ICE AND RAIN

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 antiice 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