System to determine a state of a valve

A system to determine a state of a valve, the system comprising a controller comprising a processor, the processor being configured to function as a determining module to make a comparison between values and:

• a) determine a first pressure of a fluid flow at a first location within a gas turbine engine;
• b) determine a second pressure of a compressed fluid at a second location within the gas turbine engine when the valve is in the first position;
• c) compare the first pressure and the second pressure to determine the state of the valve;
• d) command the valve to move from the first position towards a second position;
• e) determine the second pressure of the compressed fluid at the second location;
• f) compare the pressure at the second location when the valve is in the first position to the pressure at the second location when the valve has been commanded to move towards the second position;
• and,
• g) determine whether the valve has moved from the first position towards the second position when commanded to do so.

A method to determine a state of a valve, the method comprising steps to:

• a) determine a first pressure of a fluid flow at a first location within a gas turbine engine;
• b) determine a second pressure of a compressed fluid at a second location within the gas turbine engine when the valve is in the first position;
• c) compare the first pressure and the second pressure to determine the state of the valve;
• d) command the valve to move from the first position towards a second position;
• e) determine the second pressure of the compressed fluid at the second location;
• f) compare the pressure at the second location when the valve is in the first position to the pressure at the second location when the valve has been commanded to move towards the second position;
• and,
• g) determine whether the valve has moved from the first position towards the second position when commanded to do so.