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Federal Register / Vol. 86, No. 172 / Thursday, September 9, 2021 / Rules and Regulations Related Service Information Under 1
CFR Part 51

Conclusion The FAA reviewed the relevant data and determined that air safety requires adopting this AD as proposed. Except for minor editorial changes, this AD is adopted as proposed in the NPRM.
None of the changes will increase the economic burden on any operator.
Accordingly, the FAA is issuing this AD
to address the unsafe condition on these products.

CAAI AD I5720200601 specifies procedures for non-destructive testing high frequency, mid frequency, and bolt hole eddy current inspections; and a liquid dye penetrant inspection for cracking on the forward front spar vertical stiffener and rib 0, installation of a doubler to the forward front spar and rib 0 attachment, and repair if
necessary. This material is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in the ADDRESSES section.
Costs of Compliance The FAA estimates that this AD
affects 23 airplanes of U.S. registry. The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS FOR REQUIRED ACTIONS
Labor cost
Parts cost
Cost per product
Cost on U.S.
operators
80 work-hours $85 per hour = $6,800

$400

$7,200

$165,600

If the actions are accomplished during 4C Check.

The FAA has received no definitive data on which to base the cost estimates for the repair specified in this AD.
According to the manufacturer, some or all of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected operators. The FAA does not control warranty coverage for affected operators.
As a result, the FAA has included all known costs in the cost estimate.

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.

Authority for This Rulemaking
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

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.

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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.

VerDate Sep<11>2014

16:45 Sep 08, 2021

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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:

20211714 Gulfstream Aerospace LP:
Amendment 3921697; Docket No.
FAA20210459; Project Identifier MCAI202100129T.
a Effective Date This airworthiness directive AD is effective October 14, 2021.
b Affected ADs None.
c Applicability This AD applies to Gulfstream Aerospace LP Model Gulfstream G280 airplanes, certificated in any category, as identified in
PO 00000

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The Civil Aviation Authority of Israel CAAI
AD I5720200601, dated January 27, 2021
CAAI AD I5720200601.
d Subject Air Transport Association ATA of America Code 57, Wings.
e Reason This AD was prompted by a report that during full-scale fatigue testing, a crack was found in the area of the attachment of the wing rib 0 to the front spar. The FAA is issuing this AD to address any cracking at the area of the wing rib 0 to the front spar, which could affect the structural integrity of the wing.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Requirements Except as specified in paragraph h of this AD: Comply with all required actions and compliance times specified in, and in accordance with, CAAI AD I57202006
01.
h Exception to CAAI AD I5720200601
Where CAAI AD I5720200601 requires compliance not later than 5,000 flight cycles, this AD requires compliance before the accumulation of 5,000 total flight cycles since the date of issuance of the original Israeli airworthiness certificate or the date of issuance of the original Israeli export certificate of airworthiness.
i No Reporting Requirement Although the service information referenced in CAAI AD I5720200601
specifies to submit certain information to the manufacturer, this AD does not include that requirement.
j Additional AD Provisions The following provisions also apply to this AD:
1 Alternative Methods of Compliance AMOCs: The Manager, Large Aircraft Section, International Validation Branch, FAA, has the authority to approve AMOCs
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