B737-300-ATA 28-fuel.ppt

PT. METRO BATAVIA
Directorate of Operational
Slide 1 of 83
737-300/400
FUEL
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PT. METRO BATAVIA
Slide 2 of 83
737-300/400 Fuel Schematic
To APU
APU fuel
shutoff
valve
APU bypass
valve
Bypass
valve
No. 1
fuel tank
No. 1
engine
No. 2
engine
Engine driven
fuel pump
Bypass
valve
Center fuel tank
No. 2
fuel tank
Engine fuel
shutoff valve
Engine driven
fuel pump
Engine fuel
shutoff valve
Manual defueling valve
Center left
pump
Center right
pump
No. 2 fwd
pump
No. 2 aft
pump
Center right
pump inlet
Center left
pump inlet
No. 1 fwd
pump
No. 1 aft
pump
Fueling receptacle
When pulled,
closes No. 1 engine
fuel shutoff valve
When pulled,
closes No. 2 engine
fuel shutoff valve
Fuel temperature
indicator
Pressure fueling
station
Surge tank
Surge tank
Crossfeed valve
Scavenge
valve
Scavenge
inlet
Center tank
scavenge jet
pump
Fuel shutoff
valves (3)

PT. METRO BATAVIA
Slide 3 of 83
No. 1
fuel tank Center fuel tank
No. 2
fuel tank
There are three fuel tanks: No. 1, Center, and No. 2. The No. 1 and No. 2
fuel tanks are located in the interspar area of each wing. The center fuel
tank is contained in the fuselage (wing center section).

PT. METRO BATAVIA
Slide 4 of 83
No. 1
No. 2
fuel tank
A pressure fueling station is installed on the right wing leading
edge. A fueling receptacle allows a hose to be connected for
fueling. Shutoff valves control fuel distribution to the tanks.
Fueling receptacle
Pressure fueling
station
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Fuel shutoff
valves (3)

PT. METRO BATAVIA
Slide 5 of 83
One surge tank can be found outboard of each wing fuel tank. Vent channels allow the surge tanks to collect any fuel
overflow from the main tanks. A surge tank drain line then allows the fuel overflow to drain back into the center tank, but
prevents fuel flow from the center tank to the surge tank. Each surge tank has a capacity of approximately 30 U.S. gallons.
Surge tank
Surge tank
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Fueling receptacle
Pressure fueling
station
Fuel shutoff
valves (3)

PT. METRO BATAVIA
Slide 6 of 83
A fuel vent scoop is located on each outboard lower wing surface, under the surge tank. The scoops create positive pressure
during flight and are the overboard vents for the vent system. If a significant amount of overflow fuel is collected in a surge
tank, the fuel will be discharged overboard via the vent scoops. The scoops are designed to prevent ice accumulation.
See picture of
fuel vent scoop
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
Fuel shutoff
valves (3)

PT. METRO BATAVIA
Slide 7 of 83
The No. 1 fuel tank contains a forward and aft fuel boost pump. Each pump is AC powered and is fuel
cooled and lubricated. The forward pump is attached to the forward wing spar and the aft pump is installed
in a dry bay within the fuel tank. The wing spar and dry bay isolate the pump motor from the fuel in the tank.
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
Fuel shutoff
valves (3)
No. 1 fwd
pump
No. 1 aft
pump

PT. METRO BATAVIA
Slide 8 of 83
Fuel from the tank enters each pump through a wire mesh screen via a suction tube inlet. Fuel is
discharged from the pump under pressure through the boost pump check valve. The check valves are
located inside the fuel tank and will open when respective fuel pump pressure is approximately 12 psi.
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
Fuel shutoff
valves (3)
No. 1 fwd
pump
No. 1 aft
pump

PT. METRO BATAVIA
Slide 9 of 83
The No. 1 tank fuel LOW PRESSURE lights will illuminate when the respective fuel
pump switch is ON and fuel boost pump pressure is low. The LOW PRESSURE
lights will also illuminate when the respective fuel pump switch is OFF.
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Fuel shutoff
valves (3)

PT. METRO BATAVIA
Slide 10 of 83
Engine fuel
shutoff valve
When pulled,
closes No. 1 engine
fuel shutoff valve
Prior to fuel entering the No. 1 engine, it must first pass through the engine fuel shutoff valve. The valve is
electrically (DC) opened when the No. 1 engine start lever is positioned from CUTOFF to IDLE. The valve closes when
the start lever is lowered from IDLE to CUTOFF. The valve also closes when the No. 1 engine fire switch is pulled.
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Fuel shutoff
valves (3)

PT. METRO BATAVIA
Slide 11 of 83
From the engine fuel shutoff valve, fuel is delivered to
the No. 1 engine via the main engine control (MEC).
No. 1
engine
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 1 engine
fuel shutoff valve
Fuel shutoff
valves (3)

PT. METRO BATAVIA
Slide 12 of 83
A bypass valve allows fuel to be drawn out of the tank by an engine driven
fuel pump. This would only occur if both No. 1 fuel tank pumps were to
fail. The engine driven fuel pump is attached to the engine gearbox.
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 1 engine
fuel shutoff valve
No. 1
engine
Fuel shutoff
valves (3)
Bypass
valve
Engine driven
fuel pump

PT. METRO BATAVIA
Slide 13 of 83
A fuel temperature sensor is located in the No. 1 fuel tank.
The fuel temperature indicator displays the results in °C.
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 1 engine
fuel shutoff valve
No. 1
engine
Bypass
valve
Engine driven
fuel pump
Fuel shutoff
valves (3)
Fuel temperature
indicator

PT. METRO BATAVIA
Slide 14 of 83
The No. 2 fuel tank contains a forward and aft fuel boost pump. Each pump is AC powered and is fuel
cooled and lubricated. The forward pump is attached to the forward wing spar and the aft pump is installed
in a dry bay within the fuel tank. The wing spar and dry bay isolate the pump motor from the fuel in the tank.
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 1 engine
fuel shutoff valve
No. 1
engine
Bypass
valve
Engine driven
fuel pump
Fuel temperature
indicator
Fuel shutoff
valves (3)
No. 2 fwd
pump
No. 2 aft
pump

PT. METRO BATAVIA
Slide 15 of 83
Fuel from the tank enters each pump through a wire mesh screen via a suction tube inlet. Fuel is
located inside the fuel tank and will open when respective fuel pump pressure is approximately 12 psi.
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 1 engine
fuel shutoff valve
No. 1
engine
Bypass
valve
Engine driven
fuel pump
Fuel temperature
indicator
Fuel shutoff
valves (3)
No. 2 fwd
pump
No. 2 aft
pump

PT. METRO BATAVIA
Slide 16 of 83
The No. 2 tank fuel LOW PRESSURE lights will illuminate when the respective fuel
lights will also illuminate when the respective fuel pump switch is OFF.
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 1 engine
fuel shutoff valve
No. 1
engine
Bypass
valve
Engine driven
fuel pump
Fuel temperature
indicator
No. 2 fwd
pump
No. 2 aft
pump
Fuel shutoff
valves (3)

PT. METRO BATAVIA
Slide 17 of 83
Engine fuel
shutoff valve
When pulled,
closes No. 2 engine
fuel shutoff valve
Prior to fuel entering the No. 2 engine, it must first pass through the engine fuel shutoff valve. The valve is
electrically (DC) opened when the No. 2 engine start lever is positioned from CUTOFF to IDLE. The valve closes when
the start lever is lowered from IDLE to CUTOFF. The valve also closes when the No. 2 engine fire switch is pulled.
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 1 engine
fuel shutoff valve
No. 1
engine
Bypass
valve
Engine driven
fuel pump
Fuel temperature
indicator
No. 2 fwd
pump
No. 2 aft
pump
Fuel shutoff
valves (3)

PT. METRO BATAVIA
Slide 18 of 83
From the engine fuel shutoff valve, fuel is delivered to
the No. 2 engine via the main engine control (MEC).
No. 2
engine
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 1 engine
fuel shutoff valve
No. 1
engine
Bypass
valve
Engine driven
fuel pump
Fuel temperature
indicator
No. 2 fwd
pump
No. 2 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 2 engine
fuel shutoff valve
Fuel shutoff
valves (3)

PT. METRO BATAVIA
Slide 19 of 83
A bypass valve allows fuel to be drawn out of the tank by an engine driven
fuel pump. This would only occur if both No. 2 fuel tank pumps were to
fail. The engine driven fuel pump is attached to the engine gearbox.
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 1 engine
fuel shutoff valve
No. 1
engine
Bypass
valve
Engine driven
fuel pump
Fuel temperature
indicator
No. 2 fwd
pump
No. 2 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 2 engine
fuel shutoff valve
No. 2
engine
Fuel shutoff
valves (3)
Bypass
valve
Engine driven
fuel pump

PT. METRO BATAVIA
Slide 20 of 83
The DC powered crossfeed valve connects the left and right fuel manifold.
It provides a means of directing fuel to either engine from any tank.
Crossfeed valve
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 1 engine
fuel shutoff valve
No. 1
engine
Bypass
valve
Engine driven
fuel pump
Fuel temperature
indicator
No. 2 fwd
pump
No. 2 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 2 engine
fuel shutoff valve
No. 2
engine
Bypass
valve
Engine driven
fuel pump
Fuel shutoff
valves (3)

PT. METRO BATAVIA
Slide 21 of 83
The center fuel tank utilizes the left and right fuel boost pump. Each pump is AC powered and is fuel cooled
and lubricated. The center left pump is installed in a dry bay within the No. 1 fuel tank. The center right pump is
installed in a dry bay within the No. 2 fuel tank. The dry bay isolates the pump motor from the fuel in the tank.
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 1 engine
fuel shutoff valve
No. 1
engine
Bypass
valve
Engine driven
fuel pump
Fuel temperature
indicator
No. 2 fwd
pump
No. 2 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 2 engine
fuel shutoff valve
No. 2
engine
Bypass
valve
Engine driven
fuel pump
Crossfeed valve
Fuel shutoff
valves (3)
Center left
pump
Center right
pump

PT. METRO BATAVIA
Slide 22 of 83
Fuel from the center tank enters each pump through a wire mesh screen via a suction tube inlet. Fuel is
located inside the fuel tank and will open when respective fuel pump pressure is approximately 1.3 psi.
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 1 engine
fuel shutoff valve
No. 1
engine
Bypass
valve
Engine driven
fuel pump
Fuel temperature
indicator
No. 2 fwd
pump
No. 2 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 2 engine
fuel shutoff valve
No. 2
engine
Bypass
valve
Engine driven
fuel pump
Crossfeed valve
Fuel shutoff
valves (3)
Center left
pump inlet
Center right
pump inlet
Center left
pump
Center right
pump

PT. METRO BATAVIA
Slide 23 of 83
As previously stated, the main tank and center tank check valves open at a boost pump pressure of approximately
12 and 1.3 psi, respectively. Therefore, assuming fuel in all three tanks and all six pumps operating, fuel is
delivered to the engines from the center tank first due to the lower “cracking” pressure of the check valves.
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 1 engine
fuel shutoff valve
No. 1
engine
Bypass
valve
Engine driven
fuel pump
Fuel temperature
indicator
No. 2 fwd
pump
No. 2 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 2 engine
fuel shutoff valve
No. 2
engine
Bypass
valve
Engine driven
fuel pump
Crossfeed valve
Center left
pump inlet
Center right
pump inlet
Center left
pump
Center right
pump
Fuel shutoff
valves (3)

PT. METRO BATAVIA
Slide 24 of 83
The center tank fuel LOW PRESSURE lights will illuminate when the respective fuel
lights will extinguish when the respective fuel pump switch is OFF.
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 1 engine
fuel shutoff valve
No. 1
engine
Bypass
valve
Engine driven
fuel pump
Fuel temperature
indicator
No. 2 fwd
pump
No. 2 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 2 engine
fuel shutoff valve
No. 2
engine
Bypass
valve
Engine driven
fuel pump
Crossfeed valve
Center left
pump inlet
Center right
pump inlet
Center left
pump
Center right
pump
Fuel shutoff
valves (3)

PT. METRO BATAVIA
Slide 25 of 83
A center tank fuel scavenge system is installed to drain unusable fuel from the center tank into
the No. 1 tank. This occurs when both center tank pump switches are positioned to OFF. This
action sends an electrical signal to the scavenge valve to open for a time period of 20 minutes.
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 1 engine
fuel shutoff valve
No. 1
engine
Bypass
valve
Engine driven
fuel pump
Fuel temperature
indicator
No. 2 fwd
pump
No. 2 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 2 engine
fuel shutoff valve
No. 2
engine
Bypass
valve
Engine driven
fuel pump
Crossfeed valve
Center left
pump inlet
Center right
pump inlet
Center left
pump
Center right
pump
Fuel shutoff
valves (3)
Scavenge
inlet
Scavenge
valve
Center tank
scavenge jet
pump

PT. METRO BATAVIA
Slide 26 of 83
With the scavenge valve now open, fuel from the No. 1 fwd pump flows to the center tank scavenge jet pump. This results in low pressure being
created in the scavenge inlet. Remaining fuel in the center tank is now drawn out and drained into the No. 1 tank. The scavenge valve will close
at the end of 20 minutes. The scavenge valve may be re-opened, for 20 minutes, by cycling the center pump switches to ON and back OFF.
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 1 engine
fuel shutoff valve
No. 1
engine
Bypass
valve
Engine driven
fuel pump
Fuel temperature
indicator
No. 2 fwd
pump
No. 2 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 2 engine
fuel shutoff valve
No. 2
engine
Bypass
valve
Engine driven
fuel pump
Crossfeed valve
Center left
pump inlet
Center right
pump inlet
Center left
pump
Center right
pump
Scavenge
inlet
Scavenge
valve
Center tank
scavenge jet
pump
Fuel shutoff
valves (3)

PT. METRO BATAVIA
Slide 27 of 83
Fuel may be delivered to the APU from any one of the three tanks. The APU fuel shutoff
valve controls delivery of fuel to the APU. The valve is opened and closed by the APU
start switch. Pulling the APU fire switch will also close the APU fuel shutoff valve.
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 1 engine
fuel shutoff valve
No. 1
engine
Bypass
valve
Engine driven
fuel pump
Fuel temperature
indicator
No. 2 fwd
pump
No. 2 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 2 engine
fuel shutoff valve
No. 2
engine
Bypass
valve
Engine driven
fuel pump
Crossfeed valve
Center left
pump inlet
Center right
pump inlet
Center left
pump
Center right
pump
Scavenge
inlet
Scavenge
valve
Fuel shutoff
valves (3)
To APU
APU fuel
shutoff
valve
Center tank
scavenge jet
pump

PT. METRO BATAVIA
Slide 28 of 83
With no AC power available to the aircraft, all six fuel pumps are inoperative. If attempting to start the APU with no AC power on
the aircraft, the fuel pumps are not available to feed fuel to the APU. Therefore, an APU bypass valve is located in the No. 1 fuel
tank which allows fuel to be drawn out of the tank for APU operation. The APU cannot draw fuel out of the No. 2 or center tank.
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 1 engine
fuel shutoff valve
No. 1
engine
Bypass
valve
Engine driven
fuel pump
Fuel temperature
indicator
No. 2 fwd
pump
No. 2 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 2 engine
fuel shutoff valve
No. 2
engine
Bypass
valve
Engine driven
fuel pump
Crossfeed valve
Center left
pump inlet
Center right
pump inlet
Center left
pump
Center right
pump
Scavenge
inlet
Scavenge
valve
To APU
APU fuel
shutoff
valve
Center tank
scavenge jet
pump
Fuel shutoff
valves (3)
APU bypass
valve

PT. METRO BATAVIA
Slide 29 of 83
The manual defueling valve is located inboard of the pressure fueling station on the right wing front spar. It controls fuel flow from the fuel
manifold to the pressure fueling station. It is used to defuel any one of the three tanks, or to transfer fuel from tank to tank (on the ground
only). The handle of the defueling valve is such that its access door cannot be closed when the defueling valve is in the open position.
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 1 engine
fuel shutoff valve
No. 1
engine
Bypass
valve
Engine driven
fuel pump
Fuel temperature
indicator
No. 2 fwd
pump
No. 2 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 2 engine
fuel shutoff valve
No. 2
engine
Bypass
valve
Engine driven
fuel pump
Crossfeed valve
Center left
pump inlet
Center right
pump inlet
Center left
pump
Center right
pump
Scavenge
inlet
Scavenge
valve
To APU
APU fuel
shutoff
valve
Center tank
scavenge jet
pump
APU bypass
valve
Fuel shutoff
valves (3)

PT. METRO BATAVIA
Slide 30 of 83
Although not shown in the schematic above, overwing fill ports (for gravity fueling) are provided for the No. 1 and No.
2 fuel tanks. These receptacles would be utilized if pressure fueling facilities are not available. If fuel is desired in the
center tank during this type of scenario, fuel must be transferred from the main tanks via the manual defueling valve.
No. 1
No. 2
fuel tank
No. 2
fuel tank
Center fuel tank
No. 1
fuel tank
Surge tank
Surge tank
Fueling receptacle
Pressure fueling
station
No. 1 fwd
pump
No. 1 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 1 engine
fuel shutoff valve
No. 1
engine
Bypass
valve
Engine driven
fuel pump
Fuel temperature
indicator
No. 2 fwd
pump
No. 2 aft
pump
Engine fuel
shutoff valve
When pulled,
closes No. 2 engine
fuel shutoff valve
No. 2
engine
Bypass
valve
Engine driven
fuel pump
Crossfeed valve
Center left
pump inlet
Center right
pump inlet
Center left
pump
Center right
pump
Scavenge
inlet
Scavenge
valve
To APU
APU fuel
shutoff
valve
Center tank
scavenge jet
pump
APU bypass
valve
Fuel shutoff
valves (3)
This concludes the review of the Fuel Schematic. The next section
will discuss various fueling related panels. Click Next to continue.

PT. METRO BATAVIA
Slide 31 of 83
Fuel Control Panel
Forward Overhead Panel

PT. METRO BATAVIA
Slide 32 of 83
Fuel Control Panel
FUEL VALVE CLOSED lights:
Illuminated bright blue –
• Related engine fuel shutoff valve in transit.
• Related engine fuel shutoff valve position
disagrees with start lever or engine fire warning
switch position.
Illuminated dim blue –
• Related engine fuel shutoff valve is closed.
Extinguished –
• Related engine fuel shutoff valve is open.

PT. METRO BATAVIA
Slide 33 of 83
Fuel Control Panel
FUEL TEMP Indicator:
Indicates fuel temperature in the No. 1
fuel tank only.

PT. METRO BATAVIA
Slide 34 of 83
Fuel Control Panel
FILTER BYPASS Lights:
Illuminated –
Impending fuel filter bypass on respective engine
due to a contaminated filter.
Note: During a FILTER BYPASS, fuel is routed
around the filter and delivered to the engine
unfiltered.

PT. METRO BATAVIA
Slide 35 of 83
Fuel Control Panel
CROSSFEED Selector:
Controls fuel crossfeed valve.
Open –
Connects left and right fuel manifold.
Closed –
Isolates left and right fuel manifold.

PT. METRO BATAVIA
Slide 36 of 83
Fuel Control Panel
Crossfeed VALVE OPEN light:
Illuminated bright blue –
• Crossfeed valve in transit.
• Crossfeed valve and CROSSFEED selector
disagree.
Illuminated dim blue –
• Crossfeed valve is open.
Extinguished –
• Crossfeed valve is closed.

PT. METRO BATAVIA
Slide 37 of 83
Fuel Control Panel
CTR Tank Fuel Pump Switches (L and R):
ON –
Activates respective center tank fuel pump.
OFF –
Deactivates respective center tank fuel pump.

PT. METRO BATAVIA
Slide 38 of 83
Fuel Control Panel
Center Tank Fuel Pump LOW PRESSURE Lights:
Illuminated –
Respective fuel pump switch is ON and output
pressure is low.
Extinguished –
• Respective fuel pump switch is ON and output
pressure is normal.
• Respective fuel pump switch is OFF.

PT. METRO BATAVIA
Slide 39 of 83
Fuel Control Panel
Main Tank Fuel Pump Switches (FWD and AFT):
ON –
Activates respective main tank fuel pump.
OFF –
Deactivates respective main tank fuel pump.

PT. METRO BATAVIA
Slide 40 of 83
Fuel Control Panel
Main Tank Fuel Pump LOW PRESSURE Lights:
Illuminated –
pressure is low.
• Respective fuel pump switch is OFF.
Extinguished –
pressure is normal.

PT. METRO BATAVIA
Slide 41 of 83
Fuel Quantity Indications
Instrument Panels

PT. METRO BATAVIA
Slide 42 of 83
Fuel Quantity Indicators:
• Indicates total weight of usable fuel in respective
tank.
• AC standby power is required.
• Segmented arc indicates fuel quantity as a
percentage of fuel capacity.
Note: There are many different types of fuel
quantity indicators. The type installed in your
aircraft may not necessarily match the type
discussed in this presentation. The type shown
here is manufactured by Simmonds®.

PT. METRO BATAVIA
Slide 43 of 83
ERR Indicator:
• ERR appears with associated error codes (0-9)
whenever a malfunction occurs.
• Used for maintenance purposes only

PT. METRO BATAVIA
Slide 44 of 83
Fuel QTY TEST Switch:
Press and hold –
• Fuel quantity indicators display a value of “0”.
• “ERR 4” is shown.
When switch is released, a self test is initiated –
• All segments of the indicators display for two
seconds.
• All segments of the indicators extinguish for two
seconds.
• Indicators display full tank capacity and stored
error codes, if any, for two seconds.
• Indicators return to actual fuel quantity.

PT. METRO BATAVIA
Slide 45 of 83
Measurement/Fueling/Defueling
Dripstick
(five on each wing)
Pressure fueling station
Defueling valve
See picture of
fuel tank access panel
and dripstick head

PT. METRO BATAVIA
Slide 46 of 83
Fuel Measuring Stick:
• Utilized to measure fuel quantity in the No. 1 and
No. 2 fuel tanks. No dripsticks associated with
the center fuel tank.
• Allows a comparison of fuel weight (as indicated
by the fuel quantity indicators) to the value
shown on the measuring sticks to ensure the
indicators are operating normally.
• Five sticks installed on each main tank.
• Reading is obtained by turning the head of the
dripstick 90° in a counter-clockwise direction.
Slowly lower the stick until fuel begins to “drip”
from the hole located near the bottom of the
stick. Quantity may now be determined by
reading the measuring units on the stick. This
procedure is best performed by trained
maintenance personnel.

PT. METRO BATAVIA
Slide 47 of 83
Pressure Fueling Station:
• Provides all the necessary switches,
indicators, and valves to quickly fuel all three
tanks.
• Located on right wing, aft of leading edge
slats.

PT. METRO BATAVIA
Slide 48 of 83
Fueling Receptacle:
Connects the fueling hose to the pressure
fueling system.

PT. METRO BATAVIA
Slide 49 of 83
Fueling Shutoff Valves:
• Controls fuel distribution to their respective tank.
• Electrically (DC) activated.
• Solenoid actuated, spring-loaded to the closed
position.
Left-half of pressure fueling station

PT. METRO BATAVIA
Slide 50 of 83
Manual Override Push Buttons (Solenoid Override):
• Utilized if DC power is not available to the fueling
shutoff valves.
• Mechanically opens shutoff valve when fuel
pressure is supplied.

PT. METRO BATAVIA
Slide 51 of 83
Fueling Power Control Switch:
Door closed –
Proximity sensor deactivates DC power to fueling
valve switches and panel floodlights. Also
deactivates AC power to refuel quantity indicators.
Door open –
Proximity sensor allows DC power to fueling valve
switches and panel floodlights. Also allows AC
power to the refuel quantity indicators.

PT. METRO BATAVIA
Slide 52 of 83
Test Gauges and Fueling Panel:
Used by fueling personnel to coordinate the
distribution of fuel to the tanks.
Right-half of pressure fueling station

PT. METRO BATAVIA
Slide 53 of 83
Fueling Valve Switches:
OPEN –
Energizes fueling shutoff valve for respective tank.
CLOSED –
De-energizes fueling shutoff valve for respective
tank.

PT. METRO BATAVIA
Slide 54 of 83
Fueling VALVE POSITION LIGHTS:
Illuminated –
• Respective fueling valve switch in in the OPEN
position and the related tank is not full.
Extinguished –
• Respective fueling valve switch in in the OPEN
position and the related tank is full.
• Respective fueling valve switch is in the CLOSED
position.

PT. METRO BATAVIA
Slide 55 of 83
Refuel Quantity Indicators:
Indicates total weight of usable fuel in respective
tank.

PT. METRO BATAVIA
Slide 56 of 83
TEST GAUGES and FUELING CONTROL Switch:
(spring-loaded to OFF)
TEST GAUGES –
Checks the operation of the refuel quantity
indicators by performing a self-test.
AUX POWER FUELING CONTROL –
Energizes the fueling system if the fueling power
control switch should fail to operate when the
fueling door is open.

PT. METRO BATAVIA
Slide 57 of 83
Manual Defueling Valve:
Open –
Connects fuel manifold to pressure fueling station
for defueling or to transfer fuel from tank to tank.
Transferring of fuel from tank to tank can only be
performed while the aircraft is on the ground.
Closed (picture shows handle in closed position) –
Isolates fuel manifold from pressure fueling
station.
Note: The handle of the defueling valve is such
that its access door cannot be closed when the
defueling valve is in the open position.
This concludes the review of the fueling related panels. The remainder
of the presentation will discuss more details of the fuel system.
Click Next to continue.

PT. METRO BATAVIA
Slide 58 of 83
Fuel Pump LOW PRESSURE Lights
The fuel pump switches normally
remain in the OFF position until the
pumps are needed.
With the No. 1 and No. 2 tank fuel pump
switches in the OFF position, it is
normal for LOW PRESSURE lights to be
illuminated.
With the center tank fuel pump switches
in the OFF position, it is normal for
LOW PRESSURE lights to be
extinguished. The reason for this is
because the center tank is not always
scheduled to be fueled. Therefore, the
pumps are not utilized and the pump
switches are selected OFF. The LOW
PRESSURE lights would be a nuisance
to the pilots if they were to remain
illuminated with the center pump
switches in the OFF position.

PT. METRO BATAVIA
Slide 59 of 83
The following assumes all six fuel
pumps are operating normally and all
three tanks have been fueled:
When the No. 1 and No. 2 tank pumps
are selected ON, the LOW PRESSURE
lights extinguish.
When the center tank pumps are
selected ON, the LOW PRESSURE lights
remain extinguished.
Recall that with all six pumps operating,
fuel is delivered to the engines from the
center tank first.

PT. METRO BATAVIA
Slide 60 of 83
The following scenarios will
demonstrate the relationship between
the fuel LOW PRESSURE lights and the
master caution system.
Let’s first discuss the LOW PRESSURE
lights in the center fuel tank.
When their illumination results in a Master Caution

PT. METRO BATAVIA
Slide 61 of 83
Let’s assume that the center left pump
has failed. Because the pump is no
longer a provider of fuel pressure, the
respective LOW PRESSURE light
illuminates. This does not result in a
MASTER CAUTION because with both
center pumps ON, both LOW
PRESSURE lights must be illuminated
in order for the MASTER CAUTION and
FUEL annunciator lights to
automatically illuminate.
As a result of the center left pump
failure, the No. 1 tank pumps will begin
to feed the No. 1 engine. However, it is
likely that the non-normal procedure
will suggest opening the crossfeed
valve to allow the center right pump to
deplete center tank fuel. This will also
help to prevent a fuel imbalance
(reference your company operations
manual).
MASTER CAUTION and left
system annunciator panel

PT. METRO BATAVIA
Slide 62 of 83
If a pilot were to push either system
annunciator panel, the MASTER
CAUTION and FUEL annunciator would
illuminate to warn the pilots of the low
pressure situation in the center left
pump.
Note: The system annunciator panels
are also known as “recall” panels.

PT. METRO BATAVIA
Slide 63 of 83
The master caution system may be
reset by simply depressing either
MASTER CAUTION – PUSH TO RESET
light.

PT. METRO BATAVIA
Slide 64 of 83
When the pilot selects the center left
pump switch OFF, the LOW PRESSURE
light extinguishes.

PT. METRO BATAVIA
Slide 65 of 83
Now, let’s assume that the center right
pump has failed. The respective LOW
PRESSURE light illuminates. The
MASTER CAUTION and FUEL
annunciator lights also illuminate. With
one center pump ON and one center
pump OFF, the illumination of one LOW
PRESSURE light will automatically
illuminate the MASTER CAUTION and
FUEL annunciator.
In this scenario, fuel is no longer being
delivered to the engines from the center
tank, and therefore the pumps in the
No. 1 and No. 2 tank will automatically
begin to feed the engines.

PT. METRO BATAVIA
Slide 66 of 83
When the pilot selects the center right
pump switch OFF, the LOW PRESSURE
light extinguishes.

PT. METRO BATAVIA
Slide 67 of 83
light.
This concludes the discussion of the
LOW PRESSURE lights in the center
tank. The LOW PRESSURE lights in the
No. 1 tank will be discussed next.

PT. METRO BATAVIA
Slide 68 of 83
Let’s assume that the AFT pump in the
No. 1 tank has failed. Because the
pump is no longer a provider of fuel
pressure, the respective LOW
PRESSURE light illuminates. This does
not result in a MASTER CAUTION
because both LOW PRESSURE lights in
the No. 1 fuel tank must be illuminated

PT. METRO BATAVIA
Slide 69 of 83
pressure situation in the No. 1 tank AFT
pump.

PT. METRO BATAVIA
Slide 70 of 83
light.

PT. METRO BATAVIA
Slide 71 of 83
When the pilot selects the No. 1 tank
AFT pump switch OFF, the LOW
PRESSURE light remains illuminated.

PT. METRO BATAVIA
Slide 72 of 83
Now, let’s assume that the FWD pump in
the No. 1 tank has failed. The
illuminates. The MASTER CAUTION
and FUEL annunciator lights also
illuminate because both LOW
PRESSURE lights in the No. 1 fuel tank
are illuminated.
The No. 1 engine would continue to run
because the engine driven fuel pump is
drawing fuel out of the No. 1 tank via the
bypass valve.

PT. METRO BATAVIA
Slide 73 of 83
FWD pump switch OFF, the LOW

PT. METRO BATAVIA
Slide 74 of 83
light.
LOW PRESSURE lights in the No. 1
tank. The LOW PRESSURE lights in the
No. 2 tank will be discussed next. You
will discover that the No. 1 and No. 2
tank LOW PRESSURE lights function
exactly the same.

PT. METRO BATAVIA
Slide 75 of 83
Let’s assume that the AFT pump in the
No. 2 tank has failed. Because the
pump is no longer a provider of fuel
pressure, the respective LOW
PRESSURE light illuminates. This does
not result in a MASTER CAUTION
because both LOW PRESSURE lights in
the No. 2 fuel tank must be illuminated

PT. METRO BATAVIA
Slide 76 of 83
pressure situation in the No. 2 tank AFT
pump.

PT. METRO BATAVIA
Slide 77 of 83
light.

PT. METRO BATAVIA
Slide 78 of 83
AFT pump switch OFF, the LOW

PT. METRO BATAVIA
Slide 79 of 83
Now, let’s assume that the FWD pump in
the No. 2 tank has failed. The
illuminates. The MASTER CAUTION
and FUEL annunciator lights also
illuminate because both LOW
PRESSURE lights in the No. 2 fuel tank
are illuminated.
The No. 2 engine would continue to run
because the engine driven fuel pump is
drawing fuel out of the No. 2 tank via the
bypass valve.

PT. METRO BATAVIA
Slide 80 of 83
FWD pump switch OFF, the LOW

PT. METRO BATAVIA
Slide 81 of 83
light.
LOW PRESSURE lights in the No. 2
tank.

PT. METRO BATAVIA
Slide 82 of 83
Fuel Pump Power Sources
MAIN BUS 1
TRANSFER BUS 1 TRANSFER BUS 2
MAIN BUS 2
MAIN BUS 1
MAIN BUS 2

PT. METRO BATAVIA
Slide 83 of 83
Fuel Tank Capacities
No. 1 tank No. 2 tank
Center
tank
1,499 U.S. gallons
10,118 pounds*
4,650 KG
*Fuel density assumed to be 6.75lbs/gallon
1,499 U.S. gallons
10,118 pounds*
4,650 KG
2,313 U.S.
gallons
15,613
pounds*
7.176 KG
These figures represent the approximate amount of useable fuel. Weight and balance
calculations and the appropriate loading manual will give exact figures for your
specific aircraft and condition.

B737-300-ATA 28-fuel.ppt

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