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ICE AND RAIN PROTECTION
Table of Contents
Vol. 2 14−00−2
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
Page
GENERAL
There are four anti-iced areas on the Challenger 604:
• Wing leading edges
• Engine cowls
• Windshield and windows, and
• Air data probes
The wing leading edges and the engine intake cowls are anti-iced using engine 14th-stage bleed air.
The windshield, windows and air data probes are anti-iced using electrical power. An ice detector
system provides EICAS indications of ice accumulation
Anti-icing of the aircraft tail surfaces is not required.
WING ANTI-ICE SYSTEM
Description
The left and right wing leading edges are anti-iced using pressure regulated 14th-stage bleed air,
distributed by wing anti-ice ducting and piccolo tubes. The system is controlled by the WING
ANTI-ICE switch located on the ANTI-ICE panel. The WING ANTI-ICE switch normally controls the
left and right wing anti-ice valves, via wing-mounted control sensors and the wing anti-ice
controller. An isolation valve allows both wings to be anti-iced from a single bleed source via a
crossover duct. Panel lights and EICAS messages provide indications of system status during
operation.
ICE AND RAIN PROTECTION
Description
Vol. 2 14−10−1
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
WING ANTI-ICE SYSTEM (CONT'D)
Wing Anti-Ice System
Figure 14−10−1
Components and Operation
Anti-Ice Ducts
Bleed air taken from the 14th-stage bleed air manifold is ducted to the wing and ejected from the
piccolo tubes onto the inner surfaces of the leading edges. After heating the leading edges, the
air is exhausted overboard through louvers located beneath each wing leading edge. The
piccolo tubes extend the full length of the leading edge.
ICE AND RAIN PROTECTION
Description
Vol. 2 14−10−2
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
WING ANTI-ICE SYSTEM (CONT'D)
Wing Anti-Ice Components
Figure 14−10−2
Wing Anti-Ice Valves
The left and right wing anti-ice valves are electrically controlled, pneumatically operated,
pressure-regulating shutoff valves. The valves are spring-loaded to the closed position when no
14th-stage pressure is available, or electrical control power is lost. The wing anti-ice system is
normally operated in the NORM mode. A backup mode (STBY mode) exists should NORM
mode fail. The valves are set to regulate at 35 ± 5 psig. During modulation, the regulated
pressure will be lower than this value.
Wing Anti-Ice Controller
The wing anti-ice controller maintains the temperature of the left and right wing leading edges
when NORM mode is selected. The wing anti-ice controller is bypassed when STBY mode is
selected.
NORM Mode
When the WING ANTI-ICE switch is selected to the NORM position, the wing leading edge
temperatures are continuously monitored by their respective control sensor. The wing anti-ice
controller modulates both wing anti-ice valves simultaneously to maintain a constant wing
leading edge temperature (88°C/190°F).
The green L HEAT/R HEAT lights, located on the ANTI-ICE panel, will illuminate when the
respective wing leading edge is sufficiently heated to prevent ice accumulation (above
29°C/85°F).
ICE AND RAIN PROTECTION
Description
Vol. 2 14−10−3
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
WING ANTI-ICE SYSTEM (CONT'D)
STBY Mode
When the WING ANTI-ICE switch is selected to the STBY position, the wing anti-ice controller
is bypassed, and both wing anti-ice valves are independently controlled by their respective
standby thermal switch. The valves will cycle either fully open or fully closed, to maintain the
wing leading edge temperature within a predetermined temperature range (49°C/120°F and
82°C and 180°F).
Wing Overheat
Should a wing leading edge reach a temperature of 129°C/265°F or greater, the WING OVHT
warning EICAS message will appear, accompanied by the “WING OVERHEAT” voice warning
anf the flashing MAST WARN lights. Once the temperature drops below this value, the WING
OVHT warning message will be removed.
14th-Stage Isolation Valve
The isolation valve allows both wings to be anti-iced from a single source, by using the
crossover duct. The 14th-stage isolation valve is normally closed during wing anti-icing. Should
a wing anti-ice valve fail, or if an engine is not capable of supplying 14th-stage bleed air, the
　
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