Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology

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56 Military Jet Engine Acquisition DATA GATHERING Gathering data is one of the major activities of any statistical analy- sis. We were fortunate that NAVAIR’s Cost Department has main- tained a database of aircraft engine production and development costs. These data formed the basis for our analysis. The following list summarizes the fields for the basic information, performance, tech- nical risk, programmatic, and production costs parameters in the engine database we developed for our study. Basic Information • Engine model designation • Aircraft • Military service • Afterburning engine (yes or no) Performance • Maximum thrust with afterburner, sea-level standard • Thrust at intermediate rating point (IRP), sea-level standard • Specific fuel consumption at IRP, sea-level standard • Air flow rate at IRP, sea-level standard • Overall pressure ratio at IRP, sea-level standard • Rotor inlet temperature (maximum rated) • Dry weight • Thrust-to-weight ratio (based on maximum thrust including afterburner) • Hours of hot section life • Hours of cold section life Technical Risk • Technical change scale (see Table 5.2)

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