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Federal Register / Vol. 86, No. 148 / Thursday, August 5, 2021 / Rules and Regulations information. The address for Docket Operations is U.S. Department of Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12 140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Barbara Caufield, Aviation Safety Engineer, ECO Branch, FAA, 1200
District Avenue, Burlington, MA 01803;
phone: 781 2387146; fax: 781 238
7199; email: barbara.caufield@faa.gov.
SUPPLEMENTARY INFORMATION:
Background
Failure of the impeller or HP compressor rotor could result in the uncontained release of the impeller or the HP compressor rotor, and subsequently could result in damage to the engine, damage to the helicopter, and loss of control of the helicopter.
This Transport Canada AD mandates the use of the Manual Low Cycle Fatigue LCF
Counting method to ensure that the impeller and HP compressor rotor do not exceed their published life limits.

You may obtain further information by examining the MCAI in the AD
docket at https www.regulations.gov by searching for and locating Docket No.
FAA20200103.

The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to all P&WC PW210A and PW210S model turboshaft engines. The NPRM published in the Federal Register on February 26, 2021 86 FR
11651. The NPRM was prompted by a report from the manufacturer that the ADTS may under-count the number of cycles accrued by the impeller and the HPC rotor. The impeller and HPC rotor are both life-limited components and exceeding their published life limits could result in the failure of these components. In the NPRM, the FAA
proposed to require the use of the manual LCF counting method in place of the ADTS counting method to determine the number of cycles accrued by the impeller and HPC rotor. The FAA
is issuing this AD to address the unsafe condition on these products.
Transport Canada Civil Aviation Transport Canada, which is the aviation authority for Canada, has issued Transport Canada AD CF2020
13, dated April 28, 2020 referred to after this as the MCAI, to address the unsafe condition on these products. The MCAI states:

Discussion of Final Airworthiness Directive
The engine manufacturer has discovered that the Automated Damage Tracking System ADTS may under-count the number of cycles accrued by the impeller and the High Pressure HP compressor rotor. The impeller and HP compressor rotor are both life limited components and exceeding their published life limits could result in the failure of these components.

Related Service Information Under 1
CFR Part 51
The FAA reviewed Pratt & Whitney Canada Corp. Alert Service Bulletin ASB No. PW21072A57142, Revision No. 1, dated March 26, 2020 ASB No.
PW21072A57142; and Pratt &
Whitney Canada Corp. ASB No.

Comments The FAA received comments from one commenter. The individual commenter supported the NPRM
without change.
Clarification That Reporting Is Not Required The FAA added paragraph i to this AD to clarify that the reporting specified in P&WC Alert Service Bulletin ASB
No. PW21072A57142, Revision No. 1, dated March 26, 2020, and P&WC ASB
No. PW21072A57143, Revision No. 1, dated March 26, 2020, is not required by this AD.
Conclusion The FAA reviewed the relevant data, considered the comments received, and determined that air safety requires adopting the AD as proposed.
Accordingly, the FAA is issuing this AD
to address the unsafe condition on these products. Except for minor editorial changes, and any other changes described previously, this AD is adopted as proposed in the NPRM.

42699

PW21072A57143, Revision No. 1, dated March 26, 2020 ASB No. PW210
72A57143. ASB No. PW21072
A57142 specifies procedures for calculating the correct, current LCF
cycle count for the impeller and HPC
rotor on PW210A model turboshaft engines. ASB No. PW21072A57143
specifies procedures for calculating the correct, current LCF cycle count for the impeller and HPC rotor installed on PW210S model turboshaft engines. 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 ADDRESSES.
Other Related Service Information The FAA reviewed Pratt & Whitney Canada Corp. Task 000000860801
and Task 000000860803 of Pratt &
Whitney Canada Corp. Engine Maintenance Manual EMM, Manual Part No. 30L2392, Airworthiness Limitations Section ALS, both at Revision 13, dated September 28, 2020.
Pratt & Whitney Canada Corp. Task 000000860801 of Pratt & Whitney Canada Corp. EMM, Manual Part No.
30L2392, identifies the LCF life limits for the impeller and HPC rotor. Pratt &
Whitney Canada Corp. Task 000000
860803 of Pratt & Whitney Canada Corp. EMM, Manual Part No. 30L2392, describes procedures for manually calculating the correct, current LCF
cycle count for the impeller and HPC
rotor and provides the formula for manually calculating the accumulated total cycles for the impeller and HPC
rotor.
Interim Action The FAA considers this AD to be an interim action. If final action is later identified, the FAA might consider additional rulemaking.
Costs of Compliance The FAA estimates that this AD
affects 66 engines installed on helicopters of U.S. registry.
The FAA estimates the following costs to comply with this AD:

khammond on DSKJM1Z7X2PROD with RULES

ESTIMATED COSTS
Action
Labor cost
Parts cost
Cost per product
Cost on U.S.
operators
Manually calculate LCF cycles

1 work-hour $85 per hour = $85

$0

$85

$5,610

Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs authority to issue rules on aviation safety. Subtitle I,
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section 106, describes the authority of the FAA Administrator. Subtitle VII:
Aviation Programs, describes in more
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detail the scope of the Agencys authority.
The FAA is issuing this rulemaking under the authority described in
E:FRFM05AUR1.SGM

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