| Sampling Practice Recommendations |
| aviation |
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| Category | Component | Test Kit | Interval | Comments |
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| Engines | Piston Aircraft | AVI 1 | 50 hr | AVI 1 kit for routine analysis. |
| | Jet Turbine | AVI 3 | 150 hr | Test kit includes ferrography to monitor rapid failure modes (e.g. rolling element bearings). For filters with a micron rating of 10 µm (absolute) or less, AVI 2 kits may also be used, and are recommended for 5 µm filter sizes or less. |
| | Turboprop | AVI 3 | 150 hr | " |
| | Helicopter Engines | AVI 3 | 150 hr | " |
| | Garrett 331 | GT-331 | 100 hr | Honeywell certified test analysis for Garrett TPE-331 turboprop engines. |
| | Garrett 731 | GT-731 | 150 hr | Honeywell certified test analysis for Garrett TPE-731 turbofan engines. |
| | Garrett APU | GT-APU | 100 hr | Honeywell certified test analysis for Garrett Auxiliary Power Units. |
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| Gears | Gearbox | AVI 3 | 150 hr | Test kit includes ferrography to monitor rapid failure modes (e.g. rolling element bearings). For filters with a micron rating of 10 µm (absolute) or less, AVI 2 kits may also be used, and are recommended for 5 µm filter sizes or less. |
| | Transmission | AVI 3 | 150 hr | " |
| | Rotor | AVI 3 | 150 hr | " |
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| Hydraulics | Hydraulic system | IND 2 | 150 hr | IND 2 kit includes particle counting to monitor fluid cleanliness levels (NAS code). |
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| Special Sampling Considerations |
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| Follow up on abnormal samples | AVI 3 | WearCheck advises that ferrographic analysis be performed with resamples on equipment that tested abnormal. Filter analysis allows the diagnostician to locate and detect major wear situations. Filter analysis can be performed on any equipment that has a replaceable filter. |
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| Engines with ultra-fine filtration | AVI 2 | For aircraft engines with ultra-fine filtration (3 µm absolute or less), filter analysis will provide a more comprehensive analysis program. The abnormal wear particles that would normally show up with analytical ferrography are trapped in the filter membrane. Filter analysis will detect these particles. |
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