- Effective
- December 18, 2020
- Published
- December 3, 2020 · 85 FR 77991–77994
- Issued
- November 13, 2020
- Superseded by
- AD2023-19-09
- Models
- 787-10, 787-8, 787-9
- Data sheet
- TCDST00021SE
- Registered aircraft
- 214 matched by model
- Product
- Aircraft · Large airplane
- ATA chapter
- 22 · Auto flight
- Amendment
- 39-21334
- Docket
- FAA-2020-1031
- Project
- AD-2020-00846-T
- Issued as
- Final rule; request for comments
Unofficial copy from the Federal Register XML, document 2020-26680. Only the govinfo PDF is the legal edition. DRS record last changed November 21, 2025.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
| File | Size | SHA-256 | Original |
|---|---|---|---|
| Official PDF | 272 KB | dcf73a12…b5c3fa8 | 2020-26680.pdf on govinfo.gov |
| Official PDF | 259 KB | 1aea8388…dbf21e8 | 2020-27507.pdf on govinfo.gov |
| Federal Register XML | 20 KB | 4bf7031f…0f561d3 | 2020-26680.xml on federalregister.gov |
| Federal Register XML | 11 KB | 1d895216…0f4057b | 2020-27507.xml on federalregister.gov |
| FAA DRS PDF attachment | 686 KB | a62574a5…f237e8f | FAA DRS (API key needed) |
| FAA DRS HTML attachment | 62 KB | dc8cabe7…575e0a4 | FAA DRS (API key needed) |
| FAA DRS PDF | 478 KB | 102f479f…0e1a952 | FAA DRS (API key needed) |
On this page
Summary
The FAA is correcting an airworthiness directive (AD) that published in the Federal Register. That AD applies to all The Boeing Company Model 787-8, 787-9, and 787-10 airplanes. As published, the regulatory text of the AD included errors in certain references to the airplane flight manual (AFM) that is required to be revised. This document corrects those errors. In all other respects, the original document remains the same.
The airworthiness directive
2020-24-04 The Boeing Company: Amendment 39-21334; Docket No. FAA-2020-1031; Project Identifier AD-2020-00846-T.
(a) Effective Date
PDF page 1This AD is effective December 18, 2020.
(b) Affected ADs
PDF page 1None.
(c) Applicability
PDF page 2This AD applies to all The Boeing Company Model 787-8, 787-9, and 787-10 airplanes, certificated in any category.
(d) Subject
PDF page 2Air Transport Association (ATA) of America Code 22, Auto flight.
(e) Unsafe Condition
PDF page 2This AD was prompted by reports indicating that the autopilot flight director system (AFDS) failed to transition to the instrument landing system localizer (LOC) beam after the consistent localizer capture function in the flight control modules initiated a transition to capture LOC during approach. The FAA is issuing this AD to address the AFDS failing to transition, which could result in localizer overshoot leading to glideslope descent on the wrong heading. Combined with a lack of flight deck effects for a consistent localizer capture mode failure, this condition could result in a controlled flight into terrain.
(f) Compliance
PDF page 2Comply with this AD within the compliance times specified, unless already done.
(g) Revise the Airplane Flight Manual (AFM)
PDF page 2Within 14 days after the effective date of this AD, revise the Operating Procedures chapter of the existing AFM and applicable corresponding operational procedures to incorporate the procedures specified in figure 1 to paragraph (g) of this AD. Revising the existing AFM to include the changes specified in paragraph (g) of this AD may be done by inserting a copy of figure 1 to paragraph (g) of this AD into the existing AFM.
[graphic omitted; see the official PDF]
(h) Alternative Methods of Compliance (AMOCs)
PDF page 2(1) The Manager, Seattle 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 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 (i) of this AD. Information may be emailed to: 9-ANM-Seattle-ACO-AMOC-Requests@faa.gov.
(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, Seattle ACO 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.
(i) Related Information
PDF page 2For more information about this AD, contact Frank Carreras, Aerospace Engineer, Systems and Equipment Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des Moines, WA 98198; phone and fax: 206-231-3539; email: frank.carreras@faa.gov.
(j) Material Incorporated by Reference
PDF page 2None.
Rule preamble
The FAA’s background, reasoning and cost estimate, published with the AD.
DatesPage 1
This correction is effective December 18, 2020. The effective date of AD 2020-24-04 remains December 18, 2020.
AddressesPage 1
You may examine the AD docket at https://www.regulations.gov; or in person at the Docket Management Facility 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 contactPage 1
Frank Carreras, Aerospace Engineer, Systems and Equipment Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des Moines, WA 98198; phone and fax: 206-231-3539; email: frank.carreras@faa.gov.
Supplementary informationPage 1
As published, Airworthiness Directive 2020-24-04, Amendment 39-21334 (85 FR 77991, December 3, 2020), requires revising the existing AFM to incorporate procedures for conducting an approach with a localizer-based navigation aid, monitoring localizer raw data, calling out any significant deviations, and performing an immediate go around if the airplane has not intercepted the final approach course as shown by the localizer deviation. AD 2020-24-04 applies to all The Boeing Company Model 787-8, 787-9, and 787-10 airplanes.
As published, the regulatory text included errors in certain references to the AFM that is required to be revised. The location of the AFM text to be revised is incorrectly identified as the “Limitations section”; the correct location is the “Operating Procedures chapter.” In addition, the figure incorrectly identified the heading of the AFM text as “Operating Instructions”; the correct heading is “Autopilot Flight Director System—Operating Instructions.”
Correction of PublicationPage 1
This document corrects an error and correctly adds the AD as an amendment to 14 CFR 39.13. Although no other part of the preamble or regulatory information has been corrected, the FAA is publishing the entire rule in the Federal Register.
The effective date of this AD remains December 18, 2020.
Since this action only corrects errors in certain AFM references, it has no adverse economic impact and imposes no additional burden on any person. Therefore, the FAA has determined that notice and public comment procedures are unnecessary.
Adoption of the CorrectionPage 1
Accordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Administration amends part 39 of the Federal Aviation Regulations (14 CFR part 39) as follows:
Adoption of the amendmentPage 1
1. The authority citation for part 39 continues to read as follows:
2. The FAA amends § 39.13 by adding the following new airworthiness directive (AD):
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 214
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 2010 | 2 |
|---|---|
| 2012 | 6 |
| 2013 | 5 |
| 2014 | 13 |
| 2015 | 30 |
| 2016 | 17 |
| 2017 | 20 |
| 2018 | 12 |
| 2019 | 10 |
| 2020 | 16 |
| 2021 | 3 |
| 2022 | 15 |
| 2023 | 7 |
| 2024 | 6 |
| 2025 | 22 |
| 2026 | 12 |
18 with no year recorded