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Federal Register / Vol. 86, No. 111 / Friday, June 11, 2021 / Rules and Regulations
The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to certain Airbus SAS Model A330200, A330300, A340200, A340
300, A340500, and A340600 series airplanes. The NPRM published in the Federal Register on March 11, 2021 86
FR 13836. The NPRM was prompted by reports that, for certain LDMCR units, the connection of a certain halon outlet tube to the outlet of a certain fire extinguisher bottle may be incorrect.
The NPRM proposed to require replacing each affected halon outlet tube with a flexible hose, as specified in EASA AD 20200255.
The FAA is issuing this AD to address the possible incorrect connection of the halon outlet tube as described previously, which, in case of a fire inside the LDMCR, could lead to disconnection of the tube, possibly resulting in reduced concentration of
fire suppressing agent at any location inside the LDMCR. See the MCAI for additional background information.

Do not add any additional burden upon the public than was already proposed in the NPRM.

Comments
Related Service Information Under 1
CFR Part 51

The FAA gave the public the opportunity to participate in developing this final rule. The FAA has considered the comment received. The Air Line Pilots Association, International ALPA, stated that it supports the NPRM.
Conclusion The FAA reviewed the relevant data, considered the comment received, 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
EASA AD 20200255 describes procedures for replacing each affected halon outlet tube in the LDMCR with a flexible hose. 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 123 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS FOR REQUIRED ACTIONS
Labor cost
Parts cost
Cost per product
Cost on U.S. operators
4 work-hours $85 per hour = $340

$

$340

$41,820

The FAA has received no definitive data on which to base the parts cost estimates for the replacements specified in this AD.

According to the manufacturer, some or all of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected operators. The FAA does not control warranty coverage for affected operators.
As a result, the FAA has included all known costs in the cost estimate.

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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.

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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.
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:

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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:

20211120 Airbus SAS: Amendment 39
21582; Docket No. FAA20210140;
Project Identifier MCAI202001531T.
a Effective Date This airworthiness directive AD is effective July 16, 2021.
b Affected ADs None.
c Applicability This AD applies to the Airbus SAS
airplanes specified in paragraphs c1
through 6 of this AD, certificated in any category, as identified in European Union Aviation Safety Agency EASA AD 2020
0255, dated November 13, 2020 EASA AD
20200255.
1 Model A330201, 202, 203, 223, and 243 airplanes.
2 Model A330301, 302, 303, 321, 322, 323, 341, 342, and 343 airplanes.
3 Model A340211, 212, and 213
airplanes.
4 Model A340311, 312, and 313
airplanes.

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