![]() This provides a stabilizing effect on the current that is passing through the tube. Resistance in the iron filament increases with temperature increase (caused by current flow). Each tube is made up of a pure iron filament surrounded by helium and hydrogen gases and enclosed in a glass envelope. ![]() The ignition current regulator contains four ballast tubes. The glow plug system consists of an ignition current regulator with a selectable circuit to the two sets of tubes, two shielded cables, and two glow plugs. Anyway, on to the subject at hand - PT6 ignition systems. In addition, we couldn’t tackle an article like this without reference to Pratt & Whitney Canada’s (P&WC) maintenance manuals and training manuals. Any information you find valuable in this article, you can thank Ralph for. Ralph is very knowledgeable about PT6 engines, and was able to share his knowledge with us. I began my research on this subject matter by contacting Ralph Hawkins, Chief Engineer for Northstar Turbines, LLC. ![]() We will discuss both systems and share some tips on proper inspection and maintenance of these components. There are two types of ignition systems that are used in the engine, glow plugs, and spark igniters. An important component of the engine is the ignition system. The Pratt & Whitney PT6 is a widely used turbine engine in the aviation market.
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