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inlet leading edges. Each ENGINE ANTI-ICE
switch has two positions: L (or R) and OFF.
With the switches in the L or R (up) position,
bleed air is directed to the engine inlet for
each respective engine. In the OFF position,
bleed air is blocked at the PRSOV.
With either ENGINE ANTI-ICE switch in the
ON position, the undertemperature warning
system is enabled for both engines.
Throttles
The temperature of the air supplied to the engine
inlets is varied only by engine power
settings.
ENG A/I COLD L or R Message
If the inlet leading edges do not receive adequate
bleed air during use, the cold condition
is annunciated by the respective ENG A/I
COLD message. Undertemperature switches
are inside the hollow engine inlet leading
edges. After initial switch activation, the respective
white ENG A/I COLD message appears
while the undertemperature switches
are below the temperature setpoint. As each
inlet warms up, the respective ENG A/I COLD
message disappears.
NOTE
At ambient temperatures above approximately
10°C (50°F), the white
ENG A/I COLD messages may not
display. In this case, satisfactory operation
of the engine anti-ice system
can be verified by a small momentary
drop in N2 and a slight increase in
ITT when the respective ENG ANTIICE
switch is turned ON.
If an engine inlet does not heat up within 2 minutes
of initial switch activation or has cooled
below a safe level, the respective amber ENG
A/I COLD message appears.
OPERATION
When in icing conditions or when anticipating
icing conditions, set the ENGINE ANTI-ICE
switches to the L and R (up) positions. This
deenergizes the shutoff valves, allowing hot
bleed air to flow through and heat the engine.
When not in (or anticipating) icing conditions,
set the ENGINE ANTI-ICE switches to
the OFF positions. This energizes the shutoff
valves closed, stopping the flow of bleed air
to the engine inlets. This also increases engine
efficiency and available power.
SURFACE DEICE (WING
AND STABILIZERS)
DESCRIPTION
The Mustang uses pressure-regulated engine
bleed air (via the service air system) to operate
conventional pneumatic deicing boots. The
full-span boots protect the wing, vertical, and
horizontal stabilizer leading edges.
Service Air System
The pressurized air for inflating the pneumatic
boots is supplied by the service air system.
The service air is regulated to 20 psig by
a service air regulator (see Figure 10-3). The
service air system is always active during operation
of the aircraft. Bleed air from both engines
is routed to the service air regulator
through a check valve on each engine outboard
bleed-air supply duct. The check valves
keep bleed air from backflowing into either engine.
The service air system provides regulated
bleed air to the deice boot system. If one engine
fails, the operating engine can supply
enough bleed air to operate the wing, vertical,
and horizontal stabilizer deice system.
Surface Deice System
The Mustang has a surface deice system on the
wing, vertical, and horizontal stabilizers. This
system uses regulated bleed air to inflate pneumatic
boots to remove the ice. The boots, when
inflated, normally crack and separate the ice
from the leading edge of the protected surface,
allowing aerodynamic forces to remove the ice.
During normal operation, adequate pressure
supplied to the boots is annunciated by the white
SURFACE DEICE message. An amber WING
or TAIL DE-ICE FAIL message appears in the
CAS window if boot pressure is inadequate or
boot inflation cycle is not normal.
The deice boot pressure switches are immediately
downstream of each ejector flow control
valve (EFCV).
The regulated service air is supplied to the
wing and tail EFCVs, which supply either
pressure or vacuum to the deice boots. There
is one EFCV for each of the following four
boot sets (see Figure 10-1):
• Wing upper deice boots (left and right)
• Wing lower deice boots (left and right)
• Left horizontal stabilizer deice boot
• Right horizontal deice boot and vertical
stabilizer deice boots
The EFCVs are electrically powered closed to
inflate the boots and spring-loaded open.
The surface deice system operates in one of
three modes:
• Manual
• Automatic
• Inactive
COMPONENTS
Service Air Regulator
The service air regulator reduces the pressure
of the engine bleed air to 20 psig from a variable
　
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