AD 2005-20-25
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna | Aircraft Company Models 401 | Airworthiness Directives; The Cessna Aircraft Company Models 401, 401A, 401B, 402, 402A, 402B, 402C, 404, 411, 411A, 414, 414A, 421, 421A, 421B, 421C, 425, and 441 Airplanes |
Unsafe Condition
Failure of the avionics bus circuit breaker switch, which could result in smoke and a burning smell in the cockpit, leading to reduced ability to control the airplane.
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Required Actions
Inspect the avionics bus circuit breaker switch to determine the date code. Replace any switch without a date code. Implement a 1,000-hour safe life limit for switches with a date code earlier than 0434.
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Compliance Time
Within 12 months of effective date
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Affected Aircraft
The Cessna Aircraft Company Models 401, 401A, 401B, 402, 402A, 402B, 402C, 404, 411, 411A, 414, 414A, 421, 421A, 421B, 421C, 425, and 441 airplanes equipped with certain avionics bus circuit breaker switches (part numbers CM3589-50, 593-250-101, 593-250-102, W31-X2M5A-50, or W31-X1000-50).
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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