Fuel

Question 1

Smallest outer tank fuel imbalance

Answer 1

3261 lbs

Question 2

Min and max fuel temp

Answer 2

MAX: +55°C
MIN (inner tank): -44°C to -54°C

Question 3

Min Fuel Quantity for take off

Answer 3

11,461 lbs

Question 4

Each tank capacity

Answer 4

Outer: 6,500 lbs + 6,500 lbs
Inner: 72,000 lbs + 72,000 lbs
Center: 72,000 lbs
Trim: 11,000 lbs
Total: 240,000 lbs

Question 5

Tank Filling Order

Answer 5

Inners and outers first: around 80,500 lbs fuel beings to move into trim, and around 166,500 lbs fuel should start going into Center

Question 6

Fuel Engine Feed Sequence

Answer 6

Engines draw from the INNER collector tank. As the fuel burns off fuel moves:
1. Center to Inner
2. Trim to Inner
3. Outer to Inner

Question 7

When do the FCMC (Fuel Control and Monitoring Computers) transfer fuel to/from the Trim Tank?

Answer 7

CLIMB: Passing FL255 the FCMCs initiate an AFT Transfer of Fuel.
CRUISE: During cruise fuel is transferred forward to maintain tank levels and optimum CG.
DESCENT: Forward transfer begins at FL 245 or 35 min to destination.