Systems - Fuel

Question 1

When does LOW fuel annunciator illuminate?

Answer 1

When fuel quantity is less than 2000 lbs in either main tank

Will dissapear once fuel is above 2500 lbs

Question 2

When does fuel CONFIG annunciator illuminate?

Answer 2

When center tank quantity is greater than 1600 lbs, both center tank pumps are producing low or no pressure and either engine is running

Question 3

When does fuel IMBAL annunciator illuminate?

Answer 3

When main tank fuel quantity differs by more than 1000 lbs

Remains on until fuel is back to within 200 lbs

Question 4

Maximum and Minimum Fuel Temp

Answer 4

Max 49°C

Min 3°C above specified min temperature for fuel being used, or -43°C whichever is higher

No warning for either limitation

Question 5

How many fuel pumps in total?

Answer 5

6 total

2 in each tank, aft and forward main tank, L and R center tank

Question 6

Will engines continue to operate without fuel pumps?

Answer 6

Engines will work on suction fees alone, with reduced thrust ratings at higher altitudes approx 30,000 and above.

1 pump can supply adequate fuel pressure to both engines if cross feed valve is open

Question 7

Insufficient Fuel alert on FMC indicates what?

Answer 7

Predicted fuel at destination is less than 2000 lbs

Question 8

Approx Fuel Tank Capacity

Answer 8

Mains - 8.6k ea
Center - 28k

Total - 46k