CHAPTER
30
Ice and Rain Protection
CHAPTER 30 Ice and Rain Protection
30-CONTENTS
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ICE AND RAIN PROTECTION -INTRODUCTION
Purpose
The ice and rain protection system keeps ice from forming on these airplane components:
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Wing leading edges
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Engine cowl leading edges
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Air data probes
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Flight deck windows
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Landscape camera window
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Water and waste system lines and drains.
Windshield wipers and a permanent chemical coating give rain protection to the flight deck windows.
Abbreviations and Acronyms
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ACIPS -airfoil and cowl ice protection system
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ADIRU -air data inertial reference unit
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ADM -air data module
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AFDC -autopilot flight director computer
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AGS -air/ground system
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AIMS -airplane information management system
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AOA -angle of attack
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CAC -controller air cooler
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CAS -computed air speed
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CMCS -central maintenance computing system
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EAI -engine anti-ice
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EEC -electronic engine control
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EICAS -engine indication and crew alerting system
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ELMS -electrical load management system
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ERU -engine relay unit
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HPFAC -high pressure fan air controller
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IDS -ice detection system
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int -intermittent
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LRU -line replaceable unit
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MFD -multi-function display
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PFC -primary flight computer
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PRSOV -pressure regulating and shutoff valve
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PRSOVC -pressure regulating and shutoff valve controller
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SAARU -secondary attitude and air data reference unit
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TAT -total air temperature
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WAI -wing anti-ice
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WHCU -window heat control unit
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WOW -weight on wheels
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ICE AND RAIN PROTECTION -INTRODUCTION
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ICE AND RAIN PROTECTION -GENERAL DESCRIPTION
Wing and Engine Anti-Ice Systems Drain and Water Line Heating
The wing anti-ice (WAI) and engine anti-ice (EAI) systems use hot air to prevent ice. Electric heaters prevent freezing in water and waste system lines and fittings.
Ice Detection System
The ice detection system detects ice and automatically controls the WAI and EAI systems.
Air Data Sensor Heat
Air data sensors have electric heaters to prevent ice.
Flight Deck Windows
Flight deck windows have electrical heaters to prevent fog and ice.
The windshields have wipers to remove rain. They also have a hydrophobic coating to keep rain off (repel rain). The coating helps flight crew vision in rain but is not necessary for operation in rain.
Landscape Camera Window
The landscape camera window has an electrical heater to prevent ice.
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ICE AND RAIN PROTECTION -GENERAL DESCRIPTION
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ICE AND RAIN PROTECTION -ICE PROTECTION MAINTENANCE PAGE
General Valve positions and air flow rates are calculated from air
pressure measurements upstream and downstream of the anti-The ice protection maintenance page shows this information:
ice valves.
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ALTITUDE -Airplane altitude in feet
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ENG TYPE -Engine manufacturer (GE, PW, or RR)
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TAT -Total air temperature in degrees C
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ICE DETECTOR -Status of the left and right ice detectors
(OFF, ENGINE, ENGINE/WING, or FAIL)
Engine Anti-Ice
The engine anti-ice part of the maintenance page shows this information:
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FANCASE DUCT LEAK SIGNAL -Status of the fan case
overheat detector (NORMAL, OVERHEAT, or FAIL)
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VALVE -EAI valve open, closed, or regulating
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SUPPLY AIR TEMP -EAI air supply temperature in degrees
C
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AIR PRESS -Pressure downstream of the EAI valves in psig
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AIR FLOW -Air flow through the EAI valves in kg/min.
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