Which type of fuel pressure is used to hydraulically move the operability valve and the variable guide vanes?

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Multiple Choice

Which type of fuel pressure is used to hydraulically move the operability valve and the variable guide vanes?

Explanation:
High pressure fuel is used to hydraulically move the operability valve and the variable guide vanes. In the engine’s fuel control system, the high‑pressure fuel from the HP pump provides the hydraulic force that positions the operability valve (which controls fuel metering) and the variable guide vanes (which adjust airflow). This level of pressure is needed for quick, precise movement against springs and loads, something low or medium pressure cannot reliably provide. Jet A is just a fuel type, not a pressure level.

High pressure fuel is used to hydraulically move the operability valve and the variable guide vanes. In the engine’s fuel control system, the high‑pressure fuel from the HP pump provides the hydraulic force that positions the operability valve (which controls fuel metering) and the variable guide vanes (which adjust airflow). This level of pressure is needed for quick, precise movement against springs and loads, something low or medium pressure cannot reliably provide. Jet A is just a fuel type, not a pressure level.

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