What is the minimum oil temperature required before advancing the FCS past idle?

What is the minimum oil temperature required before advancing the FCS past idle?

• A. 0 °C
• B. -5 °C
• C. 5 °C
• D. 10 °C

Answer: (A)

The FCS relies on hydraulic fluid to move the controls smoothly, and fluid viscosity matters a lot when starting from idle. If the hydraulic oil is too cold, it’s too viscous, making the pumps work harder and the controls feel stiff or sluggish, which can stress the system or delay response. Therefore, the minimum oil temperature to advance the FCS past idle is 0 °C. Once the oil reaches 0 °C or higher, the fluid is within an acceptable viscosity range for normal operation. Higher temperatures like 5 °C or 10 °C are fine but aren’t the minimum. A temperature of -5 °C would be below the required minimum and should not be used to advance the FCS.

The FCS relies on hydraulic fluid to move the controls smoothly, and fluid viscosity matters a lot when starting from idle. If the hydraulic oil is too cold, it’s too viscous, making the pumps work harder and the controls feel stiff or sluggish, which can stress the system or delay response. Therefore, the minimum oil temperature to advance the FCS past idle is 0 °C. Once the oil reaches 0 °C or higher, the fluid is within an acceptable viscosity range for normal operation. Higher temperatures like 5 °C or 10 °C are fine but aren’t the minimum. A temperature of -5 °C would be below the required minimum and should not be used to advance the FCS.