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Federal Register / Vol. 86, No. 47 / Friday, March 12, 2021 / Proposed Rules 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.

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

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 above, I
certify this proposed regulation:
1 Is not a significant regulatory action under Executive Order 12866,
Amended
2. The FAA amends 39.13 by:
a. Removing Airworthiness Directive 20140406, Amendment 3917764 79
FR 9990, February 24, 2014, and b. Adding the following new airworthiness directive:

Safran Helicopter Engines, S.A. Type Certificate previously held by Turbomeca, S.A.: Docket No. FAA
20210137; Project Identifier MCAI
202000269E.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD action by April 26, 2021.

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b Affected ADs This AD replaces AD 20140406, Amendment 3917764 79 FR 9990, February 24, 2014.
c Applicability This AD applies to Safran Helicopter Engines, S.A. Type Certificate previously held by Turbomeca, S.A. Arrius 2B1, 2B1A, 2B2, and 2K1 model turboshaft engines.
d Subject Joint Aircraft System Component JASC
Code 7320Fuel Controlling System.
e Unsafe Condition This AD was prompted by in-flight shutdowns caused by interrupted fuel supply at the hydro-mechanical metering unit HMU. The FAA is issuing this AD to prevent interrupted fuel supply at the HMU.
The unsafe condition, if not addressed, could result in engine in-flight shutdown, forced landing of the helicopter, damage to the helicopter and injury to occupants.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Required Actions 1 Within the compliance time specified in Table 1 to paragraph g1 of this AD, as applicable, and before re-installation of the HMU after each removal from the engine, visually inspect the drive gear shaft splines of the high pressure pump, and clean and inspect the sleeve assembly splines in accordance with paragraphs 2.4.2 and 2.4.3, or 4.4.2 and 4.4.3, as applicable, of Safran Helicopter Engines Mandatory Service Bulletin MSB 319 73 2825, Version J, dated March 15, 2019.

TABLE 1 TO PARAGRAPH g1
HMU group/condition
Compliance time
Group 1/150 HMU operating hours or more accumulated since new or since last overhaul..
Group 1/Less than 150 HMU operating hours accumulated since new or since last overhaul..
Group 2

2 Repeat the inspection required by paragraph g1 of this AD at intervals not to exceed 500 HMU operating hours since the previous inspection.
Note 1 to paragraph g2: A noncumulative tolerance of 10% of HMU
operating hours hrs may be applied to the timing of each repetitive inspection, with a maximum allowable tolerance of +50 HMU
operating hrs. For example, counting from the initial inspection, the repeat inspections would occur at the following times, with the tolerance noted in parentheses; 500 HMU
operating hrs +50 hrs, 1000 HMU operating hrs +50 hrs, 1500 HMU operating hrs +50
hrs.

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Within 50 HMU operating hours after the effective date of this AD.
Before exceeding 200 HMU operating hours after the effective date of this AD.
Within 500 HMU operating hours since the last inspection or since first installation of the HMU.

3 If a rejectable indication is found during any inspection required by paragraphs g1
or 2 of this AD, replace the sleeve assembly on the affected high-pressure pump drive gear shaft or replace the affected HMU in accordance with paragraph 2.4.2 or 4.4.2 of the MSB.

accordance with Safran Helicopter Engines MSB 319 73 2825 version G or later.

h Definitions 1 A Group 1 HMU is an HMU that was first installed on or before January 31, 2013, and that has not previously been inspected in accordance with Safran Helicopter Engines MSB 319 73 2825 version G or later.
2 A Group 2 HMU is an HMU that was first installed after January 31, 2013, or a HMU that has previously been inspected in
j Credit for Previous Actions You may take credit for any initial inspection or replacement of an HMU or the sleeve assembly on the affected high-pressure pump drive gear shaft required by paragraph g of this AD if you performed the inspection or replacement in accordance with Safran Helicopter Engines MSB 319 73 2825, version G, dated January 24, 2013; version H, dated
PO 00000

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i No Reporting Requirement The reporting requirements specified in the Accomplishment Instructions, paragraph 2.4.2, of the MSB are not required by this AD.

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