AD 99-19-21
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Saab AB, Saab Aerosystems | SAAB 340B | Airworthiness Directives; Saab Model SAAB SF340A and SAAB 340B Series Airplanes |
| aircraft | Saab AB, Saab Aerosystems | 340A (SAAB SF340A) | Airworthiness Directives; Saab Model SAAB SF340A and SAAB 340B Series Airplanes |
Unsafe Condition
Failure of the front spar due to fatigue cracking around certain fastener holes of the front spar of the horizontal stabilizers, which could result in reduced structural integrity of the airplane.
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Required Actions
Perform detailed visual, eddy current, and x-ray inspections to detect cracking around fastener holes and adjacent areas of the horizontal stabilizers' front spar. Cold work certain fastener holes and install new fasteners as corrective actions. Repeat inspections at intervals not exceeding 12,000 flight cycles until new fasteners are installed.
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Compliance Time
Within specified flight cycles after the effective date (October 20, 1999), depending on total flight cycles accumulated as of that date.
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Affected Aircraft
Saab Model SAAB SF340A (serials -004 to -159) and SAAB 340B (serials -160 to -439) airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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