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Federal Register / Vol. 86, No. 46 / Thursday, March 11, 2021 / Proposed Rules engine power loss, and subsequent loss of control of the helicopter.
Actions Since AD 20132013 Was Issued Since the FAA issued AD 201320
13, Transport Canada, which is the aviation authority for Canada, issued Canadian AD No. CF201823, dated August 22, 2018, which advises that Rolls Royce has expanded the RPM N2
steady-state operation avoidance range limits due to several failures of the third stage turbine wheel. According to Transport Canada, Rolls Royce determined that detrimental vibrations could occur within a particular range of turbine speeds, which may be a contributing factor to these failures.
Accordingly, Rolls Royce has expanded the steady-state operation avoidance range limits. Bell has also amended the RFMs and the engine starting procedures for RPM N2 and provided a new decal placard to inform pilots to avoid steady-state operations at those engine turbine speeds. The Transport Canada AD mandates incorporating the amended RFM power plant operating limitations and engine starting procedures for RPM N2 steady-state operation and installing a new decal.

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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, Transport Canada, its technical representative, has notified the FAA of the unsafe condition described in the Transport Canada 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.
Related Service Information Under 1
CFR Part 51
The FAA reviewed the following service information, which contains revised operating limitations and engine starting instructions:
Section 1, Operating Limitations, page 12A, of Bell Model 206B RFM
BHT206BFM1, Revision B54, dated May 30, 2018 BHT206BFM1.
Section 2, Normal Procedures, page 28 of BHT206BFM1.
Section 1, Limitations, page 15, of Bell Model 206B3 RFM BHT206B3
FM1, Revision 17, dated May 30, 2018
BHT206B3FM1.
Section 2, Normal Procedures, page 210 of BHT206B3FM1.
Section 1, Operating Limitations, page 14B, of Bell Model 206L RFM

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BHT206LFM1, Revision 31, dated May 30, 2018 BHT206LFM1.
Section 2, Normal Procedures, page 210 of BHT206LFM1.
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 reviewed Bell Alert Service Bulletin ASB 20607115, Revision D, for Model 206A and 206B helicopters, and ASB 206L07146, Revision C, for Model 206L helicopters, each dated July 9, 2018. This service information contains procedures for installing a decal placard on the instrument panel below the Nr/N2 RPM dual tachometer indicator and inserting the RFM changes into the RFM.
Proposed AD Requirements This proposed AD would require revising the Operating Limitations and the Normal Procedures sections of the existing RFM for your helicopter. This proposed AD would also require installing or replacing a placard. The proposed actions would be required within 25 hours time-in-service TIS.
Differences Between This Proposed AD
and the Transport Canada AD
The Transport Canada AD requires compliance within 30 calendar days, while this proposed AD would require compliance within 25 hours TIS.
Costs of Compliance The FAA estimates that this proposed AD would affect 934 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.
Amending the existing RFM for your helicopter would take about 0.5 workhour, for an estimated cost of $43 per helicopter and $40,162 for the U.S. fleet.
Installing or replacing a placard would take about 0.2 work-hour and parts would cost about $20, for a cost of $37 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
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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.
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.
For the reasons discussed, I certify this proposed regulation:
1. Is not a significant regulatory action under Executive Order 12866, 2. Will not affect intrastate aviation in Alaska, and 3. Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
The Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows:
PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by:
a. Removing airworthiness directive AD 20132013, Amendment 39
17619 78 FR 66252, November 5, 2013;
and b. Adding the following new AD:

Bell Textron Canada Limited Helicopters:
Docket No. FAA20201175; Product Identifier 2018SW071AD.
a Applicability This airworthiness directive AD applies to the following Bell Textron Canada Limited Bell helicopters, certificated in any category:

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