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Civil aviation authorities in Brazil are warning of an “unsafe condition” on all Embraer EMB 545 Legacy 450 and EMB 550 Legacy 500 business jets.
The FAA issued an emergency airworthiness directive Monday, flagging and restating the warning from Brazil’s Agência Nacional de Aviação Civil (ANAC) and issuing instructions to all operators of the aircraft types in the U.S.
According to the FAA, the alert is based on reports of in-service pitch trim actuator failures on one load path.
“This failure increases the risk of failure on both load paths of the pitch trim actuator, and may leave the airplane horizontal stabilizer free to move according to aerodynamic loads, which may result in loss of control of the airplane,” the agency said.
The FAA and ANAC warnings lay out procedures for an operational check of the pitch trim actuator of the horizontal stabilizer, an option to do a pitch trim verification, and applicable on-condition actions. These include replacing the pitch trim actuator if the operational check fails or if the pitch trim verification fails, and performing an operational check on the replaced pitch trim actuator.
The FAA said the AD is an interim action. The agency will wait on required reporting from operators to develop a “final action” for the problem.
