Ice and Rain Protection

Question 1

Which subsystems do the ice and rain protection include?

Answer 1

Wings, horizontal stab, engine air intakes, pitot and static, windshields.

Question 2

What heats the engine nacelle intake?

Answer 2

Engine bleed air.

Question 3

With the loss of electrical power, what is the default position of the engine anti-ice valves?

Answer 3

Open, providing continuous bleed air the engine inlet.

Question 4

What does a “A-I E ½ Fail” indicate?

Answer 4

Loss of anti-ice protection to that engine; must avoid icing conditions.

Question 5

How are the wings and horizontal stab heated?

Answer 5

Each side is heated using bleed air from the respective side engine; if one bleed source fails the entire system is heated from the remaining source.
(The pneumatic system supplies bleed air at controlled temperature and pressure to the WHSAIS, (Wing and Horizontal Stabilizer Anti-Icing System), using controlled hot bleed air from the compressor engines. The hot air is then delivered to piccolo tubes for heating the wings and stab).

Question 6

In order to deal with engine bleed air flow limitations, how is the WHSAIS operation limited?

Answer 6

By a WHSAIS envelope. (Temperature and altitude are the two variables that determine the envelope’s parameters. If the aircraft is flying inside the envelope and the wingstab switch is ON, the FADEC increases the engine idle levels to provide the minimum engine bleed pressure and temperature required for proper operation).

Question 7

What does “A-I WINGSTB INHB” CAS message indicate?

Answer 7

WHSAIS switched ON outside the icing envelope. Or, aircraft is in single bleed configuration and above the 15,000 ft. icing envelope when WHSAIS is switched on.

Question 8

At what altitude is the WHSAIS operation limited to in a single-bleed source scenario?

Answer 8

15,000ft