Anti Ice and Wing Protection

Question 1

Anti-ice location

Answer 1

• Engine cowls are heated by engine bleed air
• Three mid-wing slats heated by bleed air from right and left bleed air ducts
• Flight deck windows and all probes are heated electrically

Question 2

Primary ice detection system

Answer 2

• It is fully automatic
• It includes 2 fuselage side-mounted probes
• If ice build up is sensed by either probe, both probes heated until fully de-iced (Icing cycle)
• Wing anti-icing delayed until greater number of ice build cycles occur

Question 3

Wing anti-ice extra info 1

Answer 3

Wing Anti-ice can only be activated during flight

Question 4

-All Anti-ice systems are inhibited for 5 minutes after take-off if the temp is at or above 10 degrees Celsius

Answer 4

-Automatic operation is inhibited until 10 minutes after T/O thrust is set or until thrust is set to CLB thrust

Question 5

Window Heat system

Answer 5

• The window heat system electrically heats all flight deck windows
• When system is activated a ‘reduced power warm cycle’ is used to decrease thermal shock
• All windows are heated for anti-fog protection
• Forward windows heated for anti-ice protection

Question 6

Windshield rain removal

Answer 6

• A liquid repellent system is not installed on the 777
• The pilots’ windshield are treated with a ‘hydrophobic coating’
• Hydrophobic coating causes water droplets to roll off with minimal wind. As speed increases so does the effectiveness of the coating