AD 99-21-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Embraer S.A. | EMB-145 | Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-145 Series Airplanes |
| aircraft | Embraer S.A. | EMB-145ER | Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-145 Series Airplanes |
| aircraft | Embraer S.A. | EMB-145LR | Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-145 Series Airplanes |
| aircraft | Embraer S.A. | EMB-145MR | Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-145 Series Airplanes |
Unsafe Condition
Vertical speed, airspeed, and altitude fluctuations, and/or erratic indications during descent and approach to land in the rain, caused by a flaw in the design of the anemometric static ports. These conditions could result in reduced controllability of the airplane during the descent and approach to land in the rain.
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Required Actions
Revise the Airplane Flight Manual (AFM) to prohibit autopilot and flight director use during approach in rain, modify the central hole of the anemometric static ports, and optionally replace the current connection adapter with a nipple adapter. Compliance with Service Bulletin No. 145-34-0026, Change No. 01 is required.
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Compliance Time
Before further flight
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Affected Aircraft
EMBRAER Model EMB-145 series airplanes with serial numbers 145004 through 145144 inclusive, 145146 through 145149 inclusive, and 145152.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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