Ice and Rain Protection
Citation Bravo
Developed for Training Purposes
5H-7
March 2009
Engine
Anti-Ice
System
If ice builds up on the engine, using
engine anti-ice can cause ice inges-
tion. If ice build-up occurs, climb or
descend into a clear area. If unable
to climb or descend, consider turn-
ing on one system at a time; this pre-
cludes dual engine flameout caused
by ingested ice.
With the system operating, bleed air
travels through the duct and exits
from the air inlet assembly forward
of the engine inlet adapter.
The normally open (electrically
closed) solenoid valves control the
airflow into the air inlet lip and
engine stator. Electrical power holds
the valves closed until anti-ice is
selected; the valves open only with
the removal of power and at least 8
PSIG bleed air pressure available.
The valves regulate bleed air from
14 to 18 PSIG for anti-ice protec-
tion.
ENGINE ANTI-ICE
Switches
The L and R ENGINE ANTI-ICE
switches on the pilot's lower left
instrument panel electrically control
the engine anti-ice systems
(Figure
5H-4)
.
With the switch in OFF, the
engine bleed valves receive power to
keep them closed.
Turning the switch to ON removes
electrical power from the bleed air
solenoid valves and they open.
With a throttle setting below 60%
N
2
, power is supplied continuously
to the inlet lip and stator valves to
keep them closed. With power above
60% N
2
, electrical power routes
through a thermal time delay relay
and then to the valves. After five
seconds, the thermal relay opens to
remove power from the valves, so
they open.
The five-second time delay allows
the engines to accelerate quickly
during a go-around situation without
robbing power from the engines for
anti-ice.
When the aircraft is in flight with the
landing gear selected UP and the
Engine Anti-Ice switches ON, High
Idle/Flight Idle is automatically reset
to 60% N
2
in order to maintain ade-
quate bleed air temperature to the
engine inlet and stator. If the Anti-
Ice switch remains ON when the
landing gear is selected DOWN,
engine idle will automatically reset
to the normal minimum High Idle/
Flight Idle speed of approximately
50% N
2
. With the Engine Anti-Ice
switches selected OFF, the engines
will reset to the normal High Idle/
Flight Idle speed regardless of the
landing gear position.
During normal cruise operation with
power set above 60% N
2
for longer
than five seconds, activation of the
ENGINE ANTI-ICE switches de-
energizes the solenoid valves imme-
diately. Reducing power below 60%
N
2
causes the solenoid valves to
close; this resets the thermal time
delay relay.
Electrical power is also provided to
five heating elements in each
inboard wing;
A rise in ITT indicates that the anti-ice
valves are open, causing a decrease in
airflow through the engine.
NOTE:
Visible moisture includes,
but is not limited to, the following
conditions: fog with visibility less
than one mile, wet snow and rain
5H-4
Summary of Contents for Citation Bravo
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