Regarding an inner loop Automatic Flight Control System (AFCS), which statement accurately describes the system's configuration?
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A
It is equipped with one or more high-speed actuators that adjust the control inputs directed to the swash plate without affecting the pilot's cyclic controls.
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B
It is responsible for controlling the aircraft exclusively about the longitudinal axis (roll).
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C
It focuses on controlling the aircraft solely about the lateral axis (pitch).
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D
It incorporates one or more high-speed actuators that adjust both the inputs to the swash plate and the pilot's cyclic controls.
Refer to figures.
Actuators move the flying controls in response to signals from a computer. They may be:
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in series or
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in parallel with the normal control runs.
A series actuator:
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Is a fast acting (HIGH SPEED) linear mechanical device in series with the control run.
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Converts an electrical signal into a displacement of its output shaft relative to its body. A neutral position is achieved when the free end of the output shaft is at mid-travel.
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Moves the aerofoil surfaces.
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Has limited authority (10%-20%).
More specifically, in a series actuator system, an attitude sensor feeds a signal to the computer, which sends a demand to the actuator. The actuator, mechanically through the motor or hydraulically, moves the control rods to the pitch change mechanism, such as the swash plate and, by extension, the surfaces, but NOT to the the pilot's cyclic controls.
Αn inner loop automatic flight control system (AFCS) is designed to handle rapid and precise adjustments to control inputs. Thus, the system incorporates the aforementioned actuators to make these adjustments without affecting the pilot's cyclic controls.
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