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Ram Air Turbine (RAT) extends automatically.
In addition, the CSM/G Control Unit activates the CSM/G
solenoid valve using battery 2 and the generator starts
running.
After relay 22XE time delay, RAT solenoid 1 is
de-energized and the Constant Speed Motor/Generator
solenoid valve is supplied by the Permanent Magnet
Generator (PMG).
TMUELAR02-T01 LEVEL 3
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AC GENERATION - RAM AIR TURBINE ACTIVATION - AUTOMATIC ACTIVATION
TMUELAR02-P01 LEVEL 3
EFFECTIVITY 24-24-00 Page 3
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AC GENERATION - RAM AIR TURBINE ACTIVATION
MANUAL ACTIVATION
When the MAN ON pushbutton is pressed, RAT solenoid 2
is energized by battery 2 and the RAT extends.
In addition, the CSM/G Control Unit activates the CSM/G
solenoid valve using battery 2 and the generator starts
running.
When the MAN ON pushbutton is released out, RAT
solenoid 2 is de-energized.
The CSM/G solenoid valve is supplied by the PMG.
NOTE: the RAT manual activation function is only used
in case of CSM/G automatic control logic failure.
TMUELAR02-T02 LEVEL 3
EFFECTIVITY 24-24-00 Page 4
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AC GENERATION - RAM AIR TURBINE ACTIVATION - MANUAL ACTIVATION
TMUELAR02-P02 LEVEL 3
EFFECTIVITY 24-24-00 Page 5
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AC GENERATION - RAM AIR TURBINE ACTIVATION
MANUAL ACTIVATION FROM HYDRAULIC PANEL
The RAT MAN ON pushbutton on the Blue Hydraulic Panel
enables the activation of the RAT for hydraulic power
supply only.
Solenoid 1 is then supplied by HOT BAT BUS 1.
TMUELAR02-T03 LEVEL 3
EFFECTIVITY 24-24-00 Page 6
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AC GENERATION - RAM AIR TURBINE ACTIVATION - MANUAL ACTIVATION FROM HYDRAULIC PANEL
TMUELAR02-P03 LEVEL 3
EFFECTIVITY 24-24-00 Page 7
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SELF EXAMINATION
How is the RAT extension system controlled?
A - By means of two solenoids energized at
the same time.
B - By means of two solenoids.
C - By means of one solenoid only.
What are the RAT solenoids supplied by?
A - Battery or Hot Bat Bus.
B - DC Bat Bus.
C - DC Bus 1 or 2.
TMUELAR02 LEVEL 3
EFFECTIVITY 24-24-00 Page 8
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24 - ELECTRICAL POWER
24-24-00 AC GENERATION - CONSTANT SPEED
MOTOR/GENERATOR CONTROL UNIT D/O
CONTENTS:
Generator Control
Speed Regulation
Voltage Regulation
Generator Monitoring
BITE
Self Examination
TMUELAT02 LEVEL 3
EFFECTIVITY 24-24-00 Page 1
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AC GENERATION - CONSTANT SPEED MOTOR/GENERATOR CONTROL UNIT D/O
CONSTANT SPEED MOTOR
The automatic control logic being set, the Generator
Control Unit (GCU) internal 28VDC bus is supplied by
battery 2 through relay K3.
Relay K1 is then energized, allowing the solenoid
control valve to be supplied by the internal bus (still
on BAT2). Relay K3 is held closed by the GCU internal
supply via relay K2 and the time delay opening
transistor.
When the emergency generator parameters are correct
(voltage and frequency above UV and UF threshold) or
after 10 seconds (CSM/G start phase), relay K2 closes.
The Generator Line Contactor (GLC) closes and relay
K3 is de-energized, allowing the Solenoid Control Valve
power supply change over from battery 2 to the
Permanent Magnet Generator(PMG).
The CSM/G can also be started manually via the MAN ON
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