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The Turbine Engine Testing Working Group (TETWoG) is a focus group of the American Institute of Aeronautics and Astronautics (AIAA) Ground Testing Technical Committee (GTTC). The GTTC scope is “The test evaluation of vehicles, structures, and aerospace systems, subsystems, and components in ground- based facilities such as wind tunnels, environmental facilities, and engine test facilities.”

PURPOSE
TETWoG provides a forum for the informal exchange of knowledge and information to improve mutual understanding between organizations and individuals working in the field of aircraft turbine propulsion system test and evaluation. Organized in 1968, the group’s activities focus on ground-based and simulated flight testing of turbine aircraft propulsion systems for performance and reliability, including prototype, development, qualification, and certification testing.

TETWoG members represent aircraft and propulsion engine manufacturers, test cell design and fabrication companies, aerospace suppliers, and engine test facilities from all over the world. The biannual meetings are an opportunity for members to share testing activities/developments and discuss techniques related to testing, instrumentation, measuring systems, analysis methods, and specific engine/hardware systems related to propulsion system performance and reliability evaluation.

Title
Turbine Engine Testing Working Group Charter of the Ground testing Technical Committee, American Institute of Aeronautics and Astronautics

Purpose
The Working Group of Aircraft Turbine Engine Testing is established to provide a forum for the informal exchange of knowledge and information to complement and improve the mutual understanding between organizations and individuals working in the field of aircraft turbine propulsion system test and evaluation.

Scope
Activities of the Working Group shall relate directly to the ground and simulated flight testing of turbine aircraft propulsion systems for both performance and reliability evaluations, and include prototype, development, qualification, and certification. These activities shall be correlated with test criteria and techniques applicable to flight testing requirements. Specifically, the Working Group shall be concerned with testing techniques, instrumentation, measuring systems and techniques, instrumentation, analysis methods and techniques, and specific engine/hardware systems related to the propulsion system performance or reliability evaluation, and which influence the test article performance and reliability.

Membership
Any company, corporation, research or test center, or agency (private or government) involved in test or evaluation of aircraft turbine propulsion systems is eligible to nominate members to participate in the Working Group. Members should possess a detailed familiarity with both the requirement for turbine propulsion system evaluation and the techniques, systems, analysis procedures, methodology, and general concepts for turbine propulsion system performance and reliability testing and evaluation. All members of the Working Group shall be AIAA members.

CHARTER AMENDMENT
Amendment to the Ground Test Technical Committee Charter for the inclusion of Focus Groups

Purpose
Focus Groups are organizations that operate essentially independently from the Ground Test Technical Committee (GTTC), but were organized under and have been sponsored by the GTTC. The primary function of the Focus Groups is the sharing of information on a specific topic within the ground test community. These groups (such as the Space Simulation Working Group and the Turbine Engine Test Working Group) provide an important service to ground testing in their specific areas by allowing the free exchange of ideas, lessons learned and technical knowledge between ground test facility owners/operators, test engineers and customers. Operation The Focus Groups will work independently of the GTTC in most all regards. There is no requirement of shared membership (although this is allowed and encouraged) nor do the Focus Groups have to co-locate meetings with the GTTC (although, this is also allowed). The Focus Groups will have their own charters that define the scope, membership, objectives, operation, etc. The Focus Group charter must be approved by the GTTC. While details as to operation may vary, the Focus Groups generally meet two times per year at a member organizations site (this allows for facility tours) and share information in the form of presentations and/or informal papers. This information is generally kept within the Focus Group membership, but may also be made available to the GTTC membership. Communication between the GTTC and the Focus Groups will be through specific liaisons. The Focus Groups are required to provide an annual written report to the GTTC through the designated liaison. These reports will be included in the GTTC meeting minutes. Representatives from the Focus Groups are welcome to attend the GTTC meetings, however, unless there are issues requiring a TC vote, no presentations will be allowed at these meetings (per current operation of the GTTC). Written reports will include Focus Group officers and membership list, meetings held, the location of the meetings and a summary of events. The Focus Group may be called on to support GTTC activities, such as conference sessions and working groups. If a Focus Group wants to produce a formal deliverable, like a standard, recommended practice or white paper, a formal working group can be established under the GTTC or the work can be completed by the Focus Group. Approval of any deliverable must be granted by the GTTC.

Formation of a new Focus Group is similar to the formation of a GTTC Working Group. After a need for the group is established and a core membership is set, a charter must be drafted and presented to the GTTC for consideration. The GTTC membership will then vote whether or not to sponsor the Focus Group. Sponsorship of each Focus Group will be reviewed by the GTTC every four years, or sooner if the need arises. If the GTTC determines that the Focus Group is not following its charter, or is not providing a positive contribution to the ground test community, the Focus Group may be dropped from the GTTC.

Steering Committee
The TETWoG Focus Group is run by a steering committee. The committee includes three officers, three at-large members, the chair emeritus and at permanent members.

Steering Committee Roles
The chair’s primary duties are keeping the group calendar and host of steering committee meetings. The vice-chair's primary duty is to liaison with the collocated SAE EG-1E & EG-1A groups as well as to step into any other role as needed in the case of absence of another officer. The secretary is tasked with communication, membership, and group minutes. The secretary maintains the TETWoG mailing list, comprising of previous attendees and any other interested person working in the field.

The three at-large members include one designated as lead, one each from North America and one from Europe whose primary duties are regional recruitment of members as well as vetting potential future meeting locations.

The previous chair becomes the chair emeritus. Former chairs are eligible to be named as permanent members of the steering committee. There shall be a minimum of two permanent members.

Steering Committee Selection Process
There are no elections in the group. Steering committee members are promoted every two years or in the case of a vacancy from Lead At-Large through Secretary, Vice-chair, Chair, and Chair Emeritus. The steering committee accepts nominations/recommendations and chooses the new at-large members. The normal selection of a lead at-large is from an existing at-large member.

Steering Committee Membership
As of 2023 the steering committee is comprised of the following members:

Meetings
The group has four types of meetings. The technical meeting is the large scale meeting open to all attendees, registration is required. The officers meet in quarterly steering committee meeting 90 days in advance of technical sessions, as well as meetings the day prior to technical sessions and in the midst of technical sessions as described below.

Technical Meeting
Technical meetings are to be chaired by a session chair. The primary focus of the meeting is attendee presentations. Technical meetings are held twice per year, typically occurring in the third week of October and second week of May, though the actual date may vary due to considerations of the host site. Meetings are co-located with the SAE EG1E and now conform to the SAE preference of having at least one meeting in four outside of US/Canada. The meeting is open to any registered attendee.

Quarterly Steering Committee Meeting
Quarterly meetings are led by the chair. The primary focus of the meeting is to discuss and finalize logistical details of the subsequent technical meeting including meeting registration, agenda, call for presentations. The meeting may also discuss any other business of the TETWoG committee as needed.

The invitees for this meeting include the steering committee plus the upcoming technical meeting's session chair. Steering committee meetings are normally held virtually 90 days in advance of technical meetings.

Steering Committee Pre-Meeting
The pre-meeting is led by the chair. The focus of this meeting is to approve the final agenda, make a final determination of future meeting locations. The invitees for this meeting include the steering committee and current session chair. The pre-meeting is normally held in person Monday night at technical meeting hotel common area in advance of technical sessions, including both TETWoG and the collocated SAE EG-1E.

Steering Committee General Meeting
General meeting is led by the chair. The focus of this meeting is an open discussion on future site nominations. Potential sites can be assigned an steering committee member to make contact an evaluate. This meeting is an open meeting which any TETWoG or SAE EG1E member can attend. The steering committe and the SAE EG1E officers are invited. The general meeting is normally held in person mid-week at the technical meeting hotel common area.

Site Selection Process
Potential sites are nominated to leadership a the steering committee general meeting. The chair will assign an at-large officer to evaluate site. It is expected the nominee will introduce the assigned at-large officer to the site's point of contact.

The assigned at-large officer to prepare report on the site including the openness to hosting the meetings, site availability, calendar restrictions, ability to meet meeting host requirements. Considerations include


 * Potential hotel accommodations, government rate availability
 * Site security/registration requirements for visitors or foreign nationals
 * Site security requirements for visitor computers
 * Site tour requirements including safety glasses, steel toe shoes

Site nominee will be typically be drafted to serve as session chair