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POWER PLANT
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
18−10−8
ENGINE OIL SYSTEM (CONT'D)
Oil Replenishment Schematic
GF1810_015
O
OIL REPLENISHMENT
POWER
RESERVOIR LH ENG APU RH ENG
SYSTEM
ON
TANK
LO
PUMP
ON
LO
OIL
VLV
OPEN
LO
OIL
VLV
OPEN
LO
OIL
VLV
OPEN
AIRFRAMEMOUNTED
AIRFRAMEMOUNTED
Operation
The following procedural steps outlined are to be used only as a guide to replenish the engine oil
system. The Airplane Maintenance Manual takes precedence over all servicing procedures.
· Select the “POWER” switch on the oil replenishment panel, “SYSTEM ON” legend on.
· Confirm that the “LO OIL” lamp on the oil replenishment panel corresponds to the condition
indicated on EICAS “L (R) OIL LO QTY” caution message (if message present).
· Select the switch labeled “LH or RH ENG” on the oil replenishment panel.
· Confirm that the “PUMP ON” (below reservoir label) and “VLV OPEN” (below the engine to
be filled) legends are displayed on the oil replenishment panel.
· Monitor the oil level on EICAS for both the engine and reservoir (example: if approximately 1
US quart is added to the engine, the oil replenishment tank level should have reduced by the
same amount).
· When the engine reaches maximum level confirm that the “PUMP ON” legend on the oil
replenishment panel goes out (indicating pump stops). Also confirm that the “VLV OPEN”
legend on the oil replenishment panel goes out (indicating valve closed).
· It is recommended to manually stop replenishment when the gauge reads 11.0 quarts to
avoidoverservicing.
POWER PLANT
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
18−10−9
ENGINE FUEL SYSTEM
The fuel system provides engine fuel for combustion, HP compressor Variable Stator Vanes (VSV)
actuation and engine oil cooling.
The main components that are contained in the fuel system are as follows:
· Fuel Pump Unit − The fuel pump unit contains both the LP and HP pumps. Fuel supplied from
the airplane fuel system passes through the (centrifugal type) LP pump, is pressurized and is
delivered to the Fuel Cooled Oil Cooler (FCOC).
· LP Filter − Fuel from the FCOC enters the LP fuel filter, where any debris is trapped before
proceeding on to the HP pump. The fuel filter contains a combined DP switch /indicator. The
combined unit provides indications on EICAS of low pressure fuel or an impending LP fuel filter
blockage. A FUEL FILTER (single) or L−R FUEL FILTER (both) message is displayed on
EICAS. If a fuel low pressure switch is also provide to alert the crew of low fuel pressure in the
supply line to the HP pump. A FUEL LO PRESS message will be displayed on EICAS.
· HP Fuel Pump − The HP fuel pump increase the pressure of the fuel for delivery to the Fuel
Metering Unit (FMU).
· The FMU meters the fuel required by the engine in response to the Electronic Engine
Controller (EEC) and provides pressure which is used as a motive force for the VSVs. The
variable inlet guide vanes and the first three stages of stators of the HP compressor adjust the
airflow entering the compressor to assist during engine starts, help prevent compressor surges
and maintain best specific fuel consumption. The FMU also prevents fuel flowing to the fuel
spray nozzles in the event of an engine overspeed and drains the fuel manifold into the drains
tank on engine shut down. The desired fuel flow is maintained by controlling the position of the
fuel metering valve. A constant pressure drop is maintained across the fuel metering valve by
the spill valve, which diverts unused fuel back to the fuel pump. The spill diverter valve allows
spill return fuel to the FCOC at low engine speeds to prevent fuel from recirculating around the
HP pump, which could cause excessive fuel temperatures. The high pressure shutoff valve
(HPSOV) allows the fuel to enter the HP fuel filter and is controlled by the FMU and the engine
run switches.
· Fuel Flow Transmitter − Provides an indication of fuel flow to the EEC and to EICAS.
5750 FF (PPH) 5750 NOTE: Can be FFd (PPiH)splayed in Pounds/Hour (PPH) or Kilograms/Hour (KPH).
· HP Filter − Prevents debris from entering the fuel manifold and causing possible blockage of
the fuel spray nozzles.
· Fuel Temperature Transducers − Fuel enters the fuel filter and passes over the temperature
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