Designing a helicopter intake protection system is a complex process that requires significant knowledge and experience. Every Centrisep EAPS design is tailored to a specific helicopter model. Pall’s design and engineering expertise ensures that optimum performance is achieved in the smallest envelope with the lowest weight possible. The designs are developed using sophisticated CATIA1 3-D modelling and simulation software. The steps include:
The specifications will include:
Performance analysis is conducted, including the compressor entry plane because the Centrisep EAPS (and Inlet Barrier Filters) can interact with the downstream ducting. Depending on the specific design, the Pall parts kit can include or exclude the downstream duct.
After a series of reviews, the final design is agreed upon. Every helicopter model is unique, therefore significant engineering knowledge and experience are required for each design.
To achieve the optimum performance, several tools are used:
A prototype unit (or a rapid prototype model) will be produced to verify the following:
After the prototype evaluation is completed, design improvements are identified and incorporated.
The next stage is testing.
Before a Centrisep EAPS can be installed onto a helicopter, the unit must undergo a comprehensive suite of qualification (performance and environmental) tests, followed by flight testing.
Performance testing - To ensure that the Centrisep EAPS meets OEM and/or customer specifications, engineers conduct extensive testing in Pall’s own laboratory facilities. Pall scientists and technicians perform air filter and qualification testing using the following:
The following tests are performed:
Environmental testing - Vibration, shock, acceleration, icing, EMC and bird strike testing are normally conducted at approved, independent test facilities.
For a Centrisep EAPS design, a Pall engineer can prepare an icing certification report which predicts the design performance. The report is created using results from previous icing tests, as well as Computational Fluid Dynamic (CFD) Simulation. These reports have been widely accepted by the airworthiness authorities. As a result, laboratory or natural icing tests may not be required. Contact firstname.lastname@example.org for an icing report for your particular helicopter.
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.
Bird strike – The Centrisep EAPS has been qualified to meet the bird strike requirements of both FAR 29 (airframe) and FAR 33 (engines). When combined with a mesh screen, the unit provides excellent protection against foreign object impact and does not become clogged with debris.
After the qualification (ground) testing is complete, the Centrisep unit can be installed on the helicopter for flight testing. The aim is to confirm the effects of the Centrisep EAPS on the helicopter’s performance and handling characteristics.
The flight test program is carried out on a fully instrumented helicopter and can include: