Test cell correlation is the recommended method used to demonstrate that a test cell is operating correctly and producing engine performance data that matches the reference test cell data within an acceptable tolerance. Test cell correlation factors, which may be determined to be necessary based on the results of correlation testing. The newly correlated test cell provides a means to ensure that overhauled engines meet minimum rated requirements.

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​This process is required and guided by 14 CFR 43.2(a) Records of overhaul and rebuilding. Test Cell Correlation is covered under the broad statement "it has been tested in accordance with approved standards and technical data."