Brief Introduction [Propeller De-icing System]
On a C-130E/H aircraft, both anti-icing and de-icing system are used to control icing of the propeller spinner and blades. The difference between the two is:
Anti-icing is the applying of constant heat on a surface to prevent ice formation.
Deicing is the cycling of heat to remove ice that has fanned. Heating is accomplished by blankets which are heater elements made of crimped wire and stranded braid, which is molded into the fiberglass spinner. The leading edge of the blade fairing has heating blankets made with heater elements embedded in synthetic rubber, which is then bonded to the fairing surface of the blade root.
Deicer Contact Ring Holder Assembly
The deicer contact ring holder assembly is bolted on the aft end of the rear barrel half. The deicer contact ring holder assembly has four slip rings and four contact brush housing assemblies, a magnet, and magnet counterweights. Electrical power from the airplane electrical system is transmitted from a brush assembly on the control assembly through the slip rings to the spinner assembly anti-icing and deicing elements and to the contact brush housing assemblies. Each contact brush housing assembly touches contact rings on a blade to form an electrical circuit for the blade heater element. The magnet is part of a pulse generating device for the propeller synchrophasing system.
Minimum Score to Pass is 50%