AD 98-04-38
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | 500 | Airworthiness Directives; Cessna Model 500, 501, 550, 551, and 560 Series Airplanes |
| aircraft | Cessna Aircraft Company | 501 | Airworthiness Directives; Cessna Model 500, 501, 550, 551, and 560 Series Airplanes |
| aircraft | Cessna Aircraft Company | 550 | Airworthiness Directives; Cessna Model 500, 501, 550, 551, and 560 Series Airplanes |
| aircraft | Cessna Aircraft Company | 551 | Airworthiness Directives; Cessna Model 500, 501, 550, 551, and 560 Series Airplanes |
| aircraft | Cessna Aircraft Company | 560 | Airworthiness Directives; Cessna Model 500, 501, 550, 551, and 560 Series Airplanes |
Unsafe Condition
Severe icing conditions outside certification parameters may result in ice accumulation exceeding ice protection system capability or forming aft of protected surfaces, degrading performance and controllability.
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Required Actions
Revise AFM Limitations Section to include severe icing visual cues and procedures, including requesting priority handling from ATC, prohibiting autopilot use, and ensuring wing icing inspection lights are operative. Revise AFM Normal Procedures Section with weather conditions conducive to severe icing and exit procedures, including avoiding flap extension in icing conditions.
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Compliance Time
Within 30 days after the effective date of this AD
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Affected Aircraft
Cessna Model 500, 501, 550, 551, and 560 series airplanes equipped with pneumatic deicing boots, 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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