Federal Register / Vol. 89, No. 211 / Thursday, October 31, 2024 / Rules and Regulations 86721 

(h) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, West Certification 

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 West Certification 

Branch, send it to the attention of the person 

identified in paragraph (i) of this AD. 

Information may be emailed 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. 

(i) Related Information 

For more information about this AD, 

contact Johann Magana, Aviation Safety 

Engineer, FAA, 3960 Paramount Boulevard, 

Lakewood, CA 90712; phone: (562) 627– 

5322; email: johann.magana@faa.gov. 

(j) 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) DART Aerospace Operation 

Instructional Manual for General Pull Cable 

Rigging and Testing Procedure, Revision B, 

dated May 12, 2023. 

(ii) DART Aerospace Service Bulletin (SB) 

No. SB2020–09, Revision A, dated March 16, 

2021. 

(iii) DART Aerospace SB No. SB2021–01, 

Revision A, dated December 28, 2021. 

(iv) DART Aerospace SB No. SB2021–02, 

dated April 30, 2021. 

(v) DART Aerospace SB No. SB2021–03, 

dated June 30, 2021. 

(vi) DART Aerospace SB No. SB2022–01, 

dated March 14, 2022. 

(3) For material identified in this AD, 

contact Dart Aerospace, LTD., 1270 Aberdeen 

Street, Hawkesbury, ON, K6A 1K7, Canada; 

phone: 1–613–632–5200; fax: 1–613–632– 

5246; website: dartaero.com. 

(4) You may view this material at the FAA, 

Office of the Regional Counsel, Southwest 

Region, 10101 Hillwood Parkway, Room 6N– 

321, Fort Worth, TX 76177. 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 fr.inspection@nara.gov. 

Issued on October 28, 2024. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2024–25390 Filed 10–30–24; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2024–1695; Project 

Identifier AD–2023–00783–E; Amendment 

39–22869; AD 2024–21–02] 

RIN 2120–AA64 

Airworthiness Directives; Lycoming 

Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for 

Lycoming Engines (Lycoming) model 

engines that have a certain connecting 

rod assemblies installed. This AD was 

prompted by several reports of 

connecting rod failures, which resulted 

in uncontained engine failure and inflight shutdowns (IFSDs). This AD 

requires repetitive oil inspections for 

bronze metal particulates and, if found, 

additional inspections of the connecting 

rod bushings for damage, proper fit, 

movement, and wear, and replacement 

if necessary. As terminating action to 

the connecting rod bushing inspections, 

this AD requires replacement of the 

connecting rod bushings with parts 

eligible for installation. The FAA is 

issuing this AD to address the unsafe 

condition on these products. 

DATES: This AD is effective December 5, 

2024. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of December 5, 2024. 

ADDRESSES: 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2024–1695; 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. 

Material Incorporated by Reference: 

• For Lycoming material identified in 

this AD, contact Lycoming Engines, 652 

Oliver Street, Williamsport, PA 17701; 

phone: (800) 258–3279; website: 

lycoming.com/contact/knowledge-base/ 

publications. 

• 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. It is also available at 

regulations.gov under Docket No. FAA– 

2024–1695. 

FOR FURTHER INFORMATION CONTACT: 

James Delisio, Aviation Safety Engineer, 

FAA, 1701 Columbia Avenue, College 

Park, GA 30337; phone: (516) 228–7321; 

email: james.delisio@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 by adding an AD that would 

apply to Lycoming model engines that 

have certain connecting rod assemblies 

installed. The NPRM published in the 

Federal Register on June 28, 2024 (89 

FR 53911). The NPRM was prompted by 

several reports of connecting rod 

failures, which resulted in uncontained 

engine failure and IFSDs, and a 

manufacturer investigation where it was 

determined that affected connecting rod 

small end bushings may be installed on 

additional populations of Lycoming 

engines. The manufacturer also 

determined that degradation of the 

connecting rod small end bushings is 

detectable during oil change 

inspections. In the NPRM, the FAA 

proposed to require repetitive oil 

inspections for bronze metal 

particulates and, if found, additional 

inspections of the connecting rod 

bushings for damage (e.g. deterioration, 

missing metal), proper fit, movement, 

and wear, and replacement if necessary. 

As terminating action to the connecting 

rod bushing inspections, the NPRM also 

proposed to require replacement of the 

connecting rod bushings with parts 

eligible for installation. The FAA is 

issuing this AD to address the unsafe 

condition on these products. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received one comment from 

Aeroclub de Columbia. The following 

presents the comment received on the 

NPRM and the FAA’s response to the 

comment. 

Request To Clarify Scheduling of 

Inspections 

Aeroclub de Columbia requested that 

the FAA confirm whether the recurrent 

inspections required by paragraph (g) of 

the proposed AD should also be 

scheduled monthly for aircraft in 14 

CFR part 91 (non-commercial) 

operations. Aeroclub de Columbia noted 


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86722 Federal Register / Vol. 89, No. 211 / Thursday, October 31, 2024 / Rules and Regulations 

that Lycoming Service Bulletin 480F 

suggests changing the oil every 50 hours 

or every 4 months, but several aircraft 

maintenance manuals specify oil 

replacement every 50 hours without a 

calendar time restriction. 

To clarify, this AD does not define or 

mandate the frequency of oil changes 

after the initial oil change. Subsequent 

oil changes are part of the engine’s 

regular maintenance program, therefore 

the recurring frequency is outside the 

scope of this AD. Although repetitive 

inspections are required during this 

regular maintenance interval, they are 

tied to the operator’s oil change 

frequency and that frequency is not 

being defined by this AD. The FAA did 

not change this AD as a result of this 

comment. 

Conclusion 

The FAA reviewed the relevant data, 

considered any comments received, and 

determined that air safety requires 

adopting this AD as proposed. 

Accordingly, the FAA is issuing this AD 

to address the unsafe condition on these 

products. Except for minor editorial 

changes, and any other changes 

described previously, this AD is 

adopted as proposed in the NPRM. 

None of the changes will increase the 

economic burden on any operator. 

Material Incorporated by Reference 

Under 1 CFR Part 51 

The FAA reviewed Lycoming 

Mandatory Service Bulletin No. 630A, 

dated June 13, 2017, which specifies 

procedures for inspection of the 

connecting rod bushings for damage, 

proper fit, movement, and wear. 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. 

Costs of Compliance 

The FAA estimates that this AD 

affects 16,000 engines installed on 

airplanes of U.S. registry. 

The FAA estimates the following 

costs to comply with this AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

Inspect oil ............................................................ 2 work-hours × $85 per hour = $170 ................. $65 $235 $3,760,000 

Inspect connecting rod bushings ........................ 1 work-hour × $85 per hour = $85 ..................... 0 85 1,360,000 

Replace connecting rod bushings (per bushing) 4.5 work-hours × $85 per hour = $382 .............. 380 762 12,192,000 

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 

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 adding 

the following new airworthiness 

directive: 

2024–21–02 Lycoming Engines: 

Amendment 39–22869; Docket No. 

FAA–2024–1695; Project Identifier AD– 

2023–00783–E. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective December 5, 2024. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Lycoming Engines 

(Lycoming) model engines that have an 

affected part and part number (P/N) installed 

and are assembled within the ship date 

range, as specified in Table 1 to paragraph (c) 

of this AD. 

TABLE 1 TO PARAGRAPH (c)—AFFECTED P/NS

P/N Affected part Ship date range 

LW–13923 ....................................................................... Connecting Rod Bushing ............................................... 01/30/2009–11/17/2015 

LW–11750 ....................................................................... Connecting Rod Assembly ............................................. 01/30/2009–11/19/2015 

78030 .............................................................................. Connecting Rod Assembly ............................................. 01/30/2009–03/31/2016 

LW–19332 ....................................................................... Connecting Rod Assembly ............................................. 01/30/2009–01/03/2016 

LW–13865 ....................................................................... Connecting Rod Assembly ............................................. 01/30/2009–02/14/2017 


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Federal Register / Vol. 89, No. 211 / Thursday, October 31, 2024 / Rules and Regulations 86723 

TABLE 1 TO PARAGRAPH (c)—AFFECTED P/NS—Continued 

P/N Affected part Ship date range 

77450 .............................................................................. Connecting Rod Assembly ............................................. 01/30/2009–02/14/2017 

LW–13422 ....................................................................... Connecting Rod Assembly ............................................. 01/30/2009–02/14/2017 

LW–13937 ....................................................................... Connecting Rod Assembly ............................................. 01/30/2009–02/14/2017 

LW–15288 ....................................................................... Connecting Rod Assembly ............................................. 01/30/2009–02/14/2017 

Note 1 to paragraph (c): The affected parts 

are known to be installed on Lycoming 

Model AEIO–320 series, AEIO–360 series, 

AEIO–390 series, AEIO–540 series, AEIO– 

580–B1A, AIO–320 series, AIO–360 series, 

HIO–360 series, HIO–390–A1A, HIO–540– 

A1A, HO–360 series, IO–320 series, IO–360 

series, IO–390 series, IO–540 series, IVO– 

360–A1A, IVO–540–A1A, LHIO–360 series, 

LIO–320 series, LIO–360 series, LO–360 

series, LTIO–540 series, LTO–360 series, O– 

233–A1, O–235 series, O–320 series, O–340 

series, O–360 series, O–435 series, O–540 

series, SO–580 series, TEO–540 series, TIGO– 

541 series, TIO–360 series, TIO–540 series, 

TIO–541 series, TIVO–540–A2A, TO–360 

series, TVO–435 series, TVO–540–A1A, VO– 

360 series, VO–435 series, VO–540 series, 

and VSO–580–A1A engines. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 8500, Engine (Reciprocating). 

(e) Unsafe Condition 

This AD was prompted by several reports 

of connecting rod failures resulting in 

uncontained engine failure and in-flight 

shutdowns (IFSDs). The FAA is issuing this 

AD to prevent connecting rod failure. The 

unsafe condition, if not addressed, could 

result in engine failure, an IFSD, and loss of 

control of the aircraft. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

(1) At the next oil change or within 4 

months after the effective date of this AD, 

whichever occurs first, and thereafter at 

every oil change until the bushing 

replacement required by either paragraph 

(g)(3) or (4) of this AD is done, perform a 

visual inspection of the engine oil filter, oil 

pressure screen, and oil suction screen 

(depending on the engine configuration) for 

bronze metal particulates. The actions 

required by this paragraph may be performed 

by the owner/operator (pilot) holding at least 

a private pilot certificate and must be entered 

into the aircraft records showing compliance 

with this AD in accordance with 14 CFR 

43.9(a) and 91.417(a)(2)(v). The record must 

be maintained as required by 14 CFR 91.417, 

121.380, or 135.439. 

Note 2 to paragraph (g)(1): Guidance for 

engine oil filter, oil pressure screen, and oil 

suction screen inspection instructions and 

identification of metallic solids may be found 

in Lycoming Mandatory Service Bulletin No. 

(MSB) 480F, dated May 25, 2017 (Lycoming 

MSB 480F). 

(2) If, during any inspection required by 

paragraph (g)(1) of this AD, any bronze metal 

particulates are found and the source is 

identified as the connecting rod bushings, 

before further flight, inspect all affected 

connecting rod bushings for damage (e.g. 

deterioration, missing metal), proper fit, 

movement, and wear in accordance with 

‘‘Connecting Rod Bushing Inspection,’’ of 

Lycoming MSB 630A, dated June 13, 2017. 

Note 3 to paragraph (g)(2): Guidance for 

identifying the source of metallic 

contamination may be found in Table 3 of 

Lycoming MSB 480F. 

(3) If the connecting rod bushings fail any 

inspection required by paragraph (g)(2) of 

this AD, before further flight, replace the 

connecting rod bushings with parts eligible 

for installation. This terminates the repetitive 

inspection required by paragraph (g)(1) of 

this AD. 

(4) At the next engine overhaul, replace the 

connecting rod bushings with parts eligible 

for installation. This terminates the repetitive 

inspection required by paragraph (g)(1) of 

this AD. 

(h) Definition 

For the purpose of this AD, a ‘‘part eligible 

for installation’’ is any connecting rod 

bushing having P/N 01K28983. 

(i) Credit for Previous Actions 

You may take credit for the actions 

required by paragraph (g)(1) of this AD if you 

performed those actions before the effective 

date of this AD using Lycoming MSB 480F. 

(j) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, East Certification 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 

branch office, send it to the attention of the 

person identified in paragraph (k)(1) of this 

AD and email to: 9-avs-nyaco-cos@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) Additional Information 

(1) For more information about this AD, 

contact James Delisio, Aviation Safety 

Engineer, FAA, 1701 Columbia Avenue, 

College Park, GA 30337; phone: (516) 228– 

7321; email: james.delisio@faa.gov. 

(2) Service information identified in this 

AD that is not incorporated by reference is 

available at the address specified in 

paragraph (l)(3) of this AD. 

(l) 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) Lycoming Engines Mandatory Service 

Bulletin No. 630A, dated June 13, 2017. 

(ii) [Reserved] 

(3) For Lycoming Engines material 

identified in this AD, contact Lycoming 

Engines, 652 Oliver Street, Williamsport, PA 

17701; phone: (800) 258–3279; website: 

lycoming.com/contact/knowledge-base/ 

publications. 

(4) 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. 

(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 October 28, 2024. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2024–25365 Filed 10–30–24; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF HOMELAND 

SECURITY 

Coast Guard 

33 CFR Part 105 

[Docket No. USCG–2022–0052] 

RIN 1625–AC80 

TWIC—Reader Requirements; Second 

Delay of Effective Date 

AGENCY: Coast Guard, DHS. 

ACTION: Final rule. 

SUMMARY: The Coast Guard is further 

delaying the effective date for certain 

facilities affected by the final rule 

entitled ‘‘Transportation Worker 

Identification Credential (TWIC)— 

Reader Requirements,’’ published in the 


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