AD 2008-19-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Harco Labs, Inc. Pitot/AOA Probes (Part Numbers 100435-39, 100435-39-001, 100435-40, and 100435-40-001) |
Unsafe Condition
Blockage within the pitot/AOA system from freezing condensation, resulting from improperly performing pitot/AOA probe heaters, could lead to incorrect indication of impact air pressure (airspeed/AOA). This could result in the stall warning becoming unreliable and the stick pusher, overspeed warning, autopilot, and yaw damper malfunctioning.
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Required Actions
Incorporate information into the Limitations section of the airplane flight manual (AFM) to allow operation only under day visual flight rules (VFR) and allow only a VFR flight plan. Test the pitot/AOA probes for heater performance and replace the pitot/AOA probe if it fails the heater performance test.
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Compliance Time
Before further flight
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Affected Aircraft
Harco Labs, Inc. pitot/angle of attack (AOA) probes, part numbers 100435-39, 100435-39-001, 100435-40, and 100435-40-001, serial numbers 740000 through 799999, installed on, but not limited to, Eclipse Aviation Company Model EA500 airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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