3. Anti Icing and Rain

What systems are included in the anti-ice and rain systems on the Boeing 737-800?

• Flight Deck Window Heat, Engine Anti-Ice System, Windshield Wipers, Wing Anti-Ice System, Probe and Sensor Heat
• Flight Deck Window Heat, Pitot Heat, Wing Anti-Ice System, Windshield Wipers, Recirculation Fans
• Engine Anti-Ice System, Windshield Wipers, Hydraulic Anti-Ice, Probe and Sensor Heat, Ram Air System
• Windshield Wipers, Wing Anti-Ice System, Probe and Sensor Heat, Engine Anti-Ice System, Electrical Anti-Ice
• None

Answer explanation

The anti-ice and rain systems include Flight Deck Window Heat, Engine Anti-Ice System, Windshield Wipers, Wing Anti-Ice System, Probe and Sensor Heat.

Which flight deck windows are electrically heated to prevent ice build-up and fogging on the Boeing 737-800?

• Window numbers 1 and 3
• Window numbers 1 and 2
• Window numbers 2 and 3
• All flight deck windows
• None

Answer explanation

Window numbers 1 and 2 have a conductive coating that permits electrical heating to prevent ice build-up and fogging.

What is the purpose of the temperature controllers for window numbers 1 and 2 on the Boeing 737-800?

• To prevent fogging
• To maintain maximum strength in the event of bird impact
• To prevent overheating
• To reduce electrical consumption
• None

Answer explanation

Temperature controllers maintain window numbers 1 and 2 at the correct temperature to ensure maximum strength in the event of bird impact.

What can occur if the windshield wipers are operated on a dry windshield on the Boeing 737-800?

• Improved visibility
• Windshield scratching
• Overheating of wipers
• Activation of windshield heat
• None

Answer explanation

Windshield scratching will occur if the windshield wipers are operated on a dry windshield.

What probes and sensors are electrically heated on the Boeing 737-800?

• Pitot probes, total air temperature probe, and alpha vanes
• Static ports, total air temperature probe, and alpha vanes
• Pitot probes, static ports, and alpha vanes
• Total air temperature probe, static ports, and alpha vanes
• None

Answer explanation

Pitot probes, the total air temperature probe, and the alpha vanes are electrically heated.

What prevents the formation of ice on the engine cowl lip on the Boeing 737-800?

• Electric heating
• Engine bleed air thermal anti-icing
• Ground air cart
• Engine cowl lip covers
• None

Answer explanation

Engine bleed air thermal anti-icing prevents the formation of ice on the engine cowl lip.

What happens if the cowl anti-ice valve fails to move to the position indicated by the ENG ANTI-ICE switch on the 737-800?

• The ENG ANTI-ICE switch illuminates
• The COWL VALVE OPEN light remains illuminated bright blue and an amber TAI indication illuminates on the CDS
• The COWL VALVE OPEN light turns off
• The engine shuts down
• None

Answer explanation

If the cowl anti-ice valve fails to move to the position indicated by the ENG ANTI-ICE switch, the COWL VALVE OPEN light remains illuminated bright blue and an amber TAI indication illuminates on the CDS.

Which leading edge slats are protected by the wing anti-ice system on the Boeing 737-800?

• All leading edge slats
• Inboard leading edge slats
• Outboard leading edge slats
• Leading edge flaps only
• None

Answer explanation

The wing anti-ice system provides protection for the three inboard leading edge slats.

When does the WING ANTI-ICE switch automatically trip OFF on the Boeing 737-800?

• At liftoff when the air/ground sensor goes to the air mode
• When the engine thrust is above the takeoff warning setting
• When the airspeed exceeds 250 knots
• When the cabin altitude is above 10,000 feet
• None

Answer explanation

The WING ANTI-ICE switch automatically trips OFF at liftoff when the air/ground sensor goes to the air mode.

What sets the stall warning logic for icing conditions on the Boeing 737-800?

• Positioning the WING ANTI-ICE switch to OFF
• Positioning the ENG ANTI-ICE switch to OFF
• Positioning the WING ANTI-ICE switch to ON
• Positioning the ENG ANTI-ICE switch to ON
• None

Answer explanation

Positioning the ENG ANTI-ICE switches to ON sets the stall warning logic for icing conditions.