AIRPLANE
OPERATIONS
MANUAL
NORMAL PROCEDURES
REVISION 37
1-02-13
Page
5
Code
01
AOM-145/1114
APU START WITH GPU
Internal Safety Inspection ............................................. COMPLETED
Batteries 1 & 2 .............................................................. AUTO
Immediately after the batteries are switched ON the aural message
“AURAL UNIT OK” can be heard.
Avionics Master 1 or 2 .................................................. ON
Batteries Voltage.......................................................... CHECKED
Check battery voltage on MFD.
If battery voltage is below 19 V it must be replaced. If battery
voltage is below 24 V report to the maintenance personnel or
recharge the affected battery by using the APU generator. In case
of recharging, it is recommended that battery 1 be turned OFF
before GPU disconnection. After GPU disconnection wait 3 minutes
then select battery 1 to AUTO.
While GPU is ON, batteries will not be recharged.
The minimum time for battery recharging is 30 minutes.
For cold soak operation, refer to Operation In Icing Conditions
section.
GPU Voltage................................................................. CHECKED
Check the ELEC page on the MFD if voltage is within 28.0 V
(-2.0 V +1.0 V).
Avionics Master 1 & 2................................................... OFF
Once the GPU voltage is checked, Avionics Master bars 1 & 2 must
be switched OFF.
GPU .............................................................................. ON
When the GPU switch is selected, the “GPU AVAIL” message on it
goes off and its yellow stripe lights up.
PUMP PWR.................................................................. ON
Switch on one of the TANK 2 electric fuel pumps. However, if
TANK 1 has more fuel than TANK 2, use XFEED and switch one of
the TANK 1 pumps instead.
Fire Detection............................................................... CHECKED
Press and hold (for at least 2 seconds) the Fire Detection Test
button while observing the following:
EICAS messages:
Warning: APU FIRE, ENG 1 (2) FIRE, BAGG SMOKE
Caution: APU FIREDET FAIL, E1 (2) FIREDET FAIL
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