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Federal Register / Vol. 86, No. 101 / Thursday, May 27, 2021 / Rules and Regulations
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of July 1, 2021.
ADDRESSES: For service information identified in this final rule, contact your local Sikorsky Field Representative or Sikorskys Service Engineering Group at Sikorsky Aircraft Corporation, 124
Quarry Road, Trumbull, CT 06611;
telephone 1800-Winged-S; email wcs_
cust_service_eng.gr-sik@lmco.com.
Operators may also log on to the Sikorsky 360 website at https
www.sikorsky360.com. 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. It is also available at https www.regulations.gov by searching for and locating Docket No.
FAA200626107.

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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.
FAA200626107; 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, any comments received, and other information. The address for Docket Operations is U.S.
Department of Transportation, Docket Operations, M30, West Building Ground Floor, Room W12140, 1200
New Jersey Avenue SE, Washington, DC
20590.
FOR FURTHER INFORMATION CONTACT:
Isabel Saltzman, Aviation Safety Engineer, Boston ACO Branch, FAA, 1200 District Avenue, Burlington, MA
01803; telephone 7812387649; email Isabel.L.Saltzman@faa.gov.
SUPPLEMENTARY INFORMATION:
Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to all Sikorsky Aircraft Corporation Model S61 A, D, E, and V
helicopters; Croman Corporation Model SH3H helicopters, Carson Helicopters, Inc. Model S61L helicopters; and Siller Helicopters Model CH3E and SH3A
helicopters. The NPRM published in the Federal Register on October 30, 2006
71 FR 63272. The NPRM was prompted by an accident in which the left and right IFWU assembly on a helicopter slipped or disengaged resulting in both engines overspeeding,
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engine shutdowns, and loss of engine power to the transmissions. In the NPRM, the FAA proposed to require creating a component history card or equivalent record and recording the hours TIS and the lift cycles for each affected main gearbox left and right IFWU assembly. The NPRM also proposed to require determining if the IFWU assembly is a repetitive external lift REL or non-REL IFWU assembly.
The determination includes calculating a moving average of lift cycles per hour TIS at specified intervals on each IFWU
assembly. For REL IFWU assemblies, the NPRM proposed to require repetitive inspections, which include visual and dimensional inspections, of the IFWU
assembly for wear, surface distress, and endplay, recording certain information, and replacing affected parts with an airworthy part. In addition, the NPRM
proposed to require permanently marking the REL IFWU camshafts and gear housings with the letters REL on the surface of these parts.
The FAA issued a supplemental notice of proposed rulemaking SNPRM
to amend 14 CFR part 39 by adding an AD that would apply to all Carson Helicopters, Inc., Model S61L and SH3H helicopters; Croman Corporation Model SH3H helicopters; Sikorsky Aircraft Corporation Model S61A, S61D, S61E, and S61V helicopters;
and Siller Helicopters Model CH3E
and SH3A helicopters. The SNPRM
published in the Federal Register on March 15, 2021 86 FR 14285. The SNPRM was prompted by a determination that additional camshaft and gear housing part numbers need to be marked and the applicability and certain compliance times need clarification. The SNPRM proposed to require the same actions specified in the NPRM. The SNPRM also proposed to mark additional camshaft and gear housing part numbers. Additionally, the SNPRM clarified the applicability and certain compliance times. The FAA is issuing this AD to address the unsafe condition on these products.
Discussion of Final Airworthiness Directive Comments The FAA received comments from one commenter. The commenter was Croman Corp. The commenter supported the SNPRM without change.
Conclusion The FAA reviewed the relevant data, considered the comments received, and determined that air safety requires adopting the AD as proposed.

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Accordingly, the FAA is issuing this AD
to address the unsafe condition on these products. Except for minor editorial changes, this AD is adopted as proposed in the SNPRM.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Sikorsky Aircraft Corporation Alert Service Bulletin 61B3567B, Revision B, dated August 11, 2003. This service information specifies, among other actions, procedures for inspections, which includes visual and dimensional inspections, of the IFWU assembly for wear, surface distress, and endplay, and for recording certain information. 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.
Other Related Service Information The FAA also reviewed Sikorsky Aircraft Corporation All Operators Letter AOL CCS61AOL040005, dated May 18, 2004. This service information provides an example and additional information about tracking cycles and the moving average procedure.
The FAA also reviewed Sikorsky Aircraft S61L/N Overhaul Manual, SA404583, Revision 20, dated August 15, 2003, as revised by Temporary Revisions 65193, 194, 195, and 196, which contains the overhaul procedures for the IFWU assembly.
Differences Between This AD and the Service Information The effectivity of Sikorsky Aircraft Corporation Alert Service Bulletin 61B3567B, Revision B, dated August 11, 2003, includes Model S61 L, N, NM, and R helicopters. However, for those helicopters, the unsafe condition is addressed in AD 20070105, Amendment 3914876 72 FR 1139, January 10, 2007. Therefore, those helicopters are not included in the applicability of this AD.
Sikorsky Aircraft Corporation Alert Service Bulletin 61B3567B, Revision B, dated August 11, 2003, specifies contacting Sikorsky and providing information to Sikorsky. This AD does not require you to contact Sikorsky or provide information to Sikorsky.
Costs of Compliance The FAA estimates that this AD
affects 55 helicopters of U.S. registry.
The FAA estimates the following costs to comply with this AD:

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