Trend Analysis for Maintaining Correlation of Gas Turbine Engine Test Cells

Scope:

This document describes a recommended practice and procedure for the trending of parameters to maintain the test cell correlation status. Trending is performed to monitor test cells for changes that can affect engine performance or the data acquired from engine tests.

Rationale:

The FAA has issued Advisory Circular, AC43-207, on December 26, 2002 that recommends a 7-year re-correlation, trending or periodic checks. The FAA, AC43-207 bases their recommendation on the SAE Aerospace Recommended Practice (ARP) 741.

This document describes a recommended practice and procedure for the trending of parameters to maintain the test cell correlation status as well as for documenting the trend analysis results. Trending is performed to monitor test cells for changes that can affect engine performance or the data acquired from engine tests. Over time the quality of the acceptance test data for an engine can be affected by the test cell environment. This could lead to unanticipated and expensive results of either accepting a poor performing engine or rejecting a good performing engine. The use of trending the data for engine acceptance can avoid such costly errors.

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