Af Airframe Ice &rain Control

Front 1

What controls the temperature in a thermal anti-icing system

Back 1

Hot and cold air are mixed

Front 2

What are the sources of heat for thermal anti-icing systems

Back 2

1. Bleed air from the compressor section of a turbine
2. engine exhaust heat exchanger
3. combustion heaters

Front 3

What prevents overheating of the leading edges of a thermal anti-Icing system operated by engine bleed air

Back 3

Overheat sensors signal the anti-icing valves to close and shut off the hot air

Front 4

What happens to the hot air used by a thermal anti-ice system after it has heated the surface

Back 4

The air is dumped overboard

Front 5

Why is it necessary to provide overheat protection for anti-icing system that use turbine engine bleed air

Back 5

That air is hot enough to cause damage to the aircraft structure

Front 6

What are the effects of arcing on electrically heated windshield

Back 6

Localized overheating and damage to the windshield

Front 7

Can the operation of an electrically heated pitot tube be checked with the aircraft ammeter, and if so, how

Back 7

Yes, turn the Pitot heater on and observe the deflection of that ammeter needle

Front 8

Describe several potential problems associated with electrically heated windshield

Back 8

1. Arcing
2. Delamination
3. Scratches
4. Discoloration

Front 9

Why do some pneumatic deicer boot systems have an electrically operated timer

Back 9

1. To automatically cycle the boots
2. provide the proper rest time
3. then recycle the boots

Front 10

What are the two common methods of inflating pneumatic deicer boots

Back 10

1. Bleed air from a turbine engine
2. the exhaust from an engine driven vacuum pump

Front 11

What procedure is used to hold deicer boots flat with the airfoil surface during flight

Back 11

Suction is applied to the boots

Front 12

Why do some deicer boot systems incorporate an oil seperator

Back 12

If a wet pump system is used, the oil must be removed before it reaches the boots because oil damages the rubber

Front 13

What methods are used to attach a deicer boot to the leading edges of the wing and Tail surfaces

Back 13

1. Adhesives
2. fairing strips and screws
3. a combination of both

Front 14

What important step should be taken prior to making a cold patch repair to a deicer boot

Back 14

Consult the manufacturers service manual and follow the repair instructions explicitly

Front 15

Describe the methods commonly used to remove rain from a windshield

Back 15

1. Windshield wipers
2. a blast of air
3. chemical rain repellent

Front 16

What power sources are used to operate windshield wipers

Back 16

Electricity or hydraulic pressure

Front 17

Name two problems associated with in-flight operation of aircraft windshield wipers

Back 17

1. Insufficient blade pressure caused by aerodynamic forces
2. Failure to oscillate fast enough

Front 18

Describe the operation of a pneumatic rain removal system

Back 18

A high velocity airblast prevents the rain from reaching the surface of the windshield

Front 19

What are the effects of spraying rain repellent on a dry windshield

Back 19

It's smears and streaks,which reduces visibility, and is hard to remove when dry

Front 20

Where would you find information on the acceptable limits of windshield delamination

Back 20

In reference material provided by the manufacturer