AD 2004-12-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aerospatiale | Model ATR42-500 and ATR72-212A Series | Airworthiness Directives; Aerospatiale Model ATR42-500 and ATR72-212A Series Airplanes |
Unsafe Condition
Cracking of the upper closing rib of the vertical fin could result in interference between the upper closing rib and the rudder, leading to a rudder jam and reduced controllability of the airplane.
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Required Actions
Perform a detailed inspection for cracking of the upper closing rib of the vertical fin within 500 flight hours after the effective date, and repeat the inspection every 500 flight hours. Measure the planarity of the upper closing rib and the gap between the rudder horn and the upper closing rib before further flight following the initial inspection. Repair any cracks or anomalies found, using an approved method.
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Compliance Time
Within 500 flight hours after the effective date
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Affected Aircraft
Aerospatiale Model ATR42-500 and ATR72-212A series airplanes, certificated in any category, on which Aerospatiale Modification 4440 has been accomplished, except specific serial numbers as noted in the AD.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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