B777
Anti‐Ice & Rain DO NOT USE FOR FLIGHT
Boeing B777 - Systems Summary [Anti-Ice & Rain]
Anti-Ice Panel ANTI-ICE WING AUTO OFF
L AUTO ON
OFF
ENGINE ON
R AUTO
OFF
ON
1
2
OVERHEAD PANEL
1
WING ANTI–ICE Selector
OFF – both wing anti–ice valves are commanded closed. AUTO – in flight, both wing anti–ice valves are commanded opened or closed automatically by the ice detection system. ON – in flight, both wing anti–ice valves are commanded open. 2
ENGINE ANTI–ICE Selectors
OFF – the engine anti–ice valve is commanded closed. AUTO – in flight, the engine anti–ice valve is opened or closed automatically by the ice detection system. ON – the engine anti-ice valve is commanded open. Note: If the ENGINE ANTI-ICE selector is in AUTO and the anti-ice valve is commanded open, or if the selector is in ON, then:
[Options – PW Engines] • approach idle is selected by the EEC and continuous ignition is automatically turned on. [Option – RR, GE Engines] • approach idle is selected by the EEC.
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Boeing B777 - Systems Summary [Anti-Ice & Rain]
Window Heat and Wiper Panels Window Heat Panel WINDOW HEAT L
R
SIDE
FWD
FWD
SIDE
ON
ON
ON
ON
INOP
INOP
INOP
INOP
1
OVERHEAD PANEL 1
WINDOW HEAT Switches
ON – window heat is applied to the selected windows. INOP (inoperative) illuminated (amber) – • the switch is OFF • an overheat is detected, or • a system fault has occurred.
Wiper Panels L WIPER
R WIPER
OFF
OFF INT LOW
INT 1
HIGH
HIGH
OVERHEAD PANEL
1
WIPER Selectors
OFF – the wiper is stowed at the base of the window. INT (intermittent) – the wiper operates intermittently. LOW – the wiper operates at low speed. HIGH – the wiper operates at high speed.
.
LOW
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Boeing B777 - Systems Summary [Anti-Ice & Rain] 3.20 Anti-Ice, Rain-System Description
Introduction
The anti–ice and rain systems include: • automatic ice detection • engine anti–ice • wing anti–ice
• flight deck window heat • windshield wipers • probe heat.
Automatic Ice Detection System The automatic ice detection system detects airplane icing in flight. The system consists of two ice detector probes on the forward fuselage. The system provides signals to control the engine and wing anti–ice systems when those systems are in the automatic mode. Automatic ice detection is inhibited on the ground.
Engine Anti–Ice System The engine anti–ice system uses engine bleed air to provide engine cowl inlet ice protection. Engine anti–ice can be operated in flight or on the ground. The engine anti–ice indication EAI is displayed above the EICAS N1 indication when an engine anti–ice valve is open. The left and right engines have identical, independent anti–ice systems. This allows the remaining system to operate if one engine is shutdown.
Engine Anti–Ice System Automatic Operation In flight, when the ENGINE ANTI–ICE selector is in AUTO, engine anti–ice system operation is automatic. When ice is detected, the engine anti–ice valves open and bleed air is supplied to the engine inlet cowl. When ice is no longer detected, the engine anti–ice valves close and bleed air is no longer supplied to the engine inlet cowl.
Engine Anti–Ice System Manual Operation On the ground or in flight, when the ENGINE ANTI–ICE selector is ON, engine bleed air opens the engine anti-ice valve and bleed air is supplied to the engine inlet cowl.
Engine Anti–Ice Leak Detection System Each engine has an anti–ice system duct leak detection system. If an anti–ice duct leak is detected, the respective engine anti–ice valve closes.
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Boeing B777 - Systems Summary [Anti-Ice & Rain]
Wing Anti–Ice System The wing anti–ice system provides bleed air to three midwing leading edge slats on each wing. Wing anti–ice is inhibited on the ground. When TAT is above 10 degrees C, wing anti-ice is inhibited for five minutes after takeoff. The wing anti–ice annunciation WAI is displayed below the EICAS N1 indication when a wing anti–ice valve is open. If a bleed source is unavailable and bleed duct isolation has not occurred, the isolation valves open automatically to maintain anti–icing to both wings.
Wing Anti–Ice System Automatic Operation In flight, when the WING ANTI–ICE selector is in AUTO, wing anti–ice system operation is automatic. When ice is detected, the wing anti–ice valves open and bleed air is supplied to the leading edge slats. When ice is no longer detected, the wing anti–ice valves close and bleed air is no longer supplied to the slats. If one wing anti–ice valve fails closed, the wing anti–ice system automatically closes the other valve to prevent asymmetrical wing anti–icing. Automatic wing anti–ice operation is also inhibited for 10 minutes after takeoff.
Wing Anti–Ice System Manual Operation In flight, when the WING ANTI–ICE selector is ON the wing anti–ice valve in each wing opens and bleed air is supplied to the leading edge slats.
Wing Anti–Ice System Leak Detection System The bleed duct leak and overheat detection system provides wing anti-ice leak detection.
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Boeing B777 - Systems Summary [Anti-Ice & Rain]
Anti–Ice System Schematic ANTI-ICE WING AUTO OFF
L AUTO ON
L PACK
OFF
DUCT PRESS
L
28
ENGINE ON
OFF
ON
R PACK
L
TRIM AIR
R
ISLN
C
ISLN
R
DUCT PRESS
28
AIR C2 HYD
AIR C1 HYD
WAI
R AUTO
WAI
APU EAI
START
L ENG
START
APU
START
R ENG
Wing Anti–Ice Valve
Engine Anti–Ice Valve
Flight Deck Window Heat All flight deck windows are electrically heated. The forward windows have exterior surface anti–icing, and interior surface antifogging protection. The side windows have interior surface antifogging protection only. The WINDOW HEAT switches control heating for all flight deck windows. A backup antifogging system for the forward windows operates automatically if the primary window heat system fails.
Windshield Wipers The forward windows are equipped with independently controlled, two–speed wipers. When the WIPER selector in OFF, the respective wiper is off and stowed. Page 5
Boeing B777 - Systems Summary [Anti-Ice & Rain]
Probe Heat Three pitot probes and two angle of attack probes are electrically heated for anti-ice protection when either engine is operating. The total air temperature probe is electrically heated for anti-ice protection in flight.
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Boeing B777 - Systems Summary [Anti-Ice & Rain]
3.30 Anti-Ice, Rain-EICAS Messages
Anti-Ice, Rain System EICAS Messages The following EICAS messages can be displayed. Message
Level
Aural
Condition
ANTI–ICE ENG L, R
Advisory
Engine anti–ice valve remains closed when commanded open.
ANTI–ICE LEAK ENG L, R
Caution
ANTI–ICE LOSS ENG L, R
Advisory
Anti–ice bleed air for the affected engine is no longer available.
ANTI–ICE ON
Advisory
Any anti–ice selector is ON, air temperature is above 10 degrees C, and ice is not detected.
ANTI–ICE WING
Advisory
One or both wing anti–ice valves remain closed when commanded open.
HEAT PITOT C
Advisory
Center pitot probe heat is inoperative.
HEAT PITOT L
Advisory
Left pitot probe heat is inoperative.
HEAT PITOT L+C+R
Advisory
All pitot probe heats are inoperative.
HEAT PITOT R
Advisory
Right pitot probe heat is inoperative.
ICE DETECTORS
Advisory
Ice detection has failed.
ICING ENG
Caution
ICING WING
Advisory
Ice is detected and wing anti–ice selector is OFF, or ice is detected and wing anti-ice takeoff inhibit is active.
WINDOW HEAT
Advisory
Two or more window heats are off.
WINDOW HEAT L, R FWD
Advisory
Primary window heat for the affected forward window is off.
WINDOW HEAT L, R SIDE
Advisory
Window heat for the affected side window is off.
Beeper
Beeper
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High temperature anti–ice bleed air leak is detected in the affected engine.
Ice is detected and one or both engine anti–ice selectors are OFF.
