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Federal Register / Vol. 86, No. 225 / Friday, November 26, 2021 / Rules and Regulations determined that air safety and the public interest require adopting this AD
as proposed, except for the change described previously, updating the service information for the optional replacement of the epicyclic reduction gear module in paragraphs g3 and 4
of this AD, and for clarity, deleting the corrective actions when there are no 16NCD13 particles. The FAA has determined that these changes will not increase the economic burden on any operator or increase the scope of this final rule.

assembly that has accumulated 1,800 or more total hours TIS installed, EASA
AD 20180263 requires replacing the MGB or epicyclic reduction gear within 600 flight hours after March 16, 2018, whereas this AD requires either of those replacements within 50 hours TIS after the effective date of this AD instead. If 16NCD13 particles are present, EASA
AD 20180263 requires taking a 1 liter sample of oil and returning it to Airbus Helicopters and removing the MGB for depot-level inspection, whereas this AD
requires replacing the MGB instead.

Related Service Information Under 1
CFR Part 51
The FAA reviewed Airbus Helicopters Alert Service Bulletin ASB No. EC155
05A034, Revision 5, dated December 4, 2018 ASB EC15505A34 Rev 5 for Model EC 155 helicopters, which specifies periodic inspections of the MGB magnetic plugs, the MGB filter, and the oil sump for particles. ASB
EC15505A34 Rev 5 also specifies identifying the type of gear assembly installed in the MGB and replacing any Type Y planet gear assembly within 50
hours TIS. For Type Z gear assemblies that have logged less than 1,800 hours TIS since new, this service information specifies replacing the gear assembly before exceeding 1,800 total hours TIS, and for Type Z gear assemblies that have logged 1,800 or more total hours TIS, replacing the gear assembly within 600 hours TIS.
The FAA also reviewed Airbus Helicopters Service Bulletin SB No.
EC15563016, Revision 5, dated March 6, 2019, for Model EC 155 helicopters.
This service information specifies procedures for replacing the MGB
epicyclic reduction gear without removing the MGB.
This service information 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 14 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.
Inspecting the magnetic plugs for particle deposits takes about 1 workhour for an estimated cost of $85 per helicopter per inspection cycle.
Inspecting the MGB filter or oil sump for particle deposits takes about 1 workhour for an estimated cost of $85 per helicopter per inspection cycle.
Replacing an MGB takes about 42
work-hours, and parts cost about $295,000 overhauled for an estimated total cost of $298,570 per helicopter.
Replacing the epicyclic reduction gear takes about 56 work-hours and parts cost about $11,404 for an estimated total cost of $16,164 per helicopter.

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Interim Action The FAA considers this AD to be an interim action. If final action is later identified, the FAA might consider further rulemaking then.
Differences Between This AD and EASA
AD 20180263
EASA AD 20180263 specifies compliance times based on flight hours and calendar dates. This AD sets compliance times based on hours TIS or before further flight. EASA AD 2018
0263 allows a pilot to inspect the MGB
magnetic plugs for particles, while this AD does not. For helicopters with at least one affected Type Z planet gear
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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.
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
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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 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:

20212216 Airbus Helicopters:
Amendment 3921789; Docket No.
FAA20210197; Project Identifier 2018SW107AD.
a Effective Date This airworthiness directive AD is effective January 3, 2022.
b Affected ADs None.
c Applicability This AD applies to Airbus Helicopters Model EC 155B and EC155B1 helicopters, certificated in any category.
d Subject Joint Aircraft Service Component JASC
Code: 6300, Main Rotor Drive System.
e Unsafe Condition This AD was prompted by the failure of a main gearbox MGB second stage planet gear. The FAA is issuing this AD to prevent failure of an MGB planet gear assembly. The unsafe condition, if not addressed, could result in failure of the MGB and subsequent loss of helicopter control.
f Compliance Comply with this AD within the compliance times specified, unless already done.

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