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Federal Register / Vol. 86, No. 143 / Thursday, July 29, 2021 / Rules and Regulations
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 final rule, contact Bell Textron, Inc., P.O. Box 482, Fort Worth, TX 76101, United States; telephone 1450437
2862 or 18003638023; fax 1450
4330272; email productsupport@
bellflight.com; or at https
www.bellflight.com/support/contactsupport. You may view this service information at the FAA, Office of the Regional Counsel, Southwest Region, 10101 Hillwood Pkwy., Room 6N321, Fort Worth, TX 76177. For information on the availability of this material at the FAA, call 817 2225110.

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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.
FAA20210605; 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 final rule, the Transport Canada AD, any comments received, and other information. The street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
David Wilson, Aerospace Engineer, DSCO Branch, Compliance &
Airworthiness Division, FAA, 10101
Hillwood Pkwy., Fort Worth, TX 76177;
telephone 817 2225786; email david.wilson@faa.gov.
SUPPLEMENTARY INFORMATION:
Background On July 6, 2021, the FAA issued Emergency AD 20211551 Emergency AD 20211551 for Bell Textron Inc.
Model 204B, 205A, 205A1, 205B, and 212 helicopters. That action was prompted by a Bell Textron Inc., Model 212 helicopter fatal accident in which a pin part number P/N 204012104
005 with a serial number S/N prefix FNFS sheared off during flight, resulting in the main rotor blade and the main rotor head detaching from the helicopter. The pin had accumulated only 20 total hours time-in-service TIS.
An inspection of a different Model 212
helicopter revealed that another pin installed, and made by the same manufacturer with the same S/N prefix, was deformed; this pin had accumulated only 29 total hours TIS.
Failure of the pin could result in the main rotor blade detaching from the helicopter and subsequent loss of control of the helicopter.

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Transport Canada, which is the aviation authority for Canada, has issued Canadian Emergency AD CF
202123, dated July 5, 2021 Transport Canada Emergency AD CF202123, to correct an unsafe condition for Bell Helicopter Textron Inc., Model 204B
helicopters, S/Ns 2001 through 2070
and 2196 through 2199; Model 205A1
helicopters, S/Ns 30001 through 30065, 30067 through 30165, 30167 through 30187, 30189 through 30296, and 30298
through 30332; Model 205B helicopters, S/Ns 30066, 30166, 30188, and 30297;
and Model 212 helicopters, S/Ns 30501
through 30999, 31101 through 31311, 32101 through 32142, and 35001
through 35103. Transport Canada advises that during an investigation of a Bell Textron Inc., Model 212 fatal accident in Canada, it was discovered that a pin P/N 204012104005 with an S/N prefix FNFS, sheared off during flight, leading to detachment of the main rotor blade and the main rotor head. The pin had accumulated only 20
hours of service, and inspection of another Canadian Bell Textron Inc., Model 212 helicopter found a pin of the same P/N, made by the same manufacturer, with the same S/N prefix FNFS, to be deformed after only approximately 29 hours in service.
According to Transport Canada, failure of a pin will result in detachment of the main rotor blade and loss of control of the helicopter. Transport Canada also advises that, although the defective pins were only reported on Bell Textron Inc., Model 212 helicopters, pins of the same P/N can also be installed on Bell Textron Inc., Model 204B, 205A1, and 205B helicopters. While the cause of failure has not been determined, as a precautionary measure and to address the risk of detachment of affected pins in flight, Bell has issued alert service bulletins that specify replacing pins P/N 204012104005 that have S/N
prefix FNFS.
Accordingly, Transport Canada Emergency AD CF202123 requires replacement of affected pins. Transport Canada considers its emergency AD an interim action and states that further AD
action may follow.
After Emergency AD 20211551 was issued, the FAA determined that pin P/N 204012104005 with S/N prefix FNFS could also be installed on restricted category helicopters originally manufactured by Bell Textron Inc.
These helicopters include, but are not limited to, the following:
Rotorcraft Development Corporation Model HH1K helicopters;
Robinson Air Crane Inc.; Rotorcraft Development Corporation; and
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Tamarack Helicopters, Inc., Model TH1F helicopters;
Bell Textron Inc.; Overseas Aircraft Support, Inc. type certificate previously held by JTBAM, Inc.; and Rotorcraft Development Corporation Model TH1L
helicopters;
Richards Heavylift Helo, Inc., Model UH1A helicopters;
International Helicopters, Inc.;
Overseas Aircraft Support, Inc.; Red Tail Flying Services, LLC; Richards Heavylift Helo, Inc.; Rotorcraft Development Corporation; Southwest Florida Aviation International, Inc. helicopters with an SW204 or SW204HP
designation are Southwest Florida Aviation International, Inc., Model UH1B helicopters; and WSH, LLC
type certificate previously held by San Joaquin Helicopters, Model UH1B
helicopters;
Bell Textron Inc.; Overseas Aircraft Support, Inc.; Rotorcraft Development Corporation; Smith Helicopters; and West Coast Fabrications Model UH1E
helicopters;
AST, Inc.; California Department of Forestry; Robinson Air Crane, Inc.;
Rotorcraft Development Corporation;
and Tamarack Helicopters, Inc., Model UH1F helicopters;
Arrow Falcon Exporters Inc.; Global Helicopter Technology, Inc.; Hagglund Helicopters, LLC; JJASPP Engineering Services, LLC; Northwest Rotorcraft, LLC; Overseas Aircraft Support, Inc.;
Richards Heavylift Helo, Inc.; Rotorcraft Development Corporation; Southwest Florida Aviation International, Inc.
helicopters with an SW205 designation are Southwest Florida Aviation International, Inc., Model UH1H
helicopters; and Tamarack Helicopters, Inc., Model UH1H helicopters;
Bell Textron Inc.; Overseas Aircraft Support, Inc.; and Rotorcraft Development Corporation Model UH1L
helicopters; and Robinson Air Crane, Inc.; and Rotorcraft Development Corporation Model UH1P helicopters.
Therefore, the FAA issued Emergency AD 20211552 to address the unsafe condition on these helicopters.
Emergency AD 20211552 requires removing the affected pins from service and prohibits installing those pins on any helicopter. The FAA sent the emergency AD to all known U.S. owners and operators of these helicopters.
FAAs Determination The FAA is issuing this AD because the agency evaluated all the relevant information and determined the unsafe condition described previously is likely to exist or develop in other products of these same type designs.

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