Fuel

Question 1

On A330-200, center to inner tank fuel transfer occurs when:

Answer 1

The center tank pumps run continuously, whenever there is fuel in the center tank. Each inner tank inlet valve controls the transfer by cycling its inner tank contents between full and approximately 2 000 kg (4 415 lb) below full. When the center tank is empty, both center tank pumps temporarily stop, and both inner tank inlet valves close.

Question 2

Outer to inner tank fuel transfer occurs when:

Answer 2

The outer tank fuel is transferred to the inner tanks by gravity. Each outer tank transfer valve controls the transfer by cycling the associated inner tanks contents between 3 500 kg (7 720 lb) and 4 000 kg (8 830 lb). When each outer tank has been empty for 5 min, its outer tank transfer valves close.

Question 3

Trim tank automatic CG control occurs when:

Answer 3

• Begins during climb to FL 255.
• Ends at descent to FL 245, or when the FMGES time to destination is less than 35 min (or less than 75 min in the case of trim tank forward transfer pump failure).