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Federal Register / Vol. 86, No. 150 / Monday, August 9, 2021 / Proposed Rules
24, 2017 EASA AD 20170039, which retained the requirements of EASA AD
20160033 and required replacing the affected cooling fans with the newly designed cooling fan which terminates the repetitive inspections from EASA
AD 20160033.
Since EASA issued EASA AD 2017
0039, HG issued a revision to its service bulletin requiring a life limit requirement for the replacement of the affected cooling fans. Accordingly, EASA superseded EASA AD 20170039
with EASA AD 20190187, dated July 31, 2019, and corrected August 2, 2019
EASA AD 20190187. EASA AD 2019
0187 retains some of the requirements in EASA AD 20170039 and requires a new compliance time and life limit for the replacement of the affected part.
EASA AD 20190187 also removes the modification and inspection requirements which are covered by EASA AD 20190025, dated February 4, 2019.
The unsafe condition described in the EASA ADs, if not addressed, could result in failure of the cooling fan and subsequent engine in-flight shut-down and reduced control of the helicopter.

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FAAs Determination These helicopters have been approved by EASA and are approved for operation in the United States. Pursuant to the FAAs bilateral agreement with the European Union, EASA has notified the FAA about the unsafe condition described in its AD. The FAA is proposing this AD after evaluating all known relevant information and determining that the unsafe condition described previously is likely to exist or develop on other helicopters of the same type designs.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Guimbal Service Bulletin SB 16021, Revision E, dated August 27, 2019. This service information specifies instructions for retrofitting the cooling fan with the new front flange, aft ring, and 24-hole pulley.
This service information also specifies that upon completion of all the required actions, the cooling fan assembly P/N
G5200000, P/N G5200001 and P/N
G5204100 become P/N G5204101.
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 Guimbal Service Bulletin SB 16021, Revision D, dated May 20, 2019, which is not
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incorporated by reference, and which specifies procedures for accessing the cooling fan and removing it from service; modifying, applying adhesive and torqueing the rear flange; installing the improved cooling fan, and additional actions.
Proposed AD Requirements in This NPRM
This proposed AD would require removing from service any affected partnumbered cooling fan. An alternative, for certain part-numbered cooling fans, modifying the cooling fan before it exceeds a certain total hours TIS.
Differences Between This Proposed AD
and EASA AD 20190187
EASA AD 20190187 allows certain cooling fans with certain total hours TIS
to be retrofitted before exceeding their life limit, whereas this proposed AD
would require removing these cooling fans from service or as an alternate to removing them from service, modifying the cooling fan before exceeding the total hours TIS. EASA AD 20190187
allows a compliance time in months TIS
to replace certain part-numbered cooling fans, whereas this proposed AD
would only allow hours TIS.
EASA AD 20190187 retains the compliance time of March 10, 2017, which is the effective date of EASA AD
20170039. This proposed AD would require compliance within the effective date of this AD. The FAA has determined that these compliance times are adequate to address the identified unsafe condition.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 32
helicopters of U.S. Registry. Labor rates are estimated at $85 per work-hour.
Based on these numbers, the FAA
estimates the following costs to comply with this proposed AD.
Removing the affected cooling fan from service and installing the newly designed cooling fan would take about 16 work-hours and parts would cost about $4,600 for an estimated cost of $5,960 per replacement and $190,720
for the U.S. fleet.
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
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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 proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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 this proposed regulation:
1 Is not a significant regulatory action under Executive Order 12866, 2 Would not affect intrastate aviation in Alaska, and 3 Would not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
The Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 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:

Helicopteres Guimbal: Docket No. FAA
20210620; Project Identifier 2019SW
074AD.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by September 23, 2021.
b Affected ADs None.

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