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for effective anti-icing.
WING TEMP LOW Amber Wing heat is turned on, but the wing leading
edge temperature is too low for effective
anti-icing.
Pilot’s Manual
6-8 PM-126A
STAB TMP FAULT White - A horizontal stabilizer temperature sensor
has failed.
or
- The horizontal stabilizer high or low temperature
sensor is invalid.
WING TMP FAULT White - A wing temperature sensor has failed.
or
- The wing high or low temperature sensor is
invalid.
WG/STAB HT OK White The wing/stabilizer heat system checks OK.
CAS Color Description
Pilot’s Manual
PM-126A 6-9
WING/STAB ANTI-ICE SYSTEM SCHEMATIC
Figure 6-2
1. WING/STAB LEAK
2. STAB OVHT
3. WING OVHT
4. STAB TEMP LOW
5. WING TEMP LOW
6. STAB TMP FAULT
7. WG/STAB HT OK
8. WING TMP FAULT
EICAS MESSAGES
ANTI-ICE
SYSTEM
CONTROLLER
SPENT AIR VENTED
TO WING BOX
HP BLEED
AIR FROM
RIGHT
ENGINE
HP BLEED
AIR FROM
LEFT
ENGINE
ELECTRICAL
HP BLEED AIR
ANTI-ICE SHUTOFF/REGULATOR VALVE
CHECK VALVE
PICCOLO TUBES
HIGH/LOW TEMPERATURE LIMIT SENSOR
TEMPERATURE SENSOR
Pilot’s Manual
6-10 PM-126A
WINDSHIELD DEFOG AND ICE PROTECTION
Windshield defogging and ice protection is accomplished using electrically
heated windshield panels. The system is designed so that if desired,
it may be activated before takeoff and remain on until shutdown.
The system is comprised of two windshield panels with integral heaters,
dual-channel windshield heat control unit, system switches, engine
driven alternators and associated aircraft wiring.
The same windshield panels are used for defogging and ice protection.
The dual-channel windshield heat control unit automatically regulates
windshield temperatures to preclude the formation of external ice and
internal windshield surface condensation (fogging). Separate L and R
WSHLD switches and power supplies provide for system redundancy.
Each system utilizes the 200-vac output from an alternator on its respective
engine to power the integral heaters. The control circuit receives
28-vdc through the 5-amp WSHLD circuit breakers located
within the ANTI-ICE group [L and R HEAT] on the pilot’s and copilot’s
circuit breaker panels.
During normal operation the controller regulates the output of the alternators
to maintain the desired windshield temperature. If there is a
fault in the circuitry for normal operation, the system can continue to
operate in a degraded mode. In the degraded mode the output of the
alternator is no longer modulated and the controller cycles power full
to the windshield. The controller continues to cycle power on and off to
control operation when functioning in the degraded mode.
The following CAS illuminations are specific to the windshield defog
and ice protection systems:
CAS Color Description
WSHLD HT FAIL Amber The associated (L or R) windshield heat system
is on, but the windshield temperature is
too low for effective anti-icing.
WSHLD OVHT Amber The associated (L or R) windshield is overheated.
WSHLD HT FAULT White The associated (L or R) windshield heat system
is operating but in a degraded mode.
Pilot’s Manual
PM-126A 6-11
WINDSHIELD ANTI-ICE SCHEMATIC
Figure 6-3
CAS MESSAGES
5 KVA
ALTERNATOR
L WSHLD R WSHLD
L HEAT
WSHLD
R HEAT
WSHLD
RELAY
L WSHLD
CONTROLLER
CHANNEL
R WSHLD
CONTROLLER
CHANNEL
DAU 1 DAU 2
5 KVA
ALTERNATOR
L ESS BUS R ESS BUS
WINDSHIELD CONTROLLER
RELAY
1. L WSHLD OVHT
2. R WSHLD OVHT
3. L WSHLD HT FAIL
4. R WSHLD HT FAIL
5. L WSHLD HT FAULT
6. R WSHLD HT FAULT
NORMAL SENSOR
OVHT SENSOR
ELECTRICAL
HEATING ELEMENT HEATING ELEMENT
1 3
5
2 4
6
A30-0005
Pilot’s Manual
6-12 PM-126A
BAGGAGE COMPARTMENT HEATING SYSTEM
The tailcone baggage compartment features a heating system to prevent
the unpressurized compartment from freezing. An ON/OFF
switch located in the ceiling of the compartment provides for control.
Once the system switch has been turned ON before flight, operation of
the system is fully automatic and requires no crew regulation or monitoring.
Baggage compartment heat is available for both ground and inflight
operations.
Heating is provided through electrical blanket heaters installed on the
left, right and bottom sides of the tailcone baggage compartment. Two
　
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