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Federal Register / Vol. 86, No. 40 / Wednesday, March 3, 2021 / Proposed Rules supporting data. The FAA will consider all comments received by the closing date and may amend this proposal because of those comments.
Except for Confidential Business Information CBI as described in the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to https
www.regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this NPRM.

failure of an affected Ti-bolt installed in a critical location, possibly resulting in reduced control of the helicopter.
Accordingly, the EASA AD requires a one-time inspection for Ti-bolt part number P/N EN3740060022F marked with manufacturer monogram D or with an illegible manufacturer monogram installed on the aft connection of the tail rotor ball bearing control ball bearing control and, depending on findings, contacting AHD
for corrective action. The EASA AD also prohibits the reinstallation of these Tibolts.

Confidential Business Information CBI is commercial or financial information that is both customarily and actually treated as private by its owner.
Under the Freedom of Information Act FOIA 5 U.S.C. 552, CBI is exempt from public disclosure. If your comments responsive to this NPRM
contain commercial or financial information that is customarily treated as private, that you actually treat as private, and that is relevant or responsive to this NPRM, it is important that you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI
as PROPIN. The FAA will treat such marked submissions as confidential under the FOIA, and they will not be placed in the public docket of this NPRM. Submissions containing CBI
should be sent to Matt Fuller, AD
Program Manager, General Aviation &
Rotorcraft Unit, Airworthiness Products Section, Operational Safety Branch, FAA, 10101 Hillwood Pkwy., Fort Worth, TX 76177; telephone 817 222
5110; email matthew.fuller@faa.gov.
Any commentary that the FAA receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.

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 design.

Background EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD No. 2019
0258, dated October 18, 2019, to correct an unsafe condition for Airbus Helicopters Deutschland GmbH AHD, formerly Eurocopter Deutschland GmbH, Model MBBBK117 D2
helicopters. EASA advises of a report of a broken Ti-bolt. Subsequent investigation revealed that an improper heat treatment process was accomplished on a batch of Ti-bolts, which can lead to hydrogen embrittlement. Hydrogen embrittlement can make high-strength bolts susceptible to stress corrosion, pitting, and failure.
EASA states that this condition, if not detected and corrected, could lead to
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Related Service Information Under 1
CFR Part 51
The FAA reviewed Airbus Helicopters Alert Service Bulletin ASB No. ASB
MBBBK117 D200A001, Revision 1, dated October 16, 2019 ASB MBB
BK117 D200A001 Rev 1, which specifies replacing each Ti-bolt P/N
EN3740060022F that is marked with manufacturer monogram D or if the manufacturer monogram cannot be identified with an airworthy Ti-bolt in both locations of the aft connection of ball bearing control and both HF
antenna bracket locations.
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 removing any Ti-bolt P/N EN3740
060022F marked with manufacturer monogram D or with an illegible manufacturer monogram installed on the aft connection of the ball bearing control from service. This proposed AD
would also prohibit installing an affected Ti-bolt on the aft connection of the ball bearing control of any helicopter.
Differences Between This Proposed AD
and the EASA AD
The EASA AD applies to Model MBBBK117 D2 helicopters and requires inspecting for Ti-bolt P/N

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EN3740060022F marked with manufacturer monogram D or with an illegible manufacturer monogram installed on the aft connection of the ball bearing control. This proposed AD
applies to Model MBBBK 117 D2
helicopters with a Ti-bolt P/N EN3740
060022F marked with manufacturer monogram D or with an illegible manufacturer monogram installed on the aft connection of the ball bearing control instead. The EASA AD requires contacting AHD for approved instructions if an affected Ti-bolt is found, whereas this proposed AD would require removing an affected Ti-bolt from service instead.
Costs of Compliance The FAA estimates that this AD if adopted as proposed, would affect 29
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 proposed AD.
Replacing a Ti-bolt would take about 2 work-hours and parts would cost about $100 for an estimated cost of $270
per Ti-bolt.
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.

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