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Motive
Flow
Line
Note: Left motive 1 flow line can be fed by L Eng fuel boost pump, R Eng fuel boost pump, L Eng driven pump
1
AUXILIARY POWER UNIT
For Training Purposes Only
Sept 04
5-17
P I LOT T R A I N I N G GU I D E
Controls and Indicators
The APU control panel and the EICAS status page provide the APU controls and
indicators.
The APU control panel has two switch/lights:
• PWR FUEL supplies power to APU fuel pump
• START/STOP to activate the ECU and to start and stop the APU
APU monitoring is provided by two gauges (RPM and EGT) on the EICAS status
page. These indicators are activated when the PWR FUEL switch/light is pressed in
and are removed from the display 60 seconds after selecting the PWR FUEL switch/
light off.
The APU fault panel supplements the EICAS for APU fault indications.
APU Control Panel and EICAS Indications
Figure 5-8
APU
START/ STOP
START
AVAIL
PWR FUEL
PUMP
FAIL
SOV
CLOSED
PWR/FUEL Switch/Light
Push in
Push out
PUMP FAIL Light
Illuminated
SOV CLOSED Light
Illuminated
– Supplies electrical power to
APU fuel pump, opens APU fuel SOV
and negative- illuminates
APU RPM and EGT indicators on EICAS
status page
– Shuts power to APU fuel
pump, APU fuel SOV, negative-G SOV
and ECU
– Indicates low APU fuel
pump pressure with the switch pushed in.
– Indicates APU fuel SOV
and APU negative-G SOV are both
closed with the APU fire/push switch
activated
G SOV. This
START/STOP Switch/Light
Push in
Push out
START Light
Illuminated
AVAIL Light
Illuminated
– Activates ECU,
initiates start sequence of
the APU
– Stops the APU
– Indicates that
the starter is engaged
– Indicates APU
is ready for supplying
electrical and bleed air loads
APU CONTROL PANEL
APU
62 481
RPM EGT
EICAS STATUS PAGE
P604_05_003
AUXILIARY POWER UNIT
5-18 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
APU Fault Indication Panel
Figure 5-9
OVER
SPEED
OVER
CURRENT
EGT
HIGH
PRESS LOW TEMP HIGH
PRESS LOW TEMP HIGH
RESET TEST APU STOP
APU FAULT
OIL
IND BOARD
GEN ADAPTER OIL
IND BOARD
TEST OK
OVER
SPEED
OVER
CURRENT
EGT
HIGH
PRESS. LOW TEMP. HIGH
PRESS. LOW TEMP. HIGH
IND. RESET APU STOP
APU FAULT
OIL
GEN. ADAPTER OIL
P604_05_005
A
E
G
C
H
B
F
D
I
APU EGT HIGH
Indicates APU exhaust gas temperature
exceeded limits. APU shuts down
automatically, followed by EICAS message
of APU OVERTEMP (red) and voice
APU OIL TEMP HIGH message calling out "APU".
Indicates APU high oil temperature. APU
shuts down automatically, followed by
EICAS message of APU OIL TEMP (amber).
GEN ADAPTOR OIL TEMP HIGH
Indicates generator adapter high oil
temperature. APU shuts down automatically,
followed by EICAS message of APU
OIL TEMP (amber).
APU OVER SPEED
Indicates APU overspeed. APU shuts down
automatically, followed by EICAS message
of APU OVERSPEED (red) and voice
message calling out "APU".
APU OIL PRESS LOW
Indicates APU low oil pressure. APU shuts
down automatically, followed by EICAS
message of APU OIL PRESS (amber).
GEN ADAPTOR OIL PRESS LOW
Indicates generator adapter low oil
pressure. APU shuts down automatically,
followed by EICAS message of APU
OIL PRESS (amber).
A
APU STOP Pushbutton
When pressed, stops APU at any time.
IND RESET Pushbutton
When pressed, fault flags are reset by
rotating them out of view or extinguishing
red LED. If condition has not been corrected,
flags stay in view.
OVER CURRENT
Indicates overcurrent at one or more of
the circuits downstream of the ECU-APU
shuts down automatically (no EICAS
message).
TEST Switch
Allows testing the circuitry and the LEDs.
TEST Led
Illuminates green if test is OK.
G
H
I
J
K
B
C
D
E
F
APU FAULT Panel
(Aft L/H Rear Fuselage)
EFFECTIVITY: 5452 – 5990 and Sub
H
E
A
C
G
I
F
D
K
B
J
AUXILIARY POWER UNIT
For Training Purposes Only
　
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