Fuel System

Question 1

Fuel System Description

Number of integral fuel tanks designated as___

Answer 1

2, No.1 and No.2

Question 2

Fuel System Description

Each wing tank is divided into___ sections: Name them

Answer 2

3, Surge bay, Main tank and Collector bay

Question 3

Fuel System Description

This Tank supplies fuel to the LEFT engine AND the APU

Answer 3

Left tank

Question 4

Fuel System Description

This tank supplies fuel to the RIGHT engine

Answer 4

Right tank

Question 5

Fuel System Description

Only this type of transfer is possible and is there engine x-feed capability

Answer 5

tank to tank, there is NO engine crossfeed capability

Question 6

Tanks - Surge Bay

Used for

Answer 6

main tank venting and fuel recovery which allows for positive pressure in the fuel tanks in flight

Question 7

Tanks - Surge Bay

What controls the pressure between the related surge bay and main tank?

Answer 7

Two outboard float vent valves and one inboard vent line control the pressure between the related surge bay and main tank

Question 8

Tanks - Surge Bay

How is each surge bay vented?

Answer 8

Each surge bay is vented through two internal standpipes connected to 2 separate NACA vents on the bottom of the wings

• 1 NACA vent is used for: “Positive Pressure”
• 1 NACA vent is used for :“Fuel Overflow”

Question 9

Tanks - Surge Bay

How is surge bay fuel used?

Answer 9

Fuel that flows into the surge bay in flight is siphoned back into the main tank as fuel is used and as pressure in the main tank decreases

Question 10

Main Tanks

Primary purpose is…

Answer 10

Primary purpose of the main tank is to store the majority of the fuel and continuously feed it to the collector bay

Question 11

Collector Bay

Provides…

Answer 11

provides a steady supply of fuel to the engine regardless of aircraft attitude

Question 12

Collector Bay

What kind of pump does each contain?

Answer 12

Each collector bay contains a “Primary Ejector Pump”

Question 13

Collector Bay

What serves as a back up source of boost fuel pressure failure?

Answer 13

Two auxiliary fuel pumps, one mounted on the floor of each collector bay, serve as a backup source of fuel boost pressure (i.e. Primary ejector pump fails

Question 14

Fuel Quantity

Answer 14

11724 lbs total (5862 lbs per tank)

Question 15

How many probes in each tank detect fuel quantity?

Answer 15

9 capacitance-type fuel probes in each tank determine the total fuel quantity

Question 16

“(1) or (2) Tank Fuel Low” caution light illuminates if fuel drops below…

Answer 16

If fuel drops below 305 lbs a “(1) or (2) Tank Fuel Low” caution light illuminates

Question 17

Fuel Temperature/Indication Readings from which fuel area and located for pilot display…

Answer 17

“Ambient Temperature” of fuel in the LEFT collector bay is shown in digital format (°C) on the MFD Fuel Page, directly below the left fuel quantity gauge

Question 18

“Engine Inlet temperature” taken from where and displayed where?

Answer 18

“Engine Inlet temperature” of left and right engine fuel (independent)—after it has passed through the Fuel/Oil Heat Exchanger—is shown in digital format just below the related fuel tank quantity at the bottom of the ED

Question 19

Describe the magnastick location, quantity when full/empty, and authorized use.

Answer 19

(1) Magnastick on the underside of each tank (outboard of the nacelle)
Magnastick readings will indicate:
- Full whenever the tank is more than 700 U.S gallons
- Empty whenever the tank is less than 100 U.S gallons
- NOTE: Not to be used by flight crew, MX ONLY

Question 20

How can fuel transfer be accomplished?

Answer 20

Fuel can be transferred on the ground or in flight provided that 115-volt variable AC power is available to operate the necessary auxiliary fuel pump (donor pump)

Question 21

What kind of fuel transfer can be accomplished?

Answer 21

Only tank to tank transfer is possible and there is NO engine crossfeed capability

Question 22

What is the only way engine fuel shutoff valves can be close?

Answer 22

Only the respective “PULL FUEL/HYD OFF” T-handles in the cockpit will close the respective fuel shutoff valves

Question 23

Where is refueling and defueling accomplished and how is it powered?

Answer 23

Located in the rear underside of the #2 nacelle

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Question 24

What is unique about the “FUELING ON” Caution light?

Answer 24

“FUELING ON” Caution light (CWP) is the ONLY caution light that is not accompanied by the illumination of the “MASTER CAUTION” light (glareshield panel)