DB's SY 737 Fuel

Question 0

Where does the fuel temp get it’s indications from?

Answer 0

No. 1 Tank

Question 1

ENG and SPAR VALVE CLOSED light

1. Off
2. Bright
3. Dim

Answer 1

1. Related fuel SOV open
2. Related fuel SOV is in transit or disagree
3. Related fuel SOV closed

Question 2

Crossfeed VALVE OPEN light

1. Off
2. Bright
3. Dim

Answer 2

1. Valve is closed
2. Valve in transit or disagree
3. Valve is open

Question 3

FILTER BYPASS light - on

Answer 3

Impending fuel filter bypass

Question 4

Center fuel LOW PRESSURE light

1. On
2. Off

Answer 4

1. Fuel pump output pressure is low AND fuel pump switch is ON.
2. Fuel pump output pressure is normal OR fuel pump switch is OFF.

Question 5

Main fuel LOW PRESSURE light

1. On
2. Off

Answer 5

1. Fuel pump output pressure is low OR fuel pump switch is OFF.
2. Fuel pump output pressure is normal.

Question 6

When is Fuel LOW alert displayed?

Answer 6

Main tank less than 2000 and remains until quantity is raised to 2500.

Question 7

When is Fuel CONFIG alert displayed?

Answer 7

1. Center tank more than 1600 and
2. Either engine running
3. Both center pumps off (or not producing sufficient pressure)

Question 8

When is Fuel IMBAL alert displayed?

Answer 8

Main tanks differ by more than 1000 and remains on until within 200.

Question 9

When is Fuel IMBAL alert inhibited?

Answer 9

1. On the ground

2. Either tank has fuel LOW indication

Question 10

How and where does the APU fed from:

1. With an AC pump on
2. With no AC pumps on
3. 808SY, 809SY, 820SY, 821SY?

Answer 10

1. AC pumps supply pressure from the left side of the fuel manifold
2. Fuel is suction fed from main tank No. 1
3. They have a DC APU fuel boost pump which operates automatically.

Question 11

How many fuel measuring sticks are on

1. Each main tank
2. The center tank

Answer 11

1. 6

2. 4

Question 12

If none of the fuel pumps are operating, will the engines still run?

Answer 12

Yes. Each engine can draw fuel from its corresponding main tank through a suction feed line that bypasses the pumps.

Question 13

How much fuel does each surge (outboard) tank hold and where does that fuel normally go?

Answer 13

235 lbs normally drain back into the main fuel tanks, as able.

Question 14

Where does fuel go when the surge (outboard) fuel tanks overfill?

Answer 14

It is drained out the vent scoop on the bottom of the wing, near the wingtip.

Question 15

What are the two ways to close both the spar and engine fuel SOVs?

Answer 15

1. Pull the engine fire handle

2. Engine start lever to CUTOFF

Question 16

Can the center tank fuel scavenge jet pump be operated manually and when will it operate automatically?

Answer 16

You cannot operate manually but it will operate automatically when the No. 1 FWD fuel pump switch is ON and the No. 1 fuel main tank quantity is about half.

Question 17

Where does the FUEL TEMP indicator get its temperature from and why?

Answer 17

The No. 1. Because the hydraulic system B (which is bigger than system A) cools the hydraulics on tank No. 2, so No. 1 tank is less affected by hydraulic cooling.

Question 18

Is the fuel heated? If so, by what?

Answer 18

Yes, by

1. Heat exchangers in each main fuel tank for the respective A and B hydraulic systems
2. The main engine oil cooler
3. The IDG fuel-cooled oil cooler

Question 19

What is the minimum fuel quantity in the related main fuel tanks for ground operation of electric motor-driven hydraulic pumps?

Answer 19

1675 lbs