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white SURFACE DE-ICE message appears.
CITATION MUSTANG OPERATING MANUAL
510OM-00 10-7
If one or more of the pressure switches does
not receive adequate pressure, the appropriate
amber WING DE-ICE FAIL and/or TAIL
DE-ICE FAIL message appears.
Following release of the MANUAL switch,
the spring-loaded switch immediately returns
to the AUTO position, but the automatic cycle
is delayed for 2 minutes before restarting the
inflation sequence. This prevents the lower
wing/left horizontal stabilizer deice boots from
immediately inflating after the pilot releases
the switch from the MANUAL position.
Automatic Mode
During automatic mode, the crew selects the
WING/STAB switch to AUTO. This activates
a timer, which causes the boots to inflate and
deflate in a sequence that repeats every 2 minutes
(Figure 10-4). The sequence repeats continuously
until the OFF or MANUAL switch
positions are selected. When selected OFF,
the deice system completes the 2-minute inflation
cycle to prevent any asymmetric ice accumulation.
Figure 10-4 illustrates the
automatic boot inflation cycle.
As in the manual mode, if all of the appropriate
boot pressure switches receive adequate
pressure, the white SURFACE DE-ICE message
appears. If one or more of the pressure
switches do not receive adequate pressure or
if the boots do not inflate in the proper timed
sequence, the appropriate amber WING DEICE
FAIL and/or TAIL DE-ICE FAIL message
appears.
Inactive
Whenever the boots are not being inflated,
vacuum is applied to the boots to hold them
down. This is true in automatic mode when not
in the inflation period of the deice cycle. This
is also true whenever the system is set to OFF.
WINDSHIELD ICE AND
RAIN PROTECTION
The Mustang glass windshields include electric
anti-icing/defogging and have a rain repellent
applied. Individual sections of each windshield
have different levels and sources of protection.
DESCRIPTION AND
COMPONENTS
The Mustang uses 28-VDC electric power to
provide windshield anti-ice and defog capability
(Figure 10-5). Each windshield incorporates
wire filament heaters in three separate zones:
• Inner zone—Provides both anti-ice and
defog capability.
• Middle zone—Provides both anti-ice
and defog capability.
• Defog zone—Provides defog capability
only.
CITATION MUSTANG OPERATING MANUAL
10-8 510OM-00
PRESSURE APPLIED TO DEICE BOOTS
VACUUM APPLIED TO DEICE BOOTS
LEGEND
TIME (SEC)
LOWER WING BOOTS
LEFT HORIZONTAL STABILIZER
UPPER WING BOOTS
RIGHT HORIZONTAL STABILIZER
VERTICAL STABILIZER
0 6 12 120
Figure 10-4. Wing Stabilizer Automatic Deice Cycle
NOTE
The upper region of each zone provides
reduced heat. However, it is
powered as part of the corresponding
anti-ice or defog zones.
Each anti-ice zone has two temperature sensors
(Figure 10-6). The primary sensor controls
the temperature and monitors for overheats. If
the primary sensor fails, the corresponding secondary
sensor provides those functions.
Electrical power is distributed to each windshield
zone by an anti-ice controller. Each controller
receives DC power from two sources:
• Heating power comes to each controller
directly from its respective feed bus
through a 100-amp current limiter.
• Control and monitoring functions of
each controller are powered from the respective
feed bus through an extension
bus, then through the corresponding L
or R WSHLD TEMP circuit breaker (on
the same side CB panel).
There are two separate windshield anti-ice
controllers. Each controller can recognize a
loss of generated DC power to the other controller;
in that case, the controller that still has
generated DC power automatically load sheds
to only provide heat to one anti-ice panel on
the left windshield. If both generators fail,
windshield anti-ice is not available.
If one windshield anti-ice controller fails, but
both generators continue to supply DC power,
only the zones powered by the functioning
controller continue to operate.
Rain Repellent
A passive rain repellent coating on the windshield
external surface provides windshield
rain protection. The coating requires periodic
inspection and refurbishment.
CONTROLS AND INDICATIONS
WINDSHIELD ANTI-ICE
Switches
The windshield heat is controlled by two toggle
switches in the cockpit (one for each windshield
panel) (Figure 10-7). The L and R
　
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