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Federal Register / Vol. 86, No. 221 / Friday, November 19, 2021 / Rules and Regulations
NPRM was prompted by a report that a number of fairleads that support the engine combustion chamber D1 drain hose showed evidence of heat damage.
The NPRM proposed to require modifying the helicopter by installing a certain engine combustion chamber D1
drain assembly, as specified in an EASA
AD.
The FAA is issuing this AD to address heat damage of the engine combustion chamber D1 drain hose, which in a case where the right-hand engine is operated in the one engine inoperative OEI
rating, the D1 drain pipe could transfer so much heat to the nearby fuel system vent pipe that its internal surface temperature could exceed the autoignition temperature for fuel. The unsafe condition, if not addressed, could result in undetected fire ignition in the fuel tank bay with consequent loss of the
helicopter. See the MCAI for additional background information.
Comments The FAA gave the public the opportunity to participate in developing this final rule. The FAA received no comments on the NPRM or on the determination of the cost to the public.
Conclusion The FAA reviewed the relevant data and determined that air safety and the public interest require adopting this final rule as proposed, except for minor editorial changes. The FAA has determined that these minor changes:
Are consistent with the intent that was proposed in the NPRM for addressing the unsafe condition; and
Do not add any additional burden upon the public than was already proposed in the NPRM.
Related Service Information Under 1
CFR Part 51
EASA AD 20190039 requires modifying the helicopter by installing the engine combustion chamber D1
drain assembly, part number 8G7170P00111.
This material 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.
Costs of Compliance The FAA estimates that this AD
affects 4 helicopters of U.S. registry. The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS
Action
Labor cost
Modification

4 work-hours $85 per hour = $340

The FAA has included all known costs in its cost estimate. According to the manufacturer, however, some or all of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected operators.

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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.

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.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
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:

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

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
VerDate Sep<11>2014

21:40 Nov 18, 2021

Parts cost
Jkt 256001

39.13

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

PO 00000

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Fmt 4700

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Cost per product
$2,557

$2,897

Cost on U.S.
operators $11,588

20212209 Leonardo S.p.a.: Amendment 3921782; Docket No. FAA20210687;
Project Identifier 2019SW029AD.
a Effective Date This airworthiness directive AD is effective December 27, 2021.
b Affected ADs None.
c Applicability This AD applies to Leonardo S.p.a. Model AW189 helicopters, certificated in any category, as identified in European Union Aviation Safety Agency EASA AD 2019
0039, dated February 20, 2019 EASA AD
20190039.
d Subject Joint Aircraft Service Component JASC
Code: 7170, Engine Drains.
e Unsafe Condition This AD was prompted by a report that a number of fairleads that support the engine combustion chamber D1 drain hose showed evidence of heat damage. The FAA is issuing this AD to address such heat damage, which in a case where the right-hand engine is operated in the one engine inoperative OEI
rating, the D1 drain pipe could transfer so much heat to the nearby fuel system vent pipe that its internal surface temperature could exceed the auto-ignition temperature for fuel. The unsafe condition, if not addressed, could result in undetected fire ignition in the fuel tank bay with consequent loss of the helicopter.

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