Shared Flashcard Set

Details

Ice and Rain Control Systems-DME Oral
Airframe ASA 20 Questions
20
Aviation
Undergraduate 1
09/06/2015

Additional Aviation Flashcards

 


 

Cards

Term
What prevents overheating of the wing leading edge skin in a thermal anti-ice system that is operated by engine bleed air?
Definition
A thermal switch will cause a valve to close and shut off the flow of bleed air when the temperature of the skin reaches a predetermined value
Term
What methods are used to supply heat for thermal anti-icing systems?
Definition
Turbine compressor bleed air, engine exhaust heat exchangers and ram air heated by a combustion heater
Term
What must be accomplished to a deicer boot prior to a cold patch repair?
Definition
Relieve the installed tension
Term
How are deicer boots attached to leading edges of wing and tail surfaces?
Definition
Fairing strips and screws or cemented
Term
What are two methods of inflating pneumatic deicer boots?
Definition

Engine-driven vacuum pump and turbine compressor bleed air

Term
What is the function of the air/oil separator used in some deicer boot systems?
Definition
It is used to remove oil from the pressurized air in a wet-type vacuum pump system
Term
What normally keeps deicer boots held down in flight?
Definition
Suction
Term
How is the temperature maintained in a thermal anti-icing system?
Definition
By mixing bleed air and ambient air
Term
What is the purpose of the electronic timer in a pneumatic deicer boot system?
Definition
It controls the operating sequence and time intervals
Term
How does a pneumatic rain removal system work?
Definition
The air blast forms a barrier that prevents raindrops from striking the windshield's surface
Term
Why is a windshield rain repellent system not operated when the windshield is dry?
Definition
Heavy undiluted repellent will restrict window visibility
Term
What methods are used to remove rain from a windshields?
Definition
A chemical rain repellent, wiping or blowing off
Term
What are the two inherent problems associated with windshield wipers, when operated in flight?
Definition
Aerodynamic forces reduce blade pressure and failure to achieve fast enough wiper oscillations
Term
What are the effects of electric windshield arcing?
Definition
Local overheating and damage of windshield
Term
What are several problems associated with electrically-heated windshields?
Definition

Delamination, discoloration, scratches and arcing

Term
What happens to the thermal anti-icing airflow after it has heated a leading edge surface?
Definition
The airflow is exhausted to the atmosphere
Term
Why are anti-icing systems using turbine-engine bleed air provided with an overheat system?
Definition
To prevent aircraft structure damage
Term
When is windshield delamination acceptable?
Definition
When within limits established by manufacturer and it is not in an area where it affects the optical qualities of the windshield panel
Term
How can an electrically-heated pitot tube with an ammeter installed in the system be checked for operation?
Definition
Verified by noting the current consumption when the heater is turned on
Term
What powers windshield wiper systems?
Definition
Electrical or hydraulic power
Supporting users have an ad free experience!