3. Anti-Ice, Rain

Question 1

Window OVERHEAT Light

Answer 1

Also illuminates if electrical power to window is interrupted

Question 2

Windshield WIPER Selectors

Answer 2

INT: 7s intermittent operation

Question 3

PROBE HEAT Switch AUTO

Answer 3

Automatically powered when either engine is running

Question 4

COWL ANTI-ICE Lights

Answer 4

Indicates overpressure condition in duct downstream of Engine Cowl Anti-ice valve

Question 5

Anti-Ice Usage and Stick Shaker Logic

Answer 5

• When using EAI, logic is set for icing conditions. After EAI turned OFF logic turns to normal
• When using WAI, logic is set for icing conditions for the remainder of the flight whether WAI turned OFF or not,
• FMC displayed Vref is not adjusted when icing logic is active,
• Stick Shaker and Minimum Maneuver Speed Bars are adjusted when icing logic is active

Question 6

Flight Deck Window Heat

Answer 6

• # 1 & 2 Windows: Consist of glass panes laminated each side of a vinyl core,
• # 3 Window: Consist of two acrylic panes seperated by an air space,
• Conductive coating on the outer glass pane of #1 & 2 permits electrical heating,
• Ensures maximum strength of the windows in the event of bird impact
• # 3 window is not electrically heated,
• Temperature Controllers are crosswired: L Controller controls L1 & R2

Question 7

CAPT PITOT Light

Answer 7

• When operating on standby power, only Captain’s Pitot Probe is heated,
• However CAPT PITOT light does not illuminate for a failure,
• Pitot Probe for Standby Airspeed is not heated when operating on Standby Power

Question 8

EAI and WAI Protected Areas

Answer 8

• EAI: Cowl Lip of engines,
• WAI: 3 Inboard Leading Edge Slats

Question 9

WAI Power

Answer 9

Control valves are AC motor operated

Question 10

WAI Operation On The Ground

Answer 10

When switch is ON, opens both control valves if:
- Thrust on both engines is below T/O warning activation and,
- Temperature inside both wing distribution ducts is less than the thermal switch activation temperature,
- On ground mode, Switch remains in the ON position regardless of valve position,
- Switch automatically trips OFF at lift-off when air mode activated