FAA对波音787（罗罗Trent 1000发动机）发布最终适航指令：仅22架美国在册飞机受影响，合规成本约5,610美元，且系8月提案的原样落地

[4910-13-P]
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2026-7233; Project Identifier AD-2026-00062-T; Amendment 3923489; AD 2026-20-16]
RIN 2120-AA64
Airworthiness Directives; The Boeing Company Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
SUMMARY: The FAA is adopting a new airworthiness directive (AD) for certain The
Boeing Company Model 787-8, 787-9, and 787-10 airplanes. This AD was prompted by a
report indicating that the protection system on the left fan cowl of the right engine does
not sufficiently cover the components and systems from possible cross engine debris.
This AD requires performing a maintenance records check or inspection of the right
engine to determine the part number of the left fan cowl and applicable on-condition
actions. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective [INSERT DATE 35 DAYS AFTER DATE OF
PUBLICATION IN THE FEDERAL REGISTER].
The Director of the Federal Register approved the incorporation by reference of a
certain publication listed in this AD as of [INSERT DATE 35 DAYS AFTER DATE OF
PUBLICATION IN THE FEDERAL REGISTER].
ADDRESSES:
AD Docket: You may examine the AD docket at regulations.gov under Docket No. FAA2026-7233; 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.
Material Incorporated by Reference:
• For Boeing material identified in this AD, contact Boeing Commercial
Airplanes, Attention: Contractual & Data Services (C&DS), 2600 Westminster Blvd.,
MC 110-SK57, Seal Beach, CA 90740-5600; telephone 562-797-1717; website
myboeingfleet.com.
• 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-2026-7233.
FOR FURTHER INFORMATION CONTACT: Shaan S. Brar, Aviation Safety
Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone: 206-231-3558;
email: shaan.s.brar@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 The Boeing Company Model 787-8,
787-9, and 787-10 Model airplanes. The NPRM was published in the Federal Register on
August 7, 2026 (91 FR 51111). The NPRM was prompted by a report from the
manufacturer indicating that the protection system on the left fan cowl of the right engine
does not sufficiently cover the components and systems for airplanes equipped with Rolls
Royce Deutschland Ltd & Co KG (RRD) Model Trent 1000-AE3, 1000-CE3, 1000-D3,
1000-G3, 1000-H3, 1000-J3, and 1000-K3 engines. In the NPRM, the FAA proposed to
require performing a maintenance records check or inspection of the right engine to

determine the part number of the left fan cowl and applicable on-condition actions. The
FAA is issuing this AD to address insufficient cover leaving multiple oil lines and the
P30 sense line in the right engine exposed to possible cross engine debris from the
intermediate pressure turbine (IPT) rotor stage of the left engine. The unsafe condition, if
not addressed, could lead to damage to critical systems of the right engine due to debris
from the left engine during an uncontained engine failure event, resulting in an in-flight
dual engine shutdown of the airplane.

Discussion of Final Airworthiness Directive
Comments
The FAA received a comment from the Air Line Pilots Association, International
(ALPA) who supported the NPRM without change.
Conclusion
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.
Material Incorporated by Reference Under 1 CFR Part 51
The FAA reviewed Boeing Special Attention Requirements Bulletin B787-81205SB540022-00 RB, Issue 001, dated February 19, 2026. This material specifies procedures
for performing a maintenance records check or inspection of the right engine, left fan
cowl for fan cowl part numbers 725Z2300-307, 725Z2300-305, or 725Z2300-5003, and
applicable on-condition actions. On-condition actions include modifying or replacing the
existing right engine left fan cowl.

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 22 airplanes of U.S. registry. The FAA
estimates the following costs to comply with this AD:
Estimated costs
Parts
cost

Action

Labor cost

Maintenance records check
or inspection

3 work-hours X
$85 per hour = $0
$255

Cost per
product

Cost on
U.S.
operators

$255

$5,610

The FAA estimates the following costs to do any necessary modifications or
replacements that would be required based on the results of the inspection. The agency
has no way of determining the number of aircraft that might need this modification or
replacement:
On-condition costs
Action

Labor cost

Parts cost

Cost per product

Modification of fan
cowl

6 work-hours X $85
per hour = $510

$4,716

$5,226

Replacement of fan
cowl

2 work-hours X $85
per hour = $170

$0*

$170

*The FAA has received no definitive data on which to base the cost estimates for the
replacement parts specified in this AD.
The FAA has included all known costs in its cost estimate. According to the parts
manufacturer, however, some or all of the costs of this AD may be covered under
warranty, thereby reducing the cost impact on affected operators.

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.
§ 39.13 [Amended]
2. The FAA amends § 39.13 by adding the following new airworthiness directive:
2026-20-16 The Boeing Company: Amendment 39-23489; Docket No. FAA-20267233; Project Identifier AD-2026-00062-T.
(a) Effective Date
This airworthiness directive (AD) is effective [INSERT DATE 35 DAYS AFTER
DATE OF PUBLICATION IN THE FEDERAL REGISTER].
(b) Affected ADs
None.
(c) Applicability
This AD applies to The Boeing Company Model 787-8, 787-9, and 787-10
airplanes, certificated in any category, equipped with Rolls Royce Deutschland Ltd & Co
KG Model Trent 1000-AE3, 1000-CE3, 1000-D3, 1000-G3, 1000-H3, 1000-J3, and
1000-K3 engines.
(d) Subject
Air Transport Association (ATA) of America Code 71, Powerplant.
(e) Unsafe Condition
This AD was prompted by a report indicating that the protection system on the
left fan cowl of the right engine does not sufficiently cover the components and systems
from possible cross engine debris. The FAA is issuing this AD to address insufficient

cover leaving multiple oil lines and the P30 sense line in the right engine exposed to
possible cross engine debris from the intermediate pressure turbine (IPT) rotor stage of
the left engine. The unsafe condition, if not addressed, could lead to damage to critical
systems of the right engine due to debris from the left engine during an uncontained
engine failure event, resulting in an in-flight dual engine shutdown of the airplane.
(f) Compliance
Comply with this AD within the compliance times specified, unless already done.
(g) Required Actions
Except as specified by paragraph (h) of this AD: At the applicable times specified
in the “Compliance” paragraph of Boeing Special Attention Requirements Bulletin B78781205-SB540022-00 RB, Issue 001, dated February 19, 2026, do all applicable actions
identified in, and in accordance with, the Accomplishment Instructions of Boeing Special
Attention Requirements Bulletin B787-81205-SB540022-00 RB, Issue 001, dated
February 19, 2026.
Note 1 to paragraph (g): Guidance for accomplishing the actions required by
this AD can be found in Boeing Special Attention Service Bulletin B787-81205SB540022-00, Issue 001, dated February 19, 2026, which is referred to in Boeing Special
Attention Requirements Bulletin B787-81205-SB540022-00 RB, Issue 001, dated
February 19, 2026.
(h) Exceptions to Requirements Bulletin Specifications
Where the “Effectivity” paragraph and the “Compliance” paragraph of Boeing
Special Attention Requirements Bulletin B787-81205-SB540022-00 RB, Issue 001, dated
February 19, 2026, refer to the Issue 001 date of Requirements Bulletin B787-81205SB540022-00 RB, this AD requires using the effective date of this AD.

(i) Parts Installation Prohibition
For airplanes on which a right engine left fan cowl having part numbers
725Z2300-307, 725Z2300-305, or 725Z2300-5003 is not installed: As of the effective
date of this AD, no person may install on any airplane a right engine left fan cowl having
part numbers 725Z2300-307, 725Z2300-305, or 725Z2300-5003.
(j) Alternative Methods of Compliance (AMOCs)
(1) The Manager, AIR-520, Continued Operational Safety 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 responsible Flight Standards Office, as appropriate. If sending information
directly to the manager of the Continued Operational Safety Branch, send it to the
attention of the person identified in paragraph (k)(1) of this AD. Information may be
emailed to: AMOC@faa.gov. Before using any approved AMOC, notify your appropriate
principal inspector, or lacking a principal inspector, the manager of the responsible Flight
Standards Office.
(2) An AMOC that provides an acceptable level of safety may be used for any
repair, modification, or alteration required by this AD if it is approved by The Boeing
Company Organization Designation Authorization (ODA) that has been authorized by the
Manager, AIR-520, Continued Operational Safety Branch, FAA, to make those findings.
To be approved, the repair method, modification deviation, or alteration deviation must
meet the certification basis of the airplane, and the approval must specifically refer to this
AD.
(k) Additional Information
(1) For more information about this AD, contact Shaan S. Brar, Aviation Safety
Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone: 206-231-3558;
email: shaan.s.brar@faa.gov.

(2) Material identified in this AD that is not incorporated by reference is available
at the address specified in paragraph (l)(3) of this AD.
(l) Material Incorporated by Reference
(1) The Director of the Federal Register approved the incorporation by reference
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.
(i) Boeing Special Attention Requirements Bulletin B787-81205-SB54002200 RB, Issue 001, dated February 19, 2026.
(ii) [Reserved]
(3) For Boeing material identified in this AD, contact Boeing Commercial
Airplanes, Attention: Contractual & Data Services (C&DS), 2600 Westminster Blvd.,
MC 110-SK57, Seal Beach, CA 90740-5600; telephone 562-797-1717; website
myboeingfleet.com.
(4) 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.
(5) 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
fr.inspection@nara.gov.
Issued on October 5, 2026.

Lona C. Saccomando,
Acting Deputy Director, Integrated Certificate Management Division,
Aircraft Certification Service.
[FR Doc. 2026-21326 Filed: 10/16/2026 8:45 am; Publication Date: 10/19/2026]