12. Fuel Flashcards
Recall FUEL SD symbology and color-coding
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
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
TOTAL
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
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
