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Flashcards in 12. Fuel Deck (12):

Recall FUEL SD symbology and color-coding

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Fuel Temperature

White – Fuel temp in degrees C

Fuel Qty Channel Indicator

Indicates active fuel quantity channel

Fuel Pumps

White - Pump commanded off

Green - Pump is on and operating normally

Amber - Pump is commanded on but has low pressure - "P" appears

Fuel System Test

This is a maintenance function only

Total Fuel Weight

White - Total usable fuel in pounds

 Fuel Crossfeed Valve

White – Crossfeed valve closed (off)

Green - Crossfeed valve open (on)

Ballast Fuel

Blank - Ballast fuel entered in MCDU is 0

Cyan - MCDU entered value > 0

Amber - FMS ballast fuel has changed after takeoff

 Fuel Quantity

White - Total fuel quantity per tank

Start Pump

Blank - Pump is off

Green - Pump commanded on

Fuel Used

White - Fuel used per engine

**Note: Do not enter BALLAST FUEL (or unusable fuel) into MCDU – Delta incorporates this data into its AWABS loading and performance calculations


Recall the function of the FUEL QTY A/B button

Selects the alternate channel of the fuel quantity gauging system


Recall the function of the FUEL SYS TEST button

**Note: Button is a MAINTENANCE function only – no crew action required. When pushed and held, starts a fuel system test display on the FUEL SD


Recall the function of the START PUMP

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A DC start pump, located in the right main tank, provides fuel pressure for starting the APU or engines when AC power is not available


Recall the function of the FUEL USED RESET button

Resets fuel used digits on the fuel synoptic


Recall approximate fuel tank capacities

Right Wing Tank

9,300 lbs

Center Wing Tank

6,000 lbs

Left Wing Tank

9,300 lbs


24,600 lbs


Recall the number of fuel pumps available for each tank

Each main tank uses two AC boost pumps arranged in parallel

 The center tank has two identical pumps arranged in series

 Normally, fuel from the left tank feeds the left engine and fuel from the right tank feeds the right engine, however, if center tank fuel is present, the higher pressure produced by the center pumps will allow the center tank to feed both engines


Recall the Fuel Return to Tank (RTT) process

Excess warmed fuel cycling through the engine fuel system is returned to the inboard, cooled corner of each main tank

 This process warms the fuel in the tank & retards wing ice formation due to cooled fuel

 Fuel return to tank flow may be inhibited by the EEC for many reasons, including: takeoff, landing, main tank fuel low or high fuel temperature


Describe the use of FUEL X-FEED lever

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A FUEL X-FEED lever on the pedestal permits routing of fuel from either main fuel tank to one or both operating engines. Cross-feeding is enabled when the valve is opened and the boost pumps on the receiving side are turned off


Recall features of the Fuel Venting system

The ventilation system is designed to make sure the air pressure inside each tank is approximately the same as the ambient air pressure outside the tank

 Right and Left main tanks are vented to the center tank

 Center tank fuel is vented to the wingtip vent boxes


Recall how the APU is supplied fuel

The APU normally is supplied fuel from the right main tank, however, if the center tank contains fuel and its pumps are on, the center tank will supply the APU


Recall APU fuel usage for ground operations

350 lbs/hour