AD 97-21-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | EADS CASA | CN-235 | Airworthiness Directives; CASA Model CN-235 Airplanes |
| aircraft | EADS CASA | CN-235-100 | Airworthiness Directives; CASA Model CN-235 Airplanes |
| aircraft | EADS CASA | CN-235-200 | Airworthiness Directives; CASA Model CN-235 Airplanes |
Unsafe Condition
Failure of the elevator and/or rudder assemblies due to stress corrosion cracking in the torsion tubes and fittings, which could result in loss of control of the elevator and/or rudder.
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Required Actions
Conduct a visual inspection of the torsion tubes on the elevator and rudder assemblies to detect stress corrosion cracking per CASA Service Bulletins. If cracking is found, replace cracked parts with new original design parts or newly-designed parts as specified, and repeat inspections at intervals. Replace all original design parts with newly-designed parts within 2 years after the effective date.
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Compliance Time
Prior to further flight if cracking is detected. For airplanes with over 600 hours or 1,000 landings as of the effective date: within 50 hours time-in-service, 100 landings, or 3 months after the effective date. For others: within 600 hours, 1,000 landings, or 6 months after the effective date. Final replacement of original parts required within 2 years after the effective date.
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Affected Aircraft
CASA Model CN-235, CN-235-100, CN-235-200 airplanes listed in CASA Service Bulletins SB-235-27-05 (non-military) and SB-235-27-05M (military), certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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