Final answer:
In the operation of an aircraft gas turbine engine fuel control unit, the weight of the aircraft is not a factor considered. The unit uses parameters like air density, throttle position, engine temperature, and compressor speed, while the aircraft weight affects overall flight performance and fuel efficiency but not the unit's real-time operation.
Step-by-step explanation:
The operation of an aircraft gas turbine engine fuel control unit is governed by various factors that ensure the proper mixture of fuel and air is delivered to the engine under all operating conditions. However, there are certain factors that are not used in this operation. The weight of the aircraft, for example, is not a factor used by the fuel control unit. This unit primarily considers parameters such as air density, throttle position, engine temperature, and compressor speed to regulate the fuel flow.
Other factors such as altitude, air temperature, and engine power demand are critical inputs for the fuel control unit. In contrast, the weight of the aircraft influences flight performance and fuel consumption on a broader scale but does not directly affect the real-time operation of the fuel control unit for the engine.