Removing water from fuel tanks

An aircraft fuel tank assembly comprising:

• an aircraft fuel tank configured to store a liquid hydrocarbon,
• a filter comprising a water-permeable member which is configured to enable liquid water in the aircraft fuel tank to pass through the water-permeable member, and at least substantially prevent passage of liquid hydrocarbon;
• and
• an operator-openable valve arrangement configured to move between a closed flow condition in which flow through the valve arrangement is prevented, and an open flow condition configured for liquid water to pass from the tank, through the water-permeable member and drain out of the tank, wherein the operator-openable valve arrangement is configured to be moved to the open flow condition by attachment of a tool to an outlet of the operator-openable valve arrangement, and wherein the valve arrangement is between the filter and an outflow of the aircraft fuel tank.

An aircraft fuel tank assembly comprising:

• an aircraft fuel tank configured to store a liquid hydrocarbon,
• a filter comprising a water-permeable member which is configured to enable liquid water in the aircraft fuel tank to pass through the water-permeable member, and at least substantially prevent passage of liquid hydrocarbon;
• and
• an operator-openable valve arrangement configured to move between a closed flow condition in which flow through the valve arrangement is prevented, and an open flow condition configured for liquid water to pass from the tank, through the water-permeable member and drain out of the tank, wherein the operator-openable valve arrangement is configured to be moved to the open flow condition by attachment of a tool to an outlet of the operator-openable valve arrangement, and wherein a liquid water receiving space is defined between the filter and the valve arrangement.