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October 1, 2000
747 Operations Manual
Anti-Ice, Rain Chapter 3
Controls and Indicators Section 10
Copyright © The Boeing Company. See title page for details.
D6-30151-425 3.10.1
Nacelle andWing Anti-Ice
Nacelle andWing Anti-Ice Panel
1 NACELLE ANTI–ICE Switches
OFF – nacelle anti–ice valves commanded closed
AUTO –
• in flight, nacelle anti-ice operates in response to inputs from the ice
detection system. Requirements for valve operation are the same as ON
position
• on the ground, system off
ON –
• valve opens when bleed air pressure available
• engine igniters selected by Auto Ignition selector and EEC operate
continuously
• PRV opens when nacelle anti-ice on, unlessPRV closed by:
• prior or present bleed air overheat, or
• start valve not closed, or
• HP bleed valve failed open
2 WING ANTI–ICE Switch
OFF – wing anti–ice valves commanded closed
3 ANTI-ICE
AUTO
1
2
4
OFF ON
AUTO
NACELLE
ON
OFF
WING ANTI-ICE
OVERHEAD PANEL
1
2
October 1, 2000
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
3.10.2 D6-30151-425
Anti-Ice, Rain -
Controls and Indicators
AUTO –
• in flight with leading edge flaps retracted, wing anti-ice valves open in
response to inputs from the ice detection system
• on the ground, system off
ON –
• in flight with leading edge flaps retracted, wing anti-ice valves open to
supply bleed air to the left and right wing leading edges
• on the ground, system off
Windshield Heat and Washers
Windshield Heat and Washers Panel
1 WINDOW HEAT Switch
ON – controlled heat applied to the windshield
2 WINDOW HEAT Inoperative (INOP) Light
Illuminated (amber) -
• windshield overheat or controller fault has been detected
• power removed from windshield
3 Windshield WIPER Selector
OFF - wipers off and sequenced to stowed position
LO - wipers operate at low speed
HI - wipers operate at high speed
OFF
LO
HI
RAIN REP WINDOW HEAT
ON
WASHER
ON ON
INOP INOP
RAIN REP
OFF
LO
HI
WIPER L-WINDSHIELD-R WIPER
OVERHEAD PANEL
1
3
4
2
5
April 01, 2001
747 Operations Manual
Anti-Ice, Rain -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 3.10.3
4 WINDSHIELD L, R WASHER Switch
Spring loaded to neutral
ON - applies washer fluid
5 RAIN Repellent (REP) Switch
Push - measured amount of rain repellent applied to windshield
Note: Do not use on dry windshield.
Windshield Air Switch
1 Windshield (WSHLD) AIR Switch
ON – turns on air to windshield
OFF - windshield air off
ON
OFF
WSHLD AIR
1
CAPTAIN’S AUXILIARY PANEL
FIRST OFFICER’S AUXILIARY PANEL
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
3.10.4 D6-30151-425
Anti-Ice, Rain -
Controls and Indicators
WindshieldWasher Fluid
LOW LEVEL
REFILL
BOTTLE
LOW LEVEL REFILL BOTTLE
- minimum level for normal operation
LEFT HAND SIDE PANEL
IN BOOK STOWAGE
December 01, 1999
747 Operations Manual
Anti-Ice, Rain Chapter 3
System Description Section 20
Copyright © The Boeing Company. See title page for details.
D6-30151-425 3.20.1
Introduction
The anti–ice and rain systems include:
Anti-Ice Systems
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 nacelle and wing anti–ice systems when
those systems are in automatic mode.
Nacelle Anti–Ice System
The nacelle anti–ice system uses engine bleed air to provide engine cowl inlet ice
protection. Nacelle anti–ice can be operated in flight or on the ground. The nacelle
anti–ice indication NAI is displayed beside the EICAS N1 indication when the
nacelle anti–ice valve is open.
When nacelle anti-ice is commanded on, the selected engine igniters operate
continuously.
Nacelle Anti–Ice System Automatic Operation
In flight, when the NACELLE ANTI-ICE switch is in AUTO, nacelle anti–ice
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