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Federal Register / Vol. 86, No. 35 / Wednesday, February 24, 2021 / Rules and Regulations Costs of Compliance
course of business or by the means identified in ADDRESSES.

The FAA estimates that this AD
affects 555 engines installed on airplanes of U.S. registry.

11115

The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS
Action
Labor cost
Shim check
Protrusion check/pull-out test

1 work-hour $85 per hour = $85
4 work-hours $85 per hour = $340

The FAA estimates the following costs to do any necessary replacements
Cost per product
Parts cost
that are required based on the results of the shim check. The agency has no way
$0
0

$85
340

Cost on U.S.
operators $47,175
188,700

of determining the number of aircraft that might need these replacements:

ON-CONDITION COSTS
Action
Labor cost
Replace HMU/MEC idler adapter insert

4 work-hours $85 per hour = $340

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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.
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
VerDate Sep<11>2014

16:14 Feb 23, 2021

Jkt 253001

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:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

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

20210302 General Electric Company:
Amendment 3921405; Docket No.
FAA20200371; Project Identifier AD
201900124E.
a Effective Date This airworthiness directive AD is effective March 31, 2021.
b Affected ADs None.
c Applicability This AD applies to General Electric Company GE CF680C2A1, CF680C2A2, CF680C2A3, CF680C2A5, CF680C2A5F, CF680C2A8, CF680C2B1, CF680C2B1F, CF680C2B2, CF680C2B2F, CF680C2B4, CF680C2B4F, CF680C2B5F, CF680C2B6, CF680C2B6F, CF680C2B6FA, CF6
80C2B7F, CF680C2B8F, and CF680C2D1F
model turbofan engines that underwent an
PO 00000

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Fmt 4700

Sfmt 4700

Parts cost $50

Cost per product $390

engine shop visit before November 1, 2018, and with accessory gearbox AGB adapter hydromechanical unit HMU/main engine control MEC idler adapter with part number P/N 9395M78G01, P/N 9395M78G02, P/N
9395M78G04, P/N 9395M78G05, P/N
9395M78G08, or P/N 9395M78G10, installed.
d Subject Joint Aircraft System Component JASC
Code 7321, Fuel Control/Turbine Engines.
e Unsafe Condition This AD was prompted by failure of the HMU/MEC on the AGB assembly. The FAA
is issuing this AD to prevent failure of the HMU/MEC. The unsafe condition, if not addressed, could result in engine fire and damage to the airplane.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Required Actions 1 Perform a shim check of the HMU/MEC
idler adapter inserts using paragraph 3.B.1
of GE CF680C2 Service Bulletin SB 72
1577 R01, dated August 16, 2019 the SB, within 1,200 flight hours FHs after the effective date of this AD.
2 Thereafter, perform a repetitive shim check of the HMU/MEC idler adapter inserts using paragraph 3.B.1 of the SB within every 1,200 FHs since the last shim check.
3 If any HMU/MEC idler adapter insert fails the shim check required by paragraph g1 or 2 of this AD, perform the following before further flight:
i Retorque the bolts at each bolt location that failed the shim check using paragraph 3.B.1c of the SB.
ii Perform the shim check again using paragraph 3.B.1b of the SB. If the shim check fails, perform the terminating action required by paragraph h of this AD.

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