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Federal Register / Vol. 86, No. 153 / Thursday, August 12, 2021 / Proposed Rules The FAA estimates the following costs to do any necessary replacement that would be required based on the
results of the proposed inspection. The agency has no way of determining the
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number of aircraft that might need this replacement:

ON-CONDITION COSTS
Action
Labor cost
Replace TGB radial gearshaft

60 work-hours $85 per hour = $5,100

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
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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.
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,
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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
20210567; Project Identifier AD2021
00663E.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by September 27, 2021.
b Affected ADs None.
c Applicability This AD applies to General Electric Company GE GE9076B, GE9085B, GE90
90B, GE9094B, GE90110B1, and GE90
115B model turbofan engines with a transfer gearbox TGB radial bevel gear TGB radial gearshaft serial number listed in paragraph 4., APPENDIXA, Table 1 of GE GE90
Service Bulletin SB 721201 R01, dated April 28, 2021 GE90 SB 721201 R01 or paragraph 4., APPENDIXA, Table 1 of GE
GE90100 SB 720857 R01, dated April 28, 2021 GE90100 SB 720857 R01.
d Subject Joint Aircraft System Component JASC
Code 7260, Turbine Engine Accessory Drive.
e Unsafe Condition This AD was prompted by two separate inflight shutdowns resulting from the failure of the TGB radial gearshaft. The FAA is issuing this AD to prevent failure of the TGB radial gearshaft. The unsafe condition, if not addressed, could result in failure of one or more engines, loss of thrust control, and damage to the aircraft.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Required Actions 1 At the next engine shop visit after the effective date of this AD, perform a visual inspection of the affected TGB radial
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Parts cost $24,520

Cost per product $29,620

gearshaft using the Accomplishment Instructions, paragraph 3.A.3a1 through 3, of GE90 SB 721201 R01 or GE90100 SB
720857 R01, as applicable.
2 If, during the visual inspection required by paragraph g1 of this AD, discrepancies are found that meet the criteria in the Accomplishment Instructions, paragraph 3.A.4a or 3.A.4b, of GE90 SB 721201
R01 or GE90100 SB 720857 R01, before further flight, replace the TGB radial gearshaft with a part eligible for installation.
h Definitions 1 For the purpose of this AD, an engine shop visit is when the compressor discharge pressure seal joint is disassembled.
2 For the purpose of this AD, a part eligible for installation is a TGB radial gearshaft that does not have raised material or rework on the teeth chamfers as described in the Accomplishment Instructions, paragraph 3.A.4a or 3.A.4b, of GE90 SB
721201 R01 or GE90100 SB 720857 R01.
i Credit for Previous Actions You may take credit for the inspection of the affected TGB radial gearshaft required by paragraph g1 of this AD if you performed the inspection before the effective date of this AD using GE GE90 SB 721201 R00, dated January 5, 2021, or GE GE90100 SB 720857
R00, dated January 5, 2021.
j Alternative Methods of Compliance AMOCs 1 The Manager, ECO Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14
CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the certification office, send it to the attention of the person identified in Related Information. You may email your request to ANE-AD-AMOC@
faa.gov.
2 Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/
certificate holding district office.
k Related Information 1 For more information about this AD, contact Stephen Elwin, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: 781
2387236; fax: 781 2387199; email:
Stephen.L.Elwin@faa.gov.
2 For service information identified in this AD, contact General Electric Company, GE Aviation, Room 285, 1 Neumann Way,
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