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L or R NAC switches are ON and that adequate bleed air pressure is being
supplied to each nacelle lip.
An amber NAC illumination indicates that the respective L or R NAC
switches are on with inadequate bleed air pressure being supplied to
the nacelle lip or a circuitry fault to the pressure/temperature sensor.
This EI will be accompanied by the L or R NAC HT amber CAS. If bleed
air pressure of 6.5 psi or greater is sensed at the nacelle anti-ice shutoff
valve with the L or R NAC switches off, the NAC amber EI will be accompanied
by the respective L or R NAC HT FAIL ON amber CAS.
Pilot’s Manual
6-6 PM-126A
The following CAS illuminations are specific to the nacelle inlet anti-ice
system:
WING/STAB ANTI-ICE SYSTEM
The wing/stab anti-ice system utilizes high pressure (HP) bleed air directed
through piccolo (diffuser) tubes in the leading edge of the wing
and horizontal stabilizer. The bleed air used to warm the wing is then
vented through the inboard wing boxes. The bleed air used to heat the
stabilizer is vented overboard at the outboard ends of the stabilizer.
System components consist of the piccolo tubes, anti-ice Pressure Regulating
Shutoff Valves (PRSOVs), anti-ice check valves, WING/STAB
ON/off switch, wing temperature control and under/overheat sensors,
electrical circuitry, and inputs from the integrated ECS temperature
controller.
As the bleed air transfers to the piccolo tubes, it is routed through the
pylon, into the tailcone, through a pressure regulating shutoff valve
and modulating valve, a check valve, and into a common manifold.
From the manifold, the wing supply duct branches forward and the
horizontal stabilizer supply branches aft to the piccolo tubes. Check
valves are provided to prevent bleed air cross flow from one source to
the other, thus providing pneumatic isolation of the two bleed air
sources.
The wing/stab anti-ice system is activated by selecting the WING/
STAB switch located in the ANTI-ICE panel to ON. Electrical power is
provided from the L and R MAIN buses through the respective circuit
breakers located within the ANTI-ICE group [L or R WING/STAB HT]
on the pilot’s and copilot’s circuit breaker panels. When activated, both
anti-ice PRSOVs are energized open. The system controller then uses
single control channels for each side to provide automatic control of the
airplane wing and stabilizer leading edge skin temperature.
CAS Color Description
NAC HT Amber - The associated (L or R) nacelle heat system
is turned on, but the bleed air pressure
to the nacelle is low.
or
- The associated (L or R) nacelle heat system
is turned on, but the PT2 heater is
failed.
NAC HT FAIL ON Amber The associated nacelle heat system is turned
off, but bleed air pressure is still present at
the nacelle.
Pilot’s Manual
PM-126A 6-7
Each wing is continuously monitored by a wing temperature control
sensor. The sensor supplies wing skin temperature information to a
system controller. The controller then regulates the amount of HP bleed
air allowed in the system by modulating the PRSOVs on each side to
maintain the colder of the two wings at the established temperature.
Under/overheat sensors also monitor wing and horizontal stabilizer
temperatures and provide under/overheat signals to the controller.
Should the temperature exceed the established high value on any
leading-edge surface, the sensors will trigger respective WING OVHT,
STAB OVHT, or WING/STAB OVHT red CAS/CWP regardless of antiice
systems being on or off. These CAS/CWP will extinguish once the
leading edge temperature drops into the normal range.
Should the temperature drop below the established low value on any
leading-edge surface with anti-ice systems on, the sensors will trigger
respective WING TEMP LOW or STAB TEMP LOW amber CAS. These
CAS will extinguish once the leading edge temperature reaches the
normal range.
Faults within the overheat/underheat sensors are indicated by illumination
of the corresponding WING TMP FAULT and/or STAB TMP
FAULT white CAS, and a WING and/or STAB TEMP LOW amber CAS
with the system On.
The following CAS illuminations are specific to the wing/stab anti-ice
system:
CAS Color Description
STAB OVHT Red The horizontal stabilizer leading edge is overheated.
WING/STAB LEAK Red A leak is detected in the ducting which supplies
bleed air to the wing/stabilizer heat
system.
WING OVHT Red The wing leading edge is overheated.
STAB TEMP LOW Amber Stabilizer heat is turned on, but the horizontal
stabilizer leading edge temperature is too low
　
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