AD 96-08-06
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
Cracks of the nose rib of the rudder due to vibration-related stress, which could result in deformation of the nose rib and friction and jamming between the fin and the rudder, leading to reduced controllability of the airplane.
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Required Actions
Perform a visual and dye penetrant inspection for cracks of the nose rib of the rudder. If minor cracks (less than 25.4 mm) are found, stop drill and blend them before further flight. If extensive cracks (≥25.4 mm) are detected, replace the nose rib with a new one and reinforce it. Repeat inspections at intervals not exceeding 800 flight hours or terminate with replacement and reinforcement as per Saab Service Bulletin 340-55-032.
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Compliance Time
Prior to the accumulation of 2,400 total flight hours, or within 800 flight hours after the effective date of this AD, whichever occurs later.
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Affected Aircraft
Saab Model SAAB SF340A series airplanes with serial numbers 004 through 159 inclusive, and Model SAAB 340B with serial numbers 160 through 369 inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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