The Centrisep engine advanced protection system (EAPS) offers the ultimate in helicopter engine protection.
For decades, the Centrisep EAPS, also known as a ‘sand filter,’ has proven very effective in extreme sand and dust conditions.
Designing helicopter engine protection systems is a complex process that requires considerable expertise. Pall engineers provide design and testing services to deliver cost-effective engine protection for a wide range of helicopter applications on thousands of helicopters around the globe.
The system is extremely effective in sand, dust and brownout conditions. In a laboratory test at MTU Aero Engines, a Centrisep EAPS was challenged with 156Kg of dust. This is equivalent to 10 (ten) hours in brownout conditions. The Centrisep EAPS stopped virtually all of the contamination from entering the engine, and operated continuously throughout the duration of the test. In contrast, an oil-wetted inlet barrier filter (IBF) would have required cleaning 300 times and replacement at least 20 times during the equivalent test period. This means the test would have stopped every two minutes for barrier filter maintenance.
For decades, the Centrisep EAPS has proved invaluable to commercial and military operators around the world flying in severe operating environments.
Each design can be certified for inadvertent entry into icing conditions. Some models have undergone winter trials and have subsequently been qualified for all-weather operation.
The Centrisep EAPS does not become blocked and therefore has no requirement for a bypass system and warning lights. In contrast, oil-wetted IBFs require bypass systems. This increases the complexity of the design, adds additional inspection and maintenance costs, and can increase the pilot’s workload. A bypass door can also collect foreign objects, sand, ice, etc., which may go straight into the engine intake when the door is opened.
Pall’s latest Centrisep EAPS designs have excellent sand and dust removal efficiency. A particulate removal efficiency of greater than 96% (ISO Coarse Test Dust) by mass will provide an increase in engine erosion life of over 20 times.
Field experience, including trials in the Paris-Dakar rally, has shown that this level of removal efficiency is more than adequate to protect the engine from erosion damage and to meet the required time between overhaul (TBO.)