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An electromechanical actuating assembly (100), operable in a plurality of fault-tolerant modes to accommodate at least the most probable fault situations. In the M1D1-only mode, actuator-moving power is transferred only through the first drivetrain (400A) and decoupling power transmitted through the

An electromechanical actuating assembly (100), operable in a plurality of fault-tolerant modes to accommodate at least the most probable fault situations. In the M1D1-only mode, actuator-moving power is transferred only through the first drivetrain (400A) and decoupling power transmitted through the second decoupling train (600B) decouples the second drivetrain (400B) from the actuator (200). In the M2D2-only mode, actuator-moving power is transferred only through the second drivetrain (400B) and decoupling power transmitted through the first decoupling train (600A) decouples the first drivetrain (400A) from the actuator (200).

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1. An electromechanical actuating assembly, comprising: an actuator;a first motor providing actuator-moving power;a second motor providing actuator-moving power independent of the first motor;a first drivetrain for transferring actuator-moving power to the actuator;a second drivetrain for transferri

1. An electromechanical actuating assembly, comprising: an actuator;a first motor providing actuator-moving power;a second motor providing actuator-moving power independent of the first motor;a first drivetrain for transferring actuator-moving power to the actuator;a second drivetrain for transferring actuator-moving power to the actuator;a first decoupling train for transmitting decoupling power to decouple the first drivetrain from the actuator;a second decoupling train for transmitting decoupling power to decouple the second drivetrain from the actuator; andwherein the assembly is operable in a plurality of fault-tolerant modes, including:a M1D1-only mode, whereat actuator-moving power is transferred only through the first drivetrain and decoupling power transmitted through the second decoupling train decouples the second drivetrain from the actuator; anda M2D2-only mode, whereat actuator-moving power is transferred only through the second drivetrain and decoupling power transmitted through the first decoupling train decouples the first drivetrain from the actuator; andwherein the assembly further comprises a mode-conversion system for conversion to an appropriate one of the plurality of the fault-tolerant modes upon occurrence of a fault situation;wherein the mode-conversion system comprises a first motor-path converter and a second motor-path converter;wherein the first motor-path converter is convertible between a first condition whereat the first motor can be drivingly connected to the first drivetrain and a second condition whereat the first motor can be drivingly connected to the second drivetrain, andwherein the second motor-path converter is convertible between a first condition whereat the second motor can be drivingly connected to the first drivetrain and a second condition whereat the second motor can be drivingly connected to the second drivetrain. 2. An electromechanical actuating assembly as set forth in claim 1, wherein the assembly is operable in a normal-operation mode, whereat actuator-moving power is transferred to the actuator through both the first drivetrain and the second drivetrain. 3. An electromechanical actuating assembly as set forth in claim 2, wherein, when the assembly is in the normal-operation mode, the first motor provides actuator-moving power to the first drivetrain and the second motor provides actuator-moving power to the second drivetrain. 4. An electromechanical actuating assembly as set forth in claim 1, wherein the first drivetrain comprises a first ballscrew and the second drivetrain comprises a second ballscrew. 5. An electromechanical actuating assembly as set forth in claim 1, further comprising a first coupler coupling the first drivetrain and the actuator, and a second coupler coupling the second drivetrain and the actuator; wherein the first decoupling train reversibly decouples the first coupler when decoupling power is transmitted therethrough and the second decoupling train reversibly decouples the second coupler when decoupling power is transmitted therethrough. 6. An electromechanical actuating assembly as set forth in claim 5, wherein the first coupler linearly moves with the actuator when it is coupled to the first drivetrain, and wherein the second coupler linearly moves with the actuator when it is coupled to the second drivetrain. 7. An electromechanical actuating assembly as set forth in claim 6, wherein the first coupler comprises a ballnut and the second coupler comprises a ballnut. 8. An electromechanical actuating assembly as set forth in claim 1, wherein decoupling power is not provided by the first motor or the second motor. 9. An electromechanical actuating assembly, as set forth in claim 8, wherein a first decoupling motor provides decoupling power to the first decoupling train and wherein a second decoupling motor provides decoupling power to the second decoupling train. 10. An electromechanical actuating assembly as set forth in claim 1, wherein the fault-tolerant modes further comprise: a M2D1 mode whereat actuator-moving power is provided only by the second motor and is transferred only through the first drivetrain, and decoupling power transmitted through the second decoupling train decouples the second drivetrain from the actuator; anda M1D2-only mode whereat actuator-moving power is provided only by the first motor and is transferred only through the second drivetrain, and decoupling power transmitted through the first decoupling train decouples the first drivetrain from the actuator. 11. An electromechanical actuating assembly as set forth in claim 1, wherein each motor-path converter comprises a clutch. 12. An electromechanical actuating assembly as set forth in claim 1, wherein each motor-path converter comprises a solenoid switch. 13. An electromechanical actuating assembly as set forth in claim 1, wherein each motor-path converter is also convertible to a condition whereat the respective motor can be drivingly connected to neither the first drivetrain nor the second drivetrain. 14. An electromechanical actuating assembly as set forth in claim 1, wherein the first motor and/or the second motor provide the decoupling power. 15. An electromechanical actuating assembly as set forth in claim 1, wherein the mode-conversion system comprises: a first drive-decouple converter that converts between a drive condition, whereat one of the motors is drivingly connected to the first drivetrain, and a decouple condition, whereat this motor is drivingly connected to one of the first decoupling train or the second decoupling train; anda second drive-decouple converter that converts between a drive condition, whereat one of the motors is drivingly connected to the second drivetrain, and a decouple condition, whereat this motor is drivingly connected to one of the first decoupling train or the second decoupling train. 16. An electromechanical actuating assembly as set forth in claim 1, wherein the first coupler and the second coupler are positioned on same side of a centerline of the assembly. 17. An electromechanical actuating assembly as set forth in claim 13, wherein a first ballscrew and a second ballscrew are positioned on opposite sides of the centerline; and wherein the first coupler and the second coupler are protected by a ballistic shield. 18. A method of testing the electromechanical actuating assembly set forth in claim 1, said method comprising the steps of: transmitting decoupling power through the first decoupling train to decouple the first drivetrain from the actuator; andtransmitting decoupling power through the first decoupling train to decouple the second drivetrain from the actuator;wherein the transmitting steps are performed by simulating a failure occurrence so that the mode conversion system converts the assembly to the appropriate failure-tolerant mode. 19. An aircraft comprising a flight-control surface component and the electromechanical actuating assembly set forth in claim 1, wherein the flight-control-surface component is attached to the actuator and moves in response to actuator-moving power provided to the actuator by the drivetrain(s).