Airworthiness Directives; CFM International, S.A. Turbofan Engines, 2563-2566 [2022-00509]

Download as PDF Federal Register / Vol. 87, No. 11 / Tuesday, January 18, 2022 / Proposed Rules related to the laser’s classification. Like the warning information to be provided at the location of the laser system’s installation, the purpose of this condition is to ensure any person maintaining the system is aware of the hazards, including those related to the use of magnifying glasses or binoculars. Condition 5 requires the applicant to update the airplane operating limitations and information required under 14 CFR 25.1581. The airplane flight-manual supplement insert must describe the intended function of the missile-defense system, its intended operation, and the phases of flight in which it may be used. The insert also must add a caution that describes the significant risk of injury the missiledefense system poses to others while in proximity to other aircraft, airports, and populated areas. These proposed special conditions contain the additional safety standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards. After considering public comment, should the FAA impose these special conditions on the applicant, and issue a supplemental type certificate for the installation of this system, such approvals would not constitute approval to operate the system. FAA Advisory Circular 70–1, ‘‘Outdoor Laser Operations,’’ provides guidance on obtaining operational approval. Applicability As discussed above, these proposed special conditions are applicable to the Airbus Model A321–200 airplane, as modified by FedEx, with the laser-based missile-defense system installed. Should FedEx apply at a later date for a supplemental type certificate to modify any other model included on Type Certificate No. A28NM to incorporate the same novel or unusual design feature, these special conditions would apply to that model as well. khammond on DSKJM1Z7X2PROD with PROPOSALS Conclusion This action affects only a certain novel or unusual design feature on one model of airplane. It is not a rule of general applicability and affects only the applicant. List of Subjects in 14 CFR Part 25 Aircraft, Aviation safety, Reporting and recordkeeping requirements. Authority: 49 U.S.C. 106(f), 106(g), 40113, 44701, 44702, 44704. VerDate Sep<11>2014 16:30 Jan 14, 2022 Jkt 256001 The Proposed Special Conditions DEPARTMENT OF TRANSPORTATION Accordingly, the Federal Aviation Administration (FAA) proposes the following special conditions as part of the type certification basis for the Airbus Model A321–200 airplane with a laser-based missile-defense system, as modified by FedEx. 1. The system must have means that prevent the inadvertent activation of the system on the ground, including during airplane maintenance and ground handling. Such means must address all foreseeable failure modes and operating and maintenance errors. 2. The system must be designed so that its operation in-flight does not result in damage to the airplane or other aircraft, or injury to any person. Operation of the system must not be capable of compromising continued safe flight and landing of other aircraft and the airplane on which it is installed, either by direct damage, laser-reflective damage, or through distraction or incapacitation of crew. 3. Laser-safety information for maintaining or servicing the airplane must be prominently placarded on the airplane or laser-based missile-defense system at the location of the laser installation. 4. Instructions for continued airworthiness for installation, removal, and maintenance of the laser-based missile-defense system must contain warnings appropriate to the laser classification concerning the hazards associated with exposure to laser radiation. This includes instructions regarding potential hazards to personnel who are using optical magnification devices such as magnifying glasses or binoculars. 5. The airplane flight manual supplement (AFMS) must describe the intended functions of the installed laser systems, to include identifying the intended operations and phases of flight. The AFMS must state: Caution: The operation of the installed laser system could pose significant risk of injury to others while in proximity to other aircraft, airports, and populated areas. Federal Aviation Administration Issued in Kansas City, Missouri, on January 7, 2022. Patrick R. Mullen, Manager, Technical Innovation Policy Branch, Policy and Innovation Division, Aircraft Certification Service. Authority Citation The authority citation for these special conditions is as follows: 2563 [FR Doc. 2022–00505 Filed 1–14–22; 8:45 am] BILLING CODE 4910–13–P PO 00000 Frm 00005 Fmt 4702 Sfmt 4702 14 CFR Part 39 [Docket No. FAA–2021–1183; Project Identifier AD–2021–01193–E] RIN 2120–AA64 Airworthiness Directives; CFM International, S.A. Turbofan Engines Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: The FAA proposes to adopt a new airworthiness directive (AD) for all CFM International, S.A. (CFM) LEAP– 1A23, LEAP–1A24, LEAP–1A24E1, LEAP–1A26, LEAP–1A26CJ, LEAP– 1A26E1, LEAP–1A29, LEAP–1A29CJ, LEAP–1A30, LEAP–1A32, LEAP–1A33, LEAP–1A33B2, and LEAP–1A35A model turbofan engines. This proposed AD was prompted by the detection of melt-related freckles in the billet, which may reduce the life of certain compressor rotor stages 6–10 spools, high pressure turbine (HPT) rotor interstage seals, HPT rotor stage 2 disks, low pressure turbine (LPT) stage 1 disks, LPT stage 2 disks, LPT stage 3 disks, and LPT stage 4 disks. This proposed AD would require revising the airworthiness limitations section (ALS) of the applicable CFM LEAP–1A Engine Shop Manual (ESM) and the operator’s existing approved continuous airworthiness maintenance program (CAMP) to incorporate reduced life limits for these parts. This proposed AD would also require the removal of certain LPT stage 4 disks identified by serial number (S/N) prior to their new life limits. 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 March 4, 2022. 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 https://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. SUMMARY: E:\FR\FM\18JAP1.SGM 18JAP1 2564 Federal Register / Vol. 87, No. 11 / Tuesday, January 18, 2022 / Proposed Rules For service information identified in this NPRM, contact CFM International, S.A., Aviation Operations Center, 1 Neumann Way, M/D Room 285, Cincinnati, OH 45125; phone: (877) 432–3272; email: fleetsupport@ge.com. You may view this service information 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. khammond on DSKJM1Z7X2PROD with PROPOSALS Examining the AD Docket You may examine the AD docket at https://www.regulations.gov by searching for and locating Docket No. FAA–2021–1183; 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 received, and other information. The street address for Docket Operations is listed above. FOR FURTHER INFORMATION CONTACT: Mehdi Lamnyi, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: (781) 238–7743; fax: (781) 238– 7199; 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 ADDRESSES. Include ‘‘Docket No. FAA–2021–1183; Project Identifier AD– 2021–01193–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 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 https:// www.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 VerDate Sep<11>2014 16:30 Jan 14, 2022 Jkt 256001 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, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803. 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 the detection of meltrelated freckles in the billet, which may reduce the life of certain compressor rotor stages 6–10 spools, HPT rotor interstage seals, HPT rotor stage 2 disks, LPT stage 1 disks, LPT stage 2 disks, LPT stage 3 disks, and LPT stage 4 disks (life-limited parts (LLPs)). Through the manufacturer’s investigation, it was determined that these LLPs may have subsurface anomalies that developed during the manufacturing process, resulting in a lower life capability. As a result of its investigation, the manufacturer determined the need to reduce the life limits of these LLPs. To reflect these reduced life limits, the manufacturer revised the CFM ALS, Chapter 05 of CFM LEAP 1A ESM. Additionally, the manufacturer published service information that specifies procedures for the removal and replacement of these LLPs before reaching their new life limits. The FAA is proposing to require operators to update the ALS of the applicable CFM LEAP–1A ESM, with the reduced life limits for these LLPs. The FAA is also proposing to require operators to remove certain LPT stage 4 disks identified by S/N before reaching their new life limits. The LPT stage 4 disks, identified by S/N in Figure 1 to paragraph (g)(2) of this proposed AD, were discovered by the manufacturer after publication of the ALS updates. This condition, if not addressed, could result in uncontained debris release, damage to the engine, and damage to the airplane. FAA’s Determination The FAA is issuing this NPRM after determining that the unsafe condition described previously is likely to exist or PO 00000 Frm 00006 Fmt 4702 Sfmt 4702 develop on other products of the same type design. Related Service Information Under 1 CFR Part 51 The FAA reviewed CFM High Pressure Compressor Rotor Life Limits LEAP 1A–05–11–02–01A–0B1B–C, Issue 010–00, dated September 15, 2021 (CFM LEAP 1A–05–11–02–01A–0B1B– C); CFM High Pressure Turbine Rotor Life Limits LEAP 1A–05–11–03–01A– 0B1B–C, Issue 007–00, dated September 15, 2021 (CFM LEAP 1A–05–11–03– 01A–0B1B–C); and CFM Low Pressure Turbine Rotor Life Limits LEAP 1A–05– 11–04–01A–0B1B–C, Issue 009–00, dated June 1, 2021 (LEAP 1A–05–11– 04–01A–0B1B–C). CFM LEAP 1A–05– 11–02–01A–0B1B–C, CFM LEAP 1A– 05–11–03–01A–0B1B–C, and CFM LEAP 1A–05–11–04–01A–0B1B–C provide the new life limits for the LLPs. 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 ADDRESSES. Other Related Service Information The FAA reviewed CFM LEAP 1A– 05–11–02–01A–0B1B–C, Issue 009–00, dated July 26, 2021; and CFM LEAP 1A– 05–11–03–01A–0B1B–C, Issue 006–00, dated July 26, 2021. This service information provides the new life limits for the LLPs. The FAA also reviewed CFM Service Bulletin (SB) LEAP–1A–72–00–0413– 01A–930A–D, Issue 004–00, dated December 11, 2021 (CFM SB LEAP–1A– 72–00–0413–01A–930A–D). CFM SB LEAP–1A–72–00–0413–01A–930A–D specifies procedures for removing and replacing the LLPs, and provides new life limits for certain S/Ns of the LLPs. Proposed AD Requirements in This NPRM This proposed AD would require revising the ALS of the CFM LEAP–1A ESM, as applicable to each affected engine model, and the operator’s existing approved CAMP to incorporate reduced life limits for certain LLPs. This proposed AD also requires replacement of two LPT stage 4 disks. Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 256 engines installed on airplanes of U.S. registry. The FAA estimates that 256 engines installed on airplanes of U.S. registry would require revising the ALS of the CFM LEAP–1A ESM and the operator’s existing approved CAMP. The FAA estimates that zero airplanes of E:\FR\FM\18JAP1.SGM 18JAP1 2565 Federal Register / Vol. 87, No. 11 / Tuesday, January 18, 2022 / Proposed Rules U.S. registry would require replacement of the LPT stage 4 disk. The FAA estimates the following costs to comply with this proposed AD: ESTIMATED COSTS Action Labor cost Revise ALS of Engine Manual and the operator’s existing approved CAMP. 1 work-hour × $85 per hour = $85 ................. Cost per product Parts cost $0 $85 Cost on U.S. operators $21,760 The FAA estimates the following costs to replace the LPT stage 4 disk: ESTIMATED COSTS Action Labor cost Replace LPT Stage 4 disk .............................. 225 work-hours × $85 per hour = $19,125 .... 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. khammond on DSKJM1Z7X2PROD with PROPOSALS 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 VerDate Sep<11>2014 16:30 Jan 14, 2022 Jkt 256001 Parts cost $129,000 Cost per product Cost on U.S. operators $148,125 under the criteria of the Regulatory Flexibility Act. Section, and JASC Code 7250, Turbine Section. List of Subjects in 14 CFR Part 39 (e) Unsafe Condition 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 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– 2021–1183; Project Identifier AD–2021– 01193–E. (a) Comments Due Date The FAA must receive comments on this airworthiness directive (AD) by March 4, 2022. (b) Affected ADs None. (c) Applicability This AD applies to CFM International, S.A. (CFM) LEAP–1A23, LEAP–1A24, LEAP– 1A24E1, LEAP–1A26, LEAP–1A26CJ, LEAP– 1A26E1, LEAP–1A29, LEAP–1A29CJ, LEAP– 1A30, LEAP–1A32, LEAP–1A33, LEAP– 1A33B2, and LEAP–1A35A model turbofan engines. (d) Subject Joint Aircraft System Component (JASC) Code 7230, Turbine Engine Compressor PO 00000 Frm 00007 Fmt 4702 Sfmt 4702 $0 This AD was prompted by the detection of melt-related freckles in the billet, which may reduce the life of certain compressor rotor stages 6–10 spools, high pressure turbine (HPT) rotor interstage seals, HPT rotor stage 2 disks, low pressure turbine (LPT) stage 1 disks, LPT stage 2 disks, LPT stage 3 disks, and LPT stage 4 disks. The FAA is issuing this AD to prevent the failure of the highpressure compressor, HPT rotor, and LPT rotor. The unsafe condition, if not addressed, could result in release of uncontained debris, damage to the engine, and damage to the airplane. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Required Actions (1) Within 60 days after the effective date of this AD, revise the airworthiness limitations section (ALS) of the applicable CFM LEAP–1A Engine Shop Manual (the ESM) and the operator’s existing approved continuous airworthiness maintenance program (CAMP) by incorporating the following service information: (i) CFM High Pressure Compressor Rotor Life Limits LEAP 1A–05–11–02–01A–0B1B– C, Issue 010–00, dated September 15, 2021; and (ii) CFM High Pressure Turbine Rotor Life Limits LEAP 1A–05–11–03–01A–0B1B–C, Issue 007–00, dated September 15, 2021; and (iii) CFM Low Pressure Turbine Rotor Life Limits LEAP 1A–05–11–04–01A–0B1B–C, Issue 009–00, dated June 1, 2021. (2) Before the LPT stage 4 disk, P/N 362– 039–520–0, with serial numbers identified in Figure 1 to paragraph (g)(2) of this AD (Figure 1) accumulates the cycles in Figure 1, or within 100 cycles after the effective date of this AD, whichever occurs later, remove the affected LPT stage 4 disk from service and replace with a part eligible for installation. E:\FR\FM\18JAP1.SGM 18JAP1 2566 Federal Register / Vol. 87, No. 11 / Tuesday, January 18, 2022 / Proposed Rules Figure 1 to Paragraph (g)(2)-Life Limits for LPT Stage 4 Disks, PIN 362-039-520-0 LPT Stage 4 Disk Serial Number Life Limit for LEAP-1A23, 1A24, -1A24El, -1A26, 1A26El, -1A29, -1A30, -1A32, 1A33, -1A33B2, and -1A35A 2,500 cycles PC975638 Life Limit for LEAP-1A26CJ and-1A29CJ 1,400 cycles PC975635 (1) You may take credit for the action required by paragraph (g)(1)(i) of this AD if the following service information was incorporated into the ALS of the applicable ESM and the operator’s existing approved CAMP prior to the effective date of this AD: CFM High Pressure Compressor Rotor Life Limits LEAP 1A–05–11–02–01A–0B1B–C, Issue 009–00, dated July 26, 2021. (2) You may take credit for the action required by paragraph (g)(1)(ii) of this AD if the following service information was incorporated into the ALS of the applicable ESM and the operator’s existing approved CAMP prior to the effective date of this AD: CFM High Pressure Turbine Rotor Life Limits LEAP 1A–05–11–03–01A–0B1B–C, Issue 006–00, dated July 26, 2021. (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)(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 of the local flight standards district office/ certificate holding district office. khammond on DSKJM1Z7X2PROD with PROPOSALS (j) Related Information (1) For more information about this AD, contact Mehdi Lamnyi, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: (781) 238–7743; fax: (781) 238–7199; email: Mehdi.Lamnyi@faa.gov. (2) For service information identified in this AD, contact CFM International, S.A., Aviation Operations Center, 1 Neumann Way, M/D Room 285, Cincinnati, OH 45125; phone: (877) 432–3272; email: fleetsupport@ ge.com. You may view this referenced service information 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. VerDate Sep<11>2014 16:30 Jan 14, 2022 Jkt 256001 Issued on January 7, 2022. Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2022–00509 Filed 1–14–22; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 71 [Docket No. FAA–2021–1150; Airspace Docket No. 21–ASW–28] RIN 2120–AA66 Proposed Amendment of the Class E Airspace; Watonga, OK Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: This action proposes to amend the Class E airspace at Watonga, OK. The FAA is proposing this action due to an airspace review conducted as part of the decommissioning of the Kingfisher very high frequency (VHF) omnidirectional range (VOR) as part of the VOR Minimal Operational Network (MON) Program. The name and geographic coordinates of the airport would also be updated to coincide with the FAA’s aeronautical database. DATES: Comments must be received on or before March 4, 2022. ADDRESSES: Send comments on this proposal to the U.S. Department of Transportation, Docket Operations, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue SE, Washington, DC 20590; telephone (202) 366–9826, or (800) 647–5527. You must identify FAA Docket No. FAA–2021– 1150/Airspace Docket No. 21–ASW–28, at the beginning of your comments. You may also submit comments through the internet at https://www.regulations.gov. You may review the public docket containing the proposal, any comments SUMMARY: PO 00000 Frm 00008 Fmt 4702 Sfmt 4702 received, and any final disposition in person in the Dockets Office between 9:00 a.m. and 5:00 p.m., Monday through Friday, except federal holidays. FAA Order JO 7400.11F, Airspace Designations and Reporting Points, and subsequent amendments can be viewed online at https://www.faa.gov/air_ traffic/publications/. For further information, you can contact the Airspace Policy Group, Federal Aviation Administration, 800 Independence Avenue SW, Washington, DC 20591; telephone: (202) 267–8783. FAA Order JO 7400.11F is also available for inspection at the National Archives and Records Administration (NARA). For information on the availability of FAA Order JO 7400.11F at NARA, email: fr.inspection@nara.gov or go to https:// www.archives.gov/federal-register/cfr/ ibr-locations.html. FOR FURTHER INFORMATION CONTACT: Jeffrey Claypool, Federal Aviation Administration, Operations Support Group, Central Service Center, 10101 Hillwood Parkway, Fort Worth, TX 76177; telephone (817) 222–5711. SUPPLEMENTARY INFORMATION: Authority for This Rulemaking The FAA’s authority to issue rules regarding aviation safety is found in Title 49 of the United States Code. 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. This rulemaking is promulgated under the authority described in Subtitle VII, Part A, Subpart I, Section 40103. Under that section, the FAA is charged with prescribing regulations to assign the use of airspace necessary to ensure the safety of aircraft and the efficient use of airspace. This regulation is within the scope of that authority as it would amend the Class E airspace extending upward from 700 feet above the surface at Watonga Regional Airport, Watonga, OK, to support instrument flight rule operations at this airport. E:\FR\FM\18JAP1.SGM 18JAP1 EP18JA22.000</GPH> (h) Credit for Previous Actions

Agencies

[Federal Register Volume 87, Number 11 (Tuesday, January 18, 2022)]
[Proposed Rules]
[Pages 2563-2566]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2022-00509]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2021-1183; Project Identifier AD-2021-01193-E]
RIN 2120-AA64


Airworthiness Directives; CFM International, S.A. Turbofan 
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 all CFM International, S.A. (CFM) LEAP-1A23, LEAP-1A24, LEAP-
1A24E1, LEAP-1A26, LEAP-1A26CJ, LEAP-1A26E1, LEAP-1A29, LEAP-1A29CJ, 
LEAP-1A30, LEAP-1A32, LEAP-1A33, LEAP-1A33B2, and LEAP-1A35A model 
turbofan engines. This proposed AD was prompted by the detection of 
melt-related freckles in the billet, which may reduce the life of 
certain compressor rotor stages 6-10 spools, high pressure turbine 
(HPT) rotor interstage seals, HPT rotor stage 2 disks, low pressure 
turbine (LPT) stage 1 disks, LPT stage 2 disks, LPT stage 3 disks, and 
LPT stage 4 disks. This proposed AD would require revising the 
airworthiness limitations section (ALS) of the applicable CFM LEAP-1A 
Engine Shop Manual (ESM) and the operator's existing approved 
continuous airworthiness maintenance program (CAMP) to incorporate 
reduced life limits for these parts. This proposed AD would also 
require the removal of certain LPT stage 4 disks identified by serial 
number (S/N) prior to their new life limits. 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 March 4, 
2022.

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 https://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.

[[Page 2564]]

    For service information identified in this NPRM, contact CFM 
International, S.A., Aviation Operations Center, 1 Neumann Way, M/D 
Room 285, Cincinnati, OH 45125; phone: (877) 432-3272; email: 
[email protected]. You may view this service information 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.

Examining the AD Docket

    You may examine the AD docket at https://www.regulations.gov by 
searching for and locating Docket No. FAA-2021-1183; 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 
received, and other information. The street address for Docket 
Operations is listed above.

FOR FURTHER INFORMATION CONTACT: Mehdi Lamnyi, Aviation Safety 
Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; 
phone: (781) 238-7743; fax: (781) 238-7199; 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 ADDRESSES. Include ``Docket No. FAA-2021-1183; Project Identifier 
AD-2021-01193-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 
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 
https://www.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, ECO Branch, FAA, 1200 District 
Avenue, Burlington, MA 01803. 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 the detection of melt-
related freckles in the billet, which may reduce the life of certain 
compressor rotor stages 6-10 spools, HPT rotor interstage seals, HPT 
rotor stage 2 disks, LPT stage 1 disks, LPT stage 2 disks, LPT stage 3 
disks, and LPT stage 4 disks (life-limited parts (LLPs)). Through the 
manufacturer's investigation, it was determined that these LLPs may 
have subsurface anomalies that developed during the manufacturing 
process, resulting in a lower life capability. As a result of its 
investigation, the manufacturer determined the need to reduce the life 
limits of these LLPs. To reflect these reduced life limits, the 
manufacturer revised the CFM ALS, Chapter 05 of CFM LEAP 1A ESM. 
Additionally, the manufacturer published service information that 
specifies procedures for the removal and replacement of these LLPs 
before reaching their new life limits.
    The FAA is proposing to require operators to update the ALS of the 
applicable CFM LEAP-1A ESM, with the reduced life limits for these 
LLPs. The FAA is also proposing to require operators to remove certain 
LPT stage 4 disks identified by S/N before reaching their new life 
limits. The LPT stage 4 disks, identified by S/N in Figure 1 to 
paragraph (g)(2) of this proposed AD, were discovered by the 
manufacturer after publication of the ALS updates. This condition, if 
not addressed, could result in uncontained debris release, damage to 
the engine, and damage to the airplane.

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 Service Information Under 1 CFR Part 51

    The FAA reviewed CFM High Pressure Compressor Rotor Life Limits 
LEAP 1A-05-11-02-01A-0B1B-C, Issue 010-00, dated September 15, 2021 
(CFM LEAP 1A-05-11-02-01A-0B1B-C); CFM High Pressure Turbine Rotor Life 
Limits LEAP 1A-05-11-03-01A-0B1B-C, Issue 007-00, dated September 15, 
2021 (CFM LEAP 1A-05-11-03-01A-0B1B-C); and CFM Low Pressure Turbine 
Rotor Life Limits LEAP 1A-05-11-04-01A-0B1B-C, Issue 009-00, dated June 
1, 2021 (LEAP 1A-05-11-04-01A-0B1B-C). CFM LEAP 1A-05-11-02-01A-0B1B-C, 
CFM LEAP 1A-05-11-03-01A-0B1B-C, and CFM LEAP 1A-05-11-04-01A-0B1B-C 
provide the new life limits for the LLPs. 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 
ADDRESSES.

Other Related Service Information

    The FAA reviewed CFM LEAP 1A-05-11-02-01A-0B1B-C, Issue 009-00, 
dated July 26, 2021; and CFM LEAP 1A-05-11-03-01A-0B1B-C, Issue 006-00, 
dated July 26, 2021. This service information provides the new life 
limits for the LLPs.
    The FAA also reviewed CFM Service Bulletin (SB) LEAP-1A-72-00-0413-
01A-930A-D, Issue 004-00, dated December 11, 2021 (CFM SB LEAP-1A-72-
00-0413-01A-930A-D). CFM SB LEAP-1A-72-00-0413-01A-930A-D specifies 
procedures for removing and replacing the LLPs, and provides new life 
limits for certain S/Ns of the LLPs.

Proposed AD Requirements in This NPRM

    This proposed AD would require revising the ALS of the CFM LEAP-1A 
ESM, as applicable to each affected engine model, and the operator's 
existing approved CAMP to incorporate reduced life limits for certain 
LLPs. This proposed AD also requires replacement of two LPT stage 4 
disks.

Costs of Compliance

    The FAA estimates that this AD, if adopted as proposed, would 
affect 256 engines installed on airplanes of U.S. registry. The FAA 
estimates that 256 engines installed on airplanes of U.S. registry 
would require revising the ALS of the CFM LEAP-1A ESM and the 
operator's existing approved CAMP. The FAA estimates that zero 
airplanes of

[[Page 2565]]

U.S. registry would require replacement of the LPT stage 4 disk.
    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
----------------------------------------------------------------------------------------------------------------
Revise ALS of Engine Manual and the  1 work-hour x $85 per hour               $0             $85         $21,760
 operator's existing approved CAMP.   = $85.
----------------------------------------------------------------------------------------------------------------

    The FAA estimates the following costs to replace the LPT stage 4 
disk:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                     Cost per      Cost on U.S.
               Action                         Labor cost            Parts cost        product        operators
----------------------------------------------------------------------------------------------------------------
Replace LPT Stage 4 disk...........  225 work-hours x $85 per           $129,000        $148,125              $0
                                      hour = $19,125.
----------------------------------------------------------------------------------------------------------------

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-2021-1183; Project 
Identifier AD-2021-01193-E.

(a) Comments Due Date

    The FAA must receive comments on this airworthiness directive 
(AD) by March 4, 2022.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to CFM International, S.A. (CFM) LEAP-1A23, 
LEAP-1A24, LEAP-1A24E1, LEAP-1A26, LEAP-1A26CJ, LEAP-1A26E1, LEAP-
1A29, LEAP-1A29CJ, LEAP-1A30, LEAP-1A32, LEAP-1A33, LEAP-1A33B2, and 
LEAP-1A35A model turbofan engines.

(d) Subject

    Joint Aircraft System Component (JASC) Code 7230, Turbine Engine 
Compressor Section, and JASC Code 7250, Turbine Section.

(e) Unsafe Condition

    This AD was prompted by the detection of melt-related freckles 
in the billet, which may reduce the life of certain compressor rotor 
stages 6-10 spools, high pressure turbine (HPT) rotor interstage 
seals, HPT rotor stage 2 disks, low pressure turbine (LPT) stage 1 
disks, LPT stage 2 disks, LPT stage 3 disks, and LPT stage 4 disks. 
The FAA is issuing this AD to prevent the failure of the high-
pressure compressor, HPT rotor, and LPT rotor. The unsafe condition, 
if not addressed, could result in release of uncontained debris, 
damage to the engine, and damage to the airplane.

(f) Compliance

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

(g) Required Actions

    (1) Within 60 days after the effective date of this AD, revise 
the airworthiness limitations section (ALS) of the applicable CFM 
LEAP-1A Engine Shop Manual (the ESM) and the operator's existing 
approved continuous airworthiness maintenance program (CAMP) by 
incorporating the following service information:
    (i) CFM High Pressure Compressor Rotor Life Limits LEAP 1A-05-
11-02-01A-0B1B-C, Issue 010-00, dated September 15, 2021; and
    (ii) CFM High Pressure Turbine Rotor Life Limits LEAP 1A-05-11-
03-01A-0B1B-C, Issue 007-00, dated September 15, 2021; and
    (iii) CFM Low Pressure Turbine Rotor Life Limits LEAP 1A-05-11-
04-01A-0B1B-C, Issue 009-00, dated June 1, 2021.
    (2) Before the LPT stage 4 disk, P/N 362-039-520-0, with serial 
numbers identified in Figure 1 to paragraph (g)(2) of this AD 
(Figure 1) accumulates the cycles in Figure 1, or within 100 cycles 
after the effective date of this AD, whichever occurs later, remove 
the affected LPT stage 4 disk from service and replace with a part 
eligible for installation.

[[Page 2566]]

[GRAPHIC] [TIFF OMITTED] TP18JA22.000

(h) Credit for Previous Actions

    (1) You may take credit for the action required by paragraph 
(g)(1)(i) of this AD if the following service information was 
incorporated into the ALS of the applicable ESM and the operator's 
existing approved CAMP prior to the effective date of this AD: CFM 
High Pressure Compressor Rotor Life Limits LEAP 1A-05-11-02-01A-
0B1B-C, Issue 009-00, dated July 26, 2021.
    (2) You may take credit for the action required by paragraph 
(g)(1)(ii) of this AD if the following service information was 
incorporated into the ALS of the applicable ESM and the operator's 
existing approved CAMP prior to the effective date of this AD: CFM 
High Pressure Turbine Rotor Life Limits LEAP 1A-05-11-03-01A-0B1B-C, 
Issue 006-00, dated July 26, 2021.

(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)(1) of this AD. You may email your 
request 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.

(j) Related Information

    (1) For more information about this AD, contact Mehdi Lamnyi, 
Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, 
Burlington, MA 01803; phone: (781) 238-7743; fax: (781) 238-7199; 
email: [email protected].
    (2) For service information identified in this AD, contact CFM 
International, S.A., Aviation Operations Center, 1 Neumann Way, M/D 
Room 285, Cincinnati, OH 45125; phone: (877) 432-3272; email: 
[email protected]. You may view this referenced service 
information 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.

    Issued on January 7, 2022.
Lance T. Gant,
Director, Compliance & Airworthiness Division, Aircraft Certification 
Service.
[FR Doc. 2022-00509 Filed 1-14-22; 8:45 am]
BILLING CODE 4910-13-P
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