The Vulcain II rocket engine built by Snecma powers the first stage of the Ariane 5 launcher. This engine is started with three products of APP. The first product is the Thrust Chamber Igniter (TCI) that ignites the main combustion chamber of the engine. The second product is the Gas Generator Igniter (GGI), igniting the gas generator that supplies a hot gas flow for driving the turbine pumps. The last product is the Turbine Pump Starter (TPS), providing a high mass flow of hot gas to increase the rotational speed of the turbine pump at engine start.
The igniters are based on pyrogen technology and contain composite solid propellant grains. The unique compositions of the propellants are based on ammonium nitrate and therefore chlorine free combustion products are obtained.