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Federal Register / Vol. 86, No. 59 / Tuesday, March 30, 2021 / Rules and Regulations
Revision A, dated July 30, 2019
Gulfstream CB 231A. The service information contains procedures for the inspection of the RBL 6, FS 499, 531, and 569.5, and the bushing in the lower end of the link and all attachments for corrosion.
The FAA reviewed Table 13: Fuselage Inspection Table in Section 051010 of Chapter 5Time Limits/Maintenance Checks of Gulfstream GV Aircraft
Maintenance Manual, Revision 51, dated February 28, 2020. The service information identifies tasks for a recurring detailed inspection of the floor beam and wing links FS 465 through FS
576.
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 the ADDRESSES section.

Differences Between This AD and the Service Information Gulfstream CB 231A specifies reporting the results of the inspection to Gulfstream, and this AD does not.
Costs of Compliance The FAA estimates that this AD
affects 148 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS
Cost per product
Cost on U.S.
operators
Action
Labor cost
Parts cost
Inspection per the Customer Bulletin, all 3
locations.
Revise the AMM

120 work-hours $85 per hour = $10,200

Not applicable

$10,200

$1,509,600

1 work-hour $85 per hour = $85

Not applicable

85

12,580

The FAA estimates the following costs to do any necessary replacements that would be required based on the
results of the inspection. The FAA has no way of determining the number of
airplanes that might need these replacements:

ON-CONDITION COSTS
Action
Labor cost
Parts cost
Cost per product
Replacement of all 3 links

40 work-hours $85 per hour = $3,400

$316

$3,716

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 operators.

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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 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
16:21 Mar 29, 2021

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:

This AD will not have federalism implications under Executive Order
VerDate Sep<11>2014

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.

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Authority: 49 U.S.C. 106g, 40113, 44701.

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39.13

Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

20210604 Gulfstream Aerospace Corporation: Amendment 3921471;
Docket No. FAA20200831; Project Identifier 2019CE031AD.
a Effective Date This airworthiness directive AD is effective May 4, 2021.
b Affected ADs None.
c Applicability This AD applies to Gulfstream Aerospace Corporation Model GV airplanes, all serial numbers, certificated in any category.
d Subject Air Transport Association of America ATA Code 53: Fuselage Structure.
e Reason This AD was prompted by a report that current inspection procedures of floor beam support links, which can fail due to corrosion, are inadequate. The FAA is issuing this AD to detect and correct corrosion on a floor beam support link lower bushing. This condition, if not addressed, could result in link failure, which can compromise the integrity of the pressure vessel floor and lead to loss of pressurization of the airplane.

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