AD 98-01-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | 172R | Airworthiness Directives; Cessna Aircraft Company Models 172R and 182S Airplanes |
| aircraft | Cessna Aircraft Company | 182S | Airworthiness Directives; Cessna Aircraft Company Models 172R and 182S Airplanes |
Unsafe Condition
Improper installation of the identification placard on the alternate static air source valve covers the external orifice, restricting static air reference and causing erroneous indications from altimeter, airspeed, and vertical speed indicators, which could lead to pilot reaction to incorrect flight information and possible loss of control.
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Required Actions
Fabricate and install placards prohibiting operation in IFR conditions and use of the alternate static air source; inspect the alternate static air source valve to ensure the port is not restricted by the identification placard and the valve body does not separate from the valve flange; rework or replace the valve assembly as necessary.
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Compliance Time
Immediately
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Affected Aircraft
Cessna Aircraft Company Models 172R (serial numbers 17280003 through 17280301 with specific exclusions) and 182S (serial numbers 18280001, 18280002, 18280004 through 18280060 with specific exclusions).
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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