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Federal Register / Vol. 86, No. 178 / Friday, September 17, 2021 / Rules and Regulations
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.

20211813 General Electric Company:
Amendment 3921714; Docket No.
FAA20190919; Project Identifier 2019NE24AD.

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 under the criteria of the Regulatory Flexibility Act.

e Unsafe Condition This AD was prompted by two in-flight engine shutdowns IFSDs that occurred as a result of failures of the combustion outer liner shell. The FAA is issuing this AD to prevent failure of the combustion outer liner shell. The unsafe condition, if not addressed, could result in burn-through of the lowpressure turbine case, engine fire, and damage to the airplane.

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:

VerDate Sep<11>2014

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a Effective Date This airworthiness directive AD is effective October 22, 2021.
b Affected ADs None.
c Applicability This AD applies to General Electric Company GE CF348C1, CF348C5, CF34
8C5A1, CF348C5B1, CF348C5A2, CF34
8C5A3, CF348E2, CF348E2A1, CF348E5, CF348E5A1, CF348E5A2, CF348E6, and CF348E6A1 model turbofan engines with an outer shell combustion liner combustion outer liner shell, part number P/N
4124T04G04, P/N 4124T04G05, or P/N
5159T35G02, installed.
d Subject Joint Aircraft System Component JASC
Code 7240, Turbine Engine Combustion Section.

f Compliance Comply with this AD within the compliance times specified, unless already done.
g Required Actions 1 For an affected engine with a combustion outer liner shell that on the effective date of this AD has accumulated 17,500 flight hours FHs or greater time since new TSN, or time since repair TSR, perform an initial borescope inspection BSI
or visual inspection of the combustion outer liner shell for cracks before accumulating 500
engine FHs after the effective date of this AD.
i For GE CF348C engines, inspect using the Accomplishment Instructions, paragraphs 3.A.4 and 3.A.5, of GE CF348C Alert Service Bulletin SB 72A0335 R02, dated February 25, 2020 CF348C Alert SB 72
A0335.
ii For GE CF348E engines, inspect using the Accomplishment Instructions, paragraphs 3.A.4 and 3.A.5, of GE CF348E Alert SB
72A0221 R02, dated February 25, 2020
CF348E Alert SB 72A0221.
Note 1 to paragraph g1: GE has identified the service information as an Alert Service Bulletin, which is stated only in the body of the Alert SB.
2 For an affected engine with a combustion outer liner shell that on the effective date of this AD has accumulated 17,499 FHs or fewer TSN or TSR, before accumulating 500 engine FHs after the combustion outer liner shell has accumulated 17,500 FHs TSN or TSR, perform an initial
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BSI or visual inspection on the combustion outer liner shell for cracks.
i For GE CF348C engines, inspect using the Accomplishment Instructions, paragraphs 3.A.4 and 3.A.5, of CF348C Alert SB 72
A0335.
ii For GE CF348E engines, inspect using the Accomplishment Instructions paragraphs 3.A.4 and 3.A.5, of CF348E Alert SB 72
A0221.
3 For an affected engine with a combustion outer liner shell for which it is not possible to determine the TSN or TSR, use the engine FHs since new to determine when to perform the initial BSI or visual inspection.
4 After the effective date of this AD, and after the initial inspection required by paragraph g1 or 2 of this AD, re-inspect or remove the combustion outer liner shell using inspection criteria as follows:
i For GE CF348C engines, use Table 1 of CF348C Alert SB 72A0335.
ii For GE CF348E engines, use Table 1
of CF348E Alert SB 72A0221.
h Installation Prohibition After the effective date of this AD, do not install a combustion outer liner shell with greater than 17,500 FHs TSN or TSR without first inspecting the combustion outer liner shell in accordance with paragraph g1 of this AD.
i Definition For the purpose of this AD, time since repair TSR is the amount of FHs accumulated on the combustion outer liner shell since performing GEK 105091 or GEK
112031, 724406, REPAIR 023.
j Credit for Previous Actions You may take credit for any initial BSI or visual inspection of the combustion outer liner shell required by paragraphs g1 and 2 of this AD if you performed the initial BSI
or visual inspection before the effective date of this AD using:
1 GE CF348CAL S/B 72A0335, Original Issue, dated June 27, 2019;
2 GE CF348C Alert SB 72A0335 R01, dated September 23, 2019;
3 GE CF348EAL S/B 72A0221, Original Issue, dated June 27, 2019; or 4 GE CF348E Alert SB 72A0221 R01, dated September 23, 2019.
k 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.

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