Ice And Rain Flashcards
What are the source of heat for thermal anti-icing systems
Bleed air, engine exhaust heat exchangers and combustion heaters
What prevents overheating of the leading edges of a thermal anti-ice system operated by engine bleed air
Overheat sensors signal the anti-icing valves to close and shut off the hot air
What happens to the hot air used by a thermal anti-ice system after it has heated the surface
Is dumped overboard
Why is it necessary to provide overheat protection for anti-icing systems that use turbine engine bleed air
Is hot enough to cause damage to the aircraft structure
Can the operation of an electrically heated pitot tube be checked with the aircrafts ammeter and if so how
Yes turn the pitot heater on and observe the deflection of the ammeter needle
Describe several potential problems associated with electrically heated windshields
Arcing, delamination, scratches, and discoloration
Why do some pneumatic deicer boot systems have an electrically operated timer
automatically cycle the boots, proper rest time, and recycle the boots
What are the two common methods of inflating pneumatic deicer boots
Bleed air or the exhaust driven vacuum pump
What procedure is used to hold deicer boots flat with the airfoil surface during flight
Suction is applied to the boots
Why do some deicer boots systems incorporate an oil separator
If a wet pump system is used the oil must be removed before it reaches the boots because the oil will damage the rubber
What methods are used to attach a deicer boot to the leading edges of the wing and tail surfaces
Adhesives, fairing strips, and screws
What important step should be taken prior to making a cold patch repair to a deicer boot
Consult manufactures service manual and follow repair instructions exactly how it says
Describe the methods commonly used to remove rain from a windshield
Windshield wipers, a blast of air, or chemical rain repellent
What power source are used to operate windshield wipers
Electrical or hydraulic power
Name two problems associated with in flight operation of aircraft windshield wipers
Insufficient blade pressure and blades don’t move fast enough
Describe the operation of a pneumatic rain removal system
A high velocity air blast prevents the rain from hitting the windshield
What are the effects of spraying rain repellent on a dry windshield
It smears and streaks, which reduces visibility, and it is hard to remove when dry
Where would you find information on the acceptable limits of windshield delamination
In reference material provided by manufacturer
What is used to clean deicer boots
A mild soap and water solution
What must be done before you can make a cold patch repair to a deicer boot
Deicer boot must be relieved from it’s installed tension before applying the patch
What component of a pneumatic deicer system normally allows suction to be supplied to the boots to hold them down in flight
Solenoid distributor valve
Describe the operating principle of thermal anti-icing systems
used for preventing ice from forming on the leading edge, also used to deice the leading edges by supplying really hot air for a short period of a time
What does arcing usually indicate in an electrical heated windshield
Indicates that there is a breakdown in the conductive coating
What is windshield delamination
Is the separation of the plies
What controls the temperature in a thermal anti-icing system
Hot and cold air mixed
What are the affects of arcing on an electrically heated windshield
Overheating and damage to the windshield
