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AIRFRAME 15

Ice & Rain Control Systems

QuestionAnswer
What are two methods of inflating pneumatic deicer boots? An engine-driven vacuum pump and bleed air from a turbine-engine compressor
How are deicer boots attached to the leading edges of wing and tail surfaces? Bonding, fairing strips and screws, or a combination of both
What is the function of the oil separator used in some deicer boot systems? In a wet-type air pump, it is used to remove entrained oil from output air before it is sent through the boot system
What must be accomplished to a deicer boot prior to a cold patch repair? Relieve the installed tension
What normally keeps deicer boots held down in flight? Suction is supplied to the boots during flight
What methods are used to supply heat for thermal anti-icing system? Turbine compressor hot air, engine exhaust heat exchangers, and ram air heated by a combustion heater
How is the temperature maintained in a thermal anti-icing system? By mixing heated air with ambient (cold) air
What happens to the thermal anti-icing airflow after it has heated a leading edge surface? The airflow is exhausted to the atmosphere
How can an electrically heated pitot tube with an ammeter installed in the system be checked for operation? It can be verified by noting the current consumption when the heater is turned on
Name at least two methods used to remove rain from a windshield Wipers, pneumatic (jet blast), chemical rain repellent, and windshields treated with hydrophobic surface seal coating
What powers windshield wiper systems? Electrical or hydraulic power
What are the two inherent problems associated with windshield wipers when operated in flight? Aerodynamic forces reduce blade pressure; and failure to achieve fast enough wiper oscillations
How does a pneumatic rain removal system work? The air blast breaks the rain drops into small particles that are then blown away
Why is a windshield rain repellent system not operated when the windshield is dry? Heavy undiluted repellent will restrict window visibility
What is the purpose of the electronic timer in a pneumatic deicer boot system? It controls the operation sequence and time intervals
Created by: Chisum
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