Proposed Rule2026-05327

Airworthiness Directives; The Boeing Company Airplanes

Primary source

Metadata and text below are from the Federal Register, a public-domain U.S. government work. Always verify the official published version before relying on it for any legal matter.

Published
March 18, 2026

Issuing agencies

Transportation DepartmentFederal Aviation Administration

Abstract

The FAA proposes to supersede Airworthiness Directive (AD) 2019-20-07, which applies to all The Boeing Company Model 787-8, 787-9, and 787-10 airplanes. AD 2019-20-07 requires repetitive operational checks of the leading edge (LE) outboard (OB) slats and applicable on- condition actions. AD 2019-20-07 also requires revising the airplane flight manual (AFM) to prohibit flap retraction under icing conditions and revising the existing maintenance or inspection program, as applicable, to incorporate a new operation check. Since the FAA issued AD 2019-20-07, the manufacturer developed further actions to address the unsafe condition. This proposed AD would retain all requirements of AD 2019-20-07 and would require replacing the LE outboard geared rotary actuator (GRA) with a LE outboard lockout actuator (LEOLA) at leading edge OB slat locations and revising the existing maintenance or inspection program, as applicable, to incorporate a new certification maintenance requirement (CMR). This proposed AD would also remove airplanes from the applicability. The FAA is proposing this AD to address the unsafe condition on these products.

Full Text

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<title>Federal Register, Volume 91 Issue 52 (Wednesday, March 18, 2026)</title>
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[Federal Register Volume 91, Number 52 (Wednesday, March 18, 2026)]
[Proposed Rules]
[Pages 12942-12951]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2026-05327]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2026-2712; Project Identifier AD-2025-00931-T]
RIN 2120-AA64


Airworthiness Directives; The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: The FAA proposes to supersede Airworthiness Directive (AD) 
2019-20-07, which applies to all The Boeing Company Model 787-8, 787-9, 
and 787-10 airplanes. AD 2019-20-07 requires repetitive operational 
checks of the leading edge (LE) outboard (OB) slats and applicable on-
condition actions. AD 2019-20-07 also requires revising the airplane 
flight manual (AFM) to prohibit flap retraction under icing conditions 
and revising the existing maintenance or inspection program, as 
applicable, to incorporate a new operation check. Since the FAA issued 
AD 2019-20-07, the manufacturer developed further actions to address 
the unsafe condition. This proposed AD would retain all requirements of 
AD 2019-20-07 and would require replacing the LE outboard geared rotary 
actuator (GRA) with a LE outboard lockout actuator (LEOLA) at leading 
edge OB slat locations and revising the existing maintenance or 
inspection program, as applicable, to incorporate a new certification 
maintenance requirement (CMR). This proposed AD would also remove 
airplanes from the applicability. The FAA is proposing this AD to 
address the unsafe condition on these products.

DATES: The FAA must receive comments on this proposed AD by May 4, 
2026.

ADDRESSES: You may send comments, using the procedures found in 14 CFR 
11.43 and 11.45, by any of the following methods:
    <bullet> Federal eRulemaking Portal: Go to <a href="http://regulations.gov">regulations.gov</a>. Follow 
the instructions for submitting comments.
    <bullet> Fax: 202-493-2251.
    <bullet> Mail: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue SE, Washington, DC 20590.
    <bullet> Hand Delivery: Deliver to Mail address above between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.

[[Page 12943]]

    AD Docket: You may examine the AD docket at <a href="http://regulations.gov">regulations.gov</a> under 
Docket No. FAA-2026-2712; 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 NPRM, any comments received, and other 
information. The street address for Docket Operations is listed above.
    Material Incorporated by Reference:
    <bullet> For Boeing material identified in this proposed 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-2026-2712.

FOR FURTHER INFORMATION CONTACT: Emanuel Chaves Torres, Aviation Safety 
Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone: 562-
627-5350; email: <a href="/cdn-cgi/l/email-protection#2a4f474b445f4f460449424b5c4f59045e4558584f596a4c4b4b044d455c"><span class="__cf_email__" data-cfemail="53363e323d26363f7d303b322536207d273c21213620133532327d343c25">[email&#160;protected]</span></a>.

SUPPLEMENTARY INFORMATION:

Comments Invited

    The FAA invites you to send any written relevant data, views, or 
arguments about this proposal. Send your comments using a method listed 
under the ADDRESSES section. Include ``Docket No. FAA-2026-2712; 
Project Identifier AD-2025-00931-T'' at the beginning of your comments. 
The most helpful comments reference a specific portion of the proposal, 
explain the reason for any recommended change, and include supporting 
data. The FAA will consider all comments received by the closing date 
and may amend this proposal because of those comments.
    Except for Confidential Business Information (CBI) as described in 
the following paragraph, and other information as described in 14 CFR 
11.35, the FAA will post all comments received, without change, to 
<a href="http://regulations.gov">regulations.gov</a>, including any personal information you provide. The 
agency will also post a report summarizing each substantive verbal 
contact received about this NPRM.

Confidential Business Information

    CBI is commercial or financial information that is both customarily 
and actually treated as private by its owner. Under the Freedom of 
Information Act (FOIA) (5 U.S.C. 552), CBI is exempt from public 
disclosure. If your comments responsive to this NPRM contain commercial 
or financial information that is customarily treated as private, that 
you actually treat as private, and that is relevant or responsive to 
this NPRM, it is important that you clearly designate the submitted 
comments as CBI. Please mark each page of your submission containing 
CBI as ``PROPIN.'' The FAA will treat such marked submissions as 
confidential under the FOIA, and they will not be placed in the public 
docket of this NPRM. Submissions containing CBI should be sent to 
Emanuel Chaves Torres, Aviation Safety Engineer, FAA, 2200 South 216th 
St., Des Moines, WA 98198; phone: 562-627-5350; email: 
<a href="/cdn-cgi/l/email-protection#16737b777863737a38757e77607365386279646473655670777738717960"><span class="__cf_email__" data-cfemail="1a7f777b746f7f763479727b6c7f69346e7568687f695a7c7b7b347d756c">[email&#160;protected]</span></a>. Any commentary that the FAA receives 
that is not specifically designated as CBI will be placed in the public 
docket for this rulemaking.

Background

    The FAA issued AD 2019-20-07, Amendment 39-19760 (84 FR 54765, 
October 11, 2019) (AD 2019-20-07), for all The Boeing Company Model 
787-8, 787-9, and 787-10 airplanes. AD 2019-20-07 was prompted by a 
determination that the LE OB slat system could be out of position 
without flight deck annunciation. AD 2019-20-07 requires repetitive 
operational checks of the LE OB slats and applicable on-condition 
actions. AD 2019-20-07 also requires revising the AFM to prohibit flap 
retraction under icing conditions and revising the existing maintenance 
or inspection program, as applicable, to incorporate a new operation 
check. The agency issued AD 2019-20-07 to address a potential condition 
in which the LE OB slat system could be out of position without flight 
deck annunciation. This condition, if not addressed, could result in 
insufficient lift, resulting in inability to maintain continued safe 
flight and landing.

Actions Since AD 2019-20-07 Was Issued

    The preamble to AD 2019-20-07 specifies that the FAA considers that 
AD ``interim action'' and that the FAA may consider further rulemaking. 
Since the FAA issued AD 2019-20-07, the manufacturer has developed 
final actions to address the unsafe condition. The FAA has determined 
that these final actions must be required to address the unsafe 
condition and that accomplishing the final actions will terminate the 
requirements of AD 2019-20-07. The manufacturer has also incorporated 
these final actions on airplanes in production, which reduces the 
number of airplanes that would be affected by the unsafe condition.

FAA's 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.

Material Incorporated by Reference Under 1 CFR Part 51

    The FAA reviewed Boeing Alert Requirements Bulletin B787-81205-
SB270055-00 RB, Issue 002, dated November 25, 2024. This material 
specifies procedures for replacing the LE outboard GRA with a LEOLA at 
leading edge slat 2 and slat 11 outboard locations and revising the 
operator's maintenance program to incorporate CMR document item 27-CMR-
14, ``Functionally check the Leading Edge Power Drive Unit Half System 
Torque Brake.''
    This proposed AD would also require Boeing Alert Requirements 
Bulletin B787-81205-SB270051-00 RB, Issue 001, dated July 5, 2019, 
which the Director of the Federal Register approved for incorporation 
by reference as of October 11, 2019 (84 FR 54765, October 11, 2019).
    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.

Proposed AD Requirements in This NPRM

    This proposed AD would retain all requirements of AD 2019-20-07. 
This proposed AD would remove airplanes from the applicability by 
specifying affected line numbers and require new actions that would 
terminate the requirements of AD 2019-20-07. This proposed AD would 
also require accomplishing the actions specified in the material 
already described, except for any differences identified as exceptions 
in the regulatory text of this proposed AD.
    For information on the procedures and compliance times, see this 
material at <a href="http://regulations.gov">regulations.gov</a> under Docket No. FAA-2026-2712.

Costs of Compliance

    The FAA estimates that this AD, if adopted as proposed, would 
affect 174 airplanes of U.S. registry. The FAA estimates the following 
costs to comply with this proposed AD:

[[Page 12944]]



                                                Estimated Costs *
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                                                                                                Cost on U.S.
              Action                    Labor cost        Parts cost    Cost per product          operators
----------------------------------------------------------------------------------------------------------------
Repetitive operational checks      8 work-hours x $85             $0  $680 per operational  $118,320 per
 (retained actions from AD 2019-    per hour = $680 per                check.                operational check.
 20-07).                            operational check.
AFM revision (retained action      1 work-hour x $85               0  $85.................  $14,790.
 from AD 2019-20-07).               per hour = $85.
Replacement (new proposed action)  9 work-hours x $85         31,610  $32,375.............  $5,633,250.
                                    per hour = $765.
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* Table does not include estimated costs for revising the existing maintenance or inspection program.

    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. Therefore, the agency estimates the average total cost per 
operator to be $7,650 (90 work-hours x $85 per work-hour).
    The FAA has included all known costs in its cost estimate. 
According to the manufacturer, however, some or all of the costs of 
this proposed 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

    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:
    (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.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

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 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) 2019-20-07, Amendment 39-19760 
(84 FR 54765, October 11, 2019), and
0
b. Adding the following new AD:

The Boeing Company: Docket No. FAA-2026-2712; Project Identifier AD-
2025-00931-T.

(a) Comments Due Date

    The FAA must receive comments on this airworthiness directive 
(AD) by May 4, 2026.

(b) Affected ADs

    This AD replaces AD 2019-20-07, Amendment 39-19760 (84 FR 54765, 
October 11, 2019) (AD 2019-20-07).

(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-SB270055-00 RB, Issue 
002, dated November 25, 2024.

(d) Subject

    Air Transport Association (ATA) of America Code 27, Flight 
Controls.

(e) Unsafe Condition

    This AD was prompted by a determination that the leading edge 
(LE) outboard (OB) slat system could be out of position without 
flight deck annunciation. The FAA is issuing this AD to address a 
potential condition in which the LE OB slat system could be out of 
position without flight deck annunciation. The unsafe condition, if 
not addressed, could result in insufficient lift, resulting in 
inability to maintain continued safe flight and landing.

(f) Compliance

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

(g) Retained Required Actions, With No Changes

    This paragraph restates the requirements of paragraph (g) of AD 
2019-20-07, with no changes. 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-SB270051-
00 RB, Issue 001, dated July 5, 2019, do all applicable actions 
identified in, and in accordance with, the Accomplishment 
Instructions of Boeing Alert Requirements Bulletin B787-81205-
SB270051-00 RB, Issue 001, dated July 5, 2019.
    Note 1 to paragraph (g): Guidance for accomplishing the actions 
required by this AD can be found in Boeing Alert Service Bulletin 
B787-81205-SB270051-00, Issue 001, dated July 5, 2019, which is 
referred to in Boeing Alert Requirements Bulletin B787-81205-
SB270051-00 RB, Issue 001, dated July 5, 2019.

(h) Retained Exception to Service Information Specifications, With No 
Changes

    This paragraph restates the requirements of paragraph (h) of AD 
2019-20-07, with no changes. For purposes of determining compliance 
with the requirements of this AD: Where Boeing Alert Requirements 
Bulletin B787-81205-SB270051-00 RB, Issue 001, dated July 5, 2019, 
uses the phrase ``the Issue 001 date of Requirements Bulletin B787-
81205-SB270051-00 RB,'' this AD requires using ``October 11, 2019'' 
(the effective date of AD 2019-20-07).

[[Page 12945]]

(i) Retained Airplane Flight Manual (AFM) Revision To Prohibit Flap 
Retraction Under Icing Conditions, With No Changes

    This paragraph restates the requirements of paragraph (i) of AD 
2019-20-07, with no changes. Within 60 days after October 11, 2019 
(the effective date of AD 2019-20-07), revise the Limitations 
Section of the existing AFM to include the information in figure 1 
to paragraph (i) of this AD. This may be done by inserting a copy of 
figure 1 to paragraph (i) of this AD into the Limitations Section of 
the existing AFM.

Figure 1 to Paragraph (i): AFM Revision
[GRAPHIC] [TIFF OMITTED] TP18MR26.013

(j) Retained Maintenance or Inspection Program Revision To Incorporate 
a New Operation Check, With No Changes

    This paragraph restates the requirements of paragraph (j) of AD 
2019-20-07, with no changes. Within 60 days after October 11, 2019 
(the effective date of AD 2019-20-07), revise the existing 
maintenance or inspection program, as applicable, to incorporate the 
information specified in figure 2 to paragraph (j) of this AD. This 
may be done by inserting a copy of figure 2 to paragraph (j) of this 
AD into the existing maintenance or inspection program.
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Figure 2 To Paragraph (j): Maintenance or Inspection Program Revision

[[Page 12946]]

[GRAPHIC] [TIFF OMITTED] TP18MR26.014


[[Page 12947]]


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[GRAPHIC] [TIFF OMITTED] TP18MR26.018

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(k) Retained No Alternative Actions or Intervals, With No Changes

    This paragraph restates the requirements of paragraph (k) of AD 
2019-20-07, with no changes. After the existing maintenance or 
inspection program has been revised as required by paragraph (j) of 
this AD, no alternative actions (e.g., inspections) or intervals may 
be used unless the actions or intervals are approved as an 
alternative method of compliance (AMOC) in accordance with the 
procedures specified in paragraph (p) of this AD.

(l) New Required Actions

    Except as specified by paragraph (i) of this AD: At the 
applicable times specified in the ``Compliance'' paragraph of Boeing 
Alert Requirements Bulletin B787-81205-SB270055-00 RB, Issue 002, 
dated November 25, 2024, do all applicable actions identified in, 
and in accordance with, the Accomplishment Instructions of Boeing 
Alert Requirements Bulletin B787-81205-SB270055-00 RB, Issue 002, 
dated November 25, 2024.
    Note 2 to paragraph (l): Guidance for accomplishing the actions 
required by this AD can be found in Boeing Alert Service Bulletin 
B787-81205-SB270055-00, Issue 002, dated November 25, 2024, which is

[[Page 12951]]

referred to in Boeing Alert Requirements Bulletin B787-81205-
SB270055-00 RB, Issue 002, dated November 25, 2024.

(m) Terminating Action

    Accomplishing the actions required by paragraph (l) of this AD 
terminates the requirements of paragraphs (g), (i), and (j) of this 
AD for that airplane. After all affected airplanes in an operator's 
fleet have complied with paragraph (l) of this AD, the AFM revision 
required by paragraph (i) of this AD may be removed and the 
maintenance or inspection program revision required by paragraph (j) 
of this AD may be removed.

(n) Exceptions to Requirements Bulletin Specifications

    Where the Compliance Time column of the tables in the 
``Compliance'' paragraph of Boeing Alert Requirements Bulletin B787-
81205-SB270055-00 RB, Issue 002, dated November 25, 2024, refers to 
the Issue 001 date of Requirements Bulletin B787-81205-SB270055-00 
RB, this AD requires using the effective date of this AD.

(o) Credit for Previous Actions

    This paragraph provides credit for the actions specified in 
paragraph (l) of this AD, if those actions were performed before the 
effective date of this AD using Boeing Alert Requirements Bulletin 
B787-81205-SB270055-00 RB, Issue 001, dated December 12, 2023.

(p) 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 (q)(1) of this AD. Information may be emailed to: 
<a href="/cdn-cgi/l/email-protection#23626e6c60634542420d444c55"><span class="__cf_email__" data-cfemail="5d1c10121e1d3b3c3c733a322b">[email&#160;protected]</span></a>. 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.
    (3) AMOCs approved for AD 2019-20-07 are approved as AMOCs for 
the corresponding provisions of paragraphs (g), (i), and (j) of this 
AD.

(q) Additional Information

    (1) For more information about this AD, contact Emanuel Chaves 
Torres, Aviation Safety Engineer, FAA, 2200 South 216th St., Des 
Moines, WA 98198; phone: 562-627-5350; email: 
<a href="/cdn-cgi/l/email-protection#92f7fff3fce7f7febcf1faf3e4f7e1bce6fde0e0f7e1d2f4f3f3bcf5fde4"><span class="__cf_email__" data-cfemail="1c79717d72697970327f747d6a796f3268736e6e796f5c7a7d7d327b736a">[email&#160;protected]</span></a>.
    (2) Material identified in this AD that is not incorporated by 
reference is available at the address specified in paragraph (r)(5) 
of this AD.

(r) 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 this AD specifies otherwise.
    (3) The following material was approved for IBR on [DATE 35 DAYS 
AFTER PUBLICATION OF THE FINAL RULE].
    (i) Boeing Alert Requirements Bulletin B787-81205-SB270055-00 
RB, Issue 002, dated November 25, 2024.
    (ii) [Reserved]
    (4) The following material was approved for IBR on October 11, 
2019 (84 FR 54765, October 11, 2019).
    (i) Boeing Alert Requirements Bulletin B787-81205-SB270051-00 
RB, Issue 001, dated July 5, 2019.
    (ii) [Reserved]
    (5) 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>.
    (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 <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#2046520e494e5350454354494f4e604e4152410e474f56"><span class="__cf_email__" data-cfemail="b2d4c09cdbdcc1c2d7d1c6dbdddcf2dcd3c0d39cd5ddc4">[email&#160;protected]</span></a>.

    Issued on March 12, 2026.
Lona C. Saccomando,
Acting Deputy Director, Integrated Certificate Management Division, 
Aircraft Certification Service.
[FR Doc. 2026-05327 Filed 3-17-26; 8:45 am]
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