Icing & Rain Protection

Question 1

Which areas of the airplane are heated by bleed air?

Answer 1

The wing and horizontal stabilizer leading edges and the engine air inlet lips

AOM 2-15-05 page 1

Question 2

Which areas of the airplane are heated electrically?

Answer 2

• windshields
• pitot tubes
• pitot-static tube
• AOA sensors
• TAT probes
• ADC static ports
• pressurization static ports
• lavatory water drain
• the water service nipples

AOM 2-15-05 page 1

Question 3

Can the APU bleed air be used for anti-icing?

Answer 3

No. The APU bleed air is not hot enough.

AOM 2-15-10 page 2

Question 4

How many seconds should the ice detection test be limited to?

Answer 4

15 seconds

AOM 2-15-10 page 3.

Question 5

When are Pitot 1 and 2, Pitot-Static 3, AOA 1 and 2, ADS Static Ports 1, 2, 3, and 4, and Pressurization Static Ports 1 and 2 heated?

Answer 5

Whenever at least one engine is running (N 2 above 56.4%)

AOM 2-15-10 page 13.

Question 6

When is an ice protection test required?

Answer 6

The test must be carried out once a day (not necessarily the first flight of the day) when icing conditions are forecast.

AOM 1-02-79 page 10.

Question 7

Explain how to perform an icing test A.

Answer 7

Thrust Levers…83%N 2

Ice Detection Override knob…ALL Anti-Icing Buttons (engine, wing and stabilizer)…PRESSED Ice Detection Test Knob…1, THEN 2 Thrust Levers…IDLE Ice Detection Override Knob…ENG or AUTO

AOM 1-02-79 page 10.

Question 8

How long should the Ice Detection Test Knob be held in the 1 and 2 positions?

Answer 8

At least 10 seconds in each test position, but no more than 15 seconds. AOM 1-02-79 page 10.

Question 9

If the Ice Protection Test method A is unsuccessful, what should be done?

Answer 9

The thrust levers should be set to IDLE and a second attempt performed, following the same procedures. AOM 1-02-79 page 10.

Question 10

What does the ENG position of the Ice Detection Override Knob do?

Answer 10

Turns on engine air inlet anti-icing for ground speeds below 25 kts. Above 25 kts, the wing and horizontal stabilizer anti-icing systems are also turned on if icing conditions are detected.

AOM 2-15-10 page 17.

Question 11

What happens if ice is detection by the ice detection system 1 or 2?

Answer 11

The bleed air 
•anti-icing system activates automatically 
•An SPS angle of attack set value
reduction 
•An advisory message on the EICAS 

AOM 2-15-15 page 1.

Question 12

What is the maximum altitude for operation with a single engine or single bleed in icing conditions?

Answer 12

15,000 ft.

AOM 1-01-50 page 1.