DATA ITEM DESCRIPTION
Form Approved
OMB No. 0704-0188
Public reporting burden for collection of this information is estimated to average 110 hours per response, including the time for reviewing instructions, searching existing data sources, gathering and
maintaining the data needed and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information,
including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA
22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188), Washington, DC 20503.
1. TITLE
User’s Manual for Gas Turbine Engine Steady State and Transient
Performance Digital Computer Program
2. IDENTIFICATION NUMBER
DI-TMSS-81515
3. DESCRIPTION / PURPOSE
3.1 The user’s manual provides a detailed description of the characteristics and use of the engine steady state
and transient computer program (herein referred to as the model).
4. APPROVAL DATE
960715
5. OFFICE OF PRIMARY RESPONSIBILITY (OPR)
F/ASC-ENF
6a. DTIC APPLICABLE 6b. GIDEP APPLICABLE
7. APPLICATION / INTERRELATIONSHIP
7.1 This data item description (DID) contains the format and preparation instructions for data resulting from the
work task described by the Society of Automotive Engineers (SAE) Aerospace Standard 681 and SAE
Recommended Practice 755.
7.2 This DID is applicable to the acquisition of gas turbine engines. It may be applied in any acquisition phase
8. APPROVAL LIMITATION 9a. APPLICABLE FORMS 9b. AMSC NUMBER
F7191
10. PREPARATION INSTRUCTIONS
10.1 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 specified in the contract.
10.2 Format. Contractor format is acceptable.
10.3 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:
a. 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.
b. An identification of any limits on the values of input parameters.
c. Accurate graphic component performance maps of the fans, compressors, turbines, and exhaust nozzles
simulated in the model.
d. 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.
11. DISTRIBUTION STATEMENT
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
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