Fuel System

Question 1

Outboard tank capacity

Inboard?

Answer 1

1606

1671

Question 2

• Wing tank gauge quantity indication
• Tank 5?
• totalizer?

Answer 2

12 * 1000 lbs
18 * 1000 lbs
0-66,000 lbs

Question 3

Boost pump px

Answer 3

15-30psi

Question 4

Booster (transfer) element rate

Scavenge rate?

Answer 4

5,000lbs per hour

3,000lbs per hour (2500 under 0 backpx)

Question 5

Engine fuel temp range

Answer 5

40-70F

Question 6

TD Modes of operation Start Limiting

• engine rpm
• power lever
• take possibility
• put possibility
• TIT limit
• Delivered fuel

Answer 6

<94%
N/A
50%
0%
830C
50-100%

Question 7

TD Modes of operation Temp Limiting

• engine rpm
• power lever
• take possibility
• put possibility
• TIT limit
• Delivered fuel

Answer 7

>94%
<66 coord 
20%
0%
1,077C
80-100%

Question 8

TD Modes of operation Temp Controlling

• engine rpm
• power lever
• take possibility
• put possibility
• TIT limit
• Delivered fuel

Answer 8

>94%
>66 coord
20%
15% 
1,077C
80-115%

Question 9

How many valves in the Crossfeed system?

Answer 9

4

And 1 crosship

Question 10

Refuel at how many gallons per minute?

PSI?

Answer 10

600 gpm (300 each) 
55psi

Question 11

Safety feature of the transfer pump dual check valve purpose

Answer 11

Prevents reverse flow through an inop transfer pump due to a failure and during fueling ops. Designed so that only px from an operating pump will open the valve, not suction px.
(Without it, there would be an uncontrolled de fueling from the fuselage section and prevent refueling of other tanks bc of a lack of suction px to open fueling valves

Question 12

At what psi will the fuel transfer light be illuminated?

Answer 12

Below 4psi

Question 13

How many lbs per minute can fuel be dumped?

How many pounds can be shed?

Answer 13

1000lbs per min

18,000lbs

Question 14

How many probes do the outboard tanks have?
Inboard?
Tank 5?

Answer 14

• 5
• 3
• 3 (center section), 1 (bladder forward section)

Question 15

What nose up attitude will the ball check valve close?

Answer 15

6 degrees

Then the fuselage tank can’t return fuel to the center tank if the wing transfer valves are closed with the transfer pumps running (if below the standpipe)

Question 16

What happens if there isn’t at least 2000lbs of fuel in center tank 5?

Answer 16

It will not gravity flow thorough the interconnect and the forward transfer pump may cavitate

Question 17

What could happen if the 4 transfer valves are open in the wing tanks and the fuel level in those tanks is below full?

Answer 17

The valves will accept a high flow rate but the high capacity booster elements of the transfer pumps may evacuate more fuel from the fuselage tank than the scavenge pumps can replace.
Soooo…
Flow through the interconnecting pipe from the center tank to the fuselage tank makes up the different as long as there is a head of fuel in that tank

Question 18

What does the dual check valve do in the engine tanks?

Answer 18

Prevents fuel from entering the tank during Crossfeed ops when the tank bp is off

Question 19

What temp does the vernatherm element keep the fuel temp at when passing through the fuel heater/strainer?

Answer 19

40-70F

Question 20

What does the upper fuel pump assembly housing contain?

Answer 20

• engine driven bp
• secondary pump
• primary pump

Question 21

What does the lower housing contain?

Answer 21

• secondary pump discharge pressure switch
• two check valves (primary and secondary bypass)
• paralleling valve
• high px filter and it’s bypass

Question 22

How many thermocouples are there for the TD system?

Answer 22

18