Anti-ice / de-ice

Question 1

What the diference beween deicing and anti icing?

Answer 1

Anti - prevents ice forming
deicing - clears ice that’s already formed

Question 2

Which parts of an airframe (including wings and control surfaces) must be clear of contaminates

Answer 2

All of it.

Question 3

Most commercial air transport aircraft (CAT) have onboard anti-icing and/or de-icing. It works on the engines, main wings but not always on the…..

Answer 3

Horizontal stabiliser or fin

Question 4

A small but important selection of things are also de-iced (heated) on the fuselage?

Answer 4

Sensors and probes

Question 5

What are the 4 main types of on-board airframe de-icing and anti-icing systems?

Answer 5

Bleed air
Electrical heating mats
Fluid
Inflatable boots

Question 6

What are the 3 types of ice indicator?

Answer 6

Electromechanical
Mechanical
Electrical using reference and detector loops

Question 7

Describe Electromechanical ice indicator

Answer 7

Vibrating probe. If the frequency changes, there is ice build up. Light comes on, as does the heat.
Heat turns off and probe vibrates again.

repeat

Question 8

Describe Mechanical ice indicator

Answer 8

Probe with holes on leading and trailing edge.

If leading edge gets blocked with ice there is a change in pressure in an aneroid capsule.

Light comes on, probe heat comes on.

Repeat

Question 9

Describe electrical ice detector

Answer 9

Two circuits.
One away from ice (reference)
One on leading edge.

If there is a difference then ice is likely.

Question 10

How can propellors get deiced?

Answer 10

Fluid from the spinner
heated elements on the blades

Question 11

Flight deck windscreens are de-iced by __________ _______

Answer 11

electrical heating