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slat/flap handle position. The RAT can also be manually deployed by pulling RAT
manual deploy handle, located on the center pedestal. Once deployed, the RAT will
power the AC ESS BUS via the ram air turbine line contactor (RATLC).
The RAT also incorporates a hydraulic pump, which powers hydraulic system No. 3.
At approximately 147 KIAS and below, the RAT sheds its electrical output, giving
priority to hydraulics. A ground safety pin is installed in the nosewheel well area to
secure the RAT in position while on ground.
RAT
Manual Deploy
Handle
GX_06_004
GX_06_005
Deployment
Actuator
Retraction
Pump
Uplock
Ram Air
Turbine
Hydraulic Pump
Generator
Ground
Safety
Pin
Downlock
Release
For Training Purposes Only
Sept 04
6-7
P I LOT T R A I N I N G GU I D E
ELECTRICAL
AC SYSTEM DISTRIBUTION
GX_06_006
GEN 1
GEN 2
GEN 3
GEN 4
GTC 9
GTC 8
GTC 10 GTC 2
GTC 12
GTC 11
GTC 7 GTC 1
K2
K3
K4
K6
EPLC APULC
K1 K8
K11
GLC 1 GLC 2
GLC 3
GLC 4
GTC 5 GTC 4
GTC 6 GTC 3
K5 K7
K10
K9
K13
K12
K14
K15
K17
K20
K18
K21
K22
K24
K16
K19
K23
K25
K26
CBA14
CBA20
CBB7
CBA8
CBA2
CBA1
RATLC
K3
ACMP
3B
CABIN
FEEDS
C/B
LOADS
C/B
LOADS
APU BATT
CHGR
APU
BATT
HTR
SSPC
LOADS
SSPC
LOADS
SSPC
LOADS
SSPC
CABIN LOADS
FEEDS
CABIN
FEEDS
CABIN
ACMP FEEDS
2B
C/B
LOADS
C/B
ACMP LOADS
1B
ACMP
3A
AC BUS 1
AC BUS 1A
AC BUS 2
AC BUS 2A
AC BUS 3
AC BUS 3A
AC BUS 4
CCBP
ACPC
GEN 1 GEN 2 GEN 3 GEN 4
EXT
AC
APU
GEN
ENG 1 ENG 2
RAT
GEN
EXT AC
APU GEN
RAT GEN
AC ESS BUS
6-8 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
ELECTRICAL
ELECTRICAL PANEL
The generators and external power can be controlled manually, by selecting the
appropriate switch on the electrical panel, located on the overhead panel. GEN 1, 2, 3,
4 and APU GEN switches are normally ON.
NOTE
If RAT GEN is powering AC ESS BUS, and a main generator is
available, stow the RAT deploy handle and select RAT GEN to
OFF, to transfer AC ESS BUS to the main generator. The RAT
GEN will remain armed to ensure RAT GEN priority in the event
of loss of all main generators.
ELECTRICAL
EXT AC
AVAIL
ON
FAIL
OFF
GEN 1
FAIL
OFF
EXT DC
AVAIL
ON
GEN 3 GEN 4
FAIL
OFF
GEN 2
FAIL
OFF
PUSH OFF/RESET
PUSH
OFF/RESET
APU GEN
FAIL
OFF
RAT GEN
ON
OFF
BATT MASTER
EMS
OFF
ON
ASTE
E
OF
External AC Switch
AVAIL Light
ON Light
Displays status of AC external power
• - Comes on to indicate that
external AC power is connected and is the
correct phase, voltage and frequency.
• - Indicates that external power
is being used or can be used by the
airplane power distribution system to
maintain power to the AC buses.
GEN 1, 2, 3, 4 Switches
FAIL Light
OFF Light
Used to reset or to turn
applicable generator off.
• - Indicates a failed
generating channel (GEN, GCU,
GLC) / FAIL Light illuminates
when fire discharge handle is
pulled.
• - Indicates
generator operation inhibited.
RAT GEN Switch
ON Light
OFF Light
Used to reset a fault or to turn RAT
generator off.
• - Indicates that RAT
generator is on line.
• - Indicates that RAT
generator operation is inhibited.
APU GEN Switch
FAIL Light
OFF Light
Used to reset or to turn APU generator off.
• - Indicates a failed generating channel.
• - Indicates generator operation
inhibited.
GX_06_007
For Training Purposes Only
Sept 04
6-9
P I LOT T R A I N I N G GU I D E
ELECTRICAL
ELECTRICAL MANAGEMENT SYSTEM
Load control consists of smart contactors, Solid State Power Controllers (SSPC) and
control logic. Smart contactors and SSPC are functionally similar to a switch in series
with a circuit breaker. The status of all circuit breakers is monitored (trips are
　
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