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Federal Register / Vol. 86, No. 110 / Thursday, June 10, 2021 / Rules and Regulations
PC24 AMM Report 02378, Issue 005, Revision 19, dated May 26, 2020.
ii Horizontal stabilizer primary trim system secondary power sourceOperation test, AMM data module PC24AE2740
000001A320AA, dated September 25, 2019, from PC24 AMM Report 02378, Issue 005, Revision 19, dated May 26, 2020.
3 For Pilatus Aircraft Ltd. service information identified in this AD, contact Pilatus Aircraft Ltd., Customer Support General Aviation, CH6371 Stans, Switzerland; phone: +41 848 24 7 365; email:
techsupport.ch@pilatus-aircraft.com;
website: https www.pilatus-aircraft.com.
4 You may view this service information at FAA, Airworthiness Products Section, Operational Safety Branch, 901 Locust, Kansas City, MO 64106. For information on the availability of this material at the FAA, call 816 3294148.
5 You may view this service information that is incorporated by reference at the National Archives and Records Administration NARA. For information on the availability of this material at NARA, email: fedreg.legal@nara.gov, or go to:
https www.archives.gov/federal-register/cfr/
ibr-locations.html.
Issued on May 7, 2021.
Gaetano A. Sciortino, Deputy Director for Strategic Initiatives, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202112045 Filed 6921; 8:45 am BILLING CODE 491013P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20201175; Product Identifier 2018SW071AD; Amendment 3921563; AD 20211101
RIN 2120AA64

Airworthiness Directives; Bell Textron Canada Limited Helicopters Federal Aviation Administration FAA, DOT.
ACTION: Final rule.
AGENCY:

The FAA is superseding Airworthiness Directive AD 201320
13 for certain Bell Helicopter Textron Canada Limited now Bell Textron Canada Limited Bell Model 206B and 206L helicopters. AD 20132013
required installing a placard beneath the engine power dual tachometer and revising the Operating Limitations section of the existing Rotorcraft Flight Manual RFM for your helicopter. This AD was prompted by the engine manufacturer expanding the RPM N2
steady-state operation avoidance range limits. This AD retains certain requirements of AD 20132013, and
khammond on DSKJM1Z7X2PROD with RULES

SUMMARY:

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requires revising certain sections of the existing RFM for your helicopter and installing or replacing a placard. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective July 15, 2021.
The Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD
as of July 15, 2021.
ADDRESSES: For service information identified in this final rule, contact Bell Textron Canada Limited, 12,800 Rue de lAvenir, Mirabel, Quebec J7J1R4;
telephone 450 4372862 or 800 363
8023; fax 450 4330272; or at https
www.bellcustomer.com. You may view this service information at the FAA, Office of the Regional Counsel, Southwest Region, 10101 Hillwood Pkwy., Room 6N321, Fort Worth, TX
76177. For information on the availability of this material at the FAA, call 817 2225110. Service information that is incorporated by reference is also available on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2020
1175.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20201175; 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, M30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Michael Hughlett, Aviation Safety Engineer, General Aviation & Rotorcraft Section, International Validation Branch, FAA, 10101 Hillwood Pkwy., Fort Worth, TX 76177; telephone 817
2225889; email Michael.Hughlett@
faa.gov.
SUPPLEMENTARY INFORMATION:
Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 to supersede AD 20132013, Amendment 3917619 78 FR 66252, November 5, 2013, AD 20132013.
AD 20132013 applied to Bell Model 206B helicopters, serial number S/N
004 through 4675, including helicopters converted from Model 206A; and Bell Model 206L helicopters, S/N 45001

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through 45153, and 46601 through 46617. The NPRM published in the Federal Register on March 11, 2021 86
FR 13828. The NPRM proposed to require, within 25 hours time-in-service TIS, revising the Operating Limitations and the Normal Procedures sections of the existing RFM for your helicopter and installing or replacing a placard.
The NPRM was prompted by a determination from the manufacturers that the steady-state operation avoidance range limits needed to be expanded, amendments to the RFM
needed to be incorporated, and a new placard decal needed to be installed.
Transport Canada AD CF201823, dated August 22, 2018 AD CF2018
23, issued by Transport Canada, which is the aviation authority for Canada, corrects an unsafe condition for Bell Model 206B series helicopters including those converted from Model 206A, S/Ns up to 4690, and model 206L series helicopters, S/Ns 45001 through 45153
and 46601 through 46617. Transport Canada 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. 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. This condition, if not addressed, could result in turbine failure, engine power loss, and subsequent loss of control of the helicopter.
Accordingly, Transport Canada AD
CF201823 requires incorporating the amended RFM power plant operating limitations and engine starting procedures for RPM N2 steady-state operation and installing a new decal.
Discussion of Final Airworthiness Directive Comments The FAA received no comments on the NPRM or on the determination of the costs.
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
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