DB's SY 737 Anti-Ice, Rain

Question 0

Window heat ON lights -

1. Illuminated (green)
2. Extinguished
3. What are the conditions that would cause the light to extinguish?

Answer 0

1. Window heat is being applied to the selected window
2. Window heat is not being applied to the selected window because;
3. 1. The switch is OFF or
   2. An overheat is detected or
   3. A system failure has occurred or
   4. System is at correct temperature

Question 1

Window OVERHEAT Lights - Illuminated (amber)

Answer 1

Overheat condition is detected

Question 2

WINDOW HEAT Switches

1. ON
2. OFF

Answer 2

1. Heat is being applied to selected window

2. Window heat is not in use

Question 3

WINDOW HEAT Test switch (spring-loaded to neutral)

1. OVHT
2. PWR TEST

Answer 3

1. Simulates an overheat condition

2. Provides confidence test

Question 4

How often does the windshield wiper run in INT mode?

Answer 4

Every 7 seconds

Question 5

Probe Heat lights - Illuminated (amber)

Answer 5

Related probe not heated

Question 6

PROBE HEAT Switches

1. ON
2. AUTO

Answer 6

1. Power is supplied to heat related system

2. Power is supplied to heat related system automatically

Question 7

COWL ANTI-ICE Lights - illuminated (Amber)

Answer 7

An overpressure condition in duct downstream of engine cowl anti-ice valve

Question 8

COWL VALVE OPEN lights

1. Illuminated (blue) bright
2. Illuminated (blue) dim
3. Extinguished

Answer 8

1. Related cowl anti-ice valve is in transit or the valve position disagrees with related ENGINE ANTI-ICE switch
2. Related cowl anti-ice valve is open (switch ON indication)
3. Related cowl anti-ice valve is closed (switch OFF indication)

Question 9

ENGINE ANTI-ICE Switches

1. ON
2. OFF

Answer 9

1. Related engine anti-ice valve is open and stick shaker logic is set for icing conditions
2. Related engine anti-ice valve is closed and stick shaker logic returns to normal if wing anti-ice has not been used

Question 10

Thermal Anti-Ice (TAI) indication (above N1 display on upper DU) - Illuminated

1. Green
2. Amber

Answer 10

1. Cowl anti-ice valve(s) open

2. Cowl anti-ice valve is not in position indicated by related engine anti-ice switch

Question 11

Wing Anti-Ice VALVE OPEN Lights

1. Illuminated (blue) bright
2. Illuminated (blue) dim
3. Extinguished

Answer 11

1. Related wing anti-ice control valve is in transit or position disagrees with switch
2. Related wing anti-ice control valve is open (switch ON indication)
3. Related wing anti-ice control valve is closed (switch OFF indication)

Question 12

WING ANTI-ICE Switch- OFF

Answer 12

WING ANTI-ICE control valves are closed

Question 13

WING ANTI-ICE Switch- ON (in the air)

Answer 13

1. Wing anti-ice control valves are open
2. Stick shaker logic is set for icing conditions for the remainder of the flight, regardless of subsequent switch position

Question 14

WING ANTI-ICE Switch- ON (on the ground)

Answer 14

1. Wing anti-ice control valves open if thrust on both engines is below takeoff warning setting and the temperature inside both distribution ducts is below thermal switch activation temperature
2. Control valves close if either engine thrust is above takeoff warning setting or thermal switch is activated in either distribution duct. Switch remains ON.
3. Switch trips OFF at lift-off

Question 15

Name the systems included in the anti-ice and rain systems.

Answer 15

1. Flight deck window heat
2. Windshield wipers
3. Probe and sensor heat
4. Engine anti-ice
5. Wing anti-ice

Question 16

What sensor is not heated?

Answer 16

Static ports

Question 17

What does the wing anti-ice system actually heat?

Answer 17

The three Inboard leading edge slats (it does not include the leading edge flaps or the outboard leading edge slats).