AD 2019-20-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
A potential condition in which the leading edge outboard slat system could be out of position without flight deck annunciation, which could result in insufficient lift, resulting in inability to maintain continued safe flight and landing.
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Required Actions
Accomplish the actions identified in Boeing Alert Requirements Bulletin B787-81205-SB270051-00 RB, Issue 001, dated July 5, 2019, except for any differences identified as exceptions in the regulatory text of this AD. This includes repetitive operational checks of the leading edge outboard slats and applicable on-condition actions. On-condition actions include making sure fault messages are cleared (using fault isolation manual (FIM) procedures), making sure leading edge outboard slats extend and fully retract, and operational checks of the leading edge outboard slats in primary, secondary, and alternate modes. Additionally, revise the airplane flight manual (AFM) to prohibit flap retraction under icing conditions and revise the existing maintenance or inspection program, as applicable, to incorporate a new operation check.
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Compliance Time
Within 30 days of the effective date of this AD
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Affected Aircraft
The Boeing Company Model 787-8, 787-9, and 787-10 airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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