG-72-0694'').
    (ii) If a rejectable indication was found during the ECI, 
perform a local high sensitivity FPI to confirm a crack.
    (iii) If a rejectable indication was found during the ECI, but 
no crack(s) were confirmed using the local high sensitivity FPI, 
then clean, blend and repeat the ECI in the local area of the part. 
Use the Accomplishment Instructions, Part I--For Engines Installed 
on Aircraft, paragraph 20.A.(3), or Part II--For Engines Not 
Installed on Aircraft, paragraph 19.A.(3), of IAE NMSB V2500-ENG-72-
0694 to perform the cleaning and blending. Use the Accomplishment 
Instructions, Part I--For Engines Installed on Aircraft, paragraphs 
2 through 19 inclusive, or Part II--For Engines Not Installed on 
Aircraft, paragraphs 2 through 18 inclusive, of IAE NMSB V2500-ENG-
72-0694 to perform the repeat ECI.
    (iv) If a rejectable indication was again found during the 
repeat ECI, then repeat the local high sensitivity FPI inspection in 
the local area of the part. If the local high sensitivity FPI does 
not confirm a crack, follow the instructions in the Accomplishment 
Instructions, Part I--For Engines Installed on Aircraft, paragraph 
20.A.(5)(a), or Part II--For Engines Not Installed on Aircraft, 
paragraph 19.A.(5)(a), of IAE NMSB V2500-ENG-72-0694.
    (2) If no cracks were found, within 2,000 FCs since the last 
inspection, and thereafter, repeat the inspections of paragraphs 
(g)(1)(i) through (iv) of this AD.
    (3) If a crack was confirmed during the FPI and visual 
inspection required by paragraphs (g)(1)(ii) or (iv), before further 
flight, remove the part from service and replace with a part 
eligible for installation.

(h) Credit for Previous Actions

    You may take credit for the inspections required by paragraph 
(g)(1) of this AD if you performed these inspections before the 
effective date of this AD, using IAE NMSB V2500-ENG-72-0694, 
Revision No. 1, dated February 7, 2018; or IAE NMSB V2500-ENG-72-
0694, Original Issue, dated January 5, 2018.

(i) No Reporting Requirement

    No reporting requirement contained within the NMSB referenced in 
paragraph (g) of this AD is required by this AD.

(j) Definition

    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 that 
the separation of engine flanges solely for the purposes of 
transportation without subsequent engine maintenance does not 
constitute an engine shop visit.

(k) Special Flight Permit

    A special flight permit is not permitted if the crack indication 
extends past the mount stiffener rail or if there is evidence of an 
FPI indication on the outer diameter of the case.

(l) 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 (m)(1) 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

[[Page 22743]]

of the local flight standards district office/certificate holding 
district office.

(m) Related Information

    (1) For more information about this AD, contact Martin Adler, 
Aerospace Engineer, ECO Branch, FAA, 1200 District Avenue, 
Burlington, MA 01803; phone: 781-238-7157; fax: 781-238-7199; email: 
Martin.Adler@faa.gov.
    (2) For service information identified in this AD, contact 
International Aero Engines AG, 400 Main Street, East Hartford, CT 
06118; phone: 800-565-0140; email: help24@pw.utc.com; internet: 
http://fleetcare.pw.utc.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.

    Issued in Burlington, Massachusetts, on May 13, 2019.
Robert J. Ganley,
Manager, Engine and Propeller Standards Branch, Aircraft Certification 
Service.
[FR Doc. 2019-10231 Filed 5-17-19; 8:45 am]
BILLING CODE 4910-13-P