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of 25–200 psi. The pressure relief setting
of the valve is 27 psig. If the service air regulator
regulates too low, the failure is detected
by the deice system monitors. If the service air
regulator regulates too high, the pressure supplied
to the boots is limited to 27 psig by the relief
port of the valve.
Surface Deice Boots
The wing, horizontal stabilizer, and vertical
tail are deiced by pneumatic boots controlled
by the WING/STAB switch. The wing boots
are separated into two independent pneumatic
chambers: one for the upper surface and one
for the lower surface. Each stabilizer boot has
one pneumatic chamber. All boots have spanwise
tube configurations.
Surface Deice Control Valves
The wing and stabilizer EFCVs are electrically
controlled switching valves. When the deice
system is turned off or not being inflated, vacuum
is applied to the boots by the EFCVs. This
is done by passing the supplied service air over
a venturi in the valve and is then vented overboard.
The other end of the venturi is connected
to the boot and the flow created in the venturi
creates the vacuum at the boot. When an inflation
is triggered, a solenoid closes the EFCV vent
and the service air then routes through the venturi
to inflate the boot.
CITATION MUSTANG OPERATING MANUAL
10-6 510OM-00
Surface Deice Pressure
Switches
The boot pressure switches are immediately
between the EFCV and their boots. There are
four switches for the wing (two per side) and
two switches for the vertical and horizontal stabilizers.
The switches are set to close at 16 psig
and open when the pressure decreases to below
10 psig. They provide information controlling
the CAS messages for this system.
CONTROLS AND INDICATIONS
WING/STAB Switch
The control switch for the surface deice system
is on the pilot side of the instrument panel
with the other ICE PROTECTION controls
(see Figure 10-2). The WING/STAB switch has
three positions: OFF, AUTO and MANUAL.
In the OFF position, no power is supplied to the
EFCVs and service air flows through the valves
to create a vacuum that holds the boots deflated.
The AUTO position activates the deice control
and monitor boards which run the 2-minute
boot cycle.
The MANUAL position is spring-loaded and
is active only while held in that position. When
the switch is in the MANUAL position, power
is supplied to the EFCVs to apply pressure to
the boots. It also supplies a signal to the deice
monitor board to check for adequate pressure
supplied to the boots.
System Monitoring and
Indications
Deice boot inflation is monitored by a series
of pressure switches. One switch is provided
for each deice boot chamber. The right ice
protection system PCB monitors the pressure
switches to verify the deice boots inflate when
commanded by the left ice protection system
PCB. If the deice boots fail to inflate, a discrete
output is provided to the CAS to announce
the failure.
SURFACE DE-ICE Message
In AUTO mode, a white SURFACE DE-ICE
CAS message indicates when all pressure
switches for the inflation sequence (lower
wing/left tail or upper wing/right and vertical
tail) are indicating deice boot inflation. In MANUAL
mode, the white message displays only if
all pressure switches indicate deice boot inflation.
The pilot must verify the appearance of the
white SURFACE DE-ICE message following activation
of the surface deice system to protect
against failures of the WING/STAB switch.
WING DE-ICE FAIL Message
The amber WING DE-ICE FAIL message appears
if one or more of the pressure switches
in the wing deice system does not receive adequate
pressure.
This message also appears if pressure is sensed
in the boot with the switch in the OFF position.
TAIL DE-ICE FAIL Message
The amber TAIL DE-ICE FAIL message appears
when one or more of the pressure
switches in the tail deice system does not receive
adequate pressure.
This message also appears if pressure is sensed
with the switch in the OFF position (i.e., boot
is inflated when it should not be).
OPERATION
The wing and stabilizer deice system operates
under electrical control when set with the
WING/STAB switch in MANUAL or AUTO.
Manual Mode
During operation in manual mode, the pilot
holds the WING/STAB switch the MANUAL
position to inflate all of the deice boots. As
long as the pilot holds the switch, the deice
boots remain inflated. If all of the boot pressure
switches receive adequate pressure, a
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