Limitations - Fuel System

Question 1

Maximum Tank Fuel Temperature

Answer 1

49ºC

Question 2

Minimum Tank Fuel Temperature

Answer 2

-43ºC or 3ºC above the fuel freezing point temperature, whichever is higher

Question 3

Running Center Tank Fuel Pump

Answer 3

Intentional dry running of a center tank fuel pump is prohibited.

Question 4

Maximum Fuel Imbalance

Answer 4

Lateral imbalance between tanks 1 and 2 must be scheduled to be zero.

Transient fuel imbalance must not exceed 453 kg.

Question 5

Fuel Loading

Answer 5

Main tanks 1 and 2 must be full if center tank contains more than 453 kg.

Question 6

Usable Tank Quantities

Answer 6

No. 1 4,819 L / 3,869 kg
No. 2 4,819 L / 3,869 kg
Center 16,179 L / 12,990 kg

TOTAL 25,817 L / 20,728 kg

Question 7

Engine Fuel Burn Rules of Thumb

Answer 7

Taxi
• Single Engine: 6 kg/min
• Two Engines: 11 kg/min

Flight (both engines)
• 36 kg/min

Question 8

APU Fuel Burn Rules of Thumb

Answer 8

Ground: 107 kg/hour (1.8 kg/min)

Flight (select examples)
• FL390 45 kg/hour
• FL200 68 kg/hour
• FL100 82 kg/hour