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Federal Register / Vol. 86, No. 198 / Monday, October 18, 2021 / Rules and Regulations Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210575; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this final rule, the Transport Canada AD, any comments received, and other information. The street address for Docket Operations is U.S. Department of Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Andrea Jimenez, Aerospace Engineer, COS Program Management Section, Operational Safety Branch, Compliance & Airworthiness Division, FAA, 1600
Stewart Ave., Suite 410, Westbury, NY
11590; telephone 516 2287330; email andrea.jimenez@faa.gov.
SUPPLEMENTARY INFORMATION:

inspection to determine if a spherical bearing is properly staked in the directional control bellcrank assembly, and, depending on the findings, replacement of the spherical bearing with a new spherical bearing, repair of an affected bellcrank assembly and repetitive inspections of that repaired bellcrank assembly, or replacement of the affected bellcrank assembly with a serviceable part. Transport Canada AD
CF202011 also provides terminating actions for the requirements of that AD.

Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to certain Bell Textron Canada Limited type certificate previously held by Bell Helicopter Textron Canada Limited Model 429 helicopters. The NPRM published in the Federal Register on July 23, 2021 86 FR 38946.
In the NPRM, the FAA proposed to require a one-time inspection of the lower surface of the spherical bearing in the directional control bellcrank assembly to determine if it is properly staked and, depending on the findings, applicable corrective actions. In the NPRM, the FAA also proposed to require, for certain helicopters, repetitive inspections and, depending on the findings, applicable corrective actions. The NPRM was prompted by Transport Canada AD CF202011, dated April 16, 2020 Transport Canada AD CF202011, issued by Transport Canada, which is the aviation authority for Canada, to correct an unsafe condition for Bell Textron Canada Limited Bell Model 429 helicopters, serial numbers 57001 through 57210, 57212 through 57344, 57346 through 57371, 57374 through 57377, and 57380.
Transport Canada advises that there are reports of incorrectly staked spherical bearings in the directional control bellcrank assembly. This condition, if not addressed, could result in wear or elongation of the bore in the bellcrank, which could result in reduced helicopter directional control.
Accordingly, Transport Canada AD
CF202011 requires a one-time
Air Methods requested that Bell Alert Service Bulletin 4291950, Revision B, dated December 19, 2019 Bell Alert Service Bulletin 4291950, Revision B
be included in the Credit for Previous Actions paragraph of the proposed AD.
The commenter stated that Revision B of the service bulletin was released on December 19, 2019.
The FAA infers that the commenter mentioned the date of Revision B of the service bulletin to show that it was released prior to the effective date of the final rule. The FAA acknowledges the commenters request and agrees to provide clarification. The requirements of paragraphs g and h of this AD refer to Bell Alert Service Bulletin 42919
50, Revision B, as the appropriate source of information for doing the actions required by those paragraphs.
Paragraph f, Compliance, of this AD
states comply with this AD within the compliance times specified, unless already done. The words unless already done in paragraph f of this AD, in conjunction with the requirements of paragraphs g and h of this AD, which specify that operators use Bell Alert Service Bulletin 42919
50, Revision B, as the appropriate source of information, already account for the use of Bell Alert Service Bulletin 4291950, Revision B, prior to the effective date of this AD. Therefore, if operators have accomplished the actions required for compliance with this AD
before the effective date of this AD, no further action is necessary and it is not necessary to include Bell Alert Service Bulletin 4291950, Revision B, in paragraph j of this AD the Credit for
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Discussion of Final Airworthiness Directive Comments The FAA received a comment from one commenter, Air Methods. The following presents the comment received on the NPRM and the FAAs response.
Request To Include Additional Revision Level in Credit Paragraph
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Previous Actions paragraph. The FAA
has not revised this AD in this regard.
Conclusion These helicopters have been approved by the aviation authority of Canada and are approved for operation in the United States. Pursuant to the FAAs bilateral agreement with Canada, Transport Canada, its technical representative, has notified the FAA of the unsafe condition described in its AD. The FAA reviewed the relevant data, considered the comment received, 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. Except for minor editorial changes, this AD is adopted as proposed in the NPRM.
None of the changes will increase the economic burden on any operator.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Bell Alert Service Bulletin 4291950, Revision B. This service information specifies procedures for an initial inspection of the lower surface of the spherical bearing in the directional control bellcrank assembly to determine if it is properly staked, additional inspections, and corrective actions. The corrective actions include installation of a new spherical bearing, repair including re-identification of the bellcrank assembly part number, and replacement of the bellcrank assembly.
The additional inspections include an inspection of the upper surface of the spherical bearing in the directional control bellcrank assembly to determine if it is properly staked, an inspection of the bore in the bellcrank assembly for excessive wear including mechanical or corrosion damage that exceed 0.001
inch 0.03 millimeter maximum depth for 4 of the circumference, and any cracking; and, for any helicopter with a bellcrank assembly that is repaired, repetitive inspections of the lower surface of the spherical bearing to determine if it has moved.
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.
Other Related Service Information The FAA also reviewed Bell Alert Service Bulletin 4291950, dated November 27, 2019; and Revision A, dated December 2, 2019. Bell Alert Service Bulletin 4291950, dated November 27, 2019, specifies procedures for an initial inspection of the spherical bearing in the directional control bellcrank assembly to determine
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