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Federal Register / Vol. 86, No. 160 / Monday, August 23, 2021 / Proposed Rules
Proposed AD Requirements in This NPRM
This proposed AD would require, before further flight after the effective date of this AD, removing from service certain part-numbered cooling fan front flanges and engine pulley ball bearings that have accumulated or exceeded their life limit. This proposed AD would also require establishing recurring CMR tasks for certain part-numbered cooling fan front flanges. Depending on the results of the CMR tasks, this proposed AD
would also require corrective action.
Additionally, this proposed AD would require painting certain part-numbered tail booms with glossy white paint.

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Differences Between This Proposed AD
and EASA AD 20190025
EASA AD 20190025 requires contacting Helicopteres Guimbal for corrective actions when a discrepancy is found, whereas this proposed AD would require removing the part from service.
EASA AD 20190025 requires accomplishing the actions specified in MM J70002 Issue 06, whereas this proposed AD would require establishing a life limit for certain part-numbered cooling fan front flanges and certain part-numbered engine pulley ball bearings and removing any part from service accordingly instead. EASA AD
20190025 requires revising the AMP
with the actions specified in MM J70
002 Issue 06, whereas the proposed AD
would not.
Costs of Compliance The FAA estimates that this proposed AD would affect 32 helicopters of U.S.
Registry. The FAA estimates that operators may incur the following costs in order to comply with this proposed AD. Labor costs are estimated at $85 per work-hour.
Replacing a cooling fan front flange would take about 16 work-hours and parts would cost about $4,500 for an estimated cost of $5,860 per helicopter and $187,520 for the U.S. fleet, per replacement cycle.
Replacing an engine pulley ball bearing would take about 12 work-hours and parts would cost about $250 for an estimated cost of $1,270 per helicopter and $40,640 for the U.S. fleet, per replacement cycle.
The FAA has no way of determining the estimated costs to do allowable repairs based on the results of the CMR
tasks. If required, replacing a cracked cooling fan front flange would take about 16 work-hours and parts would cost about $4,500 for an estimated cost of $5,860.
The FAA has included all known costs in its cost estimate. According to
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the manufacturer, however, some of the costs of this proposed AD may be covered under warranty, thereby reducing the cost impact on affected operators.
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 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:

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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
20210688; Project Identifier 2019SW
025AD.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by October 7, 2021.
b Affected ADs None.
c Applicability This AD applies to Helicopteres Guimbal HG Model Cabri G2 helicopters, certificated in any category.
d Subject Joint Aircraft Service Component JASC
Code: 7100, Powerplant System.
e Unsafe Condition This AD was prompted by a notification of certain parts remaining in service beyond their fatigue life or beyond maintenance intervals required by the certification maintenance requirements CMRs of the Instructions for Continued Airworthiness.
The FAA is issuing this AD to prevent failure of a part, which could result in loss of control of the helicopter.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Required Actions 1 Before further flight after the effective date of this AD, remove from service any part that has reached or exceeded its life limit, as specified in paragraphs g1i through iii of this AD, and thereafter remove from service any part on or before each part reaches its life limit:
i The life limit for cooling fan front flange part number P/N G5202200 mounted on pulley 12 screws P/N G5210100 or G52
10101; and cooling fan front flange P/N
G5202201 mounted or having been mounted on pulley 12 screws P/N G5210
100 or G5210101, installed on cooling fan P/N G5200001 or G5200002; is 2,200
total hours time-in-service TIS.
ii The life limit for cooling fan front flange P/N G5202201 mounted on pulley 24 screws P/N G5210102 and having never been mounted on pulley 12 screws P/
N G5210100 or G5210101, installed on cooling fan P/N G5200001 or G5200002, is 4,400 total hours TIS.
iii The life limit for engine pulley ball bearing P/N HG610790 and HG611944, installed on engine pulley assembly P/N
G51141XX, is 2,200 total hours TIS.
2 Perform the following CMR tasks as follows:
i Cooling fan front flange P/N G5202
200 mounted on pulley 12 screws P/N G52
10100 or G5210101; and cooling fan front
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