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CKPT (C) FWD
CABIN (C)
AFT
CABIN (C)
OXYGEN
CAB RATE
LDG ELEV
P
1300
20
19
22
20
22
20
0.00
0
1000
CAB ALT
For Training Purposes Only
Sept 04
4-7
P I LOT T R A I N I N G GU I D E
AUXILIARY POWER UNIT
OIL REPLENISHMENT SYSTEM FILLING
The system can be operated using the battery or external electrical power. Oil level
monitoring is required during servicing to verify that the system stops automatically
when the full level is reached.
NOTE
To protect against overfilling due to system component failure,
maintenance instructions must be followed according to the
Airplane Maintenance Manual.
The oil filling system is operated through the oil replenishment panel located behind
the pilot’s seat in the flight compartment.
NOTE
1) A replenishment reservoir TANK LO light remaining on
following panel power-up indicates that the oil replenishment
tank is low. Under this condition refilling is inhibited until the
reservoir is filled.
2) If a low oil replenishment condition occurs during a fill the
system will shut down.
Oil is to be added to the APU when APU OIL LO QTY advisory message is on
EICAS and the LO OIL for APU display is shown on the oil replenishment panel.
The switch legends on the oil replenishment panel can only be displayed when the
SYSTEM ON switch is selected.
The APU may be replenished if:
• The APU has been shut down for a minimum of 15 minutes
• The APU oil reservoir is not already full
• Both engines are shut down and are not currently being replenished
4-8 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
AUXILIARY POWER UNIT
OIL REPLENISHMENT PANEL
OPERATION
The following procedure is to be used only as a guide to replenish the APU oil system.
The Airplane Maintenance Manual takes precedence over all servicing procedures.
• Select the POWER switch (SYSTEM ON) on the oil replenishment panel
• Confirm that the LO OIL lamp (APU) on the replenishment panel corresponds to
the condition indicated on EICAS i.e. APU OIL LO QTY advisory message and
quantity in amber on STAT page
• Select the switch labeled APU on the replenishment panel
• Confirm that the PUMP ON (below RESERVOIR label) and VLV OPEN (below
the APU label) legends are displayed
• Monitor the oil level on EICAS for both the APU and reservoir (example: if
approximately one US quart is added to the APU, the oil replenishment tank level
should have reduced by the same amount)
• When the APU oil tank is full, confirm that the PUMP ON legend goes out
(indicating pump stoppage). Also confirm that the VLV OPEN legend goes out
(indicating valve closure)
• Select the POWER switch, SYSTEM ON legend extinguishes. Record the amount
of oil added and a carry-out a walk around for external leakage (oil overfill)
OIL REPLENISHMENT
RESERVOIR
TANK
LO
PUMP
ON
LH ENG APU RH ENG
POWER
SYSTEM
ON
LO
OIL
LO
OIL
LO
OIL
VLV
OPEN
VLV
OPEN
VLV
OPEN
PUMP ON
• The reservoir pump PUMP ON lamp will
come on to indicate operation. The legend
will remain on until the correct level of the
system to be topped up is achieved.
SYSTEM ON
Selecting the SYSTEM ON switch does the
Following:
• The SYSTEM ON lamp will come on.
• A three second lamp test will be carried
out on all annunciators.
VLV OPEN (APU)
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.
LO OIL (APU)
The LO OIL comes on to indicate that the
APU is low in quantity and will remain
on until the APU oil tank is replenished.
TANK LO
The reservoir TANK
LO legend comes
on to indicate that
the reservoir is low
in quantity.
GX_04_004
For Training Purposes Only
Sept 04
4-9
P I LOT T R A I N I N G GU I D E
AUXILIARY POWER UNIT
GRAVITY OIL FILL
The APU oil sump can be filled through the gravity filler. The oil reservoir for the
APU is an integral part of the accessory gearbox assembly and has a capacity of 5.25
US quarts. It is recommended to top up the reservoir when the STAT page indication
shows 4.5 quarts. The gravity fill is designed for a “fill to spill” ease of servicing, and
　
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