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ON legend will come on to indicate operation.
The legend will remain on until the correct level
of the system to be topped up is achieved.
LO OIL (APU)
The LO OIL legend
comes on to indicate
that the APU is low in
oil quantity and will
remain on until the
APU oil tank is
replenished.
Selecting the switch will illuminate the
VLV OPEN switch legend indicating valve
operation. Oil will be pumped from the
reservoir (through the valve) to the engine
until full is achieved.
The VLV open and LO OIL switch
legends will go out when the correct
level is reached.
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
Operation
The following procedural steps outlined are to be used only as a guide to replenish the APU oil
system. The Airplane Maintenance Manual takes precedence over all servicing procedures.
· Confirm that the “LO OIL” lamp on the oil replenishment panel corresponds to the condition
indicated on EICAS APU OIL LO QTY advisory message.
· Select the switch labeled “APU” on the oil replenishment panel.
· Confirm that the “PUMP ON” (below reservoir label) and “VLV OPEN” (below the APU label)
legends are displayed on the oil replenishment panel.
· Select the “POWER” switch on the oil replenishment panel, “SYSTEM ON” legend on.
· Monitor the oil level on EICAS for both the APU and reservoir (example: if approximately 1
liter or 1 US quart is added to the APU, the oil replenishment tank level should have reduced
by the same amount).
· When the APU reaches its designed level (between 4.5 and 5.5 qts.) confirm that the
“PUMP ON” legend on the oil replenishment panel goes out (indicating pump stoppage).
Also confirm that the “VLV OPEN” legend on the oil replenishment panel goes out (indicating
valve closure).
· Select the “POWER” switch, “SYSTEM ON” legend extinguishes. Record the amount of oil
added and a walk around for external leakage (oil overfill) should be carried out.
AUXILIARY POWER UNIT
Rev 3, Apr 25, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
05−10−7
FUEL CONTROL AND INDICATION
The fuel system is a fully automatic electronic control system. The fuel control unit provides metered
fuel to 10 fuel dual orifice nozzles regulated by signals received from the FADEC.
During start, the fuel system provides the correct amount of fuel to support combustion and for
smooth acceleration of the engine to full rated speed. Once rated speed is reached, fuel flow is
modulated as necessary to meet the demands of varying pneumatic and electrical loads, while
maintaining a constant speed.
Airframe Fuel
Fuel is normally supplied to the APU from the right engine feed line or from the left engine feed
line by opening the crossfeed shutoff valve. The left example below represents APU start
operation with battery electrical power. The right example below represents APU onspeed
operation with AC electrical power. For further information on the airframe fuel system operations,
refer to the FUEL SYSTEM Chapter of this manual.
FGF0510_001
APU starting and no main
engines running:
The right AUX pump supplies
the APU through the right
engine feed line.
APU on−speed and main
The right
PRI pumps feed the APU
through the right engine feed
line.
engines running:
AUXILIARY PUMP
CROSSFEED
SHUTOFF
VALVE
PRIMARY
PUMPS
FUEL
TOTAL FUEL
38400 LBS
FUEL USED
300 LBS
14600 LBS 14600 LBS
9200 LBS
AUX AUX
23 °C 23 °C
P
P
P
APU
32 °C
P
P
32 °C
P P
LO PRESS LO PRESS
P
FUEL
TOTAL FUEL
35616 LBS
FUEL USED
0 LBS
14900 LBS 14900 LBS
5816 LBS
AUX AUX
23 °C 23 °C
P
P
P
APU
32 °C
P
P
P
32 °C
P P
AUXILIARY POWER UNIT
Flight Crew Operating Manual Rev 3, Apr 25, 2005
CSP 700−5000−6
Volume 2
05−10−8
FUEL CONTROL AND INDICATION (CONT'D)
Ignition
The ignition system consists of a dual output ignition unit, two (2) ignition leads and two (2) igniter
plugs. There are two cycles of operation: “BURST” for starting (at 5%) and “MAINTENANCE” for
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