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Federal Register / Vol. 86, No. 178 / Friday, September 17, 2021 / Proposed Rules
dated March 15, 2021. For the applicable marketing designation specified on each document, the revised service information adds a life limit for MLG trunnion pin P/N 1159SCL56615.

pin. A trunnion pin remaining in service beyond its fatigue life could lead to fracture and failure of the trunnion pin. This condition, if unaddressed, could result in MLG failure and could lead to a runway excursion.

placed in the public docket of this NPRM. Submissions containing CBI
should be sent to Miral Patel, Aviation Safety Engineer, Atlanta ACO Branch, FAA, 1701 Columbia Avenue, College Park, GA 30337. Any commentary that the FAA receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.
Background Gulfstream notified the FAA that a life limit for replacing MLG trunnion pin part number P/N 1159SCL56615
had been omitted from the ALS of the maintenance manual for Models GV and GVSP airplanes. Gulfstream revised the ALS for the applicable airplanes to establish a life limit of 20,000 flight cycles for the affected MLG trunnion
51843

Proposed AD Requirements in This NPRM

FAAs Determination The FAA is issuing this NPRM after determining that the unsafe condition described previously is likely to exist or develop on other products of the same type design.

This proposed AD would require revising the ALS of the existing ICA or inspection program for the airplane to establish a life limit of 20,000 flight cycles for MLG trunnion pin P/N
1159SCL56615.

Related Service Information The FAA reviewed Gulfstream GV
Aircraft Maintenance Manual, Revision 53, dated March 15, 2021; Gulfstream G550 Aircraft Maintenance Manual, Revision 34, dated March 15, 2021; and Gulfstream G5005000 Aircraft Maintenance Manual, Revision 34,
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 516
airplanes of U.S. registry.
The FAA estimates the following costs to comply with this proposed AD:

ESTIMATED COSTS
Cost per product
Action
Labor cost
Parts cost
Revise the ALS

1 work-hour $85 per hour = $85

Not applicable

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.

VerDate Sep<11>2014

15:47 Sep 16, 2021

b Affected ADs
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

Joint Aircraft System Component JASC
Code 3200, Landing Gear System.

The Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 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.

Jkt 253001

$43,860

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.

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:

$85

Cost on U.S.
operators
39.13

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

Gulfstream Aerospace Corporation: Docket No. FAA20210216; Project Identifier 2018CE061AD.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by November 1, 2021.

PO 00000

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Fmt 4702

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None.
c Applicability This AD applies to Gulfstream Aerospace Corporation Models GV and GVSP
airplanes, all serial numbers, certificated in any category.
d Subject
e Unsafe Condition This AD was prompted by the omission of a life limit in the airworthiness limitations section ALS for a certain main landing gear MLG trunnion pin. The FAA is issuing this AD to prevent a MLG trunnion pin from remaining in service beyond its fatigue life.
This unsafe condition, if not addressed, could result in MLG failure and could lead to a runway excursion.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Revise the ALS
Within 12 months after the effective date of this AD, revise the existing ALS 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 MLG trunnion pin part number 1159SCL56615.
Note 1 to paragraph g of this AD: Table 5 in Section 051010 of the following aircraft maintenance manuals contains the life limit in paragraph g of this AD:
Gulfstream GV Aircraft Maintenance Manual,
E:FRFM17SEP1.SGM

17SEP1