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Federal Register / Vol. 86, No. 150 / Monday, August 9, 2021 / Proposed Rules DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210620; Project Identifier 2019SW074AD
RIN 2120AA64

Airworthiness Directives; Helicopteres Guimbal Helicopters Federal Aviation Administration FAA, DOT.
ACTION: Notice of proposed rulemaking NPRM.
AGENCY:

The FAA proposes to adopt a new airworthiness directive AD for Helicopteres Guimbal HG Model Cabri G2 helicopters with certain partnumbered aluminum cooling fans cooling fan installed. This proposed AD was prompted by reports of two occurrences of in-flight shutdowns due to a crack and subsequent failure of the cooling fan. This proposed AD would require removing certain part-numbered cooling fans from service, or modifying certain part-numbered cooling fans before exceeding a certain total hours time-in-service TIS, and installing newly designed cooling fans. This proposed AD would also prohibit installing any affected cooling fan on any helicopter. 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 23, 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: 202 4932251.
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 between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays.
For service information identified in this NPRM, contact Helicopteres Guimbal, Basile Ginel, 1070, rue du Lieutenant Parayre, Aerodrome dAixen-Provence, 13290 Les Milles, France;
telephone 330442391088; email basile.ginel@guimbal.com; web https
www.guimbal.com. You may view this service information at the FAA, Office of the Regional Counsel, Southwest
lotter on DSK11XQN23PROD with PROPOSALS1

SUMMARY:

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Region, 10101 Hillwood Pkwy., Room 6N321, Fort Worth, TX 76177. For information on the availability of this material at the FAA, call 817 222
5110.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210620; 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, the European Union Aviation Safety Agency EASA AD, any comments received, and other information. The street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Andrea Jimenez, Aerospace Engineer, COS Program Management Section, Operational Safety Branch, Compliance & Airworthiness Division, FAA, 1600
Stewart Ave., Suite 410, Westbury, NY
11590; telephone 516 2287330; email andrea.jimenez@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.
FAA20210620; Project Identifier 2019SW074AD 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
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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 Andrea Jimenez, Aerospace Engineer, COS Program Management Section, Operational Safety Branch, Compliance &
Airworthiness Division, FAA, 1600
Stewart Ave., Suite 410, Westbury, NY
11590; telephone 516 2287330; email andrea.jimenez@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.
Background EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD 20140038, dated February 14, 2014 EASA AD
20140038, to correct an unsafe condition for Helicopteres Guimbal Model Cabri G2 helicopters. EASA
advises of a report of an in-flight engine shutdown caused by a failure of the cooling fan. EASA further advises the failure of the cooling fan was caused by a crack in the fan external ring. After EASA AD 20140038 was issued, a second occurrence was reported of an in-flight engine shutdown caused by failure of the cooling fan, which was determined to be caused by a crack on the cooling fan front flange.
Accordingly, EASA issued EASA AD
20140196, dated September 2, 2014
EASA AD 20140196, which retained the modification requirements of EASA
AD 20140038 and required repetitive inspections of the engine cooling fan front flange and corrective actions depending on the findings. After EASA
issued EASA AD 20140196, further analysis determined the crack was caused by the engine start/stop ESS
cycles. Therefore, EASA superseded EASA AD 20140196 with EASA AD
20160033, dated February 24, 2016
EASA AD 20160033, which retained the inspection and modification requirements of EASA AD 20140196
and depending on the findings, required replacement of the affected part pending approval of the newly designed part.
After EASA issued EASA AD 2016
0033, HG developed a newly designed engine cooling fan part number P/N
G5204101, which consists of composite materials having improved structural strength. Accordingly, EASA
superseded EASA AD 20160033 with EASA AD 20170039, dated February
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