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seconds and will be replaced by a cyan “APU SUTDOWN“ advisory.
A low oil pressure condition in flight will not cause an APU protective shut down.
Gravity Oil Fill
The APU oil sump can be filled through the gravity fill cap. The oil reservoir for the APU is an
integral part of the accessory gearbox assembly and has a capacity of 5.25 quarts, with the add
level at 3.75 quarts. The gravity fill is designed for a “fill to spill” ease of servicing and used only
when the oil replenishment system does not function.
OIL REPLENISHMENT SYSTEM
The oil replenishment tank volume contains 5.7 liters (6 US quarts). APU oil level is measured via a
sensor located in the APU oil tank which provides quantity information for the EICAS STAT page.
Electrical failure of this sensor will be detected during the builtintest
and the quantity indicating
value will change from a numerical value to amber dashes on EICAS. An APU OIL LO QTY advisory
message will occur on EICAS (on ground only), when the APU oil level reaches approximately 3.5
US quarts and the APU has not been operating for 15 minutes.
AUXILIARY POWER UNIT
Flight Crew Operating Manual Rev 3, Apr 25, 2005
CSP 700−5000−6
Volume 2
05−10−4
OIL REPLENISHMENT SYSTEM (CONT'D)
An oil replenishment tank is located in the aft equipment bay and contains an electrical pump and
sensor probe for quantity level. The oil replenishment (pressure filling) system is designed for ground
use only and serves both main engines and APU. A three way electrical valve is incorporated in the
replenishment system to allow transfer of oil to the system being topped up (either engine or APU).
APU/ENGINE OIL
REPLENISHMENT TANK
APU OIL TANK
APU OIL QUANTITY
Indicates APU oil tank
quantity in quarts.
NOTE
are removed when the airplane is not on
ground or APU is operating greater than
90% displayed RPM.
GF0510_004
The "APU" label and digital readout
CKPT (°C) FWD
CABIN (°C)
AFT
CABIN (°C)
20
90
22
20
22
20
1300
0.00
000
OXYGEN 000
CAB ALT
P
CAB RATE
LDG ELEV
19
%
OIL QTY (QTS)
ENG
APU
RES
10.4
4.5
5.0
10.4
APU
RPM 100 EGT 650
BRAKE TEMP
03 03 03 03
The oil quantity digital readout will turn amber when the APU OIL LO QTY message is displayed.
AUXILIARY POWER UNIT
Rev 3, Apr 25, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
05−10−5
OIL REPLENISHMENT SYSTEM (CONT'D)
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 failures
maintenance instructions must be followed according to the Airplane
Maintenance Manual.
The oil filling system is operated through the oil replenishment panel located on bulkhead 280 (left
side behind the pilot’s seat) in the flight compartment.
NOTE
1. A reservoir TANK LO light remaining on three seconds following
panel powerup
indicates that the reservoir 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 the 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 is not already full.
· Both engines are not running and one of the other engines is not currently being
replenished.
AUXILIARY POWER UNIT
Flight Crew Operating Manual Rev 3, Apr 25, 2005
CSP 700−5000−6
Volume 2
05−10−6
OIL REPLENISHMENT PANEL
GF0510_005a
SYSTEM ON
Selecting the POWER switch does the
following:
The SYSTEM ON legend illuminates.
A three second lamp test will be carried out
on all annunciators.
TANK LO
The reservoir TANK LO legend
comes on to indicate that the
reservoir is low in quantity.
VLV OPEN (APU)
PUMP ON
Selecting the PUMP ON switch does the
following:
The reservoir pump will operate and the PUMP
　
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