Chapter 12: Ice and Rain Protection

Question 1

Ice and Rain Protection Components

Answer 1

• Ice Detectors
• Pneumatic Heating
  
  • Wing anti-ice
  • Engine anti-ice
• Electric Heating
  
  • Windshield heating
  • ADSP/TAT
  • Static port
  • Water lines
• Rain Protection
  
  • Windshield wipers

Question 2

Engine Ice Protection

Answer 2

• Hot air extracted from high stage bleed

- Engine anti-ice valve is fail safe open

Question 3

Wing Ice Protection

Answer 3

• Three (3) outboard slats are heated by engine bleeds

- One engine can provide bleed to both sides through the crossbleed valve

Question 4

Ice Detectors

Answer 4

• Two (2) installed on left and right side of nose
• Command A/I protection for 2 or 5 minutes, depending on the MOD
• Failure of one detector results in loss of redundancy
• Failure of both detectors results in manual control only

Question 5

Engine and Wing A/I Activation Logic

Answer 5

Engine:
     -REF A/I ALL -- Engine running
     -A/I mode ON -- Engine running
     -Ice detected -- 1,700' or 2 minutes
Wing:
     -REF A/I ALL -- Wheel speed > 40 kt
     -A/I mode ON -- Liftoff
     -Ice Detected -- 1,700' or 2 minutes

Question 6

Windshield Heating

Answer 6

• Only operates normally if there are two (2) AC sources
• Performs two (2), 120 second PBITs as soon as one AC source is first available
• If only one (1) AC source in-flight, only one (1) windshield is heated with captain’s side having priority

Question 7

ADSP/TAT Heating

Answer 7

• Automatic whenever and engine is running or the airplane is airborne
• Manual override button; if batteries are only power source, only ADSP 3 is heated

Question 8

Slat Anti-Ice PBIT

Answer 8

• Occurs 10 minutes after takeoff or reaching 10,000’

- Lasts 60 seconds or until all slat temperature sensors increase by 10 F