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Federal Register / Vol. 86, No. 138 / Thursday, July 22, 2021 / Proposed Rules DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210573; Project Identifier 2018CE046AD
RIN 2120AA64

Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes Federal Aviation Administration FAA, DOT.
ACTION: Notice of proposed rulemaking NPRM.
AGENCY:

The FAA proposes to adopt a new airworthiness directive AD for Pilatus Aircraft Ltd. Pilatus Models PC12/45, PC12/47, and PC12/47E
airplanes with Supplemental Type Certificate STC SA00634DE installed.
This proposed AD was prompted by a report of strake attachment brackets and the fuselage frame failing at the upper most bracket attachment location. This proposed AD would require inspecting the strake, attachment brackets, surrounding structure, and bolts and replacing components and repairing damage if necessary. The FAA is proposing this AD to address the unsafe condition on these products.
DATES: The FAA must receive comments on this proposed AD by September 7, 2021.
SUMMARY:

You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to https www.regulations.gov. Follow the instructions for submitting comments.
Fax: 202 4932251.
Mail: U.S. Department of Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
Hand Delivery: Deliver to Mail address above between 9 a.m. and 5
p.m., Monday through Friday, except Federal holidays.
For service information identified in this NPRM, contact Pilatus Business Aircraft Ltd., Customer Support Department, 12300 Pilatus Way, Broomfield, CO 80021; phone: 866
7212435; fax: 303 4659099; email:
productsupport@pilbal.com. You may view this service information at the 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.

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ADDRESSES:

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Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210573; 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 NPRM, any comments received, and other information. The street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Richard R. Thomas, Aviation Safety Engineer, Denver ACO Branch, FAA, 26805 E 68th Avenue, Denver, CO
80249; phone: 303 3421080; fax: 303
3421088; email: 9-Denver-AircraftCert@faa.gov.
SUPPLEMENTARY INFORMATION:
Comments Invited The FAA invites you to send any written relevant data, views, or arguments about this proposal. Send your comments to an address listed under ADDRESSES. Include Docket No.
FAA20210573; Project Identifier 2018CE046AD at the beginning of your comments. The most helpful comments reference a specific portion of the proposal, explain the reason for any recommended change, and include supporting data. The FAA will consider all comments received by the closing date and may amend this proposal because of those comments.
Except for Confidential Business Information CBI as described in the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to https
www.regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this NPRM.
Confidential Business Information CBI is commercial or financial information that is both customarily and actually treated as private by its owner.
Under the Freedom of Information Act FOIA 5 U.S.C. 552, CBI is exempt from public disclosure. If your comments responsive to this NPRM
contain commercial or financial information that is customarily treated as private, that you actually treat as private, and that is relevant or responsive to this NPRM, it is important that you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI
as PROPIN. The FAA will treat such marked submissions as confidential under the FOIA, and they will not be placed in the public docket of this
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NPRM. Submissions containing CBI
should be sent to Richard R. Thomas, Aviation Safety Engineer, Denver ACO
Branch, FAA, 26805 E 68th Avenue, Denver, CO 80249. Any commentary that the FAA receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.
Background The FAA received a report that an operator found that one of the fuselage strakes was loose having excess play on two different Pilatus Model PC12/
47E airplanes. Further inspection found the fuselage main frame at frame station 40 and the strake attachment brackets had cracks extending from the attachment bolt hole at the upper most attachment location. Both airplanes had a SPECTRE Lift Platform System, STC
SA00634DE, installed. The deployment of the lift platform causes buffeting of the strakes. This condition, if not addressed, could result in airplane flutter and reduced lateral stability, which may lead to loss of control of the airplane.
FAAs Determination The FAA is issuing this NPRM after determining that the unsafe condition described previously is likely to exist or develop on other products of the same type design.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Pilatus Service Bulletin PC12 Series, Report Number 121700640000, Revision B, dated August 10, 2018 Pilatus Report 12
1700640000B, which contains procedures for inspection of all fuselage strake attachment bolts and the surrounding structure. 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.
Proposed AD Requirements in This NPRM
This proposed AD would require inspecting the strake, attachment brackets, and bolts for movement and damage, both internal and external, and replacing or repairing any damaged parts.
Differences Between This Proposed AD
and the Service Information Pilatus Report 121700640000B
specifies a one-time inspection within 10 flight hours of issuance of the SB and recommends repeat inspections without specifying an inspection interval. This
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