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Federal Register / Vol. 86, No. 138 / Thursday, July 22, 2021 / Rules and Regulations This AD is effective August 26, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of August 26, 2021.
ADDRESSES: For service information identified in this final rule, contact Gulfstream Aerospace Corporation, Technical Publications Dept., P.O. Box 2206, Savannah, GA 31402; phone:
800 8104853; email: pubs@
gulfstream.com; website: https
www.gulfstream.com/en/customersupport/. You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 901 Locust, Kansas City, MO
64106. For information on the availability of this material at the FAA, call 816 3294148. It is also available at https www.regulations.gov by searching for and locating Docket No.
FAA20210156.
DATES:

Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210156; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this final rule, any comments received, and other information. The address for Docket Operations is U.S. Department of Transportation, Docket Operations, M30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Jeffrey Johnson, Aviation Safety Engineer, Atlanta ACO Branch, FAA, 1701 Columbia Ave., College Park, GA
30337; phone: 404 4745554; fax: 404
4745606; email: jeffrey.d.johnson@
faa.gov.
SUPPLEMENTARY INFORMATION:
Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR

part 39 by adding an AD that would apply to certain Gulfstream Aerospace Corporation Gulfstream Model GVII
G500 airplanes. The NPRM published in the Federal Register on May 7, 2021 86
FR 24546. The NPRM was prompted by a failure that occurred during flight testing of a Gulfstream Model GVII
G500 airplane, when the aircraft was configuring for a steep approach test point, the crew received a flap failure message. After landing, inspection revealed that the left-hand flap track B
yoke had become disconnected due to structural failure. Gulfstreams investigation to determine the root cause of the failure revealed that the flap yoke fittings for certain serialnumbered Gulfstream Model GVIIG500
airplanes have design features that cause decreased fatigue life. In the NPRM, the FAA proposed to require replacing the flap inboard and outboard yoke fitting assemblies and revising the Airworthiness Limitations Instructions of your existing aircraft maintenance manual AMM to incorporate a 20,000
flight cycle life limit. The FAA is issuing this AD to address the unsafe condition on these products.
Discussion of Final Airworthiness Directive Comments The FAA received no comments on the NPRM or on the determination of the costs.
Conclusion The FAA reviewed the relevant data 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. This AD is adopted as proposed in the NPRM.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Gulfstream GVII
G500 Aircraft Service Change No. 032, Initial Issue, dated November 20, 2020

38539

Gulfstream ASC No. 032. This service information specifies procedures for replacing the flap inboard and outboard yoke fitting assemblies and upper bushings. 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.
Other Related Service Information The FAA reviewed Gulfstream GVII
500 Customer Bulletin No. 045, Initial Issue, dated November 20, 2020. This service information specifies the compliance time and additional information for Gulfstream ASC No.
032. The FAA also reviewed Gulfstream Aerospace GVIIG500 Aircraft Maintenance Manual Document Number GACACGVIIG500AMM
0001, Revision 7, dated December 15, 2020. This document contains revised airworthiness limitations, maintenance checks, and inspections.
Differences Between This AD and the Service Information Gulfstream ASC No. 032 contains actions labeled Required for Compliance RC, and the language in Gulfstream ASC No. 032 and in paragraph h3 of this AD indicates that operators must comply with all actions labeled RC for compliance with this AD. However, this AD does not require all of the steps in Gulfstream ASC No. 032 that are labeled as RC.
Operators only need to comply with the RC steps specified in paragraph g of this AD.
Costs of Compliance The FAA estimates that this AD
affects 85 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

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

83.5 work-hours $85.00 per hour =
$7,097.50.

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
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Parts cost
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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$8,015.00

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

$1,284,562.50

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
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