AD 85-24-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | S550 | Airworthiness Directives; Cessna Model S550 Airplanes |
Unsafe Condition
Hazardous accumulation of ice on the inboard wing leading edge during flight in icing conditions.
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Required Actions
Install a placard stating 'FLIGHT INTO KNOWN OR FORECAST ICING PROHIBITED' on the instrument panel, revise the Airplane Flight Manual to include the prohibition, inspect and replace as necessary the fluid ice protection system proportioning units within 15 flight hours or 15 days, and report defects within 5 days.
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Compliance Time
Prior to further flight for placard and AFM revision; within 15 flight hours or 15 days after the effective date for proportioning unit inspection and replacement.
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Affected Aircraft
Cessna Model S550 airplanes, Unit Numbers -0001 through -0075.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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