Airworthiness Directives; CFM International, S.A. Engines, 60838-60841 [2024-16473]

Download as PDF 60838 Federal Register / Vol. 89, No. 145 / Monday, July 29, 2024 / Proposed Rules Boeing Alert Requirements Bulletin 737– 22A1399 RB, dated April 13, 2023. (d) Subject Air Transport Association (ATA) of America Code 27, Flight controls. (e) Unsafe Condition This AD was prompted by a report that flight control rigging tolerances could result in spoiler deflection not reaching the minimal level required to engage the cruise thrust split monitor (MONFD) used by the autothrottle (A/T) system. The FAA is issuing this AD to address failure of the spoiler deflection to engage the MONFD. The unsafe condition, if not addressed, could lead to significant throttle split, leading to asymmetric thrust and the subsequent lack of autothrottle disengagement, which could result in an uncommanded roll and consequent loss of control of the airplane, and reduced ability of the flightcrew to maintain the safe flight and landing of the airplane. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Required Actions Except as specified by paragraph (h) of this AD: At the applicable times specified in the ‘‘Compliance’’ paragraph of Boeing Alert Requirements Bulletin 737–22A1399 RB, dated April 13, 2023, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 737–22A1399 RB, dated April 13, 2023. Note 1 to paragraph (g): Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 737–22A1399, dated April 13, 2023, which is referred to in Boeing Alert Requirements Bulletin 737–22A1399 RB, dated April 13, 2023. ddrumheller on DSK120RN23PROD with PROPOSALS1 (h) Exceptions to Requirements Bulletin Specifications Where the Compliance Time columns of the table in the ‘‘Compliance’’ paragraph of Boeing Alert Requirements Bulletin 737– 22A1399 RB, dated April 13, 2023, use the phrase ‘‘the original issue date of Requirements Bulletin 737–22A1399 RB,’’ this AD requires using the effective date of this AD. (i) Alternative Methods of Compliance (AMOCs) (1) The Manager, AIR–520, Continued Operational Safety 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 responsible Flight Standards 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)(1) of this AD. Information may be emailed to: AMOC@ faa.gov. (2) Before using any approved AMOC, notify your appropriate principal inspector, VerDate Sep<11>2014 16:59 Jul 26, 2024 Jkt 262001 or lacking a principal inspector, the manager of the responsible Flight Standards Office. (3) An AMOC that provides an acceptable level of safety may be used for any repair, modification, or alteration required by this AD if it is approved by The Boeing Company Organization Designation Authorization (ODA) that has been authorized by the Manager, AIR–520, Continued Operational Safety Branch, FAA, to make those findings. To be approved, the repair method, modification deviation, or alteration deviation must meet the certification basis of the airplane, and the approval must specifically refer to this AD. (j) Related Information (1) For more information about this AD, contact Eric Igama, Aviation Safety Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198; phone: 562–627–5388; email: roderick.igama@faa.gov. (2) Material identified in this AD that is not incorporated by reference is available at the address specified in paragraph (k)(3) of this AD. (k) Material Incorporated by Reference (1) The Director of the Federal Register approved the incorporation by reference of the material listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51. (2) You must use this material as applicable to do the actions required by this AD, unless the AD specifies otherwise. (i) Boeing Alert Requirements Bulletin 737–22A1399 RB, dated April 13, 2023. (ii) [Reserved] (3) For the material identified in this AD, contact Boeing Commercial Airplanes, Attention: Contractual & Data Services (C&DS), 2600 Westminster Blvd., MC 110– SK57, Seal Beach, CA 90740–5600; telephone 562–797–1717; website myboeingfleet.com. (4) You may view this material at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th Street, Des Moines, WA. For information on the availability of this material at the FAA, call 206–231–3195. (5) You may view this material at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, visit www.archives.gov/federal-register/cfr/ ibr-locations or email fr.inspection@nara.gov. Issued on July 23, 2024. Peter A. White, Deputy Director, Integrated Certificate Management Division, Aircraft Certification Service. [FR Doc. 2024–16474 Filed 7–26–24; 8:45 am] BILLING CODE 4910–13–P PO 00000 Frm 00003 Fmt 4702 Sfmt 4702 DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2024–1898; Project Identifier AD–2023–01013–E] RIN 2120–AA64 Airworthiness Directives; CFM International, S.A. Engines Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: The FAA proposes to adopt a new airworthiness directive (AD) for certain CFM International, S.A. (CFM) Model LEAP–1B engines. This proposed AD was prompted by a report of a quality escape involving certain highpressure compressor (HPC) stage 2 seals manufactured without detailed finish machining, which could result in deeper rubs and mechanical damage to the seal teeth of the stage 3–4 compressor rotor blisk (stage 3–4 blisk) of the mating compressor rotor during initial operation. This proposed AD would require a visual inspection of the HPC stage 2 seal, a visual inspection of the forward arm seal teeth of the stage 3–4 blisk, an eddy current inspection (ECI) of the forward arm seal teeth of the stage 3–4 blisk, and replacement of the HPC stage 2 seal and the stage 3–4 blisk, if necessary. The FAA is proposing this AD to address the unsafe condition on these products. DATES: The FAA must receive comments on this proposed AD by September 12, 2024. 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 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. AD Docket: You may examine the AD docket at regulations.gov under Docket No. FAA–2024–1898; 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, any comments SUMMARY: E:\FR\FM\29JYP1.SGM 29JYP1 60839 Federal Register / Vol. 89, No. 145 / Monday, July 29, 2024 / Proposed Rules received, and other information. The street address for Docket Operations is listed above. Material Incorporated by Reference: • For CFM material identified in this proposed AD, contact CFM International, S.A., GE Aviation Fleet Support, 1 Neumann Way, M/D Room 285, Cincinnati, OH 45215; phone: (877) 432–3272; email: aviation.fleetsupport@ ge.com. • You may view this material at the FAA, Airworthiness Products Section, Operational Safety Branch, 1200 District Avenue, Burlington, MA 01803. For information on the availability of this material at the FAA, call (817) 222– 5110. FOR FURTHER INFORMATION CONTACT: Mehdi Lamnyi, Aviation Safety Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198; phone: (781) 238–7743; email: mehdi.lamnyi@ faa.gov. SUPPLEMENTARY INFORMATION: Comments Invited The FAA invites 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–2024–1898; Project Identifier AD–2023–01013–E’’ at the beginning of your comments. The most helpful comments reference a specific portion of the proposal, explain the reason for any recommended change, and include supporting data. The FAA will consider all comments received by the closing date and may revise this proposal because of those comments. Except for Confidential Business Information (CBI) as described in the following paragraph, and other information as described in 14 CFR 11.35, the FAA will post all comments received, without change, to regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this NPRM. Confidential Business Information CBI is commercial or financial information that is both customarily and actually treated as private by its owner. Under the Freedom of Information Act (FOIA) (5 U.S.C. 552), CBI is exempt from public disclosure. If your comments responsive to this NPRM contain commercial or financial information that is customarily treated as private, that you actually treat as private, and that is relevant or responsive to this NPRM, it is important that you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI as ‘‘PROPIN.’’ The FAA will treat such marked submissions as confidential under the FOIA, and they will not be placed in the public docket of this NPRM. Submissions containing CBI should be sent to Mehdi Lamnyi, Aviation Safety Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198. Any commentary that the FAA receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking. Background The FAA was notified by the manufacturer of a quality escape involving certain HPC stage 2 seals installed on certain CFM Model LEAP– 1B21, LEAP–1B23, LEAP–1B25, LEAP– 1B27, LEAP–1B28, LEAP–1B28B1, LEAP–1B28B2, LEAP–1B28B2C, LEAP– 1B28B3, LEAP–1B28BBJ1, and LEAP– 1B28BBJ2 (LEAP–1B) engines. The suspect HPC stage 2 seals were manufactured without detailed finish machining, which could result in deeper rubs and mechanical damage to the seal teeth of the stage 3–4 blisk of the mating compressor rotor during initial operation, which could lead to failure of the stage 3–4 blisk. This condition, if not addressed, could result in uncontained part release, damage to the engine, and damage to the aircraft. FAA’s Determination The FAA is issuing this NPRM after determining that the unsafe condition described previously is likely to exist or develop on other products of the same type design. Related Material Under 1 CFR Part 51 The FAA reviewed CFM International, S.A. Service Bulletin LEAP–1B–72–00–0394–01A–930A–D, Issue 002–00, dated January 23, 2024, which specifies procedures for an onwing borescope inspection (BSI) of the honeycomb structure of the affected stage 2 seals and rotating seal teeth coating condition and provides instructions for determining the serviceability of affected components that fail the BSI. This material also specifies procedures for an in-shop visual inspection of the HPC stage 2 seal and the forward arm seal teeth of the stage 3–4 blisk, an ECI of the forward arm seal teeth of the stage 3–4 blisk, and replacement of the HPC stage 2 seal and the stage 3–4 blisk. This material 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. Proposed AD Requirements in This NPRM This proposed AD would require a visual inspection of the HPC stage 2 seal and the forward arm seal teeth of the stage 3–4 blisk, an ECI of the forward arm seal teeth of the stage 3–4 blisk, and replacement of the HPC stage 2 seal and the stage 3–4 blisk, if necessary. Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 31 engines installed on airplanes of U.S. registry. The FAA estimates the following costs to comply with this proposed AD: ddrumheller on DSK120RN23PROD with PROPOSALS1 ESTIMATED COSTS Action Labor cost Visual inspection of HPC stage 2 seal ........... Visual inspection of stage 3–4 blisk ............... ECI of stage 3–4 blisk .................................... 1 work-hour × $85 per hour = $85 ................. 1 work-hour × $85 per hour = $85 ................. 4 work-hours × $85 per hour = $340 ............. The FAA estimates the following costs to do any necessary replacements that would be required based on the VerDate Sep<11>2014 16:59 Jul 26, 2024 Jkt 262001 results of the proposed inspection. The agency has no way of determining the PO 00000 Frm 00004 Fmt 4702 Sfmt 4702 Cost per product Parts cost $0 0 0 $85 85 340 Cost on U.S. operators $2,635 2,635 10,540 number of engines that might need these replacements: E:\FR\FM\29JYP1.SGM 29JYP1 60840 Federal Register / Vol. 89, No. 145 / Monday, July 29, 2024 / Proposed Rules ON-CONDITION COSTS Action Labor cost Replacement of HPC stage 2 seal ............................... Replacement of stage 3–4 blisk ................................... 8 work-hours × $85 per hour = $680 ........................... 8 work-hours × $85 per hour = $680 ........................... 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. The FAA is 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. 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) Would not affect intrastate aviation in Alaska, and (3) Would not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act. Regulatory Findings The FAA determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would not The Proposed Amendment List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows: Cost per product Parts cost $55,312 518,500 $55,992 519,180 PART 39—AIRWORTHINESS DIRECTIVES 1. 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: ■ CFM International, S.A.: Docket No. FAA– 2024–1898; Project Identifier AD–2023– 01013–E. (a) Comments Due Date The FAA must receive comments on this airworthiness directive (AD) by September 12, 2024. (b) Affected ADs None. (c) Applicability This AD applies to CFM International, S.A. (CFM) Model LEAP–1B21, LEAP–1B23, LEAP–1B25, LEAP–1B27, LEAP–1B28, LEAP–1B28B1, LEAP–1B28B2, LEAP– 1B28B2C, LEAP–1B28B3, LEAP–1B28BBJ1, and LEAP–1B28BBJ2 engines having an engine serial number (ESN) identified in Table 1 to paragraph (c) of this AD. TABLE 1 TO PARAGRAPH (c)—APPLICABLE ESNS ESN ESN ESN ESN ESN 60A635 60A639 60A642 60A643 60A644 60A645 60A646 60A647 60A650 60A653 60A655 60A656 60A660 60A661 60A662 60A663 60A669 60A670 60A671 60A673 60A676 60A678 60A679 60A682 60A686 60A687 60A689 60A690 60A691 60A696 60A702 ........................................... ........................................... ........................................... ........................................... ddrumheller on DSK120RN23PROD with PROPOSALS1 (d) Subject Joint Aircraft System Component (JASC) Code 7230, Turbine Engine Compressor Section. (e) Unsafe Condition This AD was prompted by a report of a quality escape involving certain highpressure compressor (HPC) stage 2 seals manufactured without detailed finish machining, which could result in deeper rubs and mechanical damage to the seal teeth of the stage 3–4 compressor rotor blisk (stage 3– 4 blisk) of the mating compressor rotor during initial operation. The FAA is issuing this AD to prevent uncontained failure of the stage 3–4 blisk. The unsafe condition, if not addressed, could result in uncontained part VerDate Sep<11>2014 16:59 Jul 26, 2024 Jkt 262001 release, damage to the engine, and damage to the aircraft. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Required Actions (1) Before accumulating 2,900 cycles since new (CSN) or within 10 flight cycles after the effective date of this AD, whichever occurs later, perform the following: (i) A visual inspection of the HPC stage 2 seal in accordance with the Accomplishment Instructions, paragraph 5.B.(3) of CFM Service Bulletin (SB) LEAP–1B–72–00–0394– 01A–930A–D, Issue 002–00, dated January PO 00000 Frm 00005 Fmt 4702 Sfmt 4702 23, 2024 (CFM SB LEAP–1B–72–00–0394– 01A–930A–D, Issue 002–00). (ii) A visual inspection of the forward arm seal teeth of the stage 3–4 blisk in accordance with the Accomplishment Instructions, paragraph 5.B.(4) of CFM SB LEAP–1B–72– 00–0394–01A–930A–D, Issue 002–00. (iii) An eddy current inspection of the forward arm seal teeth of the stage 3–4 blisk in accordance with the Accomplishment Instructions, paragraph 5.B.(5) of CFM SB LEAP–1B–72–00–0394–01A–930A–D, Issue 002–00. (2) If, during the inspection required by paragraph (g)(1)(i) of this AD, any of the HPC stage 2 seal segments fail to meet the serviceability criteria specified in the Accomplishment Instructions, paragraph E:\FR\FM\29JYP1.SGM 29JYP1 Federal Register / Vol. 89, No. 145 / Monday, July 29, 2024 / Proposed Rules 5.B.(3) of CFM SB LEAP–1B–72–00–0394– 01A–930A–D, Issue 002–00, before further flight, remove the unserviceable HPC stage 2 seal segments from service. (3) If, during the inspections required by paragraphs (g)(1)(ii) and (iii) of this AD, the stage 3–4 blisk fails to meet the serviceability criteria specified in the Accomplishment Instructions, paragraph 5.B.(6) of CFM SB LEAP–1B–72–00–0394–01A–930A–D, Issue 002–00, before further flight: (i) Remove the stage 3–4 blisk from service; (ii) Remove all four HPC stage 2 seal segments from service; and (iii) Replace the stage 3–4 blisk in accordance with the Accomplishment Instructions, paragraph 5.B.(7)(a) of CFM SB LEAP–1B–72–00–0394–01A–930A–D, Issue 002–00. (4) If, during the actions required by paragraphs (g)(2) and (3) of this AD, the HPC stage 2 seal is removed, before further flight, replace the HPC stage 2 seal in accordance with the Accomplishment Instructions, paragraph 5.B.(7)(b) of CFM SB LEAP–1B– 72–00–0394–01A–930A–D, Issue 002–00. (h) Alternative Methods of Compliance (AMOCs) (1) The Manager, AIR–520 Continued Operational Safety 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 AIR–520 Continued Operational Safety Branch, send it to the attention of the person identified in paragraph (i) of this AD and email to: 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. ddrumheller on DSK120RN23PROD with PROPOSALS1 (i) Additional Information For more information about this AD, contact Mehdi Lamnyi, Aviation Safety Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198; phone: (781) 238–7743; email: mehdi.lamnyi@faa.gov. (j) Material Incorporated by Reference (1) The Director of the Federal Register approved the incorporation by reference (IBR) of the material listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51. (2) You must use this material as applicable to do the actions required by this AD, unless the AD specifies otherwise. (i) CFM International, S.A. Service Bulletin LEAP–1B–72–00–0394–01A–930A–D, Issue 002–00, dated January 23, 2024. (ii) [Reserved] (3) For CFM material identified in this AD, contact CFM International, S.A., GE Aviation Fleet Support, 1 Neumann Way, M/D Room 285, Cincinnati, OH 45215; phone: (877) 432–3272; email: aviation.fleetsupport@ ge.com. (4) You may view this material at FAA, Airworthiness Products Section, Operational Safety Branch, 1200 District Avenue, Burlington, MA 01803. For information on VerDate Sep<11>2014 16:59 Jul 26, 2024 Jkt 262001 the availability of this material at the FAA, call (817) 222–5110. (5) You may view this material at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, visit www.archives.gov/federal-register/cfr/ ibr-locations or email fr.inspection@nara.gov. Issued on July 23, 2024. Peter A. White, Deputy Director, Integrated Certificate Management Division, Aircraft Certification Service. [FR Doc. 2024–16473 Filed 7–26–24; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2024–1899; Project Identifier MCAI–2023–01169–E] RIN 2120–AA64 Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: The FAA proposes to supersede Airworthiness Directive (AD) 2023–24–06, which applies to certain Rolls-Royce Deutschland Ltd & Co KG (RRD) Model Trent 1000 engines. AD 2023–24–06 requires revising the airworthiness limitation section (ALS) of the operator’s existing approved engine maintenance or inspection program, as applicable, to incorporate new or more restrictive tasks and limitations and associated thresholds and intervals for life-limited parts. Since the FAA issued AD 2023–24–06, the manufacturer revised the time limits manual (TLM) to introduce new or more restrictive tasks and limitations and associated thresholds and intervals for life-limited parts, which prompted this AD. This proposed AD would require revisions to the ALS of the operator’s existing approved engine maintenance or inspection program, as specified in a European Union Aviation Safety Agency (EASA) AD, which is incorporated by reference. The FAA is proposing this AD to address the unsafe condition on these products. DATES: The FAA must receive comments on this NPRM by September 12, 2024. ADDRESSES: You may send comments, using the procedures found in 14 CFR 11.43 and 11.45, by any of the following methods: SUMMARY: PO 00000 Frm 00006 Fmt 4702 Sfmt 4702 60841 • Federal eRulemaking Portal: Go to 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. AD Docket: You may examine the AD docket at regulations.gov under Docket No. FAA–2024–1899; 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 mandatory continuing airworthiness information (MCAI), any comments received, and other information. The street address for Docket Operations is listed above. Material Incorporated by Reference: • For EASA material identified in this proposed AD, contact EASA, KonradAdenauer-Ufer 3, 50668 Cologne, Germany; phone: +49 221 8999 000; email: ADs@easa.europa.eu. You may find this material on the EASA website at ad.easa.europa.eu. • You may view this material at the FAA, Airworthiness Products Section, Operational Safety Branch, 1200 District Avenue, Burlington, MA 01803. For information on the availability of this material at the FAA, call (817) 222– 5110. FOR FURTHER INFORMATION CONTACT: Ethan Carlson, Aviation Safety Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198; phone: (206) 578–2291; email: Ethan.M.Carlson@ faa.gov. SUPPLEMENTARY INFORMATION: Comments Invited The FAA invites 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–2024–1899; Project Identifier MCAI–2023–01169–E’’ at the beginning of your comments. The most helpful comments reference a specific portion of the proposal, explain the reason for any recommended change, and include supporting data. The FAA will consider all comments received by the closing date and may amend the proposal because of those comments. Except for Confidential Business Information (CBI) as described in the following paragraph, and other information as described in 14 CFR 11.35, the FAA will post all comments E:\FR\FM\29JYP1.SGM 29JYP1

Agencies

[Federal Register Volume 89, Number 145 (Monday, July 29, 2024)]
[Proposed Rules]
[Pages 60838-60841]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2024-16473]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2024-1898; Project Identifier AD-2023-01013-E]
RIN 2120-AA64


Airworthiness Directives; CFM International, S.A. Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

-----------------------------------------------------------------------

SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) 
for certain CFM International, S.A. (CFM) Model LEAP-1B engines. This 
proposed AD was prompted by a report of a quality escape involving 
certain high-pressure compressor (HPC) stage 2 seals manufactured 
without detailed finish machining, which could result in deeper rubs 
and mechanical damage to the seal teeth of the stage 3-4 compressor 
rotor blisk (stage 3-4 blisk) of the mating compressor rotor during 
initial operation. This proposed AD would require a visual inspection 
of the HPC stage 2 seal, a visual inspection of the forward arm seal 
teeth of the stage 3-4 blisk, an eddy current inspection (ECI) of the 
forward arm seal teeth of the stage 3-4 blisk, and replacement of the 
HPC stage 2 seal and the stage 3-4 blisk, if necessary. The FAA is 
proposing this AD to address the unsafe condition on these products.

DATES: The FAA must receive comments on this proposed AD by September 
12, 2024.

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 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.
    AD Docket: You may examine the AD docket at regulations.gov under 
Docket No. FAA-2024-1898; 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, any comments

[[Page 60839]]

received, and other information. The street address for Docket 
Operations is listed above.
    Material Incorporated by Reference:
     For CFM material identified in this proposed AD, contact 
CFM International, S.A., GE Aviation Fleet Support, 1 Neumann Way, M/D 
Room 285, Cincinnati, OH 45215; phone: (877) 432-3272; email: 
[email protected].
     You may view this material at the FAA, Airworthiness 
Products Section, Operational Safety Branch, 1200 District Avenue, 
Burlington, MA 01803. For information on the availability of this 
material at the FAA, call (817) 222-5110.

FOR FURTHER INFORMATION CONTACT: Mehdi Lamnyi, Aviation Safety 
Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198; phone: 
(781) 238-7743; email: [email protected].

SUPPLEMENTARY INFORMATION:

Comments Invited

    The FAA invites 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-2024-1898; 
Project Identifier AD-2023-01013-E'' at the beginning of your comments. 
The most helpful comments reference a specific portion of the proposal, 
explain the reason for any recommended change, and include supporting 
data. The FAA will consider all comments received by the closing date 
and may revise this proposal because of those comments.
    Except for Confidential Business Information (CBI) as described in 
the following paragraph, and other information as described in 14 CFR 
11.35, the FAA will post all comments received, without change, to 
regulations.gov, including any personal information you provide. The 
agency will also post a report summarizing each substantive verbal 
contact received about this NPRM.

Confidential Business Information

    CBI is commercial or financial information that is both customarily 
and actually treated as private by its owner. Under the Freedom of 
Information Act (FOIA) (5 U.S.C. 552), CBI is exempt from public 
disclosure. If your comments responsive to this NPRM contain commercial 
or financial information that is customarily treated as private, that 
you actually treat as private, and that is relevant or responsive to 
this NPRM, it is important that you clearly designate the submitted 
comments as CBI. Please mark each page of your submission containing 
CBI as ``PROPIN.'' The FAA will treat such marked submissions as 
confidential under the FOIA, and they will not be placed in the public 
docket of this NPRM. Submissions containing CBI should be sent to Mehdi 
Lamnyi, Aviation Safety Engineer, FAA, 2200 South 216th Street, Des 
Moines, WA 98198. Any commentary that the FAA receives which is not 
specifically designated as CBI will be placed in the public docket for 
this rulemaking.

Background

    The FAA was notified by the manufacturer of a quality escape 
involving certain HPC stage 2 seals installed on certain CFM Model 
LEAP-1B21, LEAP-1B23, LEAP-1B25, LEAP-1B27, LEAP-1B28, LEAP-1B28B1, 
LEAP-1B28B2, LEAP-1B28B2C, LEAP-1B28B3, LEAP-1B28BBJ1, and LEAP-
1B28BBJ2 (LEAP-1B) engines. The suspect HPC stage 2 seals were 
manufactured without detailed finish machining, which could result in 
deeper rubs and mechanical damage to the seal teeth of the stage 3-4 
blisk of the mating compressor rotor during initial operation, which 
could lead to failure of the stage 3-4 blisk. This condition, if not 
addressed, could result in uncontained part release, damage to the 
engine, and damage to the aircraft.

FAA's Determination

    The FAA is issuing this NPRM after determining that the unsafe 
condition described previously is likely to exist or develop on other 
products of the same type design.

Related Material Under 1 CFR Part 51

    The FAA reviewed CFM International, S.A. Service Bulletin LEAP-1B-
72-00-0394-01A-930A-D, Issue 002-00, dated January 23, 2024, which 
specifies procedures for an on-wing borescope inspection (BSI) of the 
honeycomb structure of the affected stage 2 seals and rotating seal 
teeth coating condition and provides instructions for determining the 
serviceability of affected components that fail the BSI. This material 
also specifies procedures for an in-shop visual inspection of the HPC 
stage 2 seal and the forward arm seal teeth of the stage 3-4 blisk, an 
ECI of the forward arm seal teeth of the stage 3-4 blisk, and 
replacement of the HPC stage 2 seal and the stage 3-4 blisk. This 
material 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.

Proposed AD Requirements in This NPRM

    This proposed AD would require a visual inspection of the HPC stage 
2 seal and the forward arm seal teeth of the stage 3-4 blisk, an ECI of 
the forward arm seal teeth of the stage 3-4 blisk, and replacement of 
the HPC stage 2 seal and the stage 3-4 blisk, if necessary.

Costs of Compliance

    The FAA estimates that this AD, if adopted as proposed, would 
affect 31 engines installed on airplanes of U.S. registry.
    The FAA estimates the following costs to comply with this proposed 
AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                     Cost per      Cost on U.S.
                Action                         Labor cost           Parts cost        product        operators
----------------------------------------------------------------------------------------------------------------
Visual inspection of HPC stage 2 seal.  1 work-hour x $85 per                 $0             $85          $2,635
                                         hour = $85.
Visual inspection of stage 3-4 blisk..  1 work-hour x $85 per                  0              85           2,635
                                         hour = $85.
ECI of stage 3-4 blisk................  4 work-hours x $85 per                 0             340          10,540
                                         hour = $340.
----------------------------------------------------------------------------------------------------------------

    The FAA estimates the following costs to do any necessary 
replacements that would be required based on the results of the 
proposed inspection. The agency has no way of determining the number of 
engines that might need these replacements:

[[Page 60840]]



                                               On-Condition Costs
----------------------------------------------------------------------------------------------------------------
                                                                                                     Cost per
                    Action                                 Labor cost               Parts cost        product
----------------------------------------------------------------------------------------------------------------
Replacement of HPC stage 2 seal...............  8 work-hours x $85 per hour =            $55,312         $55,992
                                                 $680.
Replacement of stage 3-4 blisk................  8 work-hours x $85 per hour =            518,500         519,180
                                                 $680.
----------------------------------------------------------------------------------------------------------------

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.
    The FAA is 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

    The FAA 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) Would not affect intrastate aviation in Alaska, and
    (3) Would 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:

CFM International, S.A.: Docket No. FAA-2024-1898; Project 
Identifier AD-2023-01013-E.

 (a) Comments Due Date

    The FAA must receive comments on this airworthiness directive 
(AD) by September 12, 2024.

 (b) Affected ADs

    None.

 (c) Applicability

    This AD applies to CFM International, S.A. (CFM) Model LEAP-
1B21, LEAP-1B23, LEAP-1B25, LEAP-1B27, LEAP-1B28, LEAP-1B28B1, LEAP-
1B28B2, LEAP-1B28B2C, LEAP-1B28B3, LEAP-1B28BBJ1, and LEAP-1B28BBJ2 
engines having an engine serial number (ESN) identified in Table 1 
to paragraph (c) of this AD.

                                    Table 1 to Paragraph (c)--Applicable ESNs
----------------------------------------------------------------------------------------------------------------
         ESN                    ESN                    ESN                    ESN                    ESN
----------------------------------------------------------------------------------------------------------------
             60A635                 60A647                 60A662                 60A678                60A691
             60A639                 60A650                 60A663                 60A679                60A696
             60A642                 60A653                 60A669                 60A682                60A702
             60A643                 60A655                 60A670                 60A686    ....................
             60A644                 60A656                 60A671                 60A687    ....................
             60A645                 60A660                 60A673                 60A689    ....................
             60A646                 60A661                 60A676                 60A690    ....................
----------------------------------------------------------------------------------------------------------------

(d) Subject

    Joint Aircraft System Component (JASC) Code 7230, Turbine Engine 
Compressor Section.

(e) Unsafe Condition

    This AD was prompted by a report of a quality escape involving 
certain high-pressure compressor (HPC) stage 2 seals manufactured 
without detailed finish machining, which could result in deeper rubs 
and mechanical damage to the seal teeth of the stage 3-4 compressor 
rotor blisk (stage 3-4 blisk) of the mating compressor rotor during 
initial operation. The FAA is issuing this AD to prevent uncontained 
failure of the stage 3-4 blisk. The unsafe condition, if not 
addressed, could result in uncontained part release, damage to the 
engine, and damage to the aircraft.

(f) Compliance

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

(g) Required Actions

    (1) Before accumulating 2,900 cycles since new (CSN) or within 
10 flight cycles after the effective date of this AD, whichever 
occurs later, perform the following:
    (i) A visual inspection of the HPC stage 2 seal in accordance 
with the Accomplishment Instructions, paragraph 5.B.(3) of CFM 
Service Bulletin (SB) LEAP-1B-72-00-0394-01A-930A-D, Issue 002-00, 
dated January 23, 2024 (CFM SB LEAP-1B-72-00-0394-01A-930A-D, Issue 
002-00).
    (ii) A visual inspection of the forward arm seal teeth of the 
stage 3-4 blisk in accordance with the Accomplishment Instructions, 
paragraph 5.B.(4) of CFM SB LEAP-1B-72-00-0394-01A-930A-D, Issue 
002-00.
    (iii) An eddy current inspection of the forward arm seal teeth 
of the stage 3-4 blisk in accordance with the Accomplishment 
Instructions, paragraph 5.B.(5) of CFM SB LEAP-1B-72-00-0394-01A-
930A-D, Issue 002-00.
    (2) If, during the inspection required by paragraph (g)(1)(i) of 
this AD, any of the HPC stage 2 seal segments fail to meet the 
serviceability criteria specified in the Accomplishment 
Instructions, paragraph

[[Page 60841]]

5.B.(3) of CFM SB LEAP-1B-72-00-0394-01A-930A-D, Issue 002-00, 
before further flight, remove the unserviceable HPC stage 2 seal 
segments from service.
    (3) If, during the inspections required by paragraphs (g)(1)(ii) 
and (iii) of this AD, the stage 3-4 blisk fails to meet the 
serviceability criteria specified in the Accomplishment 
Instructions, paragraph 5.B.(6) of CFM SB LEAP-1B-72-00-0394-01A-
930A-D, Issue 002-00, before further flight:
    (i) Remove the stage 3-4 blisk from service;
    (ii) Remove all four HPC stage 2 seal segments from service; and
    (iii) Replace the stage 3-4 blisk in accordance with the 
Accomplishment Instructions, paragraph 5.B.(7)(a) of CFM SB LEAP-1B-
72-00-0394-01A-930A-D, Issue 002-00.
    (4) If, during the actions required by paragraphs (g)(2) and (3) 
of this AD, the HPC stage 2 seal is removed, before further flight, 
replace the HPC stage 2 seal in accordance with the Accomplishment 
Instructions, paragraph 5.B.(7)(b) of CFM SB LEAP-1B-72-00-0394-01A-
930A-D, Issue 002-00.

(h) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, AIR-520 Continued Operational Safety 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 AIR-520 Continued 
Operational Safety Branch, send it to the attention of the person 
identified in paragraph (i) of this AD and email to: [email protected].
    (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.

(i) Additional Information

    For more information about this AD, contact Mehdi Lamnyi, 
Aviation Safety Engineer, FAA, 2200 South 216th Street, Des Moines, 
WA 98198; phone: (781) 238-7743; email: [email protected].

(j) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference (IBR) of the material listed in this 
paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
    (2) You must use this material as applicable to do the actions 
required by this AD, unless the AD specifies otherwise.
    (i) CFM International, S.A. Service Bulletin LEAP-1B-72-00-0394-
01A-930A-D, Issue 002-00, dated January 23, 2024.
    (ii) [Reserved]
    (3) For CFM material identified in this AD, contact CFM 
International, S.A., GE Aviation Fleet Support, 1 Neumann Way, M/D 
Room 285, Cincinnati, OH 45215; phone: (877) 432-3272; email: 
[email protected].
    (4) You may view this material at FAA, Airworthiness Products 
Section, Operational Safety Branch, 1200 District Avenue, 
Burlington, MA 01803. For information on the availability of this 
material at the FAA, call (817) 222-5110.
    (5) You may view this material at the National Archives and 
Records Administration (NARA). For information on the availability 
of this material at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations or email [email protected].

    Issued on July 23, 2024.
Peter A. White,
Deputy Director, Integrated Certificate Management Division, Aircraft 
Certification Service.
[FR Doc. 2024-16473 Filed 7-26-24; 8:45 am]
BILLING CODE 4910-13-P
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