2 - Vortex Tubes
- Inspect the panel for missing, damaged or loose vortex tubes.
- If the assembly is fitted with white vortex tubes this is an old manufacturing standard and the panel should be replaced.
3a - Scavenge Fan System
- Check the fan is working correctly and that there is no evidence of erosion damage upon the fan housing or the fan stator vanes.
- Use an impeller wear gauge to inspect fan stator vanes. The part number (P/N) for the wear gauge tool will vary depending on the fan model. The P/N and wear limits will be listed in the component maintenance manual or can be advised by Pall Aerospace.
3b - Ejector System
- Check for damage or blockage.
- Check there are no restrictions to the air flow particulate.
- Inspect the system for mechanical integrity and for signs of erosion of the primary ejector nozzle or damage to the ejector tube.
- If fitted, check that the bleed air valve is functioning correctly.
4 - Seals
- The seals should be free of cracks, rips, gouges, and missing sections.
- If necessary, remove the damaged seal and replace with a new seal. Some Centrisep assemblies have a matching seal kit that can be obtained by ordering the correct part number.
- Inspect the interface between the Centrisep EAPS and the cowling to ensure that there is no possible leakage path. If there are any visible air spaces in the interface, the operator should take immediate and appropriate action to rectify this condition.
Note: Any leakage in interface seals between the air intake filter system and the engine can significantly reduce the effective dust removal efficiency.
Vortex Tube Repairs
The only repair scheme that can be carried out by the operator is to replace missing, displaced, or damaged inlet and outlet tubes.
Inlet tube repair scheme - The damaged tubes are replaced with special repair tubes which are installed from the inlet side of the panel.
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Outlet tube repair scheme - In the unlikely event that you need to repair the outlet tubes, please contact email@example.com. The engineering design team will be able to advise you on the correct P/N and repair instructions for your helicopter model.
- Up to 10% of the tubes in a Centrisep EAPS panel can be replaced following this procedure. However, if all the tubes to be replaced are all in the same area, this figure drops to 5%. Above these values, the Centrisep EAPS must be returned to Pall for complete overhaul.
- Parts beginning with ‘QB’ are manufactured by Pall Aerospace Europe. These units should be repaired using the inlet tube repair kit P/N QR10311 or QR10616. The part number depends on the helicopter type and the age of the Centrisep unit.
- Parts beginning ‘CE’ or ‘AE’ are manufactured by Pall Aerospace Company (USA). These units should be repaired using the inlet tube repair kit P/N AC 8101-1008KT.