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Federal Register / Vol. 86, No. 171 / Wednesday, September 8, 2021 / Rules and Regulations Costs of Compliance The FAA estimates that this AD
affects 114 helicopters of U.S. Registry.
Labor rates are estimated at $85 per work-hour. Based on these numbers, the FAA estimates the following costs to comply with this AD.
Tap inspecting an MRB tip cap takes 1 work-hour, for a cost per helicopter of $85 per inspection cycle for a total U.S.
fleet cost of $9,690 per inspection cycle.
Replacing 1 MRB, if required, takes 4
work-hours, and required parts cost $141,725, for a total cost of $142,065 per MRB.
The FAA has included all known costs in its cost estimate. According to the manufacturer, however, some of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected operators.
Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs 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 Agencys 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 helicopters identified in this rulemaking action.

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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.

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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 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:

20211715 Leonardo S.p.a.: Amendment 3921698; Docket No. FAA20210463;
Project Identifier 2018SW050AD.
a Effective Date This airworthiness directive AD is effective October 13, 2021.
b Affected ADs None.
c Applicability This AD applies to Leonardo S.p.a. Model AB139 and AW139 helicopters, certificated in any category, with a main rotor blade MRB that has less than 1,200 total hours time-in-service TIS and has part number 3G6210A00131 with any serial number listed in Table 1 of Leonardo Helicopters Alert Service Bulletin No. 139520, dated April 26, 2018 ASB 139520, installed.
d Subject Joint Aircraft Service Component JASC
Code: 6210, Main Rotor Blades.
e Unsafe Condition This AD was prompted by a report of disbonding of an MRB tip cap, which if not detected and corrected, could result in loss of the MRB tip cap, severe vibrations, and subsequent loss of control of the helicopter.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Required Actions 1 Within 50 hours TIS after the effective date of this AD, using a tap hammer or equivalent, tap inspect each MRB tip cap for disbonding in the area depicted in Figure 1
of ASB 139520.
i If there is no disbonding, tap inspect each MRB tip cap as required by paragraph g1 of this AD at intervals not to exceed 50
hours TIS.
ii If there is any disbonding that does not exceed the limits specified in Annex A, paragraphs 2.3 and 2.4 of ASB 139520, tap inspect the MRB tip cap as required by
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paragraph g1 of this AD at intervals not to exceed 10 hours TIS.
iii If there is any disbonding that exceeds the limits specified in Annex A, paragraphs 2.3 and 2.4 of ASB 139520, remove the MRB
from service before further flight.
2 Accumulation of 1,200 total hours TIS
on the affected part without findings of any disbonded area or with findings of any disbonded area that is within the permitted limits specified in Annex A, paragraphs 2.3
and 2.4 of ASB 139520, constitutes terminating action for the repetitive inspections required by paragraphs g1i and ii of this AD.
3 As of effective date of this AD, do not install any MRB that is identified in paragraph c of this AD on any helicopter.
h Alternative Methods of Compliance AMOCs 1 The Manager, International Validation 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 International Validation Branch, send it to the attention of the person identified in paragraph i1 of this AD.
Information may be emailed to: 9-AVS-AIR730-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 1 For more information about this AD, contact Bang Nguyen, Aerospace Engineer, Certification Section, Fort Worth ACO
Branch, Compliance & Airworthiness Division, FAA, 10101 Hillwood Pkwy., Fort Worth, TX 76177; telephone 817 2224973;
email bang.nguyen@faa.gov.
2 The subject of this AD is addressed in European Aviation Safety Agency now European Union Aviation Safety Agency EASA AD 20180130, dated June 18, 2018.
You may view the EASA AD at https
www.regulations.gov in Docket No. FAA
20210463.
j Material Incorporated by Reference 1 The Director of the Federal Register approved the incorporation by reference of the service information listed in this paragraph under 5 U.S.C. 552a and 1 CFR
part 51.
2 You must use this service information as applicable to do the actions required by this AD, unless the AD specifies otherwise.
i Leonardo Helicopters Alert Service Bulletin No. 139520, dated April 26, 2018.
ii Reserved 3 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 +390331
225074; fax +390331229046; or at https
customerportal.leonardocompany.com/enUS/.

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