AD 2018-23031
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier, Inc., Airplanes |
Unsafe Condition
Cracked and corroded barrel nuts found at the mid-spar location of the horizontal-stabilizer-to-vertical-stabilizer attachment joint, which could compromise the structural integrity of the vertical-stabilizer attachment joints and lead to loss of control of the airplane.
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Required Actions
Repetitive detailed inspections of each barrel nut and cradle, a check of the bolt torque of the preload indicating (PLI) washers, and corrective actions if necessary. Modifying the airplane by installing a sealing disk to a certain location and replacing certain barrel nuts.
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Compliance Time
Before further flight
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Affected Aircraft
Bombardier, Inc., Model DHC-8-400 series airplanes, with certain barrel nuts and cradles.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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