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Federal Register / Vol. 86, No. 150 / Monday, August 9, 2021 / Rules and Regulations
Support for the AD
ALPA and Boeing expressed support for the NPRM as written. United Airlines, Inc. stated they had no objections to the NPRM as proposed.
Conclusion The FAA reviewed the relevant data, considered any comments received, and determined that air safety requires adopting this AD as proposed.
Accordingly, the FAA is issuing this AD
to address the unsafe condition on these products. Except for minor editorial changes, and any other changes
described previously, this AD is adopted as proposed in the NPRM.
None of the changes will increase the economic burden on any operator.
Related Service Information Under 1
CFR Part 51
The FAA reviewed General Electric GE90100 Service Bulletin SB 73
0118, Revision 01, dated April 27, 2021.
This SB specifies procedures for replacing the FADEC MN4
microprocessor. This service information is reasonably available because the interested parties have access to it through their normal course
of business or by the means identified in ADDRESSES.
Interim Action The FAA considers this AD to be an interim action. If final action is later identified, the FAA may consider additional rulemaking.
Costs of Compliance The FAA estimates that this AD
affects 311 engines installed on airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS
Action
Labor cost
Remove and replace FADEC

1 work-hour $85 per hour = $85

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

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Parts cost
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:

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

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

20211505 General Electric Company:
Amendment 3921652; Docket No.
FAA20210347; Project Identifier AD
202001610E.
a Effective Date This airworthiness directive AD is effective September 13, 2021.
b Affected ADs None.

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$25,200

Cost per product $25,285

Cost on U.S.
operators $7,863,635

c Applicability This AD applies to General Electric Company GE GE90110B1 and GE90115B
model turbofan engines.
d Subject Joint Aircraft System Component JASC
Code 7600, Engine Controls.
e Unsafe Condition This AD was prompted by an in-service occurrence of loss of engine thrust control resulting in uncommanded high thrust. The FAA is issuing this AD to prevent failure of the full authority digital engine control FADEC integrated circuit MN4
microprocessor solder ball. The unsafe condition, if not addressed, could result in loss of engine thrust control and reduced control of the airplane.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Required Actions 1 Within the following compliance times after the effective date of this AD, replace the FADEC MN4 microprocessor using an approved overhaul procedure:
i For a FADEC MN4 microprocessor with 10,500 or more cycles since new CSN, replace the FADEC MN4 microprocessor before accumulating 500 additional cycles on the FADEC MN4 microprocessor.
ii For a FADEC MN4 microprocessor with 5,000 CSN or more, but fewer than 10,500
CSN, replace the FADEC MN4
microprocessor at the next FADEC
component shop visit or before accumulating 11,000 CSN on the FADEC MN4
microprocessor, whichever occurs first.
2 Thereafter, repeat the replacement of the FADEC MN4 microprocessor at the first FADEC component shop visit after accumulating 5,000 CSN since the last replacement but before accumulating 11,000
CSN since the last replacement.

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