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appears on the LCV switch/light.
Surge Control Valve
To prevent compressor surge during high altitude shaft operation in flight, unused bleed air is
vented through the SCV into the APU tailpipe. SCV operation is automatically controlled by
internal logic within the ECU. The valve’s open/closed schedule is based on pressure altitude
and APU inlet temperature. The surge control valve is only required during in-flight APU
operation, at altitudes above 15,000 feet.
AUXILIARY POWER UNIT
Description APU 150
Vol. 2 05−15−20
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
PNEUMATIC SUPPLY (CONT'D)
Bleed Air Indication
APU bleed air indication is displayed on the EICAS status page below the APU gauges.
APU Pneumatic Supply
Figure 05−15−11
AUXILIARY POWER UNIT
Description APU 150
Vol. 2 05−15−21
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
CONTROLS AND INDICATORS
The APU panel provides the control for the APU operation, and the EICAS provides a visual display
of APU indications. The APU fault panel supplements the EICAS for specific APU faults.
The APU panel has two switch/lights:
• PWR FUEL; Activates the ECU, which commands fuel valves and pump operation.
• START/STOP; Commands APU start and shutdown modes of operation.
APU monitoring is provided by two gauges (RPM and EGT) on the EICAS status page. The APU
indications are activated when the PWR FUEL switch/light is pressed in, and are removed
60 seconds after selecting the PWR FUEL switch/light out.
APU Panel and EICAS Indications
Figure 05−15−12
AUXILIARY POWER UNIT
Description APU 150
Vol. 2 05−15−22
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
CONTROLS AND INDICATORS (CONT'D)
EICAS and Synoptic Page Color Coding
Figure 05−15−13
AUXILIARY POWER UNIT
Description APU 150
Vol. 2 05−15−23
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
EICAS MESSAGES
MESSAGE MEANING
AURAL WARNING
(IF ANY)
APU FIRE Fire detected in the APU enclosure. FIRE BELL
APU OVERSPEED APU has shut down due to an overspeed condition. “APU”
APU OVERTEMP APU has shut down due to an overtemperature
condition.
“APU”
APU LCV FAIL APU load control valve has failed in the open position with APU LCV interlock
activated.
APU SOV
APU fuel shutoff valve is open with the APU FIRE PUSH switch activated, or
the fuel shutoff valve position does not match the APU PWR FUEL switch
position, within 5 seconds.
APU NEG-G SOV
APU negative-G shutoff valve is open with the APU FIRE PUSH switch
activated, or the negative-G shutoff valve position does not match the APU
PWR FUEL switch position, within 5 seconds.
APU OIL PRESS APU oil pressure or APU adapter oil pressure is low and the APU will shut
down.
APU OIL TEMP APU oil temperature or APU adapter oil temperature exceeds limits and the
APU will shut down.
APU PUMP APU fuel pump has failed. PWR FUEL switch/light pressed in and the APU
pump low pressure.
APU SOV CLSD APU fuel shutoff and negative-G shutoff valves have closed after actuation of
the APU FIRE PUSH switch/light.
AUXILIARY POWER UNIT
Description APU 150
Vol. 2 05−15−24
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
POWER SUPPLY AND CIRCUIT BREAKER SUMMARY
SYSTEM SUB-SYSTEM CB NAME BUS BAR
CB
PANEL
CB LOCATION NOTES
Auxiliary Power
Unit
APU Electronic
Control Unit
APU ECU PRIM BATT BUS
5
A2 POST SB
604–49–006
or
604–49–009
APU ECU SEC
DC MAIN
BATT
DIRECT
A3
APU ECU
DC BATT 1
L1
APU Fault
Annunciation
APU FAULT ANN L2
APU Start APU START CONT L3
AUXILIARY POWER UNIT
Summary
Vol. 2 05−20−1
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
AUXILIARY POWER UNIT
Summary
Vol. 2 05−20−2
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
THIS PAGE INTENTIONALLY LEFT BLANK
DESCRIPTION
General 06−10−1
Audio Integrating System 06−10−1
Description 06−10−1
Components and Operation 06−10−1
Controls and Indicators 06−10−2
VHF Communication System 06−10−4
Description 06−10−4
　
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