Voglio sapere a riguardo di…

38610

Federal Register / Vol. 86, No. 138 / Thursday, July 22, 2021 / Proposed Rules
lotter on DSK11XQN23PROD with PROPOSALS1

Proposed AD Requirements in This NPRM
This proposed AD would require for helicopters with at least one Type Y
planet gear assembly with a certain serial number S/N installed, or at least one Type Z planet gear assembly with a certain S/N installed, within 10 hours TIS after the effective date of this AD
and thereafter at intervals not to exceed 10 hours TIS, inspecting the MGB
magnetic plugs for particles. If there are particles, the proposed AD would require further inspections and analyses, and replacing the MGB, depending on the type and the size of the particles.
This proposed AD would also require for helicopters with a Type Y planet gear assembly with a certain S/N
installed, within 25 hours TIS after the effective date of this AD, inspecting the MGB filter for particles. If there are particles, this proposed AD would require further inspections and analyses, and replacing the MGB, depending on the type and the size of the particles. This proposed AD would require for helicopters with at least one Type Y planet gear assembly with a certain S/N installed, within 50 hours TIS after the effective date of this AD, replacing the MGB. As an alternative to replacing the MGB, this proposed AD
would allow replacing the epicyclic reduction gear in the affected MGB.
Additionally, this proposed AD
would require, for helicopters without any Type Y planet gear assembly but at least one Type Z planet gear assembly with a certain S/N installed, replacing the MGB within 50 hours TIS after the effective date of this AD or before any planet gear assembly accumulates 1,800
total hours TIS, whichever occurs later.
As an alternative to replacing the MGB, this proposed AD would allow replacing the epicyclic reduction gear in the affected MGB.
This proposed AD would require, for helicopters with at least one Type Z
planet gear with a certain S/N installed, within certain compliance times specified in the figures in this AD, inspecting the MGB filter and inspecting the oil sump for particles. If there are particles this proposed AD would require further inspections and analyses, and replacing the MGB, depending on the type and the size of the particles.
This proposed AD would prohibit installing an MGB with a certain serial numbered Type Y planet gear assembly and this proposed AD would also prohibit installing a Type Y planet gear assembly with a certain S/N on any helicopter.

VerDate Sep<11>2014

16:30 Jul 21, 2021

Jkt 253001

This proposed AD would also prohibit installing certain serial numbered Type Z planet gear assemblies that have accumulated 1,800
or more total hours TIS and prohibit installing an MGB with certain serial numbered Type Z planet gear assemblies that have accumulated 1,800
or more total hours TIS.
Finally, this proposed AD would prohibit installing an MGB if the type of the planet gear assembly cannot be determined and would also prohibit installing any planet gear assembly if the type cannot be determined.
Differences Between This Proposed AD
and the EASA AD
EASA AD 20180263 specifies compliance times based on flight hours and calendar dates. This proposed AD
would set compliance times based on hours TIS or before further flight. EASA
AD 20180263 allows a pilot to inspect the MGB magnetic plugs for particles, while this proposed AD would not. For helicopters with at least one affected Type Z planet gear 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 proposed AD would require either of those replacements within 50 hours TIS
after the effective date of this proposed 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 proposed AD
would require replacing the MGB
instead.
Interim Action The FAA considers this proposed AD
to be an interim action. If final action is later identified, the FAA might consider further rulemaking then.
Costs of Compliance The FAA estimates that this proposed AD would affect 14 helicopters of U.S.
Registry. The FAA estimates that operators may incur the following costs in order to comply with this proposed AD. Labor costs are estimated at $85 per work-hour.
Inspecting the magnetic plugs for particle deposits would take about 1
work-hour for an estimated cost of $85
per helicopter per inspection cycle.
Inspecting the MGB filter and oil sump for particle deposits would take about 1 work-hour for an estimated cost of $85 per helicopter per inspection cycle.

PO 00000

Frm 00021

Fmt 4702

Sfmt 4702

Replacing an MGB would take about 42 work-hours, and parts would cost about $295,000 overhauled for an estimated total cost of $298,570 per helicopter.
Replacing the epicyclic reduction gear would take about 56 work-hours and parts would cost about $11,404 for an estimated total cost of $16,164 per helicopter.
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 products identified in this rulemaking action.
Regulatory Findings The FAA determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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, I certify this proposed regulation:
1. Is not a significant regulatory action under Executive Order 12866, 2. Would not affect intrastate aviation in Alaska, and 3. Would 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 Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows:

E:FRFM22JYP1.SGM

22JYP1