FORD SCCAF is a form used in the process of Special Characteristics selection, identification and overseeing – it includes data from DFMEA, PFMEA and Control Plan.
Thanks to engagement of key functions (Ford PD, STA, Supplier) on early phase of project, it allows to reduce the risk associated with low quality (0km claims, warranty returns, field service actions etc.)
FORD SCCAF – what is its function
It is mandatory for both design-responsible and built-to-print suppliers. The requirement itself is coming from Customer Specific Requirements to IATF16949 – 8.3.2.1 “Design and development planning – supplemental” and Ford specific requirements to PPAP. The document needs to be signed by Ford D&R (Design & Release) Engineer, supplier’s Quality Manager and STA (if requested).
When SCCAF is required?
- There is at least one YS/YC characteristic in DFMEA,
- Each manufacturing location needs to have its own SCCAF signed (even if the same part is manufactured in several locations),
- Re-sourcing of component even if it retains the same Part Number
- Change of manufacturing location even if it retains the same Part Number
New SCCAF is not required for Carry-Over components used in past programs what would be manufactured by Carry-Over supplier and location. In the rare case no Special Characteristic has been identified, empty SCCAF should be signed-off with remark “No characteristics identified”.
Figure 1. FORD SCCAF development – V1 first finding, V2 possible update of the document
Special Characteristics used in FORD SCCAF
Examples of characteristics used in SCCAF:
- Dimension,
- Shape,
- Position,
- Hardness,
- Material coating,
- Roughness
All characteristics included in the SCCAF must be measurable.
Examples of characteristics which should not be used in the SCCAF:
- Characteristics not measurable or controllable in ongoing production ex. DV and durability testing
- Manufacturing errors like Drop down
- Periodic tests, ex. Requalification tests, these should be included in Engineering Specification and cascaded down to Control Plan
APQP Evidence workbook
wykonuję się bez względu na lokalizację charakterystyki w łańcuchu dostaw (od Tier 1 do Tier n).
Each Special Characteristic identified in the SCCAF should demonstrate capable measurement system and acceptable process capability. Data should be recorded in “APQP/PPAP Evidence Workbook”.
Capability demonstration is done regardless of location in supply chain (from Tier 1 to Tier n).
Detailed information on MSA and process capability can be found in AIAG MSA manual.
Requirements for gauge capability are following (Gauge R&R – %SV and %Tolerance):
- <10% – acceptable
- >10% -30% – conditionally acceptable
- >30% – unacceptable
Required process capability is Ppk > 1,67 for initial (PPAP phase 1 and 2) and final (PPAP phase 3) process capability study.
Łukasz Matuszczak
