C-27J ICE Detection/Protection/Demist/Rain Removal

Question 1

Electronic Ice Detector Purpose

Answer 1

Provides electronic warning to crew when aircraft is subjected to icing conditions. 0.5mm Ice Accretion activates it.

Question 2

Electronic Ice Detector Location

Answer 2

Lower forward portion of fuselage (under nose) just ahead of the nose gear.

Question 3

Electronic Ice Detector Theory of Operation (How do it work?)

Answer 3

Vibrates normally, when ice accretes on the detector the natural frequency of vibration is modified and detected. Activates ACAWS “ICE CONDITION” Caution message

Question 4

Should Ice remain on the detector probe?

Answer 4

As soon as Ice is detected, a heating circuit is activated to melt the ice on the probe. Time less than 7 seconds. Over heat protection exists at 54.4 deg C.

Question 5

How long is the “ICE CONDITION” maintained active?

Answer 5

60 seconds +/- 10

Question 6

Where is the Visual Ice Detector?

Answer 6

Probe mounted on the left side near the pilot sliding window

Question 7

Where is the bleed air for nacelle ice protection supplied from?

Answer 7

Engine compressor 14th stage independently of the bleed air used for airframe ice protection and environmental control

Question 8

What controls the engine/nacelle anti-icing valves?

Answer 8

The Engine Nacelle Interface Unit (NIU), one for each engine