The Production Part Approval Process (PPAP) defines generic requirements for production part approval, including production and bulk materials. The purpose of PPAP is to determine if all Westport Fuel Systems engineering design record and specification requirements are properly understood by the supplier and that the manufacturing process has the potential to produce product consistently meeting these requirements during an actual production run at the quoted production rate.
All documents must be submitted in Westport Fuel Systems accepted format. Download the PPAP Checklist. Click the steps below for a detailed explanation. Associated templates are listed below each step.
This record is used to verify that the supplier has thoroughly evaluated and analyzed the total manufacturing or assembly process, from start to finish, for all possible causes of variation (i.e. machines, materials, methods, etc.) and has organized the process in such a way as to reduce or eliminate the effect these variations will have on the overall quality system.
The purpose of this record is to determine if the production process will produce product that meets the Customer's requirements. This includes both the raw data (data points) and the results (e.g. CPK, PPK, CP).
Westport design records (Drawings) will be sent to the supplier.
Suppliers must submit a ballooned copy of the Drawing that corresponds to the Dimensional, Material, and Performance Results. The Drawing must be the official Westport engineering released design record. The PPAP must meet all Drawing requirements to be considered for approval.
This is the “Supplier Request for Drawing Change” (SRDC) for the change and the Westport approval. This record provides history for the customer on the specific reasons for the changes.
Where specified by Westport, the organization shall have evidence of customer engineering approval including approval for parts, tooling, product or processes.
Applicable only when the supplier has design responsibility.
A tool used when designing a component, system, process, etc. to ensure, to the extent possible, that all potential failure modes (design related) and their associated causes/mechanisms have been considered and addressed.
To aid in the manufacture of quality products according to customer requirements, a structured approach must be used for the design, selection, and implementation of value-added control methods for the total system. It provides a written summary description of the systems used in minimizing process and product variation.
The purpose of this record is to verify that the gauge (U.S.: gage) or measurement system is capable of accurately assessing the quality of the parts.
Corrective action is necessary for all rejectable items.
This record is used to verify that the parts meet all of the dimensional requirements called out on the Drawing and Control Plan.
This record is used to verify that the parts meet all of the Material and/or Performance requirements/specifications called out on the Drawing and Control Plan.
The purpose of this record is to verify that the supplier has used an Accredited Laboratory or Testing Facility to perform all Material, Functional, and Performance testing called out on the Drawing and Control Plan.
For Appearance Items only
Submitted with PPAP and sample parts for the customer to sign, verifying the parts meet all aesthetic criteria.
Sample parts are submitted for appearance and functional evaluation.
The supplier shall retain a master sample for the same period as the production part approval records or
The master sample shall be identified as such, and shall show the Westport approval date on the sample. The supplier shall retain a master sample for each position of a multiple cavity die, mould, tool or pattern, or production process unless otherwise specified by Westport.
If requested by Westport, the supplier must submit with the PPAP submission any part-specific assembly or component checking aid.
The supplier shall certify that all aspects of the checking aid agree with part dimensional requirements. The supplier shall document all released engineering design changes that have been incorporated in the checking aid at the time of submission. The supplier shall provide for preventive maintenance of any checking aids for the life of the part.
Measurement System Analysis Studies (e.g. Gage R&R, accuracy, bias, linearity, stability) shall be conducted in compliance with Westport requirements (see # 8).
The supplier shall have records of compliance to all applicable Westport specific requirements. For bulk materials, applicable Westport requirements shall be documented on the Bulk Materials Requirements Checklist.
This record is to clearly state to the Customer the reason for your submission.
Take special note of the following:
The checklist indicates the elements required by Westport for the Production Part Approval Process.
R = The element is performed and evidence of the activity is retained and must be made available upon request, however this documentation is not included in the initial submission.
S = The element is performed and evidence of the activity is required as part of the initial submission.
Each submission element is described in detail below. Westport has outlined specific requirements for each element.
Templates have been included for your use. These are AIAG (Automotive Industry Action Group) standard templates. Manuals relating to these activities are available through AIAG website at www.aiag.org. If your organization uses non AIAG standard templates for these activities, please forward a blank copy to Westport for approval prior to proceeding with PPAP activities.
The Part Submission Warrant is required for each submission and must be completed and forwarded with PPAP package.
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