AD 85-25-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | 552 | Airworthiness Directives; Cessna Models S550 and 552 Airplanes |
| aircraft | Cessna Aircraft Company | S550 | Airworthiness Directives; Cessna Models S550 and 552 Airplanes |
Unsafe Condition
Hazardous accumulation of ice on the wing leading edge and horizontal stabilizer during flight in icing conditions.
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Required Actions
Install a placard on the instrument panel stating 'FLIGHT INTO KNOWN OR FORECAST ICING PROHIBITED', revise the Airplane Flight Manual to include the prohibition, inspect and modify the fluid ice protection system for inboard and outboard wings and horizontal stabilizer per specified service letters, and report defects within 5 days. Alternate compliance may be approved.
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Compliance Time
A. Prior to further flight; B. Within the next 15 flight hours or 15 days after the effective date; C. Within the next 25 flight hours or 30 days after the effective date; D. Within 5 days after the required inspection.
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Affected Aircraft
Cessna Models S550 (unit numbers 0001-0048, 0051-0075, 0077, 0079) and 552 (-0001 to -0015).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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