AD 90-25-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-81 (MD-81) | Airworthiness Directives; McDONNELL DOUGLAS DC-9-80 Series Airplanes and Model MD-88 Airplanes |
| aircraft | The Boeing Company | DC-9-82 (MD-82) | Airworthiness Directives; McDONNELL DOUGLAS DC-9-80 Series Airplanes and Model MD-88 Airplanes |
| aircraft | The Boeing Company | DC-9-83 (MD-83) | Airworthiness Directives; McDONNELL DOUGLAS DC-9-80 Series Airplanes and Model MD-88 Airplanes |
| aircraft | The Boeing Company | DC-9-87 (MD-87) | Airworthiness Directives; McDONNELL DOUGLAS DC-9-80 Series Airplanes and Model MD-88 Airplanes |
| aircraft | The Boeing Company | MD-88 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-80 Series Airplanes and Model MD-88 Airplanes |
Unsafe Condition
Loss of spoilers in the speed brake mode and flap/slat control due to the in-flight spoiler lockout mechanism failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Deactivate the in-flight spoiler lockout mechanism within 30 days after the effective date. Inspect mounting brackets to determine part number; replace aluminum brackets (P/N 3962598-1NC) with stainless steel brackets (P/N 3962598-1A) if found. Special flight permits may be obtained under FAR 21.197 and 21.199.
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Compliance Time
Within 30 days after the effective date of this AD
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Affected Aircraft
McDonnell Douglas DC-9-80 series airplanes and Model MD-88 airplanes with Fuselage Numbers 1606, 1620, 1623, 1624, 1626, 1632, 1645, 1656, 1657, 1715, 1716, 1732, 1741, and 1746 through 1786.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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