737 Anti-ice

Question 1

Overhead - Wing/Engine Anti-Ice

Answer 1

Indicates an overpressure in the duct downstream of the valve has occured.

Question 2

Overhead - Wing/Engine Anti-Ice

Answer 2

Bright - Control Valve is in transit or disagrees

Dim - Valve is open (ON)

Extinguished - Valve is closed (OFF)

Question 3

Overhead - Wing/Engine Anti-Ice L/R VALVE OPEN

Answer 3

Extinguisehd - Siwtch is OFF and valve is closed

Dim - Switch is ON and valve is open (normal)

Bright - Valve is in transit OR, valve position disagree

Question 4

Overhead - Window Heat / Probe Heat

Answer 4

Illimuinated when respective probe not heated.