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Performance deterioration based on in-service engine data: JT9D jet engine diagnostics programResults of analyses of engine performance deterioration trends and levels with respect to service usage are presented. Thirty-two JT9D-7A engines were selected for this purpose. The selection of this engine fleet provided the opportunity of obtaining engine performance data starting before the first flight through initial service such that the trend and levels of engine deterioration related to both short and long term deterioration could be more carefully defined. The performance data collected and analyzed included in-flight, on wing (ground), and test stand prerepair and postrepair performance calibrations with expanded instrumentation where feasible. The results of the analyses of these data were used to: (1) close gaps in previously obtained historical data as well as augment the historical data with more carefully obtained data; (2) refine preliminary models of performance deterioration with respect to usage; (3) establish an understanding of the relationships between ground and altitude performance deterioration trends; (4) refine preliminary recommendations concerning means to reduce and control deterioration; and (5) identify areas where additional effort is required to develop an understanding of complex deterioration issues.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Sallee, G. P.
(Pratt and Whitney Aircraft Group East Hartford, CT, United States)
Date Acquired
September 4, 2013
Publication Date
April 27, 1979
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
Accession Number
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.
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