ATLAS 747 Fuel System Exam
Questions & Answers (Grade A+)
How many fuel tanks do we have and what are their approximate
capacities? -
correct answer ✅7 Fuel Tanks
Center Wing Tank = 52.2 kgs
Main 2 and 3 = 38.1 kgs
Main 1 and 4 =13.3 kgs
Reserve 2 & 3 = 4.0 kgs
Total Capacity = 163.0 kgs
What commands fuel valves to open or close and fuel pumps to
turn on and off according to fuel management logic? -
correct answer ✅Fuel System Management Cards (FSMCs)
Which crossfeed valves are affected by flap extension on the
ground? -
correct answer ✅2 and 3. They are closed by the FSMCs when
flaps extend to takeoff position on the ground.
, ATLAS 747 Fuel System Exam
Questions & Answers (Grade A+)
Which fuel pumps are system logic pumps, in other words,
commanded to turn on and off by system logic during normal
operations? -
correct answer ✅Override/jettison pumps 2 and 3. They are
inhibited from operating when pressure is detected from both CWT
override/jettison pumps.
Trace the flow of fuel to the engines when there are 7700 kgs or
more fuel in the Center Wing Tank., from blockout. -
correct answer ✅• Both CWT pump switches should be ON.
• X-‐feed valves 2 and 3 close when flaps extended for takeoff
• CWT pumps feed engines 1 and 4.
• Main pumps 2 and 3 feed their related engine.
Trace the flow of fuel to the engines when there is less than 7700
kgs of fuel in the center wing tank, from blockout. -
correct answer ✅• Both CWT tank pumps should be off. •X-‐feed
valves 2 and 3 close when flaps extended for takeoff.
• Override/jettison pumps 2 feed engine 1
• Override/jettison pumps 3 feed engine 4.
• Main pumps 2 and 3 feed their related engine.
Questions & Answers (Grade A+)
How many fuel tanks do we have and what are their approximate
capacities? -
correct answer ✅7 Fuel Tanks
Center Wing Tank = 52.2 kgs
Main 2 and 3 = 38.1 kgs
Main 1 and 4 =13.3 kgs
Reserve 2 & 3 = 4.0 kgs
Total Capacity = 163.0 kgs
What commands fuel valves to open or close and fuel pumps to
turn on and off according to fuel management logic? -
correct answer ✅Fuel System Management Cards (FSMCs)
Which crossfeed valves are affected by flap extension on the
ground? -
correct answer ✅2 and 3. They are closed by the FSMCs when
flaps extend to takeoff position on the ground.
, ATLAS 747 Fuel System Exam
Questions & Answers (Grade A+)
Which fuel pumps are system logic pumps, in other words,
commanded to turn on and off by system logic during normal
operations? -
correct answer ✅Override/jettison pumps 2 and 3. They are
inhibited from operating when pressure is detected from both CWT
override/jettison pumps.
Trace the flow of fuel to the engines when there are 7700 kgs or
more fuel in the Center Wing Tank., from blockout. -
correct answer ✅• Both CWT pump switches should be ON.
• X-‐feed valves 2 and 3 close when flaps extended for takeoff
• CWT pumps feed engines 1 and 4.
• Main pumps 2 and 3 feed their related engine.
Trace the flow of fuel to the engines when there is less than 7700
kgs of fuel in the center wing tank, from blockout. -
correct answer ✅• Both CWT tank pumps should be off. •X-‐feed
valves 2 and 3 close when flaps extended for takeoff.
• Override/jettison pumps 2 feed engine 1
• Override/jettison pumps 3 feed engine 4.
• Main pumps 2 and 3 feed their related engine.
