Federal Register / Vol. 86, No. 161 / Tuesday, August 24, 2021 / Rules and Regulations 47215 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2019–0597; Project 

Identifier 2019–NE–05–AD; Amendment 39– 

21670; AD 2021–16–08] 

RIN 2120–AA64 

Airworthiness Directives; CFM 

International, S.A. Turbofan Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is superseding 

Airworthiness Directive (AD) 2019–12– 

05 for certain CFM International S.A. 

(CFM) CFM56–5B, CFM56–5C, and 

CFM56–7B model turbofan engines with 

a certain rotating air high-pressure 

turbine (HPT) front seal. AD 2019–12– 

05 required replacement of the affected 

rotating air HPT front seal with a part 

eligible for installation. This AD was 

prompted by cracks found in the 

rotating air HPT front seal. This AD 

requires replacement of affected rotating 

air HPT front seals installed on CFM 

CFM56–5B, CFM56–5C, and CFM56–7B 

model turbofan engines that have fewer 

cycles since being reconfigured than the 

engines affected by AD 2019–12–05. 

This AD also requires CFM56–5B or 

CFM56–7B model turbofan engines with 

a reconfigured rotating air HPT front 

seal that was previously operated in a 

CFM56–5C model turbofan engine to 

follow the removal requirements for the 

CFM56–5C model turbofan engine. The 

FAA is issuing this AD to address the 

unsafe condition on these products. 

DATES: This AD is effective September 

28, 2021. 

ADDRESSES: For service information 

identified in this final rule, 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 (781) 238–7759. It is also available 

at https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2019–0597. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2019–0597; 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 

final rule, any comments received, and 

other information. The address for 

Docket Operations is U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE, 

Washington, DC 20590. 

FOR FURTHER INFORMATION CONTACT: 

Christopher McGuire, Aviation Safety 

Engineer, ECO Branch, FAA, 1200 

District Avenue, Burlington, MA 01803; 

phone: (781) 238–7120; fax: (781) 238– 

7199; email: Chris.McGuire@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 to supersede AD 2019–12–05, 

Amendment 39–19660 (84 FR 28717, 

June 20, 2019), (AD 2019–12–05). AD 

2019–12–05 applied to all CFM CFM56– 

5B, CFM56–5C, and CFM56–7B model 

turbofan engines with a certain rotating 

air HPT front seal. AD 2019–12–05 

required replacement of the affected 

rotating air HPT front seal with a part 

eligible for installation. The actions 

required by AD 2019–12–05 were 

interim and only addressed the highest 

risk engines with an affected rotating air 

HPT front seal that have a specified 

number of cycles since being 

reconfigured. 

The NPRM published in the Federal 

Register on October 23, 2019 (84 FR 

56709). AD 2019–12–05 was prompted 

by cracks found in the rotating air HPT 

front seal. In the NPRM, the FAA 

proposed to retain the requirements of 

AD 2019–12–05 and extend those 

requirements to engines that have fewer 

cycles since being reconfigured. 

After the NPRM was issued, CFM 

revised its service information that 

provides instructions for replacing the 

affected rotating air HPT front seal. In 

addition, the revised service 

information addresses CFM56–5B or 

CFM56–7B model turbofan engines with 

a reconfigured rotating air HPT front 

seal that was previously operated in a 

CFM56–5C model turbofan engine, and 

specifies that those engines follow the 

removal limits established for CFM56– 

5C model turbofan engines. In addition, 

the FAA determined changes to the 

proposed AD were necessary based on 

comments received on the NPRM. 

Accordingly, the FAA issued a 

supplemental notice of proposed 

rulemaking (SNPRM), which published 

in the Federal Register on March 23, 

2021 (86 FR 15436). In the SNPRM, the 

FAA proposed to retain the 

requirements of AD 2019–12–05 and 

expand the applicability to require the 

replacement of affected rotating air HPT 

front seals installed on CFM CFM56–5B, 

CFM56–5C, and CFM56–7B model 

turbofan engines that have fewer cycles 

since being reconfigured than the 

engines affected by AD 2019–12–05. In 

the SNPRM, the FAA also proposed to 

require that CFM56–5B and CFM56–7B 

model turbofan engines with a 

reconfigured rotating air HPT front seal 

that was previously operated in a 

CFM56–5C model turbofan engine 

follow the removal requirements of the 

CFM56–5C model turbofan engine. The 

FAA is issuing this AD to address the 

unsafe condition on these products. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received comments from 

one commenter on the SNPRM. The 

commenter was The Boeing Company 

(Boeing). Boeing supported the 

proposed AD without change. 

Conclusion 

The FAA reviewed the relevant data, 

considered the comments received, and 

determined that air safety requires 

adopting the AD as proposed. 

Accordingly, the FAA is issuing this AD 

to address the unsafe condition on these 

products. This AD is adopted as 

proposed in the SNPRM. 

Related Service Information 

The FAA reviewed CFM Service 

Bulletin (SB) CFM56–5B S/B 72–1074, 

Revision 02, dated November 6, 2019; 

CFM SB CFM56–5C S/B 72–0794, 

Revision 02, dated November 6, 2019; 

and CFM SB CFM56–7B S/B 72–1042, 

Revision 02, dated November 6, 2019. 

CFM SB CFM56–5B S/B 72–1074, 

Revision 02, contains procedures for 

replacing the affected rotating air HPT 

front seal on CFM CFM56–5B model 

turbofan engines. CFM SB CFM56–5C S/ 

B 72–0794, Revision 02, contains 

procedures for replacing the affected 

rotating air HPT front seal on CFM 

CFM56–5C model turbofan engines. 

CFM SB CFM56–7B S/B 72–1042, 

Revision 02, contains procedures for 

replacing the affected rotating air HPT 

front seal on CFM CFM56–7B model 

turbofan engines. 

Costs of Compliance 

The FAA estimates that this AD 

affects 4 engines installed on airplanes 

of U.S. registry. 

The FAA estimates the following 

costs to comply with this AD: 


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47216 Federal Register / Vol. 86, No. 161 / Tuesday, August 24, 2021 / Rules and Regulations 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

Replace the rotating air HPT front seal .......... 1 work-hour × $85 per hour = $85 ................. $344,600 $344,685 $1,378,740 

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 has determined that this AD 

will not have federalism implications 

under Executive Order 13132. This AD 

will not have a substantial direct effect 

on the States, on the relationship 

between the national government and 

the States, or on the distribution of 

power and responsibilities among the 

various levels of government. 

For the reasons discussed above, I 

certify that this AD: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

(2) Will not affect intrastate aviation 

in Alaska, and 

(3) 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 Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA amends 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: 

■ a. Removing Airworthiness Directive 

2019–12–05, Amendment 39–19660 (84 

FR 28717, June 20, 2019); and 

■ b. Adding the following new 

airworthiness directive: 

2021–16–08 CFM International, S.A.: 

Amendment 39–21670; Docket No. 

FAA–2019–0597; Project Identifier 

2019–NE–05–AD. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective September 28, 2021. 

(b) Affected ADs 

This AD replaces AD 2019–12–05, 

Amendment 39–19660 (84 FR 28717, June 

20, 2019). 

(c) Applicability 

This AD applies to: 

(1) CFM International, S.A. (CFM) CFM56– 

5B1, –5B2, –5B4, –5B5, –5B6, –5B7, –5B1/P, 

–5B2/P, –5B3/P, –5B4/P, –5B5/P, –5B6/P, 

–5B7/P, –5B8/P, –5B9/P, –5B3/P1, –5B4/P1, 

–5B1/2P, –5B2/2P, –5B3/2P, –5B4/2P, –5B6/ 

2P, –5B9/2P, –5B3/2P1, –5B4/2P1, –7B20, 

–7B22, –7B24, –7B26, –7B27, –7B22/B1, 

–7B24/B1, –7B26/B1, –7B26/B2, –7B27/B1, 

–7B27/B3, –7B20/2, –7B22/2, –7B24/2, 

–7B26/2, –7B27/2, –7B27A model turbofan 

engines with a: 

(i) Rotating air high-pressure turbine (HPT) 

front seal: 

(A) With part number (P/N) 1795M36P01 

or P/N 1795M36P02 and serial numbers (S/ 

Ns) GWNDN949 through GWNSE969 or S/Ns 

GWN000CE through GWN0990L, not 

including S/Ns GWN08ND7, GWN0923A, 

GWN0971E, GWN098A1, GWN098W6, 

GWN098W8, GWN098WA, and GWN0990G, 

installed, and 

(B) That has been removed from the 

original HPT disk and re-assembled to a 

different HPT disk. 

(ii) [Reserved] 

(2) CFM CFM56–5C2, –5C2/4, –5C2/F, 

–5C2/F4, –5C2/G, –5C2/G4, –5C2/P, –5C3/F, 

–5C3/F4, –5C3/G, –5C3/G4, –5C3/P, –5C4, 

–5C4/1, –5C4/P, –5C4/1P model turbofan 

engines with a: 

(i) Rotating air HPT front seal: 

(A) With P/N 1795M36P01 or P/N 

1795M36P02 and S/Ns GWNDN949 through 

GWNSE969 or S/Ns GWN000CE through 

GWN0990L, not including S/Ns GWN08ND7, 

GWN0923A, GWN0971E, GWN098A1, 

GWN098W6, GWN098W8, GWN098WA, and 

GWN0990G, installed, and 

(B) That has been removed from the 

original HPT disk and re-assembled to a 

different HPT disk. 

(ii) [Reserved] 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 7250, Turbine Section. 

(e) Unsafe Condition 

This AD was prompted by cracks found in 

the rotating air HPT front seal. The FAA is 

issuing this AD to prevent failure of the 

rotating air HPT front seal. The unsafe 

condition, if not addressed, could result in 

the uncontained release of the rotating air 

HPT front seal, 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) For all affected CFM CFM56–5B and 

CFM56–7B model turbofan engines: 

(i) If, on July 5, 2019 (the effective date of 

AD 2019–12–05), the rotating air HPT front 

seal has 7,000 cycles or greater since being 

reconfigured, remove the part from service 

within 50 cycles after July 5, 2019 (the 

effective date of AD 2019–12–05), or before 

further flight, whichever occurs later, and 

replace with a part eligible for installation. 

(ii) If, on July 5, 2019 (the effective date of 

AD 2019–12–05), the rotating air HPT front 

seal has between 6,001 and 6,999 cycles, 

inclusive, since being reconfigured, remove 

the part from service within 500 cycles after 

July 5, 2019 (the effective date of AD 2019– 

12–05), but not to exceed 7,050 cycles since 

being reconfigured, or before further flight, 

whichever occurs later, and replace with a 

part eligible for installation. 

(iii) For all remaining CFM56–5B and 

CFM56–7B model turbofan engines, remove 

the rotating air HPT front seal from service 

before accumulating 6,500 cycles since being 

reconfigured, or within 50 cycles after the 

effective date of this AD, whichever occurs 

later. 

(2) For all affected CFM CFM56–5C model 

turbofan engines: 

(i) If, on July 5, 2019 (the effective date of 

AD 2019–12–05), the rotating air HPT front 

seal has 4,250 cycles or greater since being 

reconfigured, remove the part from service 

within 25 cycles after July 5, 2019 (the 

effective date of AD 2019–12–05), within 

1,500 cycles since the last fluorescent 

penetrant inspection (FPI) of the rotating air 

HPT front seal, or before further flight after 

the effective date of this AD, whichever 

occurs later, and replace with a part eligible 

for installation. 


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Federal Register / Vol. 86, No. 161 / Tuesday, August 24, 2021 / Rules and Regulations 47217 

(ii) If, on July 5, 2019 (the effective date of 

AD 2019–12–05), the rotating air HPT front 

seal has between 3,751 and 4,249 cycles, 

inclusive, since being reconfigured, remove 

the part from service within 250 cycles after 

July 5, 2019 (the effective date of AD 2019– 

12–05), before accumulating 4,275 cycles 

since being reconfigured, within 1,500 cycles 

since the last FPI of the rotating air HPT front 

seal, or before further flight after the effective 

date of this AD, whichever occurs later, and 

replace with a part eligible for installation. 

(iii) For all remaining CFM CFM56–5C 

model turbofan engines, remove the rotating 

air HPT front seal from service before 

accumulating 4,000 cycles since being 

reconfigured, or within 50 cycles after the 

effective date of this AD, whichever occurs 

later. 

(3) For CFM56–5B or CFM56–7B model 

turbofan engines with an affected rotating air 

HPT front seal that has been operated in a 

CFM56–5C model turbofan engine since 

being reconfigured, remove the rotating air 

HPT front seal from service using the cycle 

limits in paragraph (g)(2) of this AD. 

(h) Definition 

For the purpose of this AD, ‘‘reconfigured’’ 

occurs when a rotating air HPT front seal has 

been removed from the original HPT disk and 

re-assembled to a different HPT disk. 

(i) Installation Prohibition 

After the effective date of this AD, do not 

assemble any rotating air HPT front seal with 

greater than 0 cycles since new, having a 

S/N listed in paragraph (c) of this AD onto 

a HPT disk unless it is the same S/N HPT 

disk on which it has previously been 

assembled. 

(j) 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 Related Information. 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. 

(k) Related Information 

For more information about this AD, 

contact Christopher McGuire, Aviation Safety 

Engineer, ECO Branch, FAA, 1200 District 

Avenue, Burlington, MA 01803; phone: (781) 

238–7120; fax: (781) 238–7199; email: 

Chris.McGuire@faa.gov. 

(l) Material Incorporated by Reference 

None. 

Issued on July 29, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–18165 Filed 8–23–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF HOMELAND 

SAFETY 

Coast Guard 

33 CFR Part 165 

[Docket Number USCG–2021–0656] 

RIN 1625–AA00 

Safety Zone; Solo Swim, Rhode Island 

Sound, Block Island, RI 

AGENCY: Coast Guard, DHS. 

ACTION: Temporary final rule. 

SUMMARY: The Coast Guard is 

establishing a temporary safety zone on 

the navigable waters of Rhode Island 

Sound within 500 yards of the swimmer 

crossing the channel from Block Island, 

Rhode Island to East Matunuck, Rhode 

Island. This safety zone is needed to 

protect the swimmer, event sponsors’ 

safety vessels, and others in the 

maritime community from the safety 

hazards that may arise during his event. 

When enforced, entry of vessels or 

persons into this zone is prohibited 

unless specifically authorized by the 

Captain of the Port Sector Southeastern 

New England or a designated 

representative. 

DATES: This rule is effective from 6 a.m. 

on August 23, 2021, through 2 p.m. on 

August 25, 2021. But it will only be 

subject to enforcement from 6 a.m. to 2 

p.m. on one of these dates. 

ADDRESSES: To view documents 

mentioned in this preamble as being 

available in the docket, go to http://

www.regulations.gov, type USCG–2021– 

0656 in the ‘‘SEARCH’’ box and click 

‘‘SEARCH.’’ Click on Open Docket 

Folder on the line associated with this 

rule. 

FOR FURTHER INFORMATION CONTACT: If 

you have questions on this rule, call or 

email Petty Officer Joshua Herriott, 

Sector Southeastern New England, U.S. 

Coast Guard; telephone (401) 435–2342, 

email SENEWWM@uscg.mil. 

SUPPLEMENTARY INFORMATION: 

I. Table of Abbreviations 

CFR Code of Federal Regulations 

COTP Captain of the Port Sector 

Southeastern New England 

DHS Department of Homeland Safety 

FR Federal Register 

NPRM Notice of Proposed Rulemaking 

§ Section 

U.S.C. United States Code 

II. Background Information and 

Regulatory History 

The Coast Guard is issuing this 

temporary rule without prior notice and 

opportunity to comment pursuant to 

authority under section 4(a) of the 

Administrative Procedure Act (APA) (5 

U.S.C. 553(b)). This provision 

authorizes an agency to issue a rule 

without prior notice and opportunity to 

comment when the agency for good 

cause finds that those procedures are 

impracticable. Under 5 U.S.C. 553(b)(B), 

the Coast Guard finds that good cause 

exists for not publishing a notice of 

proposed rulemaking (NPRM) with 

respect to this rule because publishing 

an NPRM would be impracticable and 

contrary to the public interest. The 

Coast Guard was notified of the swim 

event from Block Island, Rhode Island 

to East Matunuck, Rhode Island without 

ample time to allow for a reasonable 

comment period and consider those 

comments before issuing the rule. The 

safety zone must be established by 

August 23, 2021, to protect the 

swimmer, as well as spectators and 

areas in the area during the ‘‘Solo 

Swim’’ event. 

Under 5 U.S.C. 553(d)(3), the Coast 

Guard finds that good cause exists for 

making this rule effective less than 30 

days after publication in the Federal 

Register. Delaying the effective date of 

this rule would be impracticable 

because action is needed to protect the 

swimmer and ensure the safety in the 

navigable waters within the safety zone 

during the ‘‘Solo Swim’’ event. 

III. Legal Authority and Need for Rule 

The Coast Guard is issuing this rule 

under authority in 46 U.S.C. 70034 

(previously 33 U.S.C. 1231). The 

Captain of the Port Sector Southeastern 

New England (COTP) has determined 

that potential hazards exist while the 

swimmer is crossing the recommended 

vessel route. This rule is needed to 

protect personnel, vessels, and the 

marine environment in the navigable 

waters within the safety zone. 

IV. Discussion of the Rule 

The Coast Guard is establishing a 

temporary safety zone in Rhode Island 

Sound for all navigable waters within 

500 yards of the swimmer crossing the 

recommended vessel route at 

approximately 41–17.5N, 71–32.0W, 

during his participation in the ‘‘Solo 

Swim’’ from Block Island, Rhode Island 

to East Matunuck, Rhode Island. No 

vessel or person will be permitted to 


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