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Title of test: B737 Fuel System Description: B737 Fuel System Author: Boeing Other tests from this author Creation Date: 20/06/2024 Category: Others Number of questions: 21

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Center fuel tank fuel is used before main tank fuel because: center tank check valves open at a lower differential pressure than main tank check valves. center tank check valves open at a higher differential pressure than main tank check valves. center tank fuel pumps produce higher pressure than main tank pumps. main tank pumps cannot produce pressure until the center tank LOW PRESSURE lights illuminate and the center tank pumps are turned OFF. . 2) The engine fuel shutoff valves: are controlled by both the engine fire warning switch and the engine start lever; however, the spar fuel shutoff valves are controlled only be the engine start lever. are the only fuel shutoff valves with an associated blue light on the forward overhead fuel panel. and the spar fuel shutoff valves require AC power to operate. and the spar fuel shutoff valves close whenever their respective engine fire wanting switch is pulled or engine start lever is placed to CUTOFF. The center tank scavenge jet pump operates when: both center tank fuel pump switches turned OFF. the No. 1 main fuel tank is about half full and the main tank No. 1 forward pump is operating. the center fuel tank is about 3/4 full. either engine is operating. . The fuel quantity indication system: calculates and displays total fuel quantity. calculates the usable fuel quantity in each tank. displays fuel quantity analogue format only. calculates the usable fuel quantity in the main tanks. The capacity or the center tank is greater than the capacity of the two main fuel tanks combined. True False. There are CDS fuel alert indications for: fuel quantity flow in the main tank, impending fuel filter bypass, more than 453 kg per hour fuel flow difference between engines fuel quantity less than 907 kg in a main tank, both center tank fuel pumps producing low or no pressure with greater than 726 kg in the center tank, greater than 453 kg fuel difference between main tanks. fuel quantity low in center or main tank, either center tank fuel pump producing low or no pressure with greater than 726 kg fuel in the center tank, excessive fuel flow difference between engines. any fuel pump producing low or no pressure with the pump switch on, impending fuel filter bypass, greater than 453 kg fuel quantity difference between main tanks. . During cruise, both center tank fuel pumps have failed and the center tank fuel pump switches are OFF. You still have 320 kg of fuel in the center tank and both main tanks are full. The Upper Display Unit will show: a LOW indication. a CONFIG indication. a pump LOW PRESSURE indication. None of the above are correct. . You have 2500 kg of fuel in the No.1 main tank and 3060 kgs of fuel in the No. 2 main tank. You will see: a LOW indication below main tank No. 1 accompanied by a Master Caution light and system annunciation for fuel. an IMBAL indication below main tank No. 1 accompanied by a Master Caution light and system annunciation for fuel. an IMBAL indication below main tank No. 1 with no Master Caution light and no system annunciation for fuel the fuel quantity arc and digits on main tank No. 2 turn amber. . In flight, below FL300, two fuel pump LOW PRESSURE lights for the No.1 tank illuminate. What happens to the No.1 engine? It receives fuel from main tank No. 2 automatically. . It will shut down due to fuel starvation. It will continue to operate. Mechanical engine-driven fuel pumps provide suction feed in the event that normal electrical fuel pump operation is not available. It continues to operate using fuel through the center tank bypass valve. For landing, what is the maximum fuel imbalance between No.1 and No.2 main tanks? 453 kgs 500 kgs 590 kgs 680 kgs. In which fuel tanks are bypass valves located? The center tank. Both main tanks. All tanks. No tanks. What does an illuminated main tank fuel pump LOW PRESSURE light indicate Low fuel pressure in the affected tank Low pressure in the fuel manifold. The fuel pump output pressure is low. The fuel pump switch is OFF Both c and d are correct. What is the condition of the VALVE OPEN light when the crossfeed selector is positioned OPEN and the crossfeed valve is closed? Illuminated dim blue. Illuminated bright blue. Illuminated amber. Extinguished. . What is the source of electrical power for the engine fuel shutoff valves? The Hot Battery Bus. The Battery Bus. The DC Standby Bus. The AC Standby Bus. . Ground transfer of fuel between the tanks: is accomplished at the wing fueling station. is accomplished from the fuel control panel. is not possible can only be accomplished if the center tank contains more than 3850 kg fuel. During fuel balancing operations, fuel pump pressure should be supplied at all time. Without fuel pump pressure, thrust deterioration or engine flameout may occur above which altitude? 20,000 feet. 25,000 feet At high altitude 35,000 feet. If the fuel quantity indication system is inoperative manually compute VREF and enter it in the CDU manually set VREF with the SPD REF switch. VREF will not be available. Enter and periodically update manually calculated fuel weight on the FMC PERF INIT page. . In flight, below FL300, two fuel pump LOW PRESSURE lights for the No.1 tank illuminate. What happens to the No. 1 engine It receives fuel from main tank No.2 automatically It will shut down due to fuel starvation. It will continue to operate using the bypass valve for engine #1 It continues to operate using fuel through the center tank bypass valve. Fueling can be accomplished from over-wing tanks; True False. During cruise, you get LOW PRESSURE indications on centre tank pumps #1 and #2. You still have 700 Ibs. (320 kg.) of fuel in the centertank and both main tanks are full. The Upper Display Unit will show LOW indication. CONFIG indication. a pump LOW PRESSURE indication. None of the above are correct. What is the source of fuel for the APU? What is the source of fuel for the APU? The center tank Left main tank Both A an C are correct.

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