AD 99-24-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Embraer S.A. | EMB-135ER | Airworthiness Directives; EMPRESA BRASILEIRA DE AERONAUTICA S.A. (EMBRAER) Model EMB-135 And EMB-145 Series Airplanes |
| aircraft | Embraer S.A. | EMB-135LR | Airworthiness Directives; EMPRESA BRASILEIRA DE AERONAUTICA S.A. (EMBRAER) Model EMB-135 And EMB-145 Series Airplanes |
| aircraft | Embraer S.A. | EMB-145 | Airworthiness Directives; EMPRESA BRASILEIRA DE AERONAUTICA S.A. (EMBRAER) Model EMB-135 And EMB-145 Series Airplanes |
| aircraft | Embraer S.A. | EMB-145ER | Airworthiness Directives; EMPRESA BRASILEIRA DE AERONAUTICA S.A. (EMBRAER) Model EMB-135 And EMB-145 Series Airplanes |
| aircraft | Embraer S.A. | EMB-145LR | Airworthiness Directives; EMPRESA BRASILEIRA DE AERONAUTICA S.A. (EMBRAER) Model EMB-135 And EMB-145 Series Airplanes |
| aircraft | Embraer S.A. | EMB-145MR | Airworthiness Directives; EMPRESA BRASILEIRA DE AERONAUTICA S.A. (EMBRAER) Model EMB-135 And EMB-145 Series Airplanes |
Unsafe Condition
Failure of the autopilot to automatically disconnect from flight director #2 at a low altitude during windshear conditions due to a software discrepancy in the autoflight IC-600 integrated avionics computer.
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Required Actions
Revise the AFM Limitations section to prohibit flight director #2 coupled to autopilot below 1,500 ft AGL; install a warning placard on the cockpit glareshield per Embraer Service Bulletin 145-31-0017. Compliance required within 20 flight hours after effective date.
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Compliance Time
Within 20 flight hours after the effective date
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Affected Aircraft
All EMBRAER Model EMB-135 and EMB-145 series airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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