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Federal Register / Vol. 86, No. 87 / Friday, May 7, 2021 / Proposed Rules affected part is installed by doing a maintenance records check or inspection, and if an affected part is found, replacement with a non-affected part. The NPRM was prompted by a report that a certain disc assembly, sold as an alternate part, does not conform to the approved configuration.
Transport Canada Civil Aviation TCCA, which is the aviation authority for Canada, issued Canadian AD CF
201007, dated February 24, 2010
Canadian AD CF201007, to correct an unsafe condition for certain Bell Helicopter Textron Canada Limited now Bell Textron Canada Limited Model 206A, 206B, 206L, 206L1, 206L3, and 206L4 helicopters. TCCA
advises that a certain tail rotor disc assembly, sold through Bell Helicopter Spares beginning March 2009, as an alternate, does not conform to the approved configuration. TCCA stated operating a helicopter with the affected tail rotor disc assembly could result in loss of control of the helicopter.
Accordingly, the Canadian AD
requires determining if an affected part is installed, and if an affected part is found, replacement with a non-affected part.
Actions Since the NPRM Was Issued Since the NPRM was issued, the AD
format has been revised, and certain paragraphs have been rearranged. As a result, the corresponding paragraph identifiers have changed in this proposed AD in the SNPRM, as listed in the following table:
Requirement in the proposed AD
in the NPRM
paragraph f
paragraph f1

Corresponding requirement in this proposed AD
in the SNPRM
paragraph g.
paragraph g1.

Requirement in the proposed AD
in the NPRM
paragraph paragraph paragraph paragraph
f2
f3
f4
f5

Corresponding requirement in this proposed AD
in the SNPRM
paragraph paragraph paragraph paragraph
g2.
g3.
g4.
h.

The FAA also has removed the table following paragraph c of the proposed AD in the NPRM, which identified the model and serial numbers; instead, the model and serial numbers are included in paragraphs c1 through 6 of this proposed AD in the SNPRM.
In addition, the text no further action is required is removed from paragraph g3 of this proposed AD in the SNPRM as the parts installation prohibition specified in paragraph h of this proposed AD in the SNPRM also applies to helicopters accomplishing the action in paragraph g3 of this proposed AD in the SNPRM.
These changes do not affect the intent of the actions in the proposed AD in the NPRM. However, since a significant amount of time has elapsed since the NPRM, the FAA is reopening the comment period to allow the public a chance to comment on the proposed actions.
Comments The FAA received no comments on the NPRM or on the determination of the cost.
FAAs Determination 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, TCCA, its technical representative, has notified the FAA of the unsafe condition
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described in its AD. The FAA is proposing this AD after determining the unsafe condition described previously is likely to exist or develop in other helicopters of the same type design.
Certain changes described above expand the scope of the NPRM. As a result, it is necessary to reopen the comment period to provide additional opportunity for the public to comment on this SNPRM.
Related Service Information Under 1
CFR Part 51
The FAA reviewed the following service information. This service information specifies procedures to determine if an affected part is installed, and if an affected part is found, replacement with a non-affected part.
These documents are distinct since they apply to different helicopter models.
Bell Helicopter Alert Service Bulletin 20609123, Revision A, dated June 10, 2009.
Bell Helicopter Alert Service Bulletin 206L09157, Revision A, dated June 10, 2009.
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 in This SNPRM
This proposed AD would require accomplishing the actions specified in the service information already described.
Costs of Compliance The FAA estimates that this proposed AD affects 1,493 helicopters of U.S.
registry. The FAA estimates the following costs to comply with this proposed AD:

ESTIMATED COSTS FOR REQUIRED ACTIONS
Labor cost
Parts cost
Cost per product
Cost on U.S.
operators
1 work-hour $85 per hour = $85

$303

$388

$579,284

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
VerDate Sep<11>2014

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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.

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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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