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Federal Register / Vol. 86, No. 43 / Monday, March 8, 2021 / Rules and Regulations
develop on other products of the same type design and that air safety and the public interest require adopting the AD
requirements as proposed with the changes described previously. These changes are consistent with the intent proposed in the SNPRM for correcting the unsafe condition and will neither increase the economic burden on any operator nor increase the scope of the AD.
Related Service Information Under 1
CFR Part 51
The FAA reviewed KI235. This service information provides instructions for installing the newly designed yoke assembly, P/N D2245.
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.

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Related Service Information The FAA has reviewed SB14, which specifies installing a temperature recorder on the T/R drive shaft forward hanger bearing assembly and inspecting the temperature during preflight checks and during each 100-hour inspection. If the temperature of the bearing is found running hot, then Robinson advises upgrading the bearing to a newer design kit P/N KI235. This service information also specifies adding a caution page to the Pilot Operating Handbook regarding the overheating bearing assemblies. This service information was superseded by SB20.
The FAA has reviewed SB20, SB
20A, and SB20B, which specify upgrading the forward hangar bearing assembly of certain T/R drive shaft assemblies to the newer design with kit P/N KI235 if not previously done. For certain installations, this service information contains procedures for inspecting for sealant and applying sealant to the damper and hanger bearings if needed to prevent seal rotation. This service information also specifies removing the caution page from the Pilot Operating Handbook regarding the overheating bearing assemblies that was added by SB14.
Differences Between This AD and the Service Information SB20 specifies replacing the yoke assembly and applying sealant to the bearing seals within the next 100 flight hours or by January 31, 2017, whichever comes first, and SB20A and SB20B
continue the compliance time of no later than January 31, 2017. This AD does not have a calendar time compliance requirement. SB20, SB 20A, and SB
20B specify inspecting for sealant and
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applying sealant to the damper and hanger bearings if needed, while this AD does not.
Costs of Compliance The FAA estimates that this AD
affects 290 helicopters of U.S. Registry.
The FAA estimates that operators may incur the following costs in order to comply with this AD. Labor costs are estimated at $85 per work-hour.
Installing Robinson field kit KI235
takes about 6 work-hours and parts cost about $950, for an estimated cost of $1,460 per helicopter. As an option, replacing an affected T/R drive shaft assembly P/N D2243 with T/R drive shaft assembly P/N D2244 takes about 5 work-hours and parts cost about $4,400, for an estimated cost of $4,825
per helicopter.
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 The FAA determined that 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, 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.

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List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
Adoption of the Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:
PART 39AIRWORTHINESS
DIRECTIVES
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:

20210412 Robinson Helicopter Company:
Amendment 3921433; Docket No.
FAA20170682; Product Identifier 2017SW028AD.
a Applicability This airworthiness directive AD applies to Robinson Helicopter Company Robinson Model R66 helicopters, certificated in any category, with a tail rotor T/R drive shaft assembly part number P/N D2243 without B90011 modification installed.
Note 1 to paragraph a: Helicopters with serial number S/N 0631 and subsequent had T/R drive shaft assembly P/N D2244
installed during production, which is not affected by this AD.
b Unsafe Condition This AD defines the unsafe condition as failure of a T/R drive shaft forward hanger bearing. This condition could result in failure of the T/R drive shaft and subsequent loss of helicopter control.
c Effective Date This AD is effective April 12, 2021.
d Compliance You are responsible for performing each action required by this AD within the specified compliance time unless it has already been accomplished prior to that time.
e Required Actions 1 Within 100 hours time-in-service, do one of the following:
i Install Robinson kit P/N KI235 using KI235 R66 TRDS Forward Yoke Assembly and Hanger Installation Kit Instructions, Revision A, dated June 23, 2015, except where the service information specifies discarding parts, you are required to remove those parts from service instead.
ii Replace the entire T/R drive shaft assembly with T/R drive shaft assembly P/N
D2244.
2 As of the effective date of this AD, do not install a T/R drive shaft assembly P/N
D2243 without B90011 modification on any helicopter.

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