AD 98-03-19
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Embraer - Empresa Brasileira de Aeronautica S.A. | EMB-120 | Airworthiness Directives; EMPRESA BRASILEIRA DE AERONAUTICA, S.A. (EMBRAER) Model EMB-120, EMB-120RT, and EMB-120ER Series Airplanes |
| aircraft | Embraer - Empresa Brasileira de Aeronautica S.A. | EMB-120ER | Airworthiness Directives; EMPRESA BRASILEIRA DE AERONAUTICA, S.A. (EMBRAER) Model EMB-120, EMB-120RT, and EMB-120ER Series Airplanes |
| aircraft | Embraer - Empresa Brasileira de Aeronautica S.A. | EMB-120RT | Airworthiness Directives; EMPRESA BRASILEIRA DE AERONAUTICA, S.A. (EMBRAER) Model EMB-120, EMB-120RT, and EMB-120ER Series Airplanes |
Unsafe Condition
Generator overload conditions that could result in loss of electrical power and failure of certain flight and landing control systems, and power interruption to the attitude heading reference system (AHRS) that could result in the display of erroneous heading information.
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Required Actions
Deactivate specific circuit breakers (CB 534 and CB 535) by tripping and installing collars to prevent closure, install placards prohibiting closure of the circuit breakers, revise the Airplane Flight Manual (AFM) to include operational procedures for engine failure and electrical emergencies, and perform electrical system modifications to terminate AFM revision requirements and allow circuit breaker reactivation.
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Compliance Time
Within 3 days after the effective date of this AD for airplanes not equipped with an APU (excluding specified serial numbers), and within 30 days after the effective date for all airplanes.
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Affected Aircraft
EMBRAER Model EMB-120, EMB-120RT, and EMB-120ER series airplanes up to and including serial number 120291, 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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