Fuel

Question 1

Where does fuel supply

Answer 1

Always the wings, so it feeds to wings always

Question 2

Does it have dc pumps

Answer 2

Yes to assist ac pump plus feed apu, primary job is to feed ac pumps

Question 3

Ones aux pump start automatically

Answer 3

Yes when primary pump is switched off

Question 4

Is crossfeed sov automatic

Answer 4

Yes

Question 5

What is recirc

Answer 5

Recirc fuel to warm fuel

Question 6

On fuel page what is green figure

Answer 6

What has been used and

Question 7

Are feed and transfer same pipes

Answer 7

Yes, changed by valve selection

Question 8

What fuel levels

Answer 8

Hi-hi,low-low

Question 9

How is fuel vent stopped

Answer 9

Dc pump in vent system

Question 10

What is hi-hi

Answer 10

Manual refuelling

Question 11

Where is surge box

Answer 11

By door l/h and r/h side

Question 12

How are fuel tank vents arranged

Answer 12

All fuel tanks are vented through an open system of large diameter vent lines within the tanks and fuselage. These lines connect all tanks to two surge boxes within the left and right fuselage sidewalls. Each surge box is connected to a vent outlet port on its respective left or right wing lower surface.

Question 13

What are dive and vent lines

Answer 13

Each wing tank is connected to the surge box by a main vent line (also called the “dive” vent). It extends from the wing compartment outboard of WS287 to the surge box. It is also connected by an inboard vent line (also called the “climb” vent) which connects the forward portion of the wing tank to the bottom of the surge box. Location of the “climb” and “dive” vent inlets within the wing is such that at least one vent inlet will not be submerged at any aircraft attitude. This ensures unrestricted venting of the wing tank.

Question 14

What are witness drains

Answer 14

All fuel pressure feed lines inside the fuselage and inside the aft equipment bay are of double walled (shrouded) construction. In the event of a fuel pressure feed line leak, the leaking fuel will be collected by the shroud assembly and drained overboard. The fuel witness drains are located on the fuselage belly fairing between both MLG bay doors and at the aft drain mast assembly located forward of the aft equipment bay door access panel. No leaks are permitted.

Fuel pump electrical conduits that pass through the wing and center fuel tanks are monitored for fuel leakage into the conduit by witness drains. Fuel leaking into an electrical conduit will be indicated by fuel leaking from the witness drain. The witness drains are located on the fuselage belly fairing between both MLG bay doors. No leaks are permitted.

Question 15

Where does refuel switch get power from

Answer 15

Apu battery with no external power selected

Question 16

What is fuel press

Answer 16

50psi max

Question 17

What is sov test

Answer 17

Sends signal to hi-hi and refuel valves and importantly FIDEEX
To check pot fuel isolation valves

Question 18

Hi-low what does it mean

Answer 18

Fuel tank is empty via sensor

Question 19

What percentage is hi-low

Answer 19

97 percent

Question 20

What happens when refuel start switch is pressed more than 5 secs

Answer 20

The gauge gives the fuel that will be loaded

Question 21

What is lateral imbalance

Answer 21

1100lbs

Question 22

What is fuel recirculation

Answer 22

Stops fuel freezing, to turn on above 34000ft,

The fuel recirculation system has been installed to permit the Global to conduct long-range, highaltitude flights in cold ambient conditions. The aircraft wing tank fuel must be heated to prevent bulk fuel temperatures from approaching/reaching the freezing point of the fuel. This situation is most likely to occur when the aircraft flies within or across the tropics at high altitude. The engines generate the heat. The hot engine oil is cooled in the FCOC (fuel cooled oil cooler), where the oil heat is rejected into the feed fuel. The FRTT (fuel return to tank) valve allows the hot fuel, downstream of the HP pump, to return to the fuel tank via the A/C fuel recirc system. With the FRTT valve closed, engine internal fuel recirculation is allowed for heat management purposes, as per the already certified baseline A/C configuration.

Once the wing fuel temperature is warm enough (>10°C), a WING FUEL HI TEMP caution message will appear reminding them to turn the system OFF.

Question 23

What is fuel scavenge

Answer 23

The purpose of the fuel scavenge system is to reduce the amount of unusable fuel in the wing and center tanks. The fuel ejectors are used to recover an additional (approximately) 130 pounds of previously unusable fuel from these tanks. The fuel scavenge system incorporates two subsystems: 1. Wing tank scavenge system 2. Center tank scavenge system

Question 24

What is wing tank scavenge

Answer 24

Wing Tank Scavenge System The wing tank scavenge system ejectors receive motive flow when the DC AUX PUMPs are in operation (examples: failed AC PRIMARY PUMP, takeoff/landing configuration, low fuel mode). Fuel is scavenged from the left and right wing feed tanks and dumped into their DC AUX PUMP collector boxes. The action of the ejectors keeps the collector boxes full, which maintains the DC AUX PUMPs primed until the fuel is consumed from the wing feed tanks. The DC AUX PUMP collector boxes are an open box sealed at the bottom. They incorporate a flapper check valve to ensure DC AUX PUMP gravity feed in the event a wing tank scavenge ejector fails. The wing tank water drains are located in the DC AUX PUMP collector boxes.

Question 25

How many places will give fuel quantity

Answer 25

4

Question 26

How many temp sensors

Answer 26

5, 3 in right 2 in left