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  • Question

    Do you feel the proposed change to the drawing allowing a small change in rivet length should be a Class I or Class II ECP? I'm trying to comply with the ECP Instructions for Block 5 of the ECP "Class of ECP".


    Answer

    Here is the text from AR 750-10:

     

    3–2. Engineering change proposals

     

    a. ECPs document proposed changes in the requirements or design of an item, provide a mechanism for coordinating the proposed changes, and provide a way to disseminate changes upon approval. The ECP process is documented in military handbook (MIL–HDBK)-61A(SE), and the format for an ECP is in American National Standards Institute (ANSI)/Electronic Industries Alliance (EIA)-649–B. If there is a need or the decision is made to apply the ECP to fielded equipment, the ECP must be developed into a MWO for hardware/software application to fielded items or into a SCP for a software-only application.

     

    b. There are two types of ECPs, as referenced in ANSI/EIA–649–B and MIL–HDBK–61A(SE). They are—

     

    (1) Class I engineering change proposal. A Class I ECP is approved by the configuration control board (CCB) and authorized with a contract modification. Class I ECPs are assigned an engineering change priority (emergency, urgent, or routine), which determines the relative speed at which the ECP is to be reviewed, evaluated, and, if approved, ordered, and implemented.

     

    (2) Class II engineering change proposal. A Class II ECP is typically reviewed for concurrence in classification and approved by the MATDEV, unless otherwise specified in the contract.

     

    c. MWOs are based on Class I ECPs, which affect form, fit, and function, and have associated costs. Class II ECPs do not require the generation of a MWO.

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    The IPT will have to decide if this change of the part number could possibly impact Form, Fit, or Function (FFF).

     

    A simple change to a part dash number may not be considered a major or Class 1 change if it does not affect the performance or FFF of the component as a part of the design. If by going up or down 1 dash number on the rivet allows a longer or shorter length, an engineering investigation should be conducted to determine if the new range in rivet length causes any design problems. E.g., does a shorter rivet pull out of the whole easier? Does a longer rivet cause a clearance problem? If, after an investigation, it is determined that the change will not cause a design problem and no changes are require to the Production Baseline, i.e., no changes to drawings , then probably it could be classified as a Class 2 change. If the change does require other changes to the design, then it should be classified as a Class 1. In the final analysis, the determination is up to whoever chairs the Configuration Control Board. This decision should not be delegated to DCMA.

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