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Federal Register / Vol. 86, No. 161 / Tuesday, August 24, 2021 / Proposed Rules FOIA 5 U.S.C. 552, CBI is exempt from public disclosure. If your comments responsive to this NPRM
contain commercial or financial information that is customarily treated as private, that you actually treat as private, and that is relevant or responsive to this NPRM, it is important that you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI
as PROPIN. The FAA will treat such marked submissions as confidential under the FOIA, and they will not be placed in the public docket of this NPRM. Submissions containing CBI
should be sent to Scott Stevenson, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803. Any commentary that the FAA receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.
Background The FAA received reports of several IFSDs and UERs on airplanes operating with GE CF3410E5, CF3410E5A1, CF3410E6, and CF3410E7 model turbofan engines. After investigation, the manufacturer determined that the failures were the result of Teflon oil
seals disbonding from the aluminum housing when used with either high thermal stability HTS or high performance capability HPC oils. The stationary oil seal deterioration resulted from the failure of the bonding adhesive, known as EA9658, which does not have the high temperature capabilities as designed and is negatively impacted by the use of HTS
or HPC oils. This deterioration results in Teflon particles collecting in the strainer assembly. The manufacturer determined that CF3410E2A1, CF34
10E6A1, and CF3410E7B model turbofan engines are also subject to this unsafe condition. This condition, if not addressed, could result in failure of the engine, in-flight shutdown, and loss of control of the airplane.
FAAs Determination The FAA is issuing this NPRM after determining that the unsafe condition described previously is likely to exist or develop on other products of the same type design.
Related Service Information Under 1
CFR Part 51
The FAA reviewed GE CF3410E
Service Bulletin 720365 R04, dated
April 27, 2021. This service information specifies procedures for performing a visual inspection and a borescope inspection of the strainer assembly for Teflon particles. 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.
Proposed AD Requirements in This NPRM
This proposed AD would require initial and repetitive visual inspections of the strainer assembly screen. As a terminating action to the repetitive visual inspections, this proposed AD
would require the replacement of the stationary oil seal at the No. 1 forward bearing.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 46
engines installed on airplanes of U.S.
registry.
The FAA estimates the following costs to comply with this proposed AD:

lotter on DSK11XQN23PROD with PROPOSALS1

ESTIMATED COSTS
Cost per product
Parts cost
Cost on U.S.
operators
Action
Labor cost
Inspect the strainer assembly screen.
Replace the stationary oil seal
1 work-hour $85 per hour = $85

$0

$85

$3,910

2 work-hours $85 per hour = $170

8,628

8,798

404,708

Authority for This Rulemaking
Regulatory Findings
List of Subjects in 14 CFR Part 39

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.

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, 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.

Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

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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

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

General Electric Company: Docket No. FAA
20210699; Project Identifier AD2020
01685E.

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