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Federal Register / Vol. 86, No. 112 / Monday, June 14, 2021 / Proposed Rules
Notice of proposed rulemaking NPRM.

ACTION:

The FAA proposes to adopt a new airworthiness directive AD for certain Bombardier, Inc., CL6002B16
604 Variant airplanes. This proposed AD was prompted by multiple reports of cracking of the main landing gear MLG
shock strut lower pin. This proposed AD would require repetitive lubrication and repetitive detailed visual inspections DVI and non-destructive test NDT inspections of the MLG shock strut lower pins, and replacement 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 July 29, 2021.
ADDRESSES: 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: 2024932251.
Mail: U.S. Department of Transportation, Docket Operations, M30, 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 Bombardier, Inc., 200 Cote-Vertu Road West, Dorval, Quebec H4S 2A3, Canada; North America toll-free telephone 1866538
1247 or direct-dial telephone 1514
8552999; email ac.yul@
aero.bombardier.com; internet https
www.bombardier.com. You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this material at the FAA, call 2062313195.
SUMMARY:

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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.
FAA20210462; 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:
Chirayu Gupta, Aerospace Engineer, Mechanical Systems and Administrative Services Section, FAA, New York ACO

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Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 5162287300; fax 5167945531; email 9-avs-nyaco-cos@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.
FAA20210462; Project Identifier MCAI202001714T 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 the 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 NPRM. Submissions containing CBI
should be sent to Chirayu Gupta, Aerospace Engineer, Mechanical Systems and Administrative Services Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516
2287300; fax 5167945531; email 9avs-nyaco-cos@faa.gov. Any commentary that the FAA receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.

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Background Transport Canada Civil Aviation TCCA, which is the aviation authority for Canada, has issued TCCA AD CF
202054R1, dated December 23, 2020
TCCA AD CF202054R1 also referred to after this as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for certain Bombardier, Inc., CL6002B16 604 Variant airplanes.
You may examine the MCAI in the AD
docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210462.
This proposed AD was prompted by multiple reports of cracking of the MLG
shock strut lower pin part number P/N
191463. The subsequent investigation concluded that the friction torque when the shock strut is under compression loading, causes the pin anti-rotation tangs to become loaded beyond their load carrying capability. This overload condition can result in pin fracture originating at the base of the pin antirotation tang. Inadequate lubrication aggravates the condition. The FAA is proposing this AD to address cracking of the MLG shock strut lower pin. If not addressed, this condition could result in structural failure of one or both MLG.
See the MCAI for additional background information.
Related Service Information Under 1
CFR Part 51
Bombardier, Inc., has issued the following service information:
Service Bulletin 60432030, dated June 30, 2020.
Service Bulletin 60532007, dated June 30, 2020.
Service Bulletin 65032004, dated June 30, 2020.
This service information describes procedures for lubricating, inspecting DVI and NDT inspections for cracking and damage, including fracture of the MLG shock strut lower pin at the pin rotation tang location, and replacing the MLG shock strut lower pin. These documents are distinct since they apply to different airplane configurations. 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.
FAAs Determination This product has been approved by the aviation authority of another country, and is approved for operation in the United States. Pursuant to the FAAs bilateral agreement with the State of Design Authority, the FAA has been notified of the unsafe condition
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