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Federal Register / Vol. 86, No. 45 / Wednesday, March 10, 2021 / Proposed Rules
numbered bellows and gearboxes with certain part-numbered bellows.
AD 20190707 was prompted by EASA AD No. 20160142, dated July 19, 2016, which was revised to EASA AD
No. 20160142R1, dated April 12, 2018, issued by EASA, which is the Technical Agent for the Member States of the European Union. EASA advises of several reports of a lower clamp found missing from the bellows and damaging the swashplate bearing ring before becoming detached. EASA states an investigation showed that overtorqueing can damage the clamp, which may have caused the clamp to become loose and detach. According to EASA, this condition, if not detected and corrected, could lead to loss of a swashplate clamp, and a detached clamp could damage the swashplate and pitch link or strike the tail rotor, resulting in loss of control of the helicopter.
Actions Since AD 20190707 Was Issued Since the FAA issued AD 201907
07, it was identified that bellows part number P/N B623M20X220 was inadvertently omitted from the prohibition in the Required Actions paragraph. It was also identified that Airbus Helicopters updated its service information by issuing several alert service bulletins which specified removing the bellows and repetitively inspecting the swashplate. Accordingly, this proposed AD would update the service information and any incorporated by reference information, add to the inspection requirements of AD 20190707, and prohibit installation of bellows P/N
B623M20X220.
FAAs Determination 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 about the unsafe condition described in its AD. The FAA is proposing this AD after evaluating all known relevant information and determining that an unsafe condition is likely to exist or develop on other helicopters of the same type designs.
Differences Between This Proposed AD
and the EASA AD
The EASA AD requires compliance within different time intervals for some actions than what this proposed AD
would require. The EASA AD allows a non-cumulative tolerance of 10 percent that may be applied to the compliance times, and this proposed AD would not.

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This proposed AD would apply to Model MBBBK 117D2 helicopters while the EASA AD does not. The EASA AD applies to Model BO105D
helicopters, while this proposed AD
would not. The EASA AD requires reporting corrosion to Airbus Helicopters while this proposed AD
would not.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Airbus Helicopters Alert Service Bulletin ASB BO105
40A107 for Model BO105C-series, Dseries and S-series helicopters; ASB
BO105 LS40A12 for Model BO105LS
A3 helicopters; ASB MBBBK117
40A115 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 MBBBK117 D2
62A003, Revision 3, dated July 25, 2017, for Model MBBBK 117 D2
helicopters. This service information specifies removing the bellows and repetitively inspecting the swashplate.
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.
Proposed AD Requirements This proposed AD would require the following within 50 hours hours timein-service TIS:
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;
Inspecting the clamp for corrosion, damage and incorrect installation, and, depending on the inspection results, removing the clamp from service, reinstalling the clamp correctly and applying a torque;
Inspecting each ball bearing for corrosion, and depending on the inspection results, removing each ball bearing from service; and Inspecting the deflection ring for foreign objects by removing the lockwire, screws, and the outer deflection ring and removing any foreign objects;
The proposed AD would also require, within 400 hours TIS, inspecting the swashplate for foreign objects and excessive bearing rolling friction.
Finally, this proposed AD would prohibit installing a bellows P/N 105
10113.05, P/N 4619305044, P/N

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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.
Costs of Compliance The FAA estimates that this proposed AD would affect 211 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 swashplate assembly would take 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 would take about 3 work-hours for an estimated cost of $255 per helicopter.
Replacing a corroded or damaged clamp would take about 2 work-hours and parts would cost about $8 for a cost of $178 per helicopter.
Replacing corroded ball bearings would take about 4 work-hours and parts would cost about $3,000 for a cost of $3,340 per helicopter.
Removing foreign objects from the outer deflection ring would take about 2 work-hours 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 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
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