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Federal Register / Vol. 86, No. 137 / Wednesday, July 21, 2021 / Rules and Regulations
easier installation of the ultrasonic probes. UPS commented that all locally manufactured probe application tools would be removed before the USI, similar to using probe application tool P/N SGP156.
This AD does not address requests for specific tool modifications. However, the FAA will consider requests for alternative methods of compliance requests in accordance with paragraph k of this AD that include a request for the modifications to the probe application tool.
Request for Add Credit for Previous Action Cathay requested that this AD provide credit for previous performance of inspections of the fuel manifold before the effective date of this AD in accordance with both GE GEnx2B SB
730089 R01, dated January 11, 2021, and R00, dated May 8, 2020.
The FAA agrees. The instructions for accomplishing the on-wing USI and FPI
have not changed between R00, dated May 8, 2020, and R01, dated January 11, 2021, of GE GEnx2B SB 730089. The
FAA added a Credit for Previous Actions paragraph to this AD.
Support for the AD
ALPA, Boeing, and GE expressed support for the AD as written.
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 GE GEnx2B SB
730089 R01, dated January 11, 2021.
The service information specifies procedures for performing an initial onwing visual inspection, a USI, or an FPI
of the top main fuel manifold and the lower fuel manifold. The service information also specifies procedures
for performing repetitive in-shop visual inspection and FPI for GEnx2B model turbofan engines. The service information also provides instructions for replacing the top main fuel manifold and lower fuel manifold if a crack is found that exceeds the manufacturers criteria or if a leak is detected during inspection. 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. The design approval holder is currently developing a modification to address the unsafe condition identified in this AD. Once this modification is developed, the FAA
might consider additional rulemaking.
Costs of Compliance The FAA estimates that this AD
affects 156 engines installed on airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS
Action
Labor cost
FPI or USI of the lower fuel manifold

16 work-hours $85 per hour = $1,360

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

$1,360

Cost on U.S.
operators $212,160

aircraft that might need this replacement:

ON-CONDITION COSTS
Action
Labor cost
Replace the lower fuel manifold

2 work-hours $85 per hour = $170

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.

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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
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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 This AD will not have federalism implications under Executive Order 13132. This AD will not have a
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Parts cost $47,730

Cost per product $47,900

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.

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