Chapter 12 - Fuel Flashcards
What is max fuel capacity on the 747-400?
359,414 lbs
(359,400)
How many fuel tanks on the 747-400?
- 7 total
- 4 Main tanks 1,2,3,4
- 2 Reserve tanks 2,3
- 1 Center tank
- The horizontal tank is decommissioned.
Where is fuel tank temperature taken?
Main Tank 1
What tank does the APU take fuel from when operating?
Main tank 2
EICAS fuel imbalances (quantity) messages for:
- Main tanks 1 & 4?
- Main tanks 2 & 3?
- Fuel Imbalance?
3000 LBS between tanks 1 and 4
6000 LBS between tanks 2 and 3
6000 LBS between INBOARD and OUTBOARD tanks
How many fuel pumps do the Main outboard tanks have?
2 Main pumps
How many fuel pumps do the Main inboard tanks have?
Main 2
5
- 2 main pumps
- 2 OVRD/JETTISON pumps
- 1 APU DC pump
Main 3
4
- 2 main pumps
- 2 OVRD/JETTISON pumps
Which pumps have the most pressure?
CWT OVRD/JETTISON pumps
What does FUEL TANK/ENG indicate and what is the crew action?
Displays when inboard main tank is equal to or less than the outboard main tank
The crew action is to…
- Push off the 2 & 3 OVRD pumps
- Close X-FEED valves 1 & 4
On aircraft with an electric scavenge pump, when is the pump commanded to operate? Where does the scavenged fuel go? How long will it operate?
• Scavenge commences at reserve tank 2 and 3 transfer initiation.
• Fuel is discharged into number 2 main tank
• The pump operates for 120 minutes or until low pressure is sensed.
When will the fuel system automatically balance itself?
Automatic balancing of the fuel system is accomplished during fuel jettison ONLY, by the fuel jettison control system.
What is the difference between total fuel and calculated fuel? When are the values different
• Total fuel is the fuel sensed in the tanks.
• Calculated fuel separates from total fuel when the first engine is started. It uses engine fuel flow subtracted from the fuel sensed at engine start.
On taxi out, the EICAS advisory message “FUEL IMBAL 1-4” is displayed. What does this mean?
Can you depart?
You configure the crossfeed manifold and fuel pumps to bring the fuel imbalance to 2,800 pounds. Is the message still displayed?
Can you depart?
• The EICAS advisory indicates a fuel difference between main tanks 1 and 4 of 3,000 pounds or more.
• No.
• The message will still be displayed, because it will not disappear until the difference is less than 1,000 pounds.
• Yes, the limitation is 3,000 pounds.
You are overweight for landing and must land. Fuel jettison is required. Per the QRH procedure, you arm jettison system by selecting jettison controller A.
How do you know the system is armed for fuel jettison?
After entering your desired fuel remaining, ATC asks you how long you will be jettisoning fuel.
How can you provide the information?
• Arming of the fuel jettison system is indicated by an outline of the jettison manifold being displayed on the secondary EICAS Fuel Synoptic Page.
• The jettison time will be displayed on the upper right corner of the Fuel Synoptic Page 90 seconds after jettison is commenced.
You are jettisoning fuel using jettison controller A. Jettison controller A fails.
What happens?
• Jettison will terminate and the EICAS message ”>FUEL JETT A” will display
• Jettison controller B must be selected manually
What is the purpose of the 1 and 4 transfer valves?
• They are used during fuel jettison
• They are used in a non-normal procedure if both boost pumps fail in either the number 1 or 4 main tank.
You are fully configured for takeoff. What are the positions of the number 2 and 3 crossfeed valves?
What are the cockpit indications?
• The crossfeed valves are closed.
• The flow bars in the crossfeed switches are visible.
What does the careted EICAS message “>FUEL OVD CTR L” mean?
• On the ground, more than 17,000 pounds of fuel is in the center wing tank and the left override/jettison pump is OFF
• In cruise, more than 4,000 pounds of fuel is in the center wing tank and the left override/jettison pump is OFF
You are starting the APU. External power is not available. How and from where is fuel supplied to the APU?
A DC operated fuel pump is powered by the Main Battery Bus and supplies fuel from the number 2 main tank.
In-flight, Where is the fuel temperature as indicated on the EICAS taken from?
Main tank 1
What is the minimum fuel temperature and what should be done if the fuel temperature decreases below the minimum?
- 3 degrees C above the fuel freeze point
- Increase speed or change altitude or deviate to a warm air mass or all three to achieve a TAT above the fuel temperature limit
What resource would you use to identify the Fuel Freeze point for the type of fuel being used?
QRH
. If the fuel temperature system fails, what will you use as a source for fuel temperature?
The total air temperature indication.
Where are #2 and #3 RSV tanks located?
o Outboard of 1 and 4 mains
o Gravity feeds into main 2 and 3
Can Jettison valves be opened on the ground?
Yes and it will spill overboard if the aircraft is being fueled.
When getting ready to jettison fuel, after FUEL JETTISON switch is in A or B, what happens?
- FUEL TEMP on Primary EICAS turns magenta states FUEL TO REMAIN
- TIME REMAINING is displayed on the FUEL SYNOPTIC, based on a predetermined rate, is updated 90 sec. after start of jettison
- After jettison is complete, FUEL TO REMAIN changes to white and flashes for 5 seconds.
Any configuration warnings during jettison?
Do not extend or retract flaps between 1 and 5 during jettison.
Max and min fuel temp?
MAX 54
MIN -40 for Jet A
FUEL TEMP turns amb at -37, cues fuel temp near freezing
- Standard Minimum Ramp Fuel (excluding ballast)?
- Conditional Minimum Ramp Fuel (exluding ballast)?
- What is required if fuel is less than Standard Minimum Ramp?
- 72,000 LBS
- 53,000 LBS
- Requires approval from the Director of Ops, Chief Pilot, or their management designee.
Minimum fuel for landing?
12,000 LBS
- What do the unguarded alternate action switches for X FEED 1 +4 do when opened?
- What do the guarded alternate action switches for X FEED 3+3 do when opened?
- opens the valves
- arms valves for automateic operation based on flap position during take-off
- What does the bar visisble indicate on X FEED switches 1 +4?
- What does the amber VALVE light indicate on X FEED switches 1+4?
- crossfeed valve opens
- crossfeed valve position does not agree with switch position
- What does the bar in X FEED switch 2 and 3 indicate?
- What does the VALVE light indicate on X FEED switch 2 +3?
- crossfeed valve opens when commanded by system logic
- crossfeed valve not in system logic commanded position
FWD and AFT Fuel Pump Pressure (PRESS) Light means?
Fuel pump output pressure low
What does the Override (OVRD) Fuel Pump Switch indicate when ON light is visible?
Fuel pump operates when commanded by system logic
Center Wing Tank Pump Switches with PRESS light illuminated? When is it inhibited?
- Illuminates to indicate output pressure is low
- light is inhibited when switch is selected off
What does the FUEL XFER MAIN 1 & 4 switch do ON? OFF?
- ON: 1 +4 XFER valves open
- OFF:
- 1 +4 XFER valves closed
- 1 +4 XFER valves opened when commanded by system logic
FUEL TO REMAIN Selector function?
- Selects fuel to remain after jettison (minimum 28,000 LBS)
- displays on EICAS
Fuel Jettison NOZZLE Valve Switch in ON position?
- Jettison nozzle valve selected open
- when jettison system armed, activates override/jettison pumps in tanks containing fuel (pump switches must be ON)
Fuel Jettison Selctor switch in OFF position? A +B position?
- OFF
- disarms dettison system
- removes EICAS fuel to remain indication
- A or B
- arms jettison system
- displays preslected fuel to remain on EICAS
Fuel Jettison Nozzle VALVE light illuminated (amber)?
Fuel Jettison nozzle valve is not in the selected position
When does the fuel temperature readout - normally diplayed white, turn amber?
at a fuel temperature of -37C
Fuel from Reserve tanks 2 and 3 is:
Gravity fed to respective main tanks
What is the position of the crossfeed valves during takeoff, with all fuel tanks full?
1 + 4 open, 2 + 3 closed
What flap action shall be avoided during fuel jettision?
Extend or retract flaps between positions 1 and 5
The load master wants you to load 5000 LBS of fuel into center wing tank to use as ZFW ballast. You notice the center wing tank fuel quantity indicator is broken. It is properly placarded with DMI and MEL numbers. Is this allowed?
No
