CS-E 740 Endurance Tests
Source document: Easy Access Rules for CS-E Amendment 5
CS-E 740 Endurance Tests
Summary
The oil must not deteriorate or adversely affect systems using it. Significant vibrations require specific endurance testing with varied rotational speeds. After testing, engines undergo strip inspections to ensure safe operation. Engines may show deterioration post-testing, but structural integrity must be verified through inspection or analysis.
Related Questions
If the Engine is to be subjected to a strip examination before the additional endurance test, it must be reassembled using the same parts that were used during the 150 hours test run, except for those parts described as consumable in the Engine documentation. This ensures that the Engine is reassembled with components that have been previously validated for performance.
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Engines with 30-Second and 2-Minute OEI Power ratings must undergo a full strip inspection after completing the additional endurance test as specified in CS-E 740(c)(3)(iii). This ensures that the Engine is thoroughly checked for any issues that may have arisen during the test.
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If the Engine was not subject to a strip examination before commencing the additional endurance test, the strip inspection specifications of CS-E 740(h)(1) must be applied upon completion of the test. This ensures that the Engine is properly inspected and assessed for any deterioration.
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If significant vibration response is found on relevant components while establishing compliance with CS-E 650, not less than 10 hours and not exceeding 50% of the incremental periods of Part 4 of the endurance test must be run with the rotational speed varied continuously over the range where the largest amplitude vibrations were disclosed. If there are other ranges of rotational speed with similar amplitudes, an additional 10 hours must be run for each such range.
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After completing the endurance test, the Engine must undergo a strip inspection. The dimensions measured in accordance with CS-E 740(b)(5) must be re-measured and recorded. The condition of the Engine must be satisfactory for safe continued operation, and separately functioning Engine components and equipment must be functionally checked prior to the strip inspection to ensure that any changes in function or settings are satisfactory for normal operation.
* Aviation.Bot's Suggestion - Always consult the original regulation for confirmation
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