[Docket No. FAA-2009-1100; Directorate Identifier 2009-NE-37-AD] 

RJN 2120-AA64 

Airworthiness Directives; International Aero Engines AG Turbofan Engines 

AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). 

SUMMARY: We propose to supersede airworthiness directive (AD) 2012-09-09 that 

applies to all International Aero Engines AG (IAE) V2500-A1, V2525-D5, and V2528-

D5 turbofan engines, and certain serial numbers (SINs) ofiAE V2522-A5, V2524-A5, 

V2527-A5, V2527E-A5, V2527M-A5, V2530-A5, and V2533-A5 turbofan engines. AD 

2012-09-09 currently requires cleaning, eddy current inspection (ECI) or fluorescent 

penetrant inspection (FPI), and initial and repetitive ultrasonic inspections (USis) of 

certain high-pressure compressor (HPC) stage 3 to 8 drums, as well as replacement of the 

drum attachment nuts. Since we issued AD 2012-09-09, we discovered that additional 

attachment nuts for certain HPC stage 3 to 8 drums are affected. This proposed AD 

would expand the affected population for initial and repetitive USis ofthe HPC stage 3 to 

8 drum, revise the inspection intervals, require removal of the affected attachment nuts 

and any HPC stage 3 to 8 drum found cracked, and require a mandatory terminating action. We are proposing this AD to prevent failure of the HPC stage 3 to 8 drum, which 

could result in uncontained drum failure, 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 IN THE FEDERAL REGISTER). 
• 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: 860-368-3700; fax: 860-

368-4600; email: iaeinfo@iaev2500.com; Internet: https://www.iaeworld.com. You may 

view this service information at the FAA, Engine & Propeller Directorate, 12 New 

England Executive Park, Burlington, MA. For information on the availability of this 

material at the FAA, call781-238-7125. 

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. F AA-2009-11 00; 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 NPRM, 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: Martin Adler, Aerospace Engineer, 

Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New England 

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We invite you to send any written relevant data, views, or arguments about this 

NPRM. Send your comments to an address listed under the ADDRESSES section. 

Include "Docket No. F AA-2009-11 00; Directorate Identifier 2009-NE-3 7 -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 

On May 2, 2012, we issued AD 2012-09-09, Amendment 39-17044 (77 FR 

30371, May 23, 2012), ("AD 2012-09-09"), for all IAE V2500-A1, V2525-D5, and 

V2528-D5 turbofan engines, and certain SINs ofiAE V2522-A5, V2524-A5, V2527-A5, 

V2527E-A5, V2527M-A5, V2530-A5, and V2533-A5 turbofan engines. AD 2012-09-09 

requires cleaning, ECI or FPT, and initial and repetitive USis of certain HPC stage 3 to 8 

drums, as well as replacement of the drum attachment nuts. AD 2012-09-09 resulted from 

inspections that found 50 HPC drums with cracks and reports that indicated that the 

required inspection intervals were not adequate. We issued AD 2012-09-09 to prevent 

uncontained failure of the HPC stage 3 to 8 drum, which could result in damage to the 

airplane. 

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Relevant Service Information 

We reviewed IAE Alert Non-Modification Service Bulletin (NMSB) No. V2500-

ENG-72-0615, Revision 6, dated September 4, 20 14; IAE NMSB No. V2500-ENG-72-

0625, dated September 20, 2011; and IAE NMSB No. V2500-ENG-72-0637, dated May 

2, 2013. IAE Alert NMSB No. V2500-ENG-72-0615 describes procedures for 

performing a USI of the HPC stage 3 to 8 drum. IAE NMSB No. V2500-ENG-72-0625 

provides guidance on performing an ECI that will improve the ability to detect cracked 

HPC stage 3 to 8 drums. IAE NMSB No. V2500-ENG-72-0637 describes procedures for 

performing an FPI of the HPC stage 3 to 8 drum. 

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 expand the affected population for initial and repetitive 

US Is of the HPC stage 3 to 8 drum, revise the inspection intervals, require removal of 

affected attachment nuts, and require removal of any HPC stage 3 to 8 drums found 

cracked. As mandatory terminating action, this proposed AD would require installation of 

an HPC stage 3 to 8 drum that has never operated with silver-plated nuts using silver-free 

nuts to attach the HPC stage 3 to 8 drum to the HPC stage 9 to 12 drum. 

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We also estimate that removing silver residue from the HPC stage 3 to 8 drum would cost 

about $2,600 per engine, and required parts would cost about $1,060 per engine. We 

estimate the pro-rated replacement cost to replace an HPC stage 3 to 8 drum to be 

$52,014. Based on these figures, we estimate the cost of this proposed AD on U.S. 

operators to be $53,630,644. 

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 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. 

Regulatory Findings 

We have 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. 

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(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 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 

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 removing airworthiness directive (AD) 2012-09-

09, Amendment 39-17044 (77 FR 30371, May 23, 2012), and adding the following new 

AD: 

International Aero Engines AG: Docket No. FAA-2009-1100; Directorate 

Identifier 2009-NE-37-AD. 

(a) Comments Due Date 

The FAA must receive comments on this AD action by [INSERT DATE 60 

DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. 

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This AD applies to: 

(1) All International Aero Engines AG (IAE) V2500-Al turbofan engines; and 

(2) All IAE V2525-D5 and V2528-D5 turbofan engines; and 

(3) IAE V2522-A5, V2524-A5, V2527-A5, V2527E-A5, V2527M-A5, V2530-

A5, and V2533-A5 turbofan engines with serial numbers (SINs) V10001 through 

Vl3190, and V15001 through V16728, excluding Vl6707. 

(d) Unsafe Condition 

This AD was prompted by the discovery that additional attachment nuts for 

certain HPC stage 3 to 8 drums cause the drum to corrode and crack. We are issuing this 

AD to prevent failure of the HPC stage 3 to 8 drum, which could result in uncontained 

drum failure, damage to the engine, and damage to the airplane. 

(e) Compliance 

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

Use paragraph 3.A. ofiAE Alert Non-Modification Service Bulletin (NMSB) No. 

V2500-ENG-72-A0615, Revision 6, dated September 4, 2014, to do the ultrasonic 

inspection (USI) required by this AD. You may use the inspections listed in paragraph 

(g)(3) of this AD .instead of a USI for the initial inspection required by paragraphs (e)(l) 

through (e)(S) of this AD. If cracks are found during any of the inspections required by 

this AD, remove the drum from service before further flight. 

(1) Initial USI of the HPC stage 3 to 8 drum- Group "A" and Group "B": 

For IAE V2500-Al turbofan engines with SINs listed in "Group A" or "Group B" 

in paragraph l.E. in IAE Alert NMSB No. V2500-ENG-72-A0615, Revision 6, dated 

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For IAE V2SOO-AS turbofan engines with SINs listed in "Group C" in paragraph 

l.E. in IAE Alert NMSB No. V2SOO-ENG-72-A061S, Revision 6, dated September 4, 

2014, perform an initial USI ofthe HPC stage 3 to 8 drum within 200 cycles of 

accumulating 6,2SO CSN or within 200 cycles from the effective date of this AD, 

whichever occurs later. 

(3) Initial USI of the HPC stage 3 to 8 drum - Group "D": 

For IAE V2SOO-AS turbofan engines with SINs listed in "Group D" in paragraph 

l.E. in IAE Alert NMSB No. V2SOO-ENG-72-A061S, Revision 6, dated September 4, 

2014, perform an initial USI of the HPC stage 3 to 8 drum within 200 cycles of 

accumulating 3,7SO CSN or within 200 cycles from the effective date of this AD, 

whichever occurs later. 

(4) Initial USI of the HPC stage 3 to 8 drum - Group "E": 

For IAE V2SOO-A I, -AS, and -OS turbofan engines not listed in "Group A," 

"Group B," "Group C," or "Group D," and with drum assembly part numbers (PINs) 

listed in "GroupE" in paragraph I.E. in IAE Alert NMSB No. V2500-ENG-72-A0615, 

Revision 6, dated September 4, 2014, perform an initial USI of the HPC stage 3 to 8 

drum within 200 cycles of accumulating 12,500 CSN or within 200 cycles from the 

effective date of this AD, whichever occurs later. 

(5) Initial USI of the HPC stage 3 to 8 drum- Group "F": 

For IAE V2500-A 1, -AS, and - D5 turbofan engines not listed in "Group A," 

"Group B," "Group C," or ''Group D," and with drum assembly PINs listed in '·Group F" 

in paragraph I.E. in IAE Alert NMSB No. V2500-ENG-72-A061S, Revision 6, dated 

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(1) For engines included in "Group A," "Group B," ''Group C," "GroupE," or 

"Group F," as defined in paragraph (e) of this AD, perform repetitive USis of the HPC 

stage 3 to 8 drum within every 750 cycles of the last US I. 

(2) For engines included in "Group D," as defined in paragraph (e) of this AD, 

perform repetitive USis of the HPC stage 3 to 8 drum within every 500 cycles ofthe last 

US I. 

(3) If you inspect the HPC stage 3 to 8 drum at shop visit, you may delay the next 

USI as shown in the "Grace Periods Table" for each compliance group listed in paragraph 

1.E. in IAE Alert NMSB No. V2500-ENG-72-A0615, Revision 6, dated September 4, 

2014. 

(g) Removal of Silver-Plated Nuts 

Unless already done, at the next piece-part exposure of the HPC stage 3 to 8 drum 

after the effective date of this AD, do the following before returning any HPC stage 3 to 8 

drum to service: 

(1) Remove from service all silver-plated nuts (fully or partially-plated), PINs 

AS44862 or AS64367, that attach the HPC stage 3 to 8 drum to the HPC stage 9 to 12 

drum. 

(2) Remove the silver residue from the HPC stage 3 to 8 drum. (3) Perform an inspection ofthe HPC stage 3 to 8 drum using at least one of the 

following methods: 

(i) Fluorescent penetrant inspection (FPI) of the HPC stage 3 to 8 drum for cracks, 

or 

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(i) Mandatory Terminating Action 

Within 9,450 cycles after the effective date of this AD, install: 

(1) an HPC stage 3 to 8 drum that has never operated with silver-plated nuts (fully 

or partially plated) to attach the HPC stage 3 to 8 drum to the HPC stage 9 to 12 drum, 

with 

(2) silver-free nuts to attach the HPC stage 3 to 8 drum to the HPC stage 9 to 12 

drum. 

U) Definition 

For the purpose of this AD, "piece-part exposure" is removal of the HPC stage 3 

to 8 drum from the engine, removal of all blades from the drum, and separation of the 

HPC stage 3 to 8 drum from the stage 9 to 12 drum. 

(k) Credit for Previous Actions 

If you performed an inspection of the HPC stage 3 to 8 drum before the effective 

date of this AD using one of the following IAE NMSBs, you met the initial inspection 

requirement of paragraph (e) ofthis AD: 

(i) IAE NMSB No. V2500-ENG-72-0594, Revision 3, dated August 7, 2009, 

through Revision 6, dated April 12, 2010. 

(ii) IAE NMSB No. V2500-ENG-72-0603, Revision 2, dated March 17, 2010, or 

earlier revisions. 

(iii) IAE NMSB No. V2500-ENG-72-0608, Revision 3, dated September 20, 

2011, or earlier revisions. 

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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. 

(m) Related Information 

(1) For more information about this AD, contact Martin Adler, Aerospace 

Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New 

England Executive Park, Burlington, MA 01803; phone: 781-238-7157; fax: 781-238-

7199; email: martin.adler@faa.gov. 

(2) IAE NMSB No. V2500-ENG-72-0637, dated May 2, 2013; IAE NMSB No. 

V2500-ENG-72-0625, dated September 20, 2011; IAE Engine Manual Task 72-41-11-

200-001; and IAE Engine Manual Task 72-41-11-110-001, which are not incorporated by 

reference in this AD, can be obtained from IAE, using the contact information in 

paragraph (m)(3) of this proposed AD. IAE NMSB No. V2500-ENG-72-0637 and IAE 

Engine Manual Task 72-41-11-200-001 provide guidance on performing the FPI. 

Guidance on performing the ECI can be found in IAE NMSB No. V2500-ENG-72-0625. 

IAE Engine Manual Task 72-41-11-110-001 provides guidance on cleaning the HPC 

stage 3 to 8 drum. 

(3) For service information identified in this AD, 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. 

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Issued in Burlington, Massachusetts, on December 16, 2014. 

Colleen M. D' Alessandro, 

Assistant Manager, Engine & Directorate, 

Aircraft Certification Service. 

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