PPAP Process
The PPAP Process ensures the supplier is capable of producing parts that meet all requirements
What is the Production Part Approval Process (PPAP) and What Does It Entail?
PPAP, or Production Part Approval Process, is a standardized method used in manufacturing to ensure that suppliers can consistently produce parts meeting customer specifications. Originally developed for the automotive industry, it is now widely applied in aerospace, electronics, and industrial manufacturing. Understanding what is PPAP in manufacturing is essential for businesses seeking to maintain consistent quality and compliance across their supply chains. The process validates that a supplier’s production system can reliably produce components of the required quality before full-scale production begins.
At its core, PPAP provides documented evidence that a supplier understands the customer’s requirements and has established a repeatable, controlled process to meet them. This is critical for preventing defects, reducing rework, and ensuring consistent product quality.
The PPAP process is structured around 18 key elements, such as design records, authorized engineering changes, control plans, process flow diagrams, dimensional inspection results, and material certifications. Submissions are classified into five levels, depending on the depth of documentation and customer involvement. By following these requirements, manufacturers and suppliers can confirm that a production process is capable of meeting both technical and quality expectations.
Why PPAP is Important
PPAP is essential for several reasons:
Quality Assurance & Reproducibility: It ensures that parts produced by the supplier meet the required standards under normal production conditions, reducing the risk of defective components reaching the customer.
Clear Communication & Understanding: It enables suppliers to fully grasp product specifications, tolerances, and customer expectations, minimizing misunderstandings and errors.
Documentation & Compliance: PPAP provides both supplier and customer with formal, agreed-upon documentation of process capability and part quality, which is crucial for audits, regulatory compliance, and continuous improvement.
By implementing PPAP effectively, manufacturers can detect issues early, avoid costly recalls or rework, and establish a reliable and repeatable production process. This not only saves time and costs but also strengthens the supplier-customer relationship and builds trust in long-term production reliability.
In today’s competitive manufacturing environment, where outsourcing and global supply chains are common, knowing what is PPAP in manufacturing and applying it properly serves as a critical tool to maintain high-quality standards, accelerate time-to-market, and ensure that every part delivered is correct the first time.
What is the Purpose of the Production Part Approval Process (PPAP)?
The main purpose of the PPAP is to ensure that the supplier completely understands the customer’s design and to demonstrate that the supplier can produce the component or parts as required by the customer consistently.
Q1: Why Perform PPAP?
It is important to carry out this process as it ensures that the supplier is aware of the requirements of the client. It allows the client to become familiar with the quality of the product that will be produced and the process involved in making the same. and The PPAP demonstrates that the production process can be trusted to repeatedly produce products of the quality that the client desires.
It also facilitates an understanding between the supplier and the customer that the product will meet the required specification and design.
Please note the PPAP allows changes to be made which are in agreement or accordance with the client’s approval and importantly helps to prevent conflicts after the contract.
Q2: When is a PPAP Process required?
The PPAP Process may be required for several reasons such as when new parts are being added to the product when changes are being made to the product, the tools being used, and the sub-suppliers, or to the process of production.
If there is an interruption to the production process which exceeds twelve (12) months a PPAP may also be required. The customer can also require that the supplier perform a PPAP if a serious defect is found in the production process or product.
Q3: When to Perform PPAP Process?
The Production Part Approval Process (PPAP Process) should be performed whenever a new part is being added to the processor whenever a change is being made to an existing part. A customer can also ask that one be done at any point during the product’s lifetime.
As a result, suppliers must ensure that they have a system that is so designed to make and document the various requirements for the PPAP even in cases where one has not been requested.
Q4: How to Perform the PPAP Process?
In performing the PPAP, some parts are manufactured using the tools, procedures, facility, personnel and all other features which are expected to be used in the actual production. The number of parts that are normally made is set. The sample pieces are then analyzed in different ways to ensure that the manufacturing process is in agreement with the customer’s request.
Q5:Who is Responsible for PPAP?
The supplier is primarily responsible for the Production Part Approval Process (PPAP). Suppliers prepare and submit the PPAP package to demonstrate that their parts meet all customer specifications, requirements, and functional expectations. This includes documenting design records, material certifications, process flow diagrams, control plans, and inspection results to show that the production process can consistently deliver high-quality parts.
Although suppliers lead the process, it is carried out in close collaboration with the manufacturer’s quality or engineering team, who reviews and approves the PPAP submission. Quality engineers often facilitate communication between supplier and customer to ensure compliance with production part approval process standards. Once approved, the supplier is authorized to begin mass production; if not, corrections must be made and the package resubmitted.
In short, suppliers prepare and maintain the PPAP, manufacturers review and approve it, and quality engineers ensure compliance and smooth communication, creating a reliable system for consistent part quality.
Schedule PPAP Consultation
What are the 5 PPAP Submission Levels?
- Level 1 – Part Submission Warrant (PSW) which is submitted only to the customer
- Level 2 – PSW which has samples of the product and limiting supporting data
- Level 3 – PSW with a product sample and the complete supporting data
- Level 4 – PSW and any other requirements based on what the customer desires.
- Level 5 – PSW with product samples, all of the supporting data for evaluation at the manufacturing location of the supplier.
What are the Required PPAP Elements?
What are the 18 documents of PPAP? As mentioned before there are 18 elements that make up the PPAP and these PPAP elements are: Design records. Engineering change documents. Customer engineering approval.
01
Design Records
This is a drawing of the part being designed. It is normally supplied by the customer with the purchase order. This drawing is very detailed with including specifications and any information relevant to the part being produced. This must be included to ensure that the supplier and customer are both discussing the same product.
02
Engineering Change Documentation
This is also called the Supplier Product Engineering Change Notice (SPCN) and details any changes that are being made to the product or the process. As a result, it is only required when a change is being made.
03
Customer Engineering Approval
This approval involves a trial run with the part that is produced and is not always required. However, when required a ‘temporary deviation’ is needed to facilitate submission of the parts to the customer before the approval of the PPAP.
04
Design Failure Mode and Effect Analysis (DFMEA)
This analysis involves looking at the design of the part or product and assesses the likelihood of it failing and the effect that this would have on the customer or product. It allows for changes to be made which can possible prevent or lessen the likelihood of these failures.
05
Process Flow Diagrams
The graphical representation of the steps and processes involved in manufacturing a product. These diagrams typically outline all the stages of production from start to the components involved.
06
Process Failure Mode and Effects Analysis (PFMEA)
This element evaluates the various steps in the process of production to identify any potential risk to the quality of the product. The controls implemented are then documented.
07
Control Plan
This results from the PFMEA and provides details on the various inspection methods which are in place to ensure that there is consistent delivery of products which meet the customer’s requirement.
08
Measurement System Analysis (MSA)
This is a study that incorporates the Gage Repeatability and Reproducibility (GR&R) study on the equipment used for measurement during the control checks on quality and assembly.
09
Dimensional Results
This demonstrates if the sample product passed or failed the dimension test based on the original requirement as laid out on the drawing of the part.
10
Records of Material or Performance Tests
The Design Verification Plan and Report (DVP&R) which is a summary of the entire validation test carried out on the product should be included in this element. Every test carried out along with the results and the method is to be stated.
11
Initial Process Studies – Statistical Process Control (SPC)
This study serves to illustrate that the critical processes are stable, operating close to the nominal value that is intended and shows normal variation. It normally includes the Statistical Process Control.
12
Qualified Laboratory Documentation
This is made up of the certifications for the various labs that were used in validating the part. The labs could have been in-house or contracted off-site.
13
Appearance Approval Report
This is only necessary in cases where the part will contribute to the appearance of the product. The report serves to show that the customer has reviewed the final product, and it has been found to meet the required design.
14
Sample Production Parts
A sample of the part that is produced is normally sent for approval to the customer once development is complete. This part is then stored at either the suppliers’ or customer’s facility. This element of the PPAP carries a picture of the part along with information as to where the part is being stored.
15
Master Sample
This is the final sample of the part that the customer will inspect and approve. It functions as a benchmark for comparison with other parts that will be produced should the question of quality arise.
16
Checking Aids
This is a list which details all the tools that were used to inspect or test the part.
17
Records of Compliance with Customer Specific Requirements
This entails any special requirements that the customer may have.
18
Part Submission Warrant (PSW)
This is a summary of the PPAP that is being submitted.
Why Choose Welle Inspection for PPAP Services
At Welle Inspection, we provide tailored PPAP services to help suppliers and manufacturers ensure that every part meets strict quality standards. Our team works closely with clients to verify that PPAP in manufacturing consistently produces reliable and precise components, reducing defects and rework while maintaining a robust PPAP quality process.
Our experienced technicians handle inspections at multiple stages of the PPAP procedure, ensuring compliance with all required PPAP elements and PPAP levels. By leveraging our expertise in PPAP manufacturing, companies can detect potential issues early, maintain thorough documentation for audits, and meet customer expectations with confidence throughout the production part approval workflow.
With fast turnaround times and a focus on efficiency, Welle Inspection helps businesses save time and costs while improving supplier credibility and product consistency. Choosing our services means partnering with a team committed to accuracy, reliability, and long-term quality assurance across every stage of the PPAP process.
