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49 Cards in this Set
- Front
- Back
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Classics only: When both Centre Tank Fuel pump switches are turned OFF, the fuel scavenge shut-off valve
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Opens for 20 minutes allowing fuel pressure from the No. 1 tank forward pump to operate the Centre Tank Scavenge Jet pump, which transfers the remaining centre tank fuel to the No. 1 tank.
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A shut-off system is used during refuelling to
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Automatically close the fuelling valve in each fuel tank when the tank is full.
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Fuel Quantity indicators will display
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An ERR symbol if a malfunction occurs.
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To defuel No. 1 tank
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Select the No. 1 Main tank fuel pumps ON, the Crossfeed valve OPEN and the Manual Defuelling valve OPEN.
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The Fuel Temperature Indicator reads the temperature of the fuel in
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The No. 1 tank.
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The manual De-fuelling valve is located
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Outboard of the No. 2 engine.
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Dripsticks (or Floatsticks) are installed in
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Classics: 5 in each main tank.
NG's: 6 in each main tank and 4 in the centre tank. |
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The Fuelling Valve Position Lights on the External Fueling Panel illuminate (blue) when
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The respective fuelling valve is OPEN.
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When the APU is inoperative and no external power is available, refuelling can be accomplished as follows
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Battery switch ON
Standby Power switch BAT The entire fuel system will operate normally. |
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To defuel No. 2 tank only,
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Select the No. 2 Main tank fuel pumps ON and the Manual Defuelling valve OPEN.
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Fuel for the APU is
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Approximately 164 kg/hr 360lbs/hr with electrics & bleeds at sea level, decreasing to 17 kg/hr 37lbs/hr at high altitude and low loads.
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The Fuel Specification for the CFM56 and APU is
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DERD 2494.
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The Crossfeed valve when OPEN
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Allows fuel transfer from any tank to either engine or APU.
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With failure of all generators, the centre tank fuel
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Cannot be used.
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With no pressure refuelling system available, the aircraft (737 - 1-500 only) can be refuelled by
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Using standard overwing fuelling receptacles for gravity fuelling of the No. 1 and No. 2 tanks only.
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The maximum allowable lateral fuel imbalance between No. 1 and No. 2 tanks is
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1000lbs for all stages of flight.
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Should the indicated fuel quantity in any main tank be 100 lbs or less
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Switch on all main tank fuel pumps and open the crossfeed valve.
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The Crossfeed Selector in the OPEN position
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Connects the engine No 1 and No. 2 fuel feed lines by opening the fuel crossfeed valve.
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The Centre Tank Fuelling Valve Position light on the External Fuelling Panel is
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Blue and is extinguished when the centre tank fuelling valve is closed.
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The External Fuelling Panel is located
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At the Right wing leading edge.
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Each fuel tank contains
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2 AC powered fuel pumps which are fuel cooled and lubricated.
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Which valve connects the fuel (engine) manifold to the fuelling manifold
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The Manual Defuelling valve.
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For a FUEL annunciator and the MASTER CAUTION lights to illuminate, two fuel LOW PRESSURE lights must be illuminated for the
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Same tank.
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The Fuel Quantity Indicators display
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Amount of usable fuel in the related tank, to an accuracy of 2.5% of full scale reading.
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A digital fuel quantity indicator has an accuracy of
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+/- 2.5% of full scale reading.
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The fuel quantity indicators require
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Standby AC power.
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If the centre tank is scheduled to contain more than 1000lbs then
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Main tanks 1 & 2 must be filled first.
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For the centre tank Scavenge Jet Pump to operate
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Classics: The centre tank pumps must be turned OFF and the No1 tank FWD pump must be ON.
NG's: The No1 tank must be about half full and the No1 tank FWD pump must be ON. |
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The Engine Fuel Shut Off valves
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Are Hot Battery Bus powered and may be closed by the engine start lever or the respective engine fire switch.
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Can you use the calculated fuel value shown on the CDU in the event of an inoperative fuel indicator?
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No.
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What is the maximum fuel imbalance during taxi, takeoff, cruise, and landing?
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1000 lbs.
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What should you do in the event the fuel temperature drops below _______ degrees C? Go to a warmer altitude.
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-38
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Do not run an electric hydraulic pump with less than _______ lbs of fuel in the main tank.
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1700
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In the event of an inoperative fuel temperature gauge, use the TAT gauge.
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True.
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How do you scavenge fuel from the center tank?
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Turn the center pumps on then off to open the scavenge valve.
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Do not operate the APU with less than ______ lbs of fuel in the _______ tank.
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300; #1
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The minimum desirable landing fuel takes into account fuel for two go-arounds.
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False.
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What is the electrical power source for the left center tank pump?
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#1 main
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What is required to activate center tank scavenging?
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Center tank pump switches ON then OFF.
#1 FWD pump ON. |
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What is the electrical power source for the right aft boost pump?
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#2 transfer
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What will cause a fuel annunciator light to come on?
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At least two low pressure conditions exist.
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Why do the center tank pumps feed the engines first?
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The center tank one-way check valves open at a lower differential pressure than the main tank valves do.
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Where is the fuel temperature read?
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#1 tank.
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How is the engine fuel heated?
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A fuel/oil heat exchanger.
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Which fuel gauges are the master - the cockpit or the wing fueling panel?
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Cockpit.
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What is the fuel tank capacities?
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Wing - 10,200 lbs; Center - 15,700 lbs.
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Is center tank fuel available in the event of a loss of AC power?
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No.
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The fuel pumps are _____ powered; The fuel pump switches are _____ controlled.
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AC; DC
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What is the maximum allowable difference between the inbound logbook entry and the fuel sheet?
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3%
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