Anti Ice/Rain Protection Systems

Question 1

Under what circumstances must Nacelle Anti Ice be selected ON on the ground?
(AOM Vol I, Ch SP)

Answer 1

• When the OAT is 10 degrees C or below and visible moisture is present.
• Where surface snow, ice standing water or slush are present.

Question 2

What are the engine run up procedures with Nacelle Anti Ice selected ON?
(AOM Vol I, Ch SP)

Answer 2

• 60% N1, for 30 seconds every 30 minutes, and

* For 30 seconds just prior to the start of the takeoff roll.

Question 3

When is anti-fogging available to the windows?

AOM Vol II, Ch 3

Answer 3

• When AC electrical power is supplied to the aircraft

Question 4

How do you reset a windshield heat controller fault?

AOM Vol II, Ch 3

Answer 4

• Window heat switch off for 10 seconds, then on.

Question 5

When are the TAT probes heated?

AOM Vol II, Ch 3

Answer 5

• In flight.

Question 6

If heavy rain or hail are encountered in descent, what is required?
(AOM Vol I, Ch SP)

Answer 6

• Continuous Ignition Switch to on.

* Autothrottles disconnect.

Question 7

What is required if operation is conducted in moderate to severe icing conditions for prolonged periods with the N1 less than 70%?
(AOM Vol I, Ch SP)

Answer 7

• Increase thrust on one engine at a time to a minimum of 70% N1 for 10 to 30 seconds every 10 minutes.

Question 8

What does the careted EICAS message “>ICING NAC” mean? (QRH, Ch 3)

Answer 8

• Any nacelle or wing anti ice system is on and the TAT is greater than 12 degrees C, or the Ice Detector does not detect ice.

Question 9

On descent into Delhi with convective activity in all quadrants, what steps must be taken to improve engine flameout margins with TAT below 10 degrees C?
(AOM Vol I, Ch SP)

Answer 9

• Pack Hi Flow Switch to ON.
• Nacelle Anti Ice Switches ON.
• Below 22,000 feet, Wing Anti Ice Switch ON.