Airworthiness directives › 2023-19-09
AD 2023-19-09 Airworthiness Directives; The Boeing Company Airplanes
Models named: 787-8, 787-9, 787-10. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to all The Boeing Company Model 787-8, 787-9, and 787-10 airplanes, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
This paragraph restates the requirements of paragraph (g) of AD 2020-24-04, with new terminating action and revised affected airplanes. For airplanes on which Common Block Point (CBP) 5.1, 27 Flight Control Module (FCM) Operational Program Software (OPS) part number HNP5A-AL01-5041 or later approved software part number is not installed on FCM-L, FCM-C, and FCM-R: Within 14 days after December 18, 2020 (the effective date of AD 2020-24-04), 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. Installing the software required by paragraph (h) of this AD terminates the requirement for revising the existing AFM in this paragraph. EN02OC23.003
Unsafe condition
This 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 (CFIT). This AD was further prompted by reports of misleading vertical flight director guidance that in certain scenarios can be presented to the flightcrew during approach and could lead to CFIT or a runway overrun.
Affected ADs
This AD replaces AD 2020-24-04, Amendment 39-21334 (85 FR 77991, December 3, 2020; corrected December 14, 2020 (85 FR 80589)) (AD 2020-24-04).
Read the original on the Federal Register →
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1