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EMS CDU on the ground only.
RAT TEST:
Press the RAT TEST activation button
to initiate test. Test duration is
approximately 5 seconds.
GF0710_052
TEST CONTROL 2/2
RAT TEST OFF
The pilot activated test checks the following:
· The RAT line contactor,
· the 147 KEAS discrete signal from the MADCs
· the RAT GCU,
· the RAT deploy handle status signal,
· AC bus 4 status signal,
· the RAT GEN push button annunciator status,
· the RAT generator heater.
A failed test results in a RAT GEN FAIL caution message being posted on the EICAS status page.
ELECTRICAL
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
07−10−41
EMERGENCY DC POWER
In the event of loss of all AC power , or the airplane speed is 147 knots or less with the RAT
deployed, a “BATTERY EMER PWR ON” EICAS message will be displayed.
If the RAT is deployed and speed is less than 147 knots, it will automatically shed its electrical output
giving priority to hydraulics.
NOTE
Battery emergency power is available for a minimum of 15 minutes.
GF0710_053
AC BUS 1
V
KVA
GEN
1
GEN
2
AC BUS 2
V
KVA
GEN
3
AC BUS 3
V
KVA
V
KVA
GEN
4
AC BUS 4
AC ESS BUS
GEN
V
KVA
0
0
0 HZ
APU
AC ELECTRICAL
0
0
0
0
0
0
0
0
0
0
V
HZ
BATTERY EMER PWR ON
AC BUS 2
FEEDER
DC BUS 1
AC BUS 3
FEEDER
DC BUS 2
TRU 2
AC BUS 1
FEEDER
AC ESS
BUS
V
A
0
0
ESS
TRU 1
DC EMER
BUS
V
A
26
24
−10°C
AV
BATT
V
A
24
24
20 °C
APU
BATT
DC ELECTRICAL
V
A
0
0
ESS
TRU 2
V
A
0
0
TRU 1
V
A
0
0
BATT BUS
APU BATT
DIR BUS
AV BATT
DIR BUS
DC ESS
BUS
180
170
160
150
140
130
120
110
147
8
6
RAT GEN
ELECTRICAL
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
07−10−42
DC POWER EMERGENCY OVERRIDE
In the event of loss of all DC power control (black cockpit), selecting the DC POWER EMERGENCY
OVERRIDE switch (located on the pedestal), to OVERRIDE, will enable ESS TRU 1 and ESS TRU 2
to power the BATT BUS and DC ESS BUS SPDAs.
ELECT DC PWR EMER OVRD
Switch
Used to enable ESS TRU 1 and ESS
TRU 2 to power the BATT BUS and
DC ESS BUS SPDAs, in the event of
loss of all DC power control.
BUS SPDAs are powered by the
essential TRUs.
BUS are powering their respective
SPDAs.
GF0710_054
OVRD − BATT BUS and DC ESS
NORM − BATT BUS and DC ESS
ELECTRICAL
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
07−10−43
DC POWER EMERGENCY OVERRIDE (CONT'D)
Expected results when loss of DC
power control occurs. Results
may vary depending on degree of
failure.
NOTE
Expected flow lines while
performing the DC Override Test.
GF0710_055 AC BUS 2
FEEDER
DC BUS 1
AC BUS 3
FEEDER
DC BUS 2
TRU 2
AC BUS 1
FEEDER
AC ESS
BUS
V
A
0
0
ESS
TRU 1
DC EMER
BUS
V
A
26
24
−10°C
AV
BATT
V
A
24
24
20 °C
APU
BATT
DC ELECTRICAL
V
A
0
0
ESS
TRU 2
V
A
0
0
TRU 1
V
A
0
0
BATT BUS
APU BATT
DIR BUS
AV BATT
DIR BUS
DC ESS
BUS
AC BUS 2
FEEDER
DC BUS 1
V
A
28
35
TRU 1
AC BUS 3
FEEDER
AC BUS 1
FEEDER
AC ESS
BUS
V
A
0
0
ESS
TRU 2
DC BUS 2
AV BATT
DIR BUS
V
A
26
0
−10°C
AV
BATT
V
A
24
0
APU BATT
DIR BUS
20 °C
APU
BATT
DC EMER
BUS
V
A
28
0
TRU 2
BATT BUS
DC ESS
BUS
　
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