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51 Cards in this Set
- Front
- Back
Fuel system ops limits
Alt: Temp: |
Sea Level to 41,000ft
-40c to 50c |
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Fuel flows from the left/right engine feed tank ___
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to the left/right engine
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Aft/Fwd transfer jet pumps
Location: Purpose: |
Location: Each engine feed tank
Purpose: transfer fuel from wing tanks to the engine feed tank |
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Motive flow for the aft transfer jet pump is normally supplied ___
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by the primary jet pump
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Motive flow for the forward transfer jet pump is supplied automatically on demand ___
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by the boost pump when the fuel level in the engine feed tank drops below the full level
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During normal operation, fuel feed to each engine is ___
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provided by the primary jet pump
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Motive flow for the primary jet pump is ___
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supplied by the engine-driven fuel pump through the motive flow valve
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The boost pump is used during ___
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engine starting, fuel crossfeed, wing tank to feed tank fuel transfer, and as a backup for the primary jet pump
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A fuel shutoff valve in each fuel feed line stops fuel flow to the ___
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engine in case of engine fire or fuel leakage downstream of the valve
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Each fuel filter contains a ___ and ___
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Pressure switch
a bypass valve |
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L/R F FLTR BYPASS
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Filter pressure switch differential exceeds 2.3psi (fuel filter bypass is open)
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Fuel distribution subsystem is powered through the respective
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(Left/Right) Load Bus
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Do not reset a popped circuit breaker ___
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in the fuel system
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Fuel storage subsystem:
Tank storage and supply system |
4 fuel tank in the fuselage and one in each wing
3 vent surge tanks, one in the fuselage and one in each wing Gravity flow plumbing and pressure fuel lines 11 sump drains serve the tanks and fuel lines Gravity and pressure refueling ports and defueling drains |
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Fuel storage subsystem:
Fuel tanks |
Aft cabin
Aft fuselage Two mid tanks Wing: 3 bays, fuel feed chamber (inner bays) |
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The ___ tank is the first to reach empty
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aft cabin
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Wing tanks:
Type/Location Capacity pres/gravity |
Outboard Wing (wing tip)
Center Wing Inboard Wing Fuel feed chamber (inboard wing) Pressure: 204.5gal Gravity 211.5gal Fuel Feed Chamber approx 20gal |
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Fuel system capacity lbs - gal(6.7lbs/gal):
Pressure Gravity |
Pressure 5166lbs 771gal
Gravity 4951lbs 739gal |
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The fuel system uses four electric pumps:
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two boost pumps and two transfer pumps
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Boost pumps:
Location Purpose |
Located in each fuel feed chamber
Serve four purposes: engine starting, backup for the primary jet pumps, fuel pressure for the two transfer jet pumps (in each fuel feed chamber), crossfeed |
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In the automatic mode, the boost pump will operate when:
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fuel feed line pressure drops below 5psi
fuel feed chamber volume falls below full engine starting is selected crossfeed is selected |
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Once automatic boost pump operation is initiated by the low pressure or low fuel volume condition, ___
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it pumps continuously until manually turned off
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Two transfer pumps are used to transfer fuel from ___
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the mid fuselage tanks into the wing tanks.
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What causes the transfer pump to actuate/shutoff?
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electrical signals from a float valve located within the mid tank and a fuel pressure sensor located in the transfer line (5.0+-0.5 psi)
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Do not operate transfer pumps ___
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dry. Pump damage will occur.
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R or L XFER PRESS LO
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Fuel pressure in transfer line below 5.0+-0.5psi (Fuel trans switch in ON)
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There are both primary and transfer jet pumps located ___
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in each fuel feed chamber
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In what orders do fuel tanks fill up?
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Refueling manifold check valve to aft fuselage to aft cabin, mid tanks, wing tanks.
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At what times does the boost pumps come on automatically?
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Engine start, cross feed, fuel feed chamber less than full, less than 5+-.5 psi in the fuel feed line. EFFC (Engine Start,Fuel feed line<5psi+-.5,Feed Chamber Less than full, Crossfeeding)
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What is motive flow?
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An induced high velocity low mass fluid stream.
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How do pilot level control valves work?
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much like a toilet float shuts off incoming water after a certain level is reached
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How does the fuelcross feed work?
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When the appropriate side is selected, fuel is fed from that wing to both engines.
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What are the limitations for cross feeding?
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Limited to level flight when less than 600# remains in the wing tank supplying fuel
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Can you transfer fuel from one tank to another?
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No engines running, Yes engines not running
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What has happened if both boost pumps illuminate (during cross feed)?
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The selected side’s boost pump is not providing enough pressure
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The L or R FUEL LEVEL LO annunciator illuminates when wing fuel tank level drops below ___ gallons or approximately_____ of usable fuel remaining.
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32 gal/200 lbs
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The L or R FUEL FEED annunciator illuminates when low fuel quantity is sensed in the fuel feed chamber (approximately __gallons or __ lbs of usable fuel remaining).
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11 gal/70lbs
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The L or R WNG TNK OV PRESS annunciator illuminates when wing tank pressure reaches _____ psi. This indicates a possible malfunction in the control pilot or level control shutoff valve. If malfunction occurs in a climb, level off and pull back power.
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3.5 +- 0.5 psi.
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The L or R FUEL PRESS LO annunciator illuminates when fuel pressure drops to ____psi in each engine fuel feed line.
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5.0 +- 0.5
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The L or R F XFR PRESS LO annunciator illuminates when fuel pressure in the transfer line falls below____ psi. This may indicate possible fuel transfer pump malfunction/failure.
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5.0 +- 0.5
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The L or R F FLTR BYPASS annunciator illuminates when the fuel filter becomes clogged causing line pressure to exceed____ psi. The bypass valve will open routing unfiltered fuel to the engine
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2.3 +- 0.2
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What does a jet pump light mean?
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Indicates that the motive flow valve is opening or closing
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L FUEL LVL LO
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<200 lbs/32 gal
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XFR PX LO
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<5 +- 0.5psi
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L WG TK OV PX
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3.5 +- 0.5psi
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L FUEL FEED
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<70 lbs/11 gal
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L FUEL PX LO
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5 +- 0.5psi
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Single Point Refuel Takes
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15min
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Px Refuel
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5166 lbs/771 gal
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Gravity Refuel
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4951 lbs/739 gal
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Boost Pump Auto On:
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Engine start
Fuel Px Lo Fuel Feed Lo Crossfeed |