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Federal Register / Vol. 86, No. 101 / Thursday, May 27, 2021 / Rules and Regulations
28475

ESTIMATED COSTS
Action
Labor cost
Parts cost
Cost per product
Cost on U.S.
operators
Creating history card; determining type of IFWU assembly;
inspecting IFWU assemblies; recording information; replacing parts; and marking certain parts.

Up to 8 work-hours $85 per hour = $680.

Up to $1,975 ..

Up to $2,655 ..

Up to $146,025.

Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. Subtitle VII:
Aviation Programs, describes in more detail the scope of the Agencys authority.
The FAA is issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701: General requirements. Under that section, Congress charges the FAA
with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce.
This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.
Regulatory Findings This AD will not have federalism implications under Executive Order 13132. This AD will not have a substantial direct effect on the States, on the relationship between the national government and the States, or on the distribution of power and responsibilities among the various levels of government.
For the reasons discussed above, I
certify that this AD:
1 Is not a significant regulatory action under Executive Order 12866, 2 Will not affect intrastate aviation in Alaska, and 3 Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.

1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

20211016 Carson Helicopters, Inc.;
Croman Corporation; Sikorsky Aircraft Corporation; and Siller Helicopters:
Amendment 3921549; Docket No.
FAA200626107; Project Identifier 2004SW30AD.
a Effective Date This airworthiness directive AD is effective July 1, 2021.
b Affected ADs None.
c Applicability This AD applies to all helicopters identified in paragraphs c1 through 6 of this AD, certificated in any category including restricted.
1 Carson Helicopters, Inc., Model S61L
helicopters.
2 Carson Helicopters, Inc., Model SH3H
helicopters.
3 Croman Corporation Model SH3H
helicopters.
4 Sikorsky Aircraft Corporation Model S61A, S61D, S61E, and S61V
helicopters.
5 Siller Helicopters Model CH3E
helicopters.
6 Siller Helicopters Model SH3A
helicopters.
d Subject Joint Aircraft System Component JASC
Code 6310, Engine/Transmission Coupling.

The Amendment
e Unsafe Condition This AD was prompted by an accident in which the left and right input freewheel unit IFWU assembly on a helicopter slipped or disengaged, resulting in both engines overspeeding, engine shutdowns, and loss of engine power to the transmissions. The FAA
is issuing this AD to address slipping of the main gearbox IFWU assembly, loss of engine power, and subsequent loss of control of the helicopter.

Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:

f Compliance Comply with this AD within the compliance times specified, unless already done.

List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
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PART 39AIRWORTHINESS
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g Creation of History Card or Equivalent and Daily Actions Within 10 hours time-in-service TIS after the effective date of this AD, do the actions specified in paragraphs g1 and 2 of this AD.
1 Create an external lift component history card or equivalent record for each IFWU assembly, part number P/N 61074
35000041 through 6107435000063
inclusive.
2 Count and, at the end of each days operations, record the number of external lift cycles lift cycles performed and the hours TIS for each IFWU assembly, P/N 61074
35000041 through 6107435000063
inclusive. A lift cycle is defined as the lifting of an external load and subsequent release of the load. Record the lift cycles and hours TIS on the external lift component history card or equivalent record.
h Determination of IFWU Assembly Type and Calculations 1 Upon reaching 250 hours TIS after the effective date of this AD on each IFWU
assembly, P/N 6107435000041 through 6107435000063 inclusive, determine whether the IFWU assembly is a repetitive external lift REL or non-REL IFWU
assembly by using a 250-hour TIS moving average. To perform the calculation, divide the total number of lift cycles performed during the first 250 hours TIS by 250. The result will be the first moving average calculation of lift cycles per hour TIS.
i If the calculation specified in paragraph h1 of this AD results in more than 6 lift cycles per hour TIS, the IFWU assembly is an REL IFWU assembly.
ii If the calculation specified in paragraph h1 of this AD results in 6 or less lift cycles per hour TIS, the IFWU assembly is a NonREL IFWU assembly.
2 For each IFWU assembly determined to be a Non-REL IFWU assembly based on the first calculation of the 250-hour TIS moving average for lift cycles specified in paragraph h1 of this AD: Within 50 hours TIS after the determination, and thereafter at intervals of 50 hours TIS, recalculate the average lift cycles per hour TIS to determine whether the IFWU assembly is an REL or non-REL IFWU
assembly. To perform the calculation, subtract the total number of lift cycles performed during the first 50-hour TIS
interval used in the previous moving average calculation from the total number of lift cycles performed on the IFWU assembly during the previous 300 hours TIS. Divide this result by 250. The result will be the next or subsequent moving average calculation of lift cycles per hour TIS.
i If any calculation specified in paragraph h2 of this AD results in more than 6 lift
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