Rule2025-08346
Airworthiness Directives; The Boeing Company Airplanes
Primary source
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Published
May 14, 2025
Effective
June 18, 2025
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
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 reports of water leakage from the potable water system due to improperly installed waterline couplings, and water leaking into the electronics equipment (EE) bays from above the floor in the main cabin, resulting in water on the equipment in the EE bays. This AD requires an inspection of seat tracks above the EE bays for missing, damaged, or deteriorated sealant, moisture barrier tape, or tape dams, as applicable, and applicable on-condition actions. The FAA is issuing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 90 Issue 92 (Wednesday, May 14, 2025)</title>
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[Federal Register Volume 90, Number 92 (Wednesday, May 14, 2025)]
[Rules and Regulations]
[Pages 20373-20375]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2025-08346]
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Rules and Regulations
Federal Register
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having general applicability and legal effect, most of which are keyed
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Federal Register / Vol. 90, No. 92 / Wednesday, May 14, 2025 / Rules
and Regulations
[[Page 20373]]
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2024-2665; Project Identifier AD-2024-00203-T;
Amendment 39-23033; AD 2025-09-12]
RIN 2120-AA64
Airworthiness Directives; The Boeing Company Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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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 reports of water leakage from the potable water
system due to improperly installed waterline couplings, and water
leaking into the electronics equipment (EE) bays from above the floor
in the main cabin, resulting in water on the equipment in the EE bays.
This AD requires an inspection of seat tracks above the EE bays for
missing, damaged, or deteriorated sealant, moisture barrier tape, or
tape dams, as applicable, and applicable on-condition actions. The FAA
is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective June 18, 2025.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of June 18,
2025.
ADDRESSES:
AD Docket: You may examine the AD docket at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2024-2665; 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:
<bullet> 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 <a href="http://myboeingfleet.com">myboeingfleet.com</a>.
<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 <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2024-2665.
FOR FURTHER INFORMATION CONTACT: Courtney Tuck, Aviation Safety
Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone: 206-
231-3986; email: <a href="/cdn-cgi/l/email-protection#32515d4740465c574b1c591c46475159725453531c555d44"><span class="__cf_email__" data-cfemail="1d7e72686f6973786433763369687e765d7b7c7c337a726b">[email protected]</span></a>.
SUPPLEMENTARY INFORMATION:
Background
The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 to supersede AD 2016-14-04, Amendment 39-18585 (81 FR
44499, July 8, 2016) (AD 2016-14-04). AD 2016-14-04 applies to certain
The Boeing Company Model 787-8 airplanes. The NPRM published in the
Federal Register on December 26, 2024 (89 FR 104900). AD 2016-14-04 was
prompted by reports of water leakage from the potable water system due
to improperly installed waterline couplings, and water leaking into the
EE bays from above the floor in the main cabin, resulting in water on
the equipment in the EE bays. The NPRM proposing to supersede AD 2016-
14-04 was prompted by the determination that the sealant, moisture
barrier tape, and tape dam required above the EE bays may not have been
installed on production airplanes. In the NPRM, the FAA proposed to
retain the actions in AD 2016-14-04, expand the applicability to
include additional Model 787-8 airplanes and certain Model 787-9 and
787-10 airplanes, and require an inspection of seat tracks above the EE
bays for missing, damaged, or deteriorated sealant, moisture barrier
tape, or tape dams, as applicable, and applicable on-condition actions.
The FAA is issuing this AD to address the unsafe condition on these
products.
Discussion of Final Airworthiness Directive
Comments
The FAA received comments from Air Line Pilots Association,
International, and The Boeing Company, who supported the NPRM without
change.
The FAA received additional comments from The Foundation for
Aviation Safety, United Airlines, and an individual. The following
presents the comments received on the NPRM and the FAA's response to
each comment.
Request To Change NPRM to a Stand-Alone AD Action
United Airlines and an individual requested that the FAA change the
proposed AD to a new stand-alone AD that does not supersede AD 2016-14-
04. The commenters stated that the actions in the proposed AD are not
applicable to AD 2016-14-04. United Airlines further commented that
although the proposed AD would require the actions in Boeing Alert
Requirements Bulletin B787-81205-SB530085-00 RB, Issue 001, dated March
6, 2024, the effectivity of that bulletin does not include the same
Model 787-8 airplanes as those listed in AD 2016-14-04 and does not
impose any requirements for the airplanes in AD 2016-14-04.
The FAA agrees. The airplanes identified in this AD are different
than those in AD 2016-14-04, and no new actions are required for
airplanes that complied with AD 2016-14-04. Therefore, the FAA has
revised this AD to not supersede AD 2016-14-04.
Request for an Explanation of the Cause and Corrective Actions Taken in
the Factory
The Foundation for Aviation Safety requested the FAA provide a
detailed explanation of the root cause and corrective actions taken in
the factory to address the issue.
The FAA provides the following clarification. The root cause was
due to the floor panel design missing sealant and moisture barrier tape
at certain floor panels and seat tracks, because of the inadvertent
omission of sealing instructions from Boeing floor panel drawings in
2018 when build
[[Page 20374]]
requirements were consolidated into one document as part of a value
engineering project. To address these issues, Boeing revised
engineering documents, including drawings and instructions, to clearly
reinstate the sealing instructions, implemented a design review
checklist, and provided additional training to employees to ensure the
sealant was properly applied. No change to this AD is necessary as a
result of this comment.
Request To Implement Corrective Actions Immediately
The Foundation for Aviation Safety questioned the compliance time
for the new proposed actions and requested that the FAA mandate the
corrective actions to be done immediately. The Foundation for Aviation
Safety stated that the unsafe condition has been known since at least
2016, and that the proposed AD would add 64 more airplanes to the
applicability.
The FAA disagrees. Although the unsafe condition has been known
since 2016, the omission of sealant in the airplanes added to this AD
didn't occur until 2018. The new actions in this AD must be
accomplished within 5 years. In developing an appropriate compliance
time for this action, the FAA considered the recommendations of the
manufacturer, the urgency associated with the subject unsafe condition,
and the practical aspect of accomplishing the required actions within a
period of time that corresponds to the normal scheduled maintenance for
most affected operators. The sealant is one of many layers intended to
prevent water ingress into the aft EE bay, with additional layers of
protection including visual leak detection above the floor and drip
shield protection for critical equipment in the aft EE bay. The FAA
further notes that, as the FAA is no longer superseding AD 2016-14-04,
this AD now applies to only 47 U.S-registered airplanes. AD 2016-14-04
applies to 17 of the 64 airplanes identified in the NPRM. The FAA has
not changed this AD as a result of this comment.
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 and
other changes described previously, 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 Alert Requirements Bulletin B787-81205-
SB530085-00 RB, Issue 001, dated March 6, 2024. This material specifies
procedures for a detailed inspection of seat tracks located above the
aft EE bays for missing, damaged, or deteriorated sealant, moisture
barrier tape, or tape dams, as applicable, and applicable on-condition
actions. On-condition actions include applying sealant, moisture
barrier tape, and tape dams to each affected area.
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 47 airplanes of U.S.
registry. The FAA estimates the following costs to comply with this AD:
Estimated Costs
----------------------------------------------------------------------------------------------------------------
Cost on U.S.
Action Labor cost Parts cost Cost per product operators
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Inspection of floor seat track. 22 work-hours x $85 per $0 $1,870 $87,890
hour = $1,870.
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The FAA estimates the following costs to do any on-condition
actions 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 repair:
On-Condition Costs
----------------------------------------------------------------------------------------------------------------
Action Labor cost Parts cost Cost per product
----------------------------------------------------------------------------------------------------------------
Applying sealant, moisture barrier tape, 33 work-hours x $85 per hour = $350 $3,155
or tape dam. $2,805.
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The FAA has included all known costs in its cost estimate.
According to the 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
[[Page 20375]]
(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 adding the following new airworthiness
directive:
2025-09-12 The Boeing Company: Amendment 39-23033; Docket No. FAA-
2024-2665; Project Identifier AD-2024-00203-T.
(a) Effective Date
This airworthiness directive (AD) is effective June 18, 2025.
(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, as identified in
Boeing Alert Requirements Bulletin B787-81205-SB530085-00 RB, Issue
001, dated March 6, 2024.
(d) Subject
Air Transport Association (ATA) of America Code 38, water waste;
53, Fuselage.
(e) Unsafe Condition
This AD was prompted by reports of water leakage from the
potable water system due to improperly installed waterline
couplings, and water leaking into the electronics equipment (EE)
bays from above the floor in the main cabin, resulting in water on
the equipment in the EE bays. A water leak from an improperly
installed potable water system coupling, or main cabin water source,
if not addressed, could cause the equipment in the EE bays to become
wet, resulting in an electrical short and potential loss of system
functions essential for safe flight.
(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
Alert Requirements Bulletin B787-81205-SB530085-00 RB, Issue 001,
dated March 6, 2024, do all applicable actions identified in, and in
accordance with, the Accomplishment Instructions of Boeing Alert
Requirements Bulletin B787-81205-SB530085-00 RB, Issue 001, dated
March 6, 2024.
Note 1 to paragraph (g): Guidance for accomplishing the actions
required by this AD can be found in Boeing Alert Service Bulletin
B787-81205-SB530085-00, Issue 001, dated March 6, 2024, which is
referred to in Boeing Alert Requirements Bulletin B787-81205-
SB530085-00 RB, Issue 001, dated March 6, 2024.
(h) Exceptions to Requirements Bulletin Specifications
Where the Boeing Recommended Compliance Time columns of the
tables in the ``Compliance'' paragraph of Boeing Alert Requirements
Bulletin B787-81205-SB530085-00 RB, Issue 001, dated March 6, 2024,
refer to the Issue 001 date of the Requirements Bulletin B787-81205-
SB530085-00 RB, this AD requires using the effective date of this
AD.
(i) 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 certification office,
send it to the attention of the person identified in paragraph
(j)(1) of this AD. Information may be emailed to: <a href="/cdn-cgi/l/email-protection#f5b4b8bab6b5939494db929a83"><span class="__cf_email__" data-cfemail="a8e9e5e7ebe8cec9c986cfc7de">[email protected]</span></a>.
(2) Before using any approved AMOC, notify your appropriate
principal inspector, or lacking a principal inspector, the manager
of the responsible Flight Standards Office.
(3) 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.
(j) Related Information
(1) For more information about this AD, contact Courtney Tuck,
Aviation Safety Engineer, FAA, 2200 South 216th St., Des Moines, WA
98198; phone: 206-231-3986; email: <a href="/cdn-cgi/l/email-protection#3d5e52484f4953584413561349485e567d5b5c5c135a524b"><span class="__cf_email__" data-cfemail="7f1c100a0d0b111a065114510b0a1c143f191e1e51181009">[email protected]</span></a>.
(2) Material identified in this AD that is not incorporated by
reference is available at the address specified in paragraph (k)(3)
of this AD.
(k) 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 Alert Requirements Bulletin B787-81205-SB530085-00
RB, Issue 001, dated March 6, 2024.
(ii) [Reserved]
(3) For the 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 <a href="http://myboeingfleet.com">myboeingfleet.com</a>.
(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 <a href="http://www.archives.gov/federal-register/cfr/ibr-locations">www.archives.gov/federal-register/cfr/ibr-locations</a> or email <a href="/cdn-cgi/l/email-protection#9ff9edb1f6f1eceffafcebf6f0f1dff1feedfeb1f8f0e9"><span class="__cf_email__" data-cfemail="fb9d89d59295888b9e988f929495bb959a899ad59c948d">[email protected]</span></a>.
Issued on April 30, 2025.
Victor Wicklund,
Deputy Director, Integrated Certificate Management Division, Aircraft
Certification Service.
[FR Doc. 2025-08346 Filed 5-13-25; 8:45 am]
BILLING CODE 4910-13-P
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