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Federal Register / Vol. 86, No. 87 / Friday, May 7, 2021 / Proposed Rules
Costs of Compliance
The FAA estimates the following costs to comply with this proposed AD:

The FAA estimates that this AD, if adopted as proposed, would affect 85
airplanes of U.S. registry.

ESTIMATED COSTS
Action
Labor cost
Parts cost
Replace the flap inboard and outboard yoke fitting assemblies and update the existing AMM.

83.5 work-hours $85 per hour = $7,097.50

Authority for This Rulemaking
The Proposed Amendment
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.

Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows:

Regulatory Findings The FAA determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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 this proposed regulation:
1 Is not a significant regulatory action under Executive Order 12866, 2 Would not affect intrastate aviation in Alaska, and 3 Would not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

VerDate Sep<11>2014

17:32 May 06, 2021

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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:

Gulfstream Aerospace Corporation: Docket No. FAA20210156; Project Identifier AD202001594T.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by June 21, 2021.
b Affected ADs None.
c Applicability This AD applies to Gulfstream Aerospace Corporation Model GVIIG500 airplanes, serial numbers 72001 through 72085, certificated in any category.
d Subject Joint Aircraft System Component JASC
Code 5753, Trailing Edge Flaps.
e Unsafe Condition This AD results from flap yoke fittings with design features that cause decreased fatigue life. The FAA is issuing this AD to prevent failure of the flap yoke fitting. The unsafe condition, if not addressed, could result in failure of the flap yoke fitting during flap transition, which could cause the flaps to stop moving. This, combined with additional failures in the flap actuator force limiter or flap yoke actuator disconnect, could result in asymmetric flap positions leading to a loss of airplane control.
f Compliance Comply with this AD within the compliance times specified, unless already done.

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$8,015.00

Cost per product
Cost on U.S.
operators
$15,112.50

$1,284,562.50

g Required Actions 1 Within 24 months after the effective date of this AD or within 500 flight cycles after the effective date of this AD, whichever occurs first, replace each flap yoke fitting assembly by following Sections III.A.2
through III.D of the Modification Instructions in Gulfstream GVIIG500 Aircraft Service Change No. 032, Initial Issue, dated November 20, 2020 Gulfstream ASC No.
032.
2 Within 24 months after the effective date of this AD, revise the existing Airworthiness Limitations section of the Instructions for Continued Airworthiness or aircraft inspection program for your airplane by establishing a life limit of 20,000 flight cycles for each flap yoke fitting part number 72P5755095A001, 72P5755096A001, 72P5755097A001, and 72P5755098A001.
Note 1 to paragraph g2: Section 0510
10 of Gulfstream Aerospace GVIIG500
Aircraft Maintenance Manual AMM
Document Number GACACGVIIG500
AMM0001, Revision 7, dated December 15, 2020, contains the life limit in paragraph g2 of this AD.
h Alternative Methods of Compliance AMOCs 1 The Manager, Atlanta ACO 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.
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.
3 For service information that contains steps that are labeled as Required for Compliance RC, the following provisions apply.
i The steps labeled as RC, including substeps under an RC step and any figures identified in an RC step, must be done to comply with the AD. An AMOC is required for any deviations to RC steps, including substeps and identified figures.
ii Steps not labeled as RC may be deviated from using accepted methods in accordance with the operators maintenance or inspection program without obtaining
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