DATA ITEM DESCRIPTION
Title: User’s Manual for Gas Turbine Engine Steady State and Transient Performance Digital
Computer Program
Number: DI-TMSS-81515A Approval Date: 20070927
ASMC Number: F9018 Limitation: N/A
DTIC Applicable: N/A GIDEP Applicable: N/A
Office of Primary Responsibility: 11 (ASC-ENF)
Applicable Forms: N/A
Use/relationship: This Data Item Description (DID)
provides the method for presentation of
gas turbine engine steady-state and transient performance calculated using digital computer
programs. It also provides for the presentation of parametric gas turbine data including
performance, weight and dimensions computed by digital computer programs. The
information is intended to facilitate calculations by the program user without unduly
restricting the method of calculation used by the program supplier.
a. This DID contains the format, content and intend use information for the data resulting from
the work task described in the Society of Automotive Engineers (SAE) Aerospace Standard 681
and SAE Recommended Practice 755.
b. DI-TMSS-81515A supersedes DI-TMSS-81515.
Requirements:
1. Reference Documents. The applicable issue of the documents cited herein, including
their approval dates and dates of any applicable amendments, notices, and revisions, shall
be as cited in the contract.
2. Format. Contractor format is acceptable.
3. Content. The User’s Manual shall contain the information required by SAE Aerospace
Standard 681. In addition, the User’s Manual shall contain the following:
3.1. A detailed explanation of the performance calculation process for each engine
component, including an index of all subroutines in the model including explanations of their
purpose, and identification of the function of each programming variable and array element,
detailed explanations of the derivations of all empirical functions used in the model, and the
rationale for all reference values used for normalized parameters.
3.2. An identification of any limits on the values of input parameters.
3.3. Accurate graphic component performance maps of the fans, compressors, turbines,
and exhaust nozzles simulated in the model.
3.4. A detailed description of the major engine control loops, the hierarchy of the loops, the
control limits, and graphs of all engine control schedules represented in the model.
4. End of DI-TMSS-81515.
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