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Federal Register / Vol. 86, No. 104 / Wednesday, June 2, 2021 / Rules and Regulations
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FAA, 10101 Hillwood Pkwy., Fort Worth, TX 76177; telephone 817 222
5110; email Matthew.Fuller@faa.gov.
SUPPLEMENTARY INFORMATION:
Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 to supersede AD 20190707, Amendment 3919618 84 FR 16394, April 19, 2019 AD 20190707. AD
20190707 applied to Airbus Helicopters Model BO105A, BO105C, BO105S, BO105LS A3, MBBBK
117A1, MBBBK 117A3, MBBBK
117A4, MBBBK 117B1, MBBBK
117B2, MBBBK 117C1, MBBBK
117C2, and MBBBK 117D2
helicopters. The NPRM published in the Federal Register on March 10, 2021 86
FR 13665. The NPRM proposed to require, within 50 hours time-in-service, removing the affected bellows from the swashplate, cleaning and inspecting the support tube for scratches, and depending on the inspection results reworking the cylindrical area. The NPRM proposed to require inspecting the clamp for corrosion, damage, and incorrect installation, and depending on the inspection results, removing the clamp from service or reinstalling the clamp correctly and applying a torque.
The NPRM also proposed to require inspecting each ball bearing for corrosion, and depending on the inspection results, removing each ball bearing from service. The NPRM
proposed to require inspecting the deflection ring for foreign objects by removing the lockwire, screws, and the outer deflection ring and removing any foreign objects.
Additionally, the NPRM proposed to require, within 400 hours TIS, inspecting the swashplate for foreign objects and excessive bearing rolling friction. Finally, the NPRM proposed to prohibit installing a bellows P/N 105
10113.05, P/N 4619305044, P/N
4638305043, or P/N B623M20X2240, or a gearbox with a bellows P/N 105
10113.05, P/N 4619305044, or P/N
4638305043 on any helicopter.
EASA AD 20160142, dated July 19, 2016, which was revised to EASA AD
20160142R1, dated April 12, 2018, issued by EASA, which is the Technical Agent for the Member States of the European Union, to correct an unsafe condition for Model MBBBK117 A1, MBBBK117 A3, MBBBK117 A4, MBBBK117 B1, MBBBK117 B2, MBBBK117 C1, MBBBK117 C2, and MBBBK117 C2e helicopters, all serial numbers S/Ns, and Model BO105 A, BO105 C, BO105 D, BO105 S, and BO105 LS A3 helicopters, all variants, all S/Ns. EASA advises of
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several reports of a lower clamp found missing from the bellows and damaging the swashplate bearing ring before becoming detached. EASA states that an investigation showed that overtorqueing can damage the clamp, which may have caused the clamp to become loose and detach. EASA further advises that this condition, if not addressed, could result a detached clamp, which could damage the swashplate and pitch link or strike the tail rotor, resulting in loss of control of the helicopter.
Accordingly, EASA AD 20160142R1
requires removing the bellows, and performing modifications, inspections, and corrective actions in accordance with the applicable service information for your helicopter. EASA AD 2016
0142R1 also prohibits the installation of certain part-numbered bellows or any gearbox with certain part-numbered bellows on any helicopter.
Discussion of Final Airworthiness Directive Comments The FAA received no comments on the NPRM or the determination of the costs.
Conclusion These helicopters have been approved by EASA and are approved for operation in the United States. Pursuant to the FAAs bilateral agreement with the European Union, EASA has notified the FAA of the unsafe condition described in its AD. The FAA reviewed the relevant data and determined that air safety requires adopting this AD as proposed. Accordingly, the FAA is issuing this AD to address the unsafe condition on these helicopters.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Airbus Helicopters Alert Service Bulletin ASB ASB
BO10540A107 for Model BO105Cseries, D-series and S-series helicopters;
ASB BO105 LS40A12 for Model BO
105LS A3 helicopters; ASB MBB
BK11740A115 for Model MBBBK
117 A1, MBBBK 117 A3, MBBBK
117 A4, MBBBK 117 B1, MBBBK
117 B2, and MBBBK 117 C1
helicopters; and ASB MBBBK117
C262A007 for Model MBBBK 117
C2 helicopters, each Revision 5 and dated July 25, 2017. The FAA also reviewed Airbus Helicopters ASB MBB
BK117 D262A003, Revision 3, dated July 25, 2017, for Model MBBBK 117
D2 helicopters. This service information specifies removing the bellows and repetitively inspecting the swashplate.

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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.
Differences Between This AD and the EASA AD
The EASA AD requires compliance within different time intervals for some actions than what this AD requires. The EASA AD allows a non-cumulative tolerance of 10 percent that may be applied to the compliance times, and this AD does not. This AD applies to Model MBBBK 117D2 helicopters while the EASA AD does not. The EASA AD applies to Model BO105D
helicopters, while this AD does not. The EASA AD requires reporting corrosion to Airbus Helicopters while this AD
does not.
Costs of Compliance The FAA estimates that this AD
affects 211 helicopters of U.S. Registry.
Labor rates are estimated at $85 per work-hour. Based on these numbers, the FAA estimates that operators may incur the following costs in order to comply with this AD.
Inspecting the swashplate assembly takes about 3 work-hours for an estimated cost of $255 per helicopter and $53,805 for the U.S. fleet per inspection cycle.
Repairing a scratched support tube takes about 3 work-hours for an estimated cost of $255 per helicopter.
Replacing a corroded or damaged clamp takes about 2 work-hours and parts cost about $8 for a cost of $178 per helicopter.
Replacing corroded ball bearings takes about 4 work-hours and parts cost about $3,000 for a cost of $3,340 per helicopter.
Removing foreign objects from the outer deflection ring takes about 2 workhours for an estimated cost of $170 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
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