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Federal Register / Vol. 86, No. 178 / Friday, September 17, 2021 / Rules and Regulations TSR limit specified in paragraph h of the proposed AD.
The FAA disagrees. The initial inspection threshold is 17,500 FHs for affected engines. This AD provides a grace period of 500 FHs for in-service engines to prevent the unintentional grounding of airplanes with affected engines. The FAA did not change this AD as a result of this comment.
Request To Include a Terminating Action Horizon Air requested the FAA
petition GE for a terminating action to the inspection requirements in the proposed AD. Horizon Air commented the financial cost and maintenance burden of performing the repetitive inspections are significant.
The FAA disagrees. The FAA
considers this AD to be interim action and will consider further rulemaking if the manufacturer develops a terminating action. The FAA included all estimated costs in the Costs of Compliance section in the preamble of this AD. The FAA
did not change this AD as a result of this comment.
Request To Revise Service Information References Horizon Air, Japan Airlines, and Endeavor Air requested the FAA update references to GE CF348E Alert Service Bulletin SB 72A0221 and GE CF34
8C Alert SB 72A0335 in the Required Actions section, paragraph g, of the proposed AD. Japan Airlines requested that GE CF348EAL S/B 72A0221, Original Issue, dated June 27, 2019, be added to the compliance paragraphs because the Original Issue and R01 have the same inspection methods and limits.
Horizon Air requested that the FAA

reference only GE CF348E Alert SB 72
A0221 R01 in paragraph g of the proposed AD and add a Previous Credit section to allow previous compliance using the Original Issue. Endeavor Air requested that the FAA reference the latest revision of GE CF348C Alert SB
72A0335 in proposed paragraph g.
Endeavor Air indicated that GE planned to issue R02 of CF348C Alert SB 72
A0335 on February 24, 2020.
The FAA agrees to reference the latest revision of these Alert SBs, which is R02 for both GE CF348C Alert SB 72
A0335 and GE CF348E Alert SB 72
A0221, in paragraph g of this AD. The FAA disagrees with the need to reference prior revisions of these Alert SBs in paragraphs g of this AD but agrees to add Credit for Previous Actions, paragraph j, to this AD to allow credit for performing inspections prior to the effective date of this AD.
These changes impose no additional burden on operators who are required to comply with this AD.
Request To Clarify Compliance Japan Airlines requested that the FAA
clarify whether the inspection should occur before or within 500 FHs after the effective date of this AD. Japan Airlines reasoned that the service bulletin specifies to inspect before 500 FHs, while the NPRM proposed to inspect within 500 FHs.
The FAA agrees. The FAA revised Required Actions, paragraphs g1 and 2 of this AD to specify, before accumulating 500 engine FHs.
Support for the AD
ALPA expressed support for the NPRM as written.

51793

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 CF348C Alert SB 72A0335 R02 and General Electric CF348E Alert SB 72
A0221 R02, both dated February 25, 2020. The Alert SBs specify procedures for performing a BSI of the combustion outer liner shell. These documents are distinct since they apply to different engine models. 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 might consider further rulemaking.
Costs of Compliance The FAA estimates that this AD
affects 1,535 engines installed on airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS
Action
Labor cost
BSI or visually inspect the combustion outer liner shell.

3 work-hours $85 per hour = $255

The FAA estimates the following costs to do any necessary replacements that would be required based on the
Cost per product
Parts cost
results of the inspection. The agency has no way of determining the number of
$0

$255

Cost on U.S.
operators $391,425

engines that might need this replacement:

ON-CONDITION COSTS
Action
Labor cost
Replace the combustion outer liner shell

812 work-hours $85 per hour = $69,020

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Parts cost
17SER1

$80,000

Cost per product $149,020