2024-25365. Airworthiness Directives; Lycoming Engines

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
( print page 86723)
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