Airworthiness Directives; Gulfstream Aerospace LP (Type Certificate Previously Held by Israel Aircraft Industries, Ltd.) Airplanes

[Federal Register Volume 91, Number 175 (Friday, September 11, 2026)]
[Rules and Regulations]
[Pages 57775-57777]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2026-18600]



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Rules and Regulations
                                                Federal Register
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Federal Register / Vol. 91, No. 175 / Friday, September 11, 2026 / 
Rules and Regulations

[[Page 57775]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2026-4654; Project Identifier MCAI-2026-00346-T; 
Amendment 39-23461; AD 2026-18-06]
RIN 2120-AA64


Airworthiness Directives; Gulfstream Aerospace LP (Type 
Certificate Previously Held by Israel Aircraft Industries, Ltd.) 
Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2025-15-
04, which applied to all Gulfstream Aerospace LP Model G150 airplanes. 
AD 2025-15-04 required revising the existing maintenance or inspection 
program, as applicable, to incorporate a new airworthiness limitation. 
Since the FAA issued AD 2025-15-04, the FAA has determined that new or 
more restrictive airworthiness limitations are necessary. This AD 
continues to require actions in AD 2025-15-04 and requires revising the 
existing maintenance or inspection program, as applicable, to 
incorporate new or more restrictive airworthiness limitations. The FAA 
is issuing this AD to address the unsafe condition on these products.

DATES: This AD is effective October 16, 2026.
    The Director of the Federal Register approved the incorporation by 
reference of a certain publication listed in this AD as of October 16, 
2026.
    The Director of the Federal Register approved the incorporation by 
reference of a certain other publication listed in this AD as of 
September 10, 2025 (90 FR 37786, August 6, 2025).

ADDRESSES: 
    AD Docket: You may examine the AD docket at regulations.gov under 
Docket No. FAA-2026-4654; 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, the mandatory continuing airworthiness 
information (MCAI), 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.
    Material Incorporated by Reference:
    <bullet> For Civil Aviation Authority of Israel (CAAI) material 
identified in this AD, contact CAAI, P.O. Box 1101, Golan Street, 
Airport City, 70100, Israel; telephone 972-3-9774665; fax 972-3-
9774592; email [email protected]. You may find this material on the CAAI 
website at www.gov.il/en/pages/israeli-airworthiness-directives.
    <bullet> You may view this material at the FAA, Airworthiness 
Products Section, Operational Safety Branch, 2200 South 216th St., Des 
Moines, WA. For information on the availability of this material at the 
FAA, call 206-231-3195. It is also available at regulations.gov under 
Docket No. FAA-2026-4654.

FOR FURTHER INFORMATION CONTACT: Frank Huynh, Aviation Safety Engineer, 
FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: 404-
983-5288; email: [email protected].

SUPPLEMENTARY INFORMATION:

Background

    The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 
CFR part 39 to supersede AD 2025-15-04, Amendment 39-23091 (90 FR 
37786, August 6, 2025) (AD 2025-15-04). AD 2025-15-04 applied to all 
Gulfstream Aerospace LP Model G150 airplanes. AD 2025-15-04 required 
revising the existing maintenance or inspection program, as applicable, 
to incorporate a new airworthiness limitation. The FAA issued AD 2025-
15-04 to address failure of the nose landing gear (NLG) actuator-to-
strut attachment pin. The unsafe condition, if not addressed, could 
result in failure of the NLG to retract and lock after take-off or 
extend and lock before landing.
    The NPRM was published in the Federal Register on June 9, 2026 (91 
FR 34788). The NPRM was prompted by CAAI AD ISR I-05-2025-10-1, dated 
October 15, 2025 (CAAI AD ISR I-05-2025-10-1) (also referred to as the 
MCAI), issued by CAAI, which is the aviation authority for Israel. The 
MCAI states that new or more restrictive airworthiness limitations have 
been developed as specified in Gulfstream 150 Maintenance Manual, 
Section 05-10-10, Revision 30, dated September 15, 2025, which includes 
an inspection reporting procedure.
    In the NPRM, the FAA proposed to continue to require the actions in 
AD 2025-15-04 and require revising the existing maintenance or 
inspection program, as applicable, to incorporate new or more 
restrictive airworthiness limitations, as specified in CAAI AD ISR I-
05-2025-10-1.
    The FAA is issuing this AD to address fatigue damage in principal 
structural elements of the horizontal stabilizer and elevator systems. 
The unsafe condition, if not addressed, could result in undetected 
fatigue cracking in critical empennage structural components, loss of 
elevator control authority, and reduced structural integrity of the 
airplane.
    You may examine the MCAI in the AD docket at regulations.gov under 
Docket No. FAA-2026-4654.

Discussion of Final Airworthiness Directive

Comments

    The FAA received a comment from one individual who supported the 
NPRM without change.

Conclusion

    These products have been approved by the civil aviation authority 
of another country and are approved for operation in the United States. 
Pursuant to the FAA's bilateral agreement with this State of Design 
Authority, that authority has notified the FAA of the unsafe condition 
described in the MCAI referenced above. The FAA reviewed the relevant 
data, considered any comments received, 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. Except for 
minor editorial changes, this AD is adopted as proposed in the NPRM. 
None of the changes will increase the economic burden on any operator.

[[Page 57776]]

Material Incorporated by Reference Under 1 CFR Part 51

    CAAI AD ISR I-05-2025-10-1 specifies new or more restrictive 
airworthiness limitations for airplane structures and safe life limits, 
which include an inspection reporting procedure.
    This AD also requires CAAI AD ISR I-32-24-10-01R1, which the 
Director of the Federal Register approved for incorporation by 
reference as of September 10, 2025 (90 FR 37786, August 6, 2025).
    This material 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.

Costs of Compliance

    The FAA estimates that this AD affects 82 airplanes of U.S. 
registry. The FAA estimates the following costs to comply with this AD: 
The FAA estimates the total cost per operator for the retained actions 
from AD 2025-15-04 to be $7,650 (90 work-hours x $85 per work-hour).
    The FAA has determined that revising the existing maintenance or 
inspection program takes an average of 90 work-hours per operator, 
although the agency recognizes that this number may vary from operator 
to operator. Since operators incorporate maintenance or inspection 
program changes for their affected fleet(s), the FAA has determined 
that a per-operator estimate is more accurate than a per-airplane 
estimate.
    The FAA estimates the total cost per operator for the new actions 
to be $7,650 (90 work-hours x $85 per work-hour).

Paperwork Reduction Act

    A federal agency may not conduct or sponsor, and a person is not 
required to respond to, nor shall a person be subject to a penalty for 
failure to comply with a collection of information subject to the 
requirements of the Paperwork Reduction Act unless that collection of 
information displays a currently valid OMB Control Number. The OMB 
Control Number for this information collection is 2120-0056. Public 
reporting for this collection of information is estimated to take 
approximately 1 hour per response, including the time for reviewing 
instructions, searching existing data sources, gathering and 
maintaining the data needed, and completing and reviewing the 
collection of information. All responses to this collection of 
information are mandatory. Send comments regarding this burden estimate 
or any other aspect of this collection of information, including 
suggestions for reducing this burden, to: Information Collection 
Clearance Officer, Federal Aviation Administration, 10101 Hillwood 
Parkway, Fort Worth, TX 76177-1524.

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

0
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]

0
2. The FAA amends Sec.  39.13 by:
0
a. Removing Airworthiness Directive (AD) 2025-15-04, Amendment 39-23091 
(90 FR 37786, August 6, 2025); and
0
b. Adding the following new AD:

2026-18-06 Gulfstream Aerospace LP (Type Certificate Previously Held 
by Israel Aircraft Industries, Ltd.): Amendment 39-23461; Docket No. 
FAA-2026-4654; Project Identifier MCAI-2026-00346-T.

(a) Effective Date

    This airworthiness directive (AD) is effective October 16, 2026.

(b) Affected ADs

    This AD replaces AD 2025-15-04, Amendment 39-23091 (90 FR 37786, 
August 6, 2025) (AD 2025-15-04).

(c) Applicability

    This AD applies to all Gulfstream Aerospace (Type Certificate 
previously held by Israel Aircraft Industries, Ltd.) LP Model 
Gulfstream G150 airplanes, certificated in any category.

(d) Subject

    Air Transport Association (ATA) of America Code 05, Time limits/
Maintenance checks.

(e) Unsafe Condition

    This AD was prompted by a determination that new or more 
restrictive airworthiness limitations are necessary. The FAA is 
issuing this AD to address fatigue damage in principal structural 
elements of the horizontal stabilizer and elevator systems, and to 
prevent failure of the nose landing gear (NLG) actuator to strut 
attachment pin. The unsafe condition, if not addressed, could result 
in undetected fatigue cracking in critical empennage structural 
components, loss of elevator control authority, and reduced 
structural integrity of the airplane, or the failure of the NLG to 
properly retract and lock after takeoff or extend and lock before 
landing.

(f) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

(g) Retained Revision of the Existing Maintenance or Inspection 
Program, With a New Terminating Action

    This paragraph restates the requirements of paragraph (g) of AD 
2025-15-04, with a new terminating action. Except as specified in 
paragraph (h) of this AD: Comply with all required actions and 
compliance times specified in, and in accordance with, Civil 
Aviation Authority of Israel (CAAI) AD ISR

[[Page 57777]]

I-32-24-10-01R1, revised October 15, 2024 (CAAI AD ISR I-32-24-10-
01R1). Accomplishing the revision of the existing maintenance or 
inspection program required by paragraph (j) of this AD terminates 
the requirements of this paragraph.

(h) Retained Exceptions to CAAI AD ISR I 32 24-10-01R1, With No Changes

    This paragraph restates the exceptions specified in paragraph 
(h) of AD 2025-15-04, with no changes.
    (1) Where CAAI AD ISR I-32-24-10-01R1 refers to its effective 
date, this AD requires using September 10, 2025 (the effective date 
of AD 2025-15-04).
    (2) The initial compliance time for doing the task specified in 
the Action paragraph of CAAI AD ISR I-32-24-10-01R1 is at the 
applicable ``discard'' interval as specified in the material 
referenced in the Action paragraph of CAAI AD ISR I-32-24-10-01R1, 
or within 3 months after September 10, 2025 (the effective date of 
AD 2025-15-04), whichever occurs later.
    (3) Where the Action paragraph of CAAI AD ISR I-32-24-10-01R1 
specifies to ``incorporate AMM Revision 29'', this AD requires 
replacing that text with ``revise the existing maintenance or 
inspection program, as applicable, by incorporating the Nose Landing 
Gear Actuator to Nose Landing Gear Strut Attachment Pin task 
identified in AMM Revision 29''.

(i) Retained Provisions for Alternative Actions and Intervals, With a 
New Exception

    This paragraph restates the requirements of paragraph (i) of AD 
2025-15-04, with a new exception. Except as required by paragraph 
(j) of this AD, after the existing maintenance or inspection program 
has been revised as required by paragraph (g) of this AD, no 
alternative actions (e.g., inspections) or intervals are allowed 
unless they are approved as specified in the provisions of paragraph 
(m)(1) of this AD.

(j) New Requirements

    Except as specified in paragraph (k) of this AD: Comply with all 
required actions and compliance times specified in, and in 
accordance with, CAAI AD ISR I-05-2025-10-1, October 15, 2025 (CAAI 
AD ISR I-05-2025-10-1). Accomplishing the revision of the existing 
maintenance or inspection program required by this paragraph 
terminates the requirements of paragraph (g) of this AD.

(k) Exceptions to CAAI AD ISR I-05-2025-10-1

    (1) Where CAAI AD ISR I-05-2025-10-1 refers to its effective 
date, this AD requires using the effective date of this AD.
    (2) Where the Action paragraph of CAAI AD ISR I-05-2025-10-1 
specifies to ``incorporate AMM Revision 30'', this AD requires 
replacing the text with ``revise the existing maintenance or 
inspection program, as applicable, to incorporate the information 
specified in Section 05-10-10 Airworthiness Limitations, Chapter 05 
Time Limits/Maintenance Checks, Gulfstream G150 Maintenance Manual, 
Revision 30, dated September 15, 2025''.
    (3) The initial compliance time for doing the tasks specified in 
the material referenced in the Action paragraph of CAAI AD ISR I-05-
2025-10-1 is at the applicable initial inspection interval, comply 
within time, or discard interval specified in the material 
referenced in the Action paragraph of CAAI AD ISR I-05-2025-10-1, or 
within 90 days after the effective date of this AD, whichever occurs 
later.

(l) New Provisions for Alternative Actions and Intervals

    After the existing maintenance or inspection program has been 
revised as required by paragraph (j) of this AD, no alternative 
actions (e.g., inspections) and intervals are allowed unless they 
are approved as specified in the provisions of the Action paragraph 
of CAAI AD ISR I-05-2025-10-1.

(m) Additional AD Provisions

    The following provisions also apply to this AD.
    (1) Alternative Methods of Compliance (AMOCs): The Manager, 
International Validation 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 
International Validation Branch, send it to the attention of the 
person identified in paragraph (n) of this AD and email to: 
[email protected]. Before using any approved AMOC, notify your 
appropriate principal inspector, or lacking a principal inspector, 
the manager of the responsible Flight Standards Office.
    (2) Contacting the Manufacturer: For any requirement in this AD 
to obtain instructions from a manufacturer, the instructions must be 
accomplished using a method approved by the Manager, International 
Validation Branch, FAA; or CAAI; or CAAI's authorized Designee. If 
approved by the CAAI Designee, the approval must include the 
Designee's authorized signature.

(n) Additional Information

    For more information about this AD, contact Frank Huynh, 
Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, 
Westbury, NY 11590; phone: 404-983-5288; email: [email protected].

(o) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference (IBR) of the material listed in this 
paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
    (2) You must use this material as applicable to do the actions 
required by this AD, unless the AD specifies otherwise.
    (3) The following material was approved for IBR on October 16, 
2026.
    (i) Civil Aviation Authority of Israel (CAAI) AD ISR I-05-2025-
10-1, dated October 15, 2025.
    (ii) [Reserved]
    (4) The following material was approved for IBR on September 10, 
2025 (90 FR 37786, August 6, 2025).
    (i) Civil Aviation Authority of Israel (CAAI) AD ISR I-32-24-10-
01R1, revised October 15, 2024.
    (ii) [Reserved]
    (5) For CAAI material identified in this AD, contact CAAI, P.O. 
Box 1101, Golan Street, Airport City, 70100, Israel; telephone 972-
3-9774665; fax 972-3-9774592; email [email protected]. You may find 
this material on the CAAI website at www.gov.il/en/pages/israeli-
airworthiness-directives.
    (6) You may view this material at the FAA, Airworthiness 
Products Section, Operational Safety Branch, 2200 South 216th St., 
Des Moines, WA. For information on the availability of this material 
at the FAA, call 206-231-3195.
    (7) You may view this material at the National Archives and 
Records Administration (NARA). For information on the availability 
of this material at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations or email [email protected].

    Issued on August 31, 2026.
Christopher R. Parker,
Acting Deputy Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2026-18600 Filed 9-10-26; 8:45 am]
BILLING CODE 4910-13-P

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