Anti-Ice/Rain

Question 1

Illuminations of Probe Heat Light

Answer 1

• probe(s) is/are not being heated inflight or engine not running on the ground
• if TAT not heated Autothrottles will disconnect

Question 2

Systems protected from Ice/rain

Answer 2

• engines (pneumatically)
• wings (pneumatically)
• flight deck windows (electrically)
• Probes (electrically)

Question 3

Protections provided when engine anti-ice is activated

Answer 3

• engine ignition is automatically activated for flameout prevention
• reference bug displayed on N1 during single engine operation
• Max EPR limits are automatically reduced

Question 4

Which portion of the wing is protected by the anti ice system

Answer 4

• 3 mid wing leading edge slats (757)
• 3 outboard leading edge slats (767)
• wing anti-ice inhibited on the ground

Question 5

Flight Deck window protection

Answer 5

• electrically heated
• fwd windows have anti-icing and anti-fogging protection
• side windows have anti-fogging protection
• all windows have overheat protection

Question 6

When are windows heated?

Answer 6

• window heat switch ON

- electrical power supplied to the aircraft

Question 7

When are probes heated?

Answer 7

• Pitot and AOA after engine start

- TAT inflight only

Question 8

What happens with Fuel Jettison switch is selected ON (767)

Answer 8

• WINDOW HEAT EICASE displays

- electrical power for the aft-most cockpit window heat (L-3 and R-3) is load shed

Question 9

Ice Crystal Conditions

Answer 9

♦ Amber or red weather radar returns below aircraft
♦ Appearance of liquid water on windshield at temperatures too cold for rain (sound is
different than rain)
♦ Autothrottle unable to maintain selected airspeed
♦ TAT indication stays near 0° C