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Federal Register / Vol. 86, No. 36 / Thursday, February 25, 2021 / Rules and Regulations
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 helicopters 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.
Adoption of the Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:
PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

20210307 Leonardo S.p.a.: Amendment 3921410; Docket No. FAA20200649;
Product Identifier 2019SW061AD.
a Applicability This airworthiness directive AD applies to Leonardo S.p.a. Model AB139 and AW139
helicopters, certificated in any category, with an engine mounting rod part number P/N
3G7120V00132 with a serial number S/N

VerDate Sep<11>2014

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listed in Figures 2 or 3 of Leonardo Helicopters Alert Service Bulletin No. 139
593, Revision A, dated June 14, 2019 ASB
139593, installed.
b Unsafe Condition This AD defines the unsafe condition as a non-conforming engine mounting rod. This condition could result in structural failure of the engine mounting rod and subsequent loss of control of the helicopter.
c Effective Date This AD becomes effective April 1, 2021.
d Compliance You are responsible for performing each action required by this AD within the specified compliance time unless it has already been accomplished prior to that time.
e Required Actions 1 Before further flight, determine the total hours time-in-service TIS of each engine mounting rod.
2 Before reaching 225 total hours TIS or within 25 hours TIS, whichever occurs later, with the battery and any other electrical power supply disconnected, remove from service the engine mounting rod as follows:
i For the Number 1 engine outboard mounting rod, remove from service the Number 1 engine outboard mounting rod and install an airworthy Number 1 engine outboard mounting rod as shown in Detail B of Figure 1 of ASB 139593 and by following the Accomplishment Instructions, paragraphs 3.1 and 3.2 of ASB 139593, except you are not required to discard the Number 1 engine outboard mounting rod or comply with the Scrap Report instruction in paragraph 3.1 of ASB 139593.
Note 1 to paragraphs e2i through iv:
Figure 1 of ASB 139593 shows the engine outboard and inboard mounting rod assemblies for the left-hand side only, the right-hand side is symmetrical.
ii For the Number 1 engine inboard mounting rod, remove from service the Number 1 engine inboard mounting rod and install an airworthy Number 1 engine inboard mounting rod as shown in Detail C
of Figure 1 of ASB 139593 and by following the Accomplishment Instructions, paragraphs 3.3 and 3.4 of ASB 139593, except you are not required to discard the Number 1 engine inboard mounting rod or comply with the Scrap Report instruction in paragraph 3.3
of ASB 139593.
iii For the Number 2 engine outboard mounting rod, remove from service the Number 2 engine outboard mounting rod and install an airworthy Number 2 engine outboard mounting rod as shown in Detail B of Figure 1 of ASB 139593 and by following the Accomplishment instructions, paragraphs 4.1 and 4.2 of ASB 139593, except you are not required to discard the Number 2 engine outboard mounting rod or comply with the Scrap Report instruction in paragraph 4.1 of ASB 139593.
iv For the Number 2 engine inboard mounting rod, remove from service the Number 2 engine inboard mounting rod and install an airworthy Number 2 engine inboard mounting rod as shown in Detail C

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of Figure 1 of ASB 139593 and by following the Accomplishment instructions, paragraphs 4.3 and 4.4 of ASB 139593, except you are not required to discard the Number 2 engine inboard mounting rod or comply with the Scrap Report instruction in paragraph 4.3
of ASB 139593.
3 As of the effective date of this AD, do not install on any helicopter an engine mounting rod with a P/N and S/N listed in paragraph a of this AD.
f Credit for Previous Actions Actions accomplished before the effective date of this AD in accordance with the procedures specified in Leonardo Helicopters Alert Service Bulletin No. 139593, dated June 11, 2019, are considered acceptable for compliance with the corresponding actions specified in paragraphs e1 and 2 of this AD.
g Alternative Methods of Compliance AMOCs 1 The Manager, International Validation Branch, FAA, may approve AMOCs for this AD. Send your proposal to: Kristi Bradley, Aviation Safety Engineer, General Aviation &
Rotorcraft Section, International Validation Branch, FAA, 10101 Hillwood Pkwy., Fort Worth, TX 76177; telephone 8172225110;
email 9-AVS-AIR-730-AMOC@faa.gov.
2 For operations conducted under a 14
CFR part 119 operating certificate or under 14 CFR part 91, subpart K, the FAA suggests that you notify your principal inspector, or lacking a principal inspector, the manager of the local flight standards district office or certificate holding district office, before operating any aircraft complying with this AD through an AMOC.
h Additional Information 1 Leonardo Helicopters Alert Service Bulletin No. 139593, dated June 11, 2019, and Leonardo Helicopters AMP DM 39A
71210500A520AB, AMP DM 39A71
210500A720AB, AMP DM 39A7121
0600A520AB, AMP DM 39A712106
00A720AB, AMP DM 39A712107
00A520AB, AMP DM 39A712107
00A720AB, AMP DM 39A712108
00A520AB, and AMP DM 39A7121
0800A720AB, all dated October 4, 2019, which are not incorporated by reference, contain additional information about the subject of this AD. For service information identified in this AD, contact Leonardo S.p.a.
Helicopters, Emanuele Bufano, Head of Airworthiness, Viale G.Agusta 520, 21017
C.Costa di Samarate Va Italy; telephone +390331225074; fax +390331229046; or at https www.leonardocompany.com/en/
home. You may view a copy of the service information at the FAA, Office of the Regional Counsel, Southwest Region, 10101
Hillwood Pkwy., Room 6N321, Fort Worth, TX 76177.
2 The subject of this AD is addressed in European Union Aviation Safety Agency EASA AD No. 20190149, dated June 24, 2019. You may view the EASA AD on the internet at https www.regulations.gov in Docket No. FAA20200649.

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