AD 2021-04-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Embraer S.A. | Various | Airworthiness Directives; Yaborã Indústria Aeronáutica S.A. (Type Certificate Previously Held by Embraer S.A.) Airplanes |
| aircraft | Embraer | S | Airworthiness Directives; Yaborã Indústria Aeronáutica S.A. (Type Certificate Previously Held by Embraer S.A.) Airplanes |
Unsafe Condition
The automatic takeoff thrust control system (ATTCS) provides incorrect calculations under certain conditions, which could lead to a performance reduction during takeoff, in which case the airplane may not be able to take off safely.
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Required Actions
Update the software of the installed full authority digital engine control (FADEC) systems to version B9.4 or B9.4.1, as specified in ANAC AD 2020-07-02.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
Yabor[atilde] Ind[uacute]stria Aeron[aacute]utica S.A. Model EMB-135BJ, -135ER, -135KE, -135KL, and -135LR airplanes; and Model EMB-145, -145EP, -145ER, -145LR, -145MP, -145MR, and -145XR airplanes; certificated in any category; as identified in Ag[ecirc]ncia Nacional de Avia[ccedil][atilde]o Civil (ANAC) AD 2020-07-02, effective July 21, 2020 (ANAC AD 2020-07-02).
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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