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Federal Register / Vol. 86, No. 54 / Tuesday, March 23, 2021 / Proposed Rules
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20201170; Project Identifier MCAI202000720R
RIN 2120AA64

Airworthiness Directives; Bell Textron Canada Limited Helicopters Federal Aviation Administration FAA, DOT.
ACTION: Notice of proposed rulemaking NPRM.
AGENCY:

The FAA proposes to adopt a new airworthiness directive AD for Bell Textron Canada Limited Bell Model 429 helicopters. This proposed AD would require inspecting certain serial-numbered Emergency Flotation System EFS inflation hoses and depending on the results of those inspections, marking certain parts or removing certain parts from service.
This proposed AD was prompted by a report that a float compartment on an EFS did not inflate. The actions of this proposed AD are intended to address an unsafe condition on these products.
DATES: The FAA must receive comments on this proposed AD by May 7, 2021.
ADDRESSES: You may send comments by any of the following methods:
Federal eRulemaking Docket: Go to https www.regulations.gov. Follow the online instructions for sending your comments electronically.
Fax: 2024932251.
Mail: Send comments to the U.S.
Department of Transportation, Docket Operations, M30, West Building Ground Floor, Room W12140, 1200
New Jersey Avenue SE, Washington, DC
205900001.
Hand Delivery: Deliver to the Mail address between 9 a.m. and 5
p.m., Monday through Friday, except Federal holidays.
SUMMARY:

Examining the AD Docket You may examine the AD docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2020
1170; 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 proposed AD, the Transport Canada AD, any comments received, and other information. The street address for Docket Operations is listed above.
Comments will be available in the AD
docket shortly after receipt.
For service information identified in this proposed rule, contact Bell Textron
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17:08 Mar 22, 2021

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Canada Limited, 12,800 Rue de lAvenir, Mirabel, Quebec J7J1R4; telephone 450
4372862 or 8003638023; fax 450
4330272; or at https
www.bellcustomer.com. You may view this referenced service information at the FAA, Office of the Regional Counsel, Southwest Region, 10101 Hillwood Pkwy., Room 6N321, Fort Worth, TX
76177.

should be sent to Daniel E. Moore, Aviation Safety Engineer, Denver ACO
Branch, Compliance & Airworthiness Division, FAA, 26805 East 68th Ave., Denver, CO 80249; telephone 303342
1086; ; email daniel.e.moore@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.

FOR FURTHER INFORMATION CONTACT:

Discussion Transport Canada, which is the aviation authority for Canada, has issued Canadian AD No. CF2020
21R1, issued August 19, 2020 to correct an unsafe condition for Bell Model 429
helicopters, all serial numbers. The Transport Canada AD advises that during maintenance on an EFS, the third compartment of the left forward float did not inflate. Transport Canada advises that an investigation determined the supply hose for the gas flow from the pressurized cylinder to the float compartment was blocked due to a manufacturing defect. Bell advised that similar supply hoses are installed on various EFS part numbers, which could be installed on different helicopter type designs. Transport Canada advises that this condition, if not detected and corrected, could result in partial inflation of the EFS during an emergency landing on water, preventing a timely egress from the helicopter, and injury to helicopter occupants.

Daniel E. Moore, Aviation Safety Engineer, Denver ACO Branch, Compliance & Airworthiness Division, FAA, 26805 East 68th Ave., Denver, CO
80249; telephone 3033421086; email daniel.e.moore@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.
FAA20201170; Project Identifier MCAI202000720R 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 proposal.
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

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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 Safran Aerosystems Services Service Bulletin No. 0256921, Revision 00, dated, March 23, 2020 SB 0256921. SB
0256921 is attached as an appendix to Bell Alert Service Bulletin No. 42920
52, dated March 30, 2020 ASB 42920
52. SB 0256921 is proposed for incorporation by reference in this proposed AD. ASB 4292052 is not proposed for incorporation by reference in this proposed AD. SB 0256921
specifies, for certain EFSs manufactured
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