AD 2021-12-14 Continues To Require Revising The Existing AFM Procedures
The FAA is superseding Airworthiness Directive (AD) 2020-08-11, which applied to all Yaborã Industria Aeronáutica Model ERJ 190-300 and ERJ 190-400 airplanes.
AD 2020-08-11 required revising the existing airplane flight manual (AFM) procedures associated with messages of smoke in the electronic bays presented on the respective engine indication and crew alerting system (EICAS). This AD continues to require revising the existing AFM procedures, and adds requirements for a terminating modification of the electrical wiring of the mid-electronic bay and backup smoke detectors; as specified in an Agência Nacional de Aviação Civil (ANAC) AD, which is incorporated by reference. This AD was prompted by a failure propagation test, which revealed that under certain conditions, the smoke detection system of the electrical bays erroneously indicated the presence of smoke via the respective EICAS messages. The FAA is issuing this AD to address the unsafe condition on these products. This AD becomes effective July 26, 2021.
Supplementary Information: The FAA issued AD 2020-08-11, Amendment 39-19903 (85 FR 27112, May 7, 2020) (AD 2020-08-11), which applied to all Yaborã Industria Aeronáutica Model ERJ 190-300 and ERJ 190-400 airplanes. AD 2020-08-11 required revising the existing AFM procedures associated with messages of smoke in the electronic bays presented on the respective EICAS. The FAA issued AD 2020-08-11 to provide the flightcrew with revised AFM procedures for responding to erroneous indications of smoke in the electrical bays presented on the EICAS. The AFM procedures are intended to prevent loss of all electrical digital current (DC) essential buses, causing loss of electrical power for critical systems of the airplane.
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