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2021-26-02 GULFSTREAM AEROSPACE CORPORATION: Amendment 39-21860; Docket No. FAA-2021-0216; Project Identifier 2018-CE-061-AD.
(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective January 14, 2022.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to Gulfstream Aerospace Corporation Model GV and GV-SP
    airplanes, all serial numbers, certificated in any category.

Note 1 to paragraph (c): Model GV-SP airplanes are also referred to by the
marketing designations G500, G550, and G500-5000.

(d) SUBJECT

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

(e) UNSAFE CONDITION

    This AD was prompted by the omission of a life limit in the airworthi-
    ness 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 al-
    ready done.

(g) REVISE THE ALS

    Within 12 months after the effective date of this AD, revise the exist
    -ing 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 1159SCL566
    -15.

Note 2 to paragraph (g): Table 5 in Section 05-10-10 of the following air-
craft maintenance manuals contains the life limit in paragraph (g) of this
AD: Gulfstream GV Aircraft Maintenance Manual Revision 53, dated March 15,
2021; Gulfstream G550 Aircraft Maintenance Manual Revision 34, dated March
15, 2021; or Gulfstream G500-5000 Aircraft Maintenance Manual Revision 34,
dated March 15, 2021.

(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 paragraph (i)(1) of this AD.

(2) Before using any approved AMOC,  notify your appropriate principal in-
    spector, or lacking  a principal inspector,  the manager of  the local
    flight standards district office/certificate holding district office.

(i) RELATED INFORMATION

(1) For more  information  about this AD,  contact  Miral Patel,  Aviation
    Safety Engineer, Atlanta ACO Branch FAA, 1701 Columbia Avenue, College
    Park, GA 30337; phone (404) 474-5590; fax (404) 474-5606; email miral.
    patel@faa.gov.

(2) For service information identified in this AD, contact Gulfstream Aero
    -space Corporation, Technical Publications Dept., 500 Gulfstream Road,
    Savannah, GA 31402-2206;  phone: (800) 810-4853;  fax: (912) 965-3520;
    email:  pubs@gulfstream.com;  website:  https://www.gulfstream.com/en/
    customer-support/. You may view this referenced 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 (817) 222-5110.

(j) MATERIAL INCORPORATED BY REFERENCE

    None.

Issued on December 6, 2021. Lance T Gant, Director, Compliance & Airworth-
iness Division, Aircraft Certification Service.

FOR FURTHER INFORMATION CONTACT: Miral Patel,  Aviation  Safety  Engineer,
Atlanta ACO Branch,  FAA,  1701 Columbia Avenue,  College Park,  GA 30337;
phone: (404) 474-5590; fax: (404) 474-5606; email: miral.patel@faa.gov.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2021-0216; Project Identifier 2018-CE-061-AD; Amendment
39-21860; AD 2021-26-02]
RIN 2120-AA64

Airworthiness Directives; Gulfstream Aerospace Corporation Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all
Gulfstream Aerospace Corporation (Gulfstream) Model GV and GV-SP
airplanes. This AD was prompted by the omission of a life limit in the
airworthiness limitations section (ALS) of the maintenance manual for a
certain main landing gear (MLG) trunnion pin. This AD requires revising
the ALS of your existing instructions for continued airworthiness (ICA)
or inspection program for the airplane to establish a life limit of
20,000 flight cycles for the affected MLG trunnion pin. The FAA is
issuing this AD to address the unsafe condition on these products.

DATES: This AD is effective January 14, 2022.

ADDRESSES: For service information identified in this final rule,
contact Gulfstream Aerospace Corporation, Technical Publications Dept.,
500 Gulfstream Road, Savannah, GA 31402-2206; phone: (800) 810-4853;
fax: (912) 965-3520; email: pubs@gulfstream.com; website: https://www.gulfstream.com/en/customer-support/. 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 (817) 222-5110.

Examining the AD Docket


You may examine the AD docket at https://www.regulations.gov by
searching for and locating Docket No. FAA-2021-0216; 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, M-
30, West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue
SE, Washington, DC 20590.

FOR FURTHER INFORMATION CONTACT
: Miral Patel, Aviation Safety Engineer,
Atlanta ACO Branch, FAA, 1701 Columbia Avenue, College Park, GA 30337;
phone: (404) 474-5590; fax: (404) 474-5606; email: miral.patel@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 all Gulfstream
Aerospace Corporation (Gulfstream) Model GV and GV-SP airplanes. The
NPRM published in the Federal Register on September 17, 2021 (86 FR
51842). The NPRM was prompted by notification from Gulfstream that a
life limit for replacing MLG trunnion pin part number (P/N) 1159SCL566-
15 had been omitted from the ALS of the maintenance manual for Model GV
and GV-SP airplanes. Gulfstream revised the ALS for the applicable
airplanes to establish a life limit of 20,000 flight cycles for the
affected MLG trunnion pin. A trunnion pin remaining in service beyond
its fatigue life could lead to fracture and failure of the trunnion
pin.
In the NPRM, the FAA proposed to require revising the ALS of your
ICA or inspection program for the airplane to establish a life limit of
20,000 flight cycles for the affected MLG trunnion pin. The FAA is
issuing this AD to prevent MLG failure, which could lead to a runway
excursion.

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

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 G500-5000
Aircraft Maintenance Manual, Revision 34, 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
1159SCL566-15.

Costs of Compliance

The FAA estimates that this AD affects 516 airplanes of U.S.
registry.
The FAA estimates the following costs to comply with this AD:

Estimated Costs

Action
Labor cost
Parts cost
Cost per airplane
Cost on U.S. operators
Revise the ALS 1 work-hour x $85 per hour = $85
Not applicable
$85
$43,860

Authority for This Rulemaking

Title 49 of the United States Code specifies the FAA's 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 Agency's 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

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.
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.

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 39--AIRWORTHINESS DIRECTIVES

1. The authority citation for part 39 continues to read as follows:

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

Sec. 39.13 [Amended]

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