AD 91-14-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Saab AB, Saab Aerosystems | SAAB 340B | Airworthiness Directives; SAAB-SCANIA Model SF-340A and SAAB 340B Series Airplanes |
| aircraft | Saab AB, Saab Aerosystems | 340A (SAAB SF340A) | Airworthiness Directives; SAAB-SCANIA Model SF-340A and SAAB 340B Series Airplanes |
Unsafe Condition
Cracking in the vertical stabilizer top closure rib could cause inhibited airplane rudder control.
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Required Actions
Inspect the vertical stabilizer top closure rib for cracking in accordance with SAAB Service Bulletin 340-55-022, Revision 1. If no cracking is found, reinspect at intervals not exceeding 500 flight hours. If cracking is found, stop drill the cracks, blend, clean, apply aluminum tape as specified, and reinspect at intervals not exceeding 100 hours. Replace the rib with a new thicker rib or reinforce and replace the attachment angle per SAAB Service Bulletin 340-55-023 within one year after this amendment's effective date.
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Compliance Time
Prior to the accumulation of 500 hours time-in-service since new or within 100 hours time-in-service after August 30, 1990 (the effective date of Amendment 39-6676, AD 90-16-02), whichever occurs later. Additionally, within one year after the effective date of this amendment for the replacement or reinforcement requirement.
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Affected Aircraft
SAAB-SCANIA Model SF-340A series airplanes, Serial Numbers 031 through 159; and SAAB 340B series airplanes, Serial Numbers 160 through 186.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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